CN110429459A - A kind of fiber amplifier - Google Patents
A kind of fiber amplifier Download PDFInfo
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- CN110429459A CN110429459A CN201910700054.1A CN201910700054A CN110429459A CN 110429459 A CN110429459 A CN 110429459A CN 201910700054 A CN201910700054 A CN 201910700054A CN 110429459 A CN110429459 A CN 110429459A
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- light
- collimator
- gain fibre
- signal light
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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Abstract
The embodiment of the present invention provides a kind of fiber amplifier, comprising: seed source；First single mode collimator；Pumping source；Multimode collimator；And amplification optical path；Amplification optical path includes the optical amplification unit of at least one level；Optical amplification unit includes wavelength division multiplexer, the first gain fibre collimator, gain fibre and optical fiber output structure；Wherein, wavelength division multiplexer is used to carry out pump light to be used as the same level pump light after at least partly reflecting, and allows to synthesize the first light beam with the same level pump light after signal light transmission and be projected to the first gain fibre collimator；The first covering and the second covering that gain fibre includes fibre core and is successively coated on outside fibre core；First gain fibre collimator for being converged to the first light beam so that the convergent point of signal light be located at the incident end face of gain fibre before, the convergent point of pump light is located at after the incident end face of gain fibre.The embodiment of the present invention provides a kind of fiber amplifier, to realize the miniaturization of fiber amplifier.
Description
Technical field
The present embodiments relate to optical communication technology more particularly to a kind of fiber amplifiers.
Background technique
Various fiber amplifiers, such as EDFA Erbium-Doped Fiber Amplifier (EDFAs) and distributed raman amplifier (DRAs)
It is the device generally used in optical communication system.Fiber amplifier has become the key equipment in optical fiber telecommunications system.Light
Fiber amplifier can effective compensation signal light decay caused by the long distance transmission and partial wave, greatly pushed fiber optic communication system
The development of system.
Pump light and signal light are combined into gain light using wavelength division multiplexer in traditional fiber amplifier
In fine (such as bait is fine).Bait fibre includes fibre core and the fibre cladding and surrounding layer that are coated on outside fibre core.Wavelength division multiplexer needs
So that signal light is entered fibre core and pump light is made to enter fibre cladding.Existing way is the technique side using fused biconical taper
Method is realized.This implementation method needs biggish space.
Summary of the invention
The embodiment of the present invention provides a kind of fiber amplifier, to realize the miniaturization of fiber amplifier.
The embodiment of the present invention provides a kind of fiber amplifier, comprising:
Seed source emits signal light；
First single mode collimator is connect by the first transmission fiber with the seed source, for the first transmission light
The signal light that fibre transmission comes is projected after being collimated into amplification optical path；
Pumping source emits pump light；The pump light has the wavelength different from the signal light；
Multimode collimator is connect by the second transmission fiber with the pumping source, for passing to second transmission fiber
Defeated next pump light is projected in the amplification optical path after being collimated；And
The amplification optical path；The amplification optical path includes the optical amplification unit of at least one level；
The optical amplification unit includes wavelength division multiplexer, the first gain fibre collimator, gain fibre and optical fiber output
Structure；Wherein, the wavelength division multiplexer is used to carry out the pump light to be used as the same level pump light after at least partly reflecting, and permits
Perhaps the first light beam, which is synthesized, with the same level pump light after the described signal light transmission is projected to the first gain fibre collimator；
The first covering and the second covering that the gain fibre includes fibre core and is successively coated on outside the fibre core；Described first increases
Beneficial optical fiber collimator is for converging first light beam, so that the convergent point of the signal light is located at the gain light
Before fine incident end face, the convergent point of the pump light be located at after the incident end face of the gain fibre so that institute
It states signal light and enters the fibre core, the pump light enters first covering to put to the signal light in fibre core
Greatly；The optical fiber output structure is for exporting the amplified signal light of gain fibre.
Optionally, there is the first light when the signal light is projected to the wavelength division multiplexer by the first single mode collimator
Spot；The multimode collimator has the second hot spot when the pump light is projected to the wavelength division multiplexer；First hot spot
Less than second hot spot.
It optionally, further include the first reflecting mirror；First reflecting mirror is set to the first single mode collimator and described
Between wavelength division multiplexer or first reflecting mirror is set between the multimode collimator and the wavelength division multiplexer, with
The signal light or the pump light are reflected so that it is projected on the wavelength division multiplexer.
It optionally, further include the first isolation being set between the first single mode collimator and the wavelength division multiplexer
Device, and it is set to the second isolator of the output end of the optical fiber output structure.
It optionally, further include the first narrow band filter for being set to the output end of the optical fiber output structure；Described first
Narrow band filter is for being filtered amplified signal light, to eliminate the spontaneous emission light being amplified.
It optionally, further include the first optical splitter and the first detector for being set to the output end of the optical fiber output structure；
The optical fiber output structure is the second gain fibre collimator；The second gain fibre collimator is for collimating the gain light
The amplified signal light of fine outgoing end face outgoing；It is separate that first optical splitter is located at the second gain fibre collimator
The outgoing end face side of the gain fibre, for separating a branch of detection light from the signal light to first detector.
Optionally, the amplification optical path includes at least two-stage optical amplification unit；The fiber amplifier further includes being set to
Connection component between adjacent two-stage optical amplification unit；The connection component includes third transmission fiber and is set to described
Second single mode collimator of the input terminal of three transmission fibers, be set to the third transmission fiber output end third single module quasi
Straight device；The second single mode collimator is used to the signal light collimation of the optical fiber output structure output of previous stage entering third and transmit
It is transmitted in optical fiber, and is projected to the wavelength division multiplexer of next stage after collimating by the third single mode collimator to it
In；The wavelength division multiplexer of every level-one is used to carry out part reflection to the pump light that projection comes to be used as the same level pump light, and carry out portion
Divide the pump light after transmission as subsequent optical amplification unit.
Optionally, the wavelength division multiplexer includes functional surfaces；The functional surfaces and incident signal light and pump light at
45 degree, and it is projected to the signal light of the functional surfaces and pump light is mutually perpendicular to.
It optionally, further include the second reflecting mirror；Light of second reflecting mirror between two neighboring optical amplification unit
On the road；Second reflecting mirror is used to reflect so that it is projected to the signal light that the transmission of previous stage optical amplification unit comes
On the wavelength division multiplexer of rear stage.
Optionally, further include adjustable attenuator, be set in the optical path that the signal light passes through, for the defeated of signal light
Power is adjusted out.
The embodiment of the present invention provides a kind of fiber amplifier, including the first single mode collimator, multimode collimator, the first gain
Signal light is projected on wavelength division multiplexer by optical fiber collimator and gain fibre by the first single mode collimator, and utilizes multimode
Pump light is projected on wavelength division multiplexer by collimator.Wavelength division multiplexer is used to carry out part reflection to pump light, and allows institute
It after some signal lights pass through, is projected in the first gain fibre collimator, the first gain fibre collimator can throw signal light
It is incident upon in the fibre core of gain fibre, by the amplification in the first covering for pumping light projection gain fibre, with realization to signal light.On
Fiber amplifier is stated, space optical transmission is realized using collimator and wavelength division multiplexer combination, to realize under pure optical path
Signal light amplification is advantageously implemented the miniaturization of EDFA, also, realizes signal light and pump by the first gain fibre collimator
The transmission of Pu light, without being realized as is conventional using the process of fused biconical taper, so as to simplify technique
Process reduces product size.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of fiber amplifier provided in an embodiment of the present invention；
Fig. 2 is the operation principle schematic diagram of the first gain fibre collimator provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of gain fibre provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of wavelength division multiplexer provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Fig. 1 is a kind of structural schematic diagram of fiber amplifier provided in an embodiment of the present invention, and Fig. 2 mentions for the embodiment of the present invention
The operation principle schematic diagram of the first gain fibre collimator supplied, Fig. 3 are the structure of gain fibre provided in an embodiment of the present invention
Schematic diagram, with reference to Fig. 1, Fig. 2 and Fig. 3, fiber amplifier includes seed source 1, pumping source 5, the first single mode collimator 2, multimode standard
Straight device 6 and amplification optical path.Seed source 1 emits signal light.First single mode collimator 2 passes through the first transmission fiber 261 and seed source 1
Connection, the signal light for coming to the transmission of the first transmission fiber 261 are projected after collimating into amplification optical path.Pumping source 5 is sent out
Penetrate pump light.Pump light has the wavelength different from signal light.Multimode collimator 6 passes through the second transmission fiber 262 and pumping source 5
Connection, the pump light for coming to the transmission of the second transmission fiber 262 are projected in amplification optical path after collimating.Amplify optical path packet
Include the optical amplification unit of at least one level.Optical amplification unit includes wavelength division multiplexer 4, the first gain fibre collimator 7, gain fibre
8 and optical fiber output structure.Wherein, wavelength division multiplexer 4 is used to carry out pump light to pump after at least partly reflecting as the same level
Light, and allow to synthesize the first light beam with the same level pump light after signal light transmission and be projected to the first gain fibre collimator 7.Gain
Optical fiber 8 includes fibre core 811 and the first covering 812 and the second covering 812 that are successively coated on outside fibre core 811；First gain
Optical fiber collimator 7 is for converging the first light beam, so that the convergent point of signal light is located at the incident end face of gain fibre 8
Before, the convergent point of pump light is located at after the incident end face of gain fibre 8, so that signal light enters fibre core 811, pump
Pu light enters the first covering 812 to amplify to the signal light in fibre core 811；Optical fiber output structure is used for gain fibre
8 amplified signal lights are exported.
For clarity, the wavelength division multiplexer 4 in first order optical amplification unit is known as the first wavelength division multiplexer 40, it will
Gain fibre 8 in first order optical amplification unit is known as the first gain fibre 81, and the optical fiber in first order optical amplification unit is defeated
Structure is known as the first optical fiber output structure out.
Illustratively, with reference to Fig. 1, Fig. 2 and Fig. 3, the first wavelength division multiplexer 40 includes the first functional surfaces 410, through first
The signal light of functional surfaces 410 is the first light beam with the pumping combiner reflected by the first functional surfaces 410.Through the first gain fibre standard
The first light beam that straight device 7 converges projects the incident end face of the first gain fibre 81, and signal light is collimated by the first gain fibre
The convergent point and pump light that the convergence of device 7 is formed are located at the first gain by the convergent point that the convergence of the first gain fibre collimator 7 is formed
The opposite sides of the incident end face of optical fiber 81.
For clarity, in the operation principle schematic diagram of the present invention the first gain fibre collimator 7 shown in Fig. 2,
Signal light is marked with " L1 ", pump light is marked with " L2 ".With reference to Fig. 2, the first gain fibre collimator 7 is utilized
Multimode pump light L2 can be projected to by the different feature in the convergent point position that single mode signal light L1 and multimode pump light L2 is formed
In first covering 812, and single mode signal light L1 is projected in fibre core 811.Optionally, the first single mode collimator 2 is by signal light
There is the first hot spot when being projected to wavelength division multiplexer 4；Have the when pump light is projected to wavelength division multiplexer 4 by multimode collimator 6
Two hot spots, signal light L1 converge the first hot spot to be formed and converge the second hot spot to be formed, signal light L1 convergence less than pump light L2
The distance between the convergent point of formation and the first gain fibre collimator 7 are less than pump light L2 and converge the convergent point to be formed and first
The distance between gain fibre collimator 7.The incident end face of first gain fibre 81 is located at signal light by the first gain fibre standard
Between the convergent point that the straight convergence of device 7 convergent point formed and pump light are formed by the convergence of the first gain fibre collimator 7.First increases
Beneficial optical fiber collimator 7 converges signal light L1 before the incident end face of the first gain fibre 8, and the signal light L1 after convergence continues
Emit forward, and enters in fibre core 811.For pump light L2, pump light L2 converges the convergent point to be formed and increases first
After the incident end face of beneficial optical fiber 8, therefore pump light L2 convergence is projected to the first gain fibre by the first gain fibre collimator 7
There is no convergence completely when 8 incident end face, there is biggish facula area, so as to enter fibre core 811 and the first packet
In layer 812.Since fibre core 811 is smaller with respect to area for the first covering 812, pump light L2 only has small part that can enter
In fibre core 811, the major part of pump light L2 can be entered in the first covering 812.
The embodiment of the present invention provides a kind of fiber amplifier, including the first gain fibre collimator and gain fibre, passes through
Signal light can be projected in the fibre core of gain fibre by the first gain fibre collimator, will pump the of light projection gain fibre
In one covering, without being realized as is conventional using the process of fused biconical taper, so as to simplify technique stream
Journey reduces product size.
Illustratively, with reference to Fig. 1, gain fibre 8 can be rare earth-doped fiber amplifier, such as Erbium-doped fiber amplifier
Device or ytterbium doped optical fiber amplifier etc..Wavelength division multiplexer 4 can be wavelength division multiplexer diaphragm (also referred to as WDM diaphragm).Seed source 1
The wavelength of the signal light of transmitting is 1550nm, and the wavelength for the pump light that pumping source 5 emits is 980nm.
Illustratively, with reference to Fig. 1, seed source 1 is connect with the first single mode collimator 2 by 261 optical path of the first transmission fiber,
The signal light that seed source 1 emits projects in the first transmission fiber 261, and it is single then to project first by the first transmission fiber 261
Mould collimator 2, and the collimation Jing Guo the first single mode collimator 2 becomes directional light, directional light projects the first wavelength division multiplexer 40
The first functional surfaces 410, and project the first gain fibre collimator 7 through the first functional surfaces 410.Multimode collimator 6 and
One single mode collimator 2 is located at the not ipsilateral of the first wavelength division multiplexer 40, and the optical axis direction of multimode collimator 6 can be with the first single mode
The optical axis direction of collimator 2 is vertical.Pumping source 5 is connect with multimode collimator 6 by 262 optical path of the second transmission fiber, pumping source 5
The pump light of transmitting projects in the second transmission fiber 262, then projects multimode collimator 6 by the second transmission fiber 262, and
Collimation by multimode collimator 6 becomes directional light, and directional light projects the first functional surfaces 410 of the first wavelength division multiplexer 40,
And the first gain fibre collimator 7 is reflexed to by the first functional surfaces 410.
Fig. 4 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention, with reference to Fig. 4, fiber amplifier
Device further includes the first reflecting mirror 27.First reflecting mirror 27 is set to multimode collimator 6 and wavelength division multiplexer 4, and (i.e. the first wavelength-division is multiple
With device 40) between, to be reflected signal light or pump light so that it is projected on wavelength division multiplexer 4.In other realities
It applies in mode, the first reflecting mirror 27 can also be set to the first single mode collimator 2 and (i.e. the first wavelength-division multiplex of wavelength division multiplexer 4
Device 40) between.
Illustratively, with reference to Fig. 4, collimation of the signal light that seed source 1 emits Jing Guo the first single mode collimator 2 becomes parallel
Light, directional light projects the first functional surfaces 410 of the first wavelength division multiplexer 40, and projects first through the first functional surfaces 410
Gain fibre collimator 7.The optical axis direction of multimode collimator 6 can be parallel with the optical axis direction of the first single mode collimator 2.Pumping
The pump light that source 5 emits projects multimode collimator 6, and the collimation Jing Guo multimode collimator 6 becomes directional light, parallel light projection
The first functional surfaces 410 of the first wavelength division multiplexer 40 are reflexed to the first reflecting mirror 27 and by the first reflecting mirror 27, then by
One functional surfaces 410 reflex to the first gain fibre collimator 7.
Optionally, with reference to Fig. 1, fiber amplifier further include further include be set to optical fiber output structure output end first
Narrow band filter 13, the first narrow band filter 13 are amplified for being filtered to amplified signal light with elimination
Spontaneous emission light.
Illustratively, with reference to Fig. 1, optical fiber output structure is the second gain fibre collimator 9, the second gain fibre collimator
Spatial light is formed after the amplified signal light of the 9 outgoing end face outgoing for collimating the first gain fibre 81 to transmit outward, the
One narrow band filter 13 is located at outgoing end face side of the second gain fibre collimator 9 far from the first gain fibre 81.First increases
It is narrow that the amplified signal light of the outgoing end face outgoing of beneficial optical fiber 81 is projected to first after the second gain fibre collimator 9 collimation
Band filter 13.
Illustratively, with reference to Fig. 1, the optical axis of the optical axis of the first gain fibre collimator 7 and the second gain fibre collimator 9
In parallel, and the second gain fibre collimator 9 is located at the first gain fibre collimator 7 far from 40 side of the first wavelength division multiplexer.The
One narrow band filter 13 is located at the second gain fibre collimator 9 far from 40 side of the first wavelength division multiplexer.By the first gain light
Fine 81 amplified signal lights are projected to the second gain fibre collimator 9 by the outgoing end face of the first gain fibre 81, and by the
Two gain fibre collimators 9 collimation is parallel light emergence.
Optionally, with reference to Fig. 1, fiber amplifier further includes being set between the first single mode collimator 2 and wavelength division multiplexer 4
The first isolator 3, and be set to the second isolator 10 of the output end of optical fiber output structure.
Illustratively, with reference to Fig. 1, optical fiber output structure is the second gain fibre collimator 9, the second gain fibre collimator
The amplified signal light of the 9 outgoing end face outgoing for collimating the first gain fibre 81.First isolator 3 is located at the first single mode
Between collimator 2 and the first wavelength division multiplexer 40, the second isolator 10 is located at the second gain fibre collimator 9 far from the first gain
The outgoing end face side of optical fiber 9.First isolator 3 and the second isolator 10 are used to ensure that the light in optical path to carry out one way propagation,
The interference for avoiding reflection from may cause protects device from coming from the possible retrodirective reflection of lower section, and the light in optical path is inhibited to return
Light echo source.Such as first light that prevents the first wavelength division multiplexer 40 to reflect towards the first single mode collimator 2 of isolator 3.The
One isolator 3 and the second isolator 10 are as small as possible using free space type isolator size.Wherein, lower section is referred to along light
By the light path part after the device on the direction of propagation.
Optionally, with reference to Fig. 1, fiber amplifier further includes the first optical splitter 11 and the first detector 12, optical fiber output knot
Structure is the second gain fibre collimator 9, and the outgoing end face that the second gain fibre collimator 9 is used to collimate the first gain fibre 81 goes out
The amplified signal light penetrated.First optical splitter 11 is located at the second gain fibre collimator 9, and far from gain fibre 8, (i.e. first increases
Beneficial optical fiber 81) outgoing end face side, for separating a branch of detection light from signal light to the first detector 12.First detector
12 for detecting the detection light, to determine the intensity of the reflected light in optical path, avoids damaging upper section device due to reflected light
The phenomenon that part, occurs, and while avoiding reflected light too strong has an impact the optical path of forward-propagating.Wherein, upper section is referred to along light
The light path part before the device is reached on the direction of propagation.
Fig. 5 is the structural schematic diagram of wavelength division multiplexer provided in an embodiment of the present invention, and with reference to Fig. 5, wavelength division multiplexer 4 includes
First face S1, the second face S2, third face S3, fourth face S4 and functional surfaces 41, the first face S1 is opposite with third face S3, the second face
S2 is opposite with fourth face S4, and the first face S1 and the second face S2 are located at the same side of functional surfaces 41.By the signal of fourth face S4 incidence
Light all penetrates 41 to the second face S2 of functional surfaces, at least partly reflexes to by functional surfaces 41 by the pump light of the first face S1 incidence
Two face S2.
Illustratively, with reference to Fig. 5, wherein the first face S1 and third face S3 is it is required that multimode pump light all penetrates, to the greatest extent
Amount reflects less.The face fourth face S4 is reflected less as far as possible then it is required that single mode signal light passes through completely.Second face S2 is then
It is required that single mode signal light and multimode pump light can pass through completely.Note that passing through finger completely described in the present invention
It is that ideally, the diaphragm of high transmittance can be used for example in actual products.First functional surfaces 410 are it is required that single mode
Signal light passes through completely, and is used as level-one pump light after at least partly (such as 30%) of multimode pump light is reflected.
Fig. 6 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention, with reference to Fig. 3 and Fig. 6, amplification
Optical path includes at least two-stage optical amplification unit.Fiber amplifier further includes the connection being set between adjacent two-stage optical amplification unit
Component.Connection component include third transmission fiber 263 and be set to third transmission fiber 263 input terminal the second single module quasi
Straight device 14, be set to third transmission fiber 263 output end third single mode collimator 15.Second single mode collimator 14 is used for will
The signal light collimation of the optical fiber output structure output of previous stage, which enters in third transmission fiber 263, to be transmitted, and passes through third
Single mode collimator 15 is projected in the wavelength division multiplexer 4 of next stage after collimating to it.The wavelength division multiplexer 4 of every level-one is used for
Part reflection is carried out to the next pump light of projection and is used as the same level pump light, and is used as subsequent light amplification list after carrying out fractional transmission
The pump light of member.
Illustratively, with reference to Fig. 6, amplify optical path and include at least two-stage optical amplification unit.First order optical amplification unit includes
First wavelength division multiplexer 40, the first gain fibre collimator 7, the first gain fibre 81 and the first optical fiber output structure (i.e.
Two gain fibre collimators 9).Second level optical amplification unit include the second wavelength division multiplexer 17, third gain fibre collimator 18,
Second gain fibre 19 and the second optical fiber output structure (i.e. the 4th gain fibre collimator 20).Pumping source 5 emits pump light
It is projected to the second wavelength division multiplexer 17 through the part of the first functional surfaces 410, the outgoing end face outgoing of the first gain fibre 81
Amplified signal light is projected to the second wavelength division multiplexer 17.Second wavelength division multiplexer 17 includes the second functional surfaces 171, through the
The signal light of two functional surfaces 171 is the second light beam with the pumping combiner reflected by the second functional surfaces 171.Third gain fibre is quasi-
Straight device 18 is used to converge the second light beam.Third gain fibre collimator 18 can by the second light beam signal light and pumping
Light convergence.The second light beam converged through third gain fibre collimator 18 projects the incident end face of the second gain fibre 19, and
Signal light is converged by the convergent point that the convergence of third gain fibre collimator 18 is formed and pump light by third gain fibre collimator 18
Combinate form at convergent point be located at the second gain fibre 19 incident end face opposite sides so that signal light is incident to fibre core 811
In, it is incident to pump light in fibre core 811 and the first covering 812.Signal light can use pump in the second gain fibre 19
Energy provided by the light of Pu amplifies, and completes second level amplification.
Illustratively, with reference to Fig. 6, the second wavelength division multiplexer 17 can be located at the first wavelength division multiplexer 40 and collimate far from multimode
6 side of device, and the second wavelength division multiplexer 17, the first wavelength division multiplexer 40 and the setting of 6 common optical axis of multimode collimator.In other implementations
In mode, the second wavelength division multiplexer 17 may be located on the first wavelength division multiplexer 40 far from 27 side of the first reflecting mirror.
Illustratively, with reference to Fig. 6, fiber amplifier can also include the third single mode collimator 15 set gradually along optical axis
With third isolator 16.Third single mode collimator 15 is transmitted through third isolator for collimating signal light to form directional light
16.Third isolator 16 is used to ensure that the light in optical path to carry out one way propagation, the interference for avoiding reflection from may cause.Third isolation
Device 16 is located between third single mode collimator 15 and the second wavelength division multiplexer 17.Fiber amplifier can also include along optical axis successively
The 4th gain fibre collimator 20, the 4th isolator 21, the second optical splitter 22, the second narrow band filter 24 and the 4th list being arranged
Mould collimator 25.4th gain fibre collimator 20 is used to collimate the amplified of the outgoing end face outgoing of the second gain fibre 19
Signal light.4th isolator 21 is used to ensure that the light in optical path to carry out one way propagation, the interference for avoiding reflection from may cause.Second
Optical splitter 22 from the signal light for separating a branch of detection light to second detector 23.Second narrow band filter 24 is used
It is filtered in the completion amplified signal light in the second level, to eliminate the spontaneous emission light being amplified, makes an uproar to reduce
Sound.Signal light after the convergence of the 4th single mode collimator 25 can be projected to the 4th transmission fiber 264.In a way of example
In, the signal light after the convergence of the 4th single mode collimator 25 can be exported by the 4th transmission fiber 264 and as final defeated
Light out, final output light have passed through second level amplification.In other embodiments, after the convergence of the 4th single mode collimator 25
Signal light can be exported by the 4th transmission fiber 264 into third level amplification optical path, to realize the signal light amplification of at least three-level.
Illustratively, with reference to Fig. 6, the first functional surfaces 410 are it is required that single mode signal light passes through completely, and multimode is pumped
The part (such as 30%) of light is used as level-one pump light after being reflected, the light of the part (such as 70%) of multimode pump light is saturating
Diode pumping light is used as after penetrating.Second functional surfaces 171 are it is required that single mode signal light passes through completely, and extremely by multimode pump light
Small part is used as diode pumping light after being reflected.In the case where the signal light of final output is the signal light of second level amplification,
Second functional surfaces 171 can be with the whole pump lights of reflected illumination thereon to third gain fibre collimator 18.
Optionally, with reference to Fig. 6,410 place plane of the first functional surfaces is vertical with 171 place plane of the second functional surfaces.
Illustratively, with reference to Fig. 6, the second gain fibre collimator 9, the second isolator 10, the first optical splitter 11, first are narrow
Band filter 13 and the second single mode collimator 14 are sequentially arranged in a row.Third single mode collimator 15, third isolator 16, second
Wavelength division multiplexer 17 and third gain fibre collimator 18 are sequentially arranged into another row.Light the second gain fibre collimator 9,
The direction of propagation in second isolator 10, the first optical splitter 11, the first narrow band filter 13 and the second single mode collimator 14, with light
Line is in third single mode collimator 15, third isolator 16, the second wavelength division multiplexer 17 and third gain fibre collimator 18
The direction of propagation is opposite.In the embodiment of the present invention, by where setting 410 place plane of the first functional surfaces and the second functional surfaces 171
Plane is vertical, so that the second single mode collimator 14 and third single mode collimator 15 is located at the first wavelength division multiplexer 40 and the second wavelength-division multiple
With the same side of 17 line of device, make the second single mode collimator 14 and the neighbouring setting of third single mode collimator 15, to reduce device
The layout difficulty of part, and reduce third transmission fiber 263 between the second single mode collimator 14 and third single mode collimator 15
Use length.
Fig. 7 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention, with reference to Fig. 7, the first function
410 place plane of face is parallel with 171 place plane of the second functional surfaces.Illustratively, light the second gain fibre collimator 9,
The direction of propagation in second isolator 10, the first optical splitter 11, the first narrow band filter 13 and the second single mode collimator 14, with light
Line is in third single mode collimator 15, third isolator 16, the second wavelength division multiplexer 17 and third gain fibre collimator 18
The direction of propagation is identical.
Optionally, with reference to Fig. 1, Fig. 4, Fig. 6 and Fig. 7, wavelength division multiplexer 4 includes functional surfaces 41.Functional surfaces 41 and incidence
Signal light and pump light are projected to the signal light of functional surfaces 41 and pump light is mutually perpendicular at 45 degree.
Illustratively, with reference to Fig. 1, Fig. 4, Fig. 6 and Fig. 7, the first functional surfaces 410 and the incidence of the first wavelength division multiplexer 40
Signal light and pump light are projected to the signal light of the first functional surfaces 410 and pump light is mutually perpendicular at 45 degree.Second wavelength-division
Second functional surfaces 171 of multiplexer 19 and the signal light and pump light of incidence are projected to the second functional surfaces 171 at 45 degree
Signal light and pump light are mutually perpendicular to.
Fig. 8 is the structural schematic diagram of another fiber amplifier provided in an embodiment of the present invention, with reference to Fig. 8, fiber amplifier
Device further includes the second reflecting mirror 28.Second reflecting mirror 28 is in the optical path between two neighboring optical amplification unit.Second reflection
Mirror 28 is used to reflect so that its wavelength-division for being projected to rear stage is multiple the signal light that the transmission of previous stage optical amplification unit comes
With on device 4.
Illustratively, with reference to Fig. 8, the second reflecting mirror 28 is located between third isolator 16 and third single mode collimator 15,
The light that third single mode collimator 15 is emitted is reflexed to third isolator 16 by the second reflecting mirror 28, then light is projected to second
On wavelength division multiplexer 17.In other embodiments, the second reflecting mirror 28 can also be set to the first narrow band filter 13 with
Between second single mode collimator 14, the light that the first narrow band filter 13 is emitted is reflexed to the second single module quasi by the second reflecting mirror 28
Then straight device 14, light are projected to second after third transmission fiber 263, third single mode collimator 15 and third isolator 16
On wavelength division multiplexer 17.
Optionally, since the calorific value of seed source 1 and pumping source 5 is higher, it is therefore desirable to carry out temperature control, for example use
Semiconductor cooler controls its temperature, to prevent temperature fluctuation from impacting to wavelength, it is ensured that seed source 1 and pumping source
5 temperature is constant, and then the wavelength for ensuring to launch is the optical signal of target wavelength.
Optionally, fiber amplifier further includes adjustable attenuator (not shown), and adjustable attenuator is set to signal light
In the optical path of process, it is adjusted for the output power to signal light.Adjustable attenuator for example can be set signal light most
The output end face side of the transmission fiber (such as the 4th transmission fiber 264) of whole outgoing.
Optionally, the optical fiber in various embodiments of the present invention (such as gain fibre 8 and the 4th transmission fiber 264 etc.) can be equal
It is set as polarization maintaining optical fibre, each optical device (such as first wavelength division multiplexer 40 and the first gain fibre collimator 7 etc.) is then arranged
For polarization-maintaining optical device, so that each component all has same polarization state, so that optical energy loss is smaller.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts, be combined with each other and substitutes without departing from protection scope of the present invention.Therefore, although by above embodiments to this
Invention is described in further detail, but the present invention is not limited to the above embodiments only, is not departing from present inventive concept
In the case of, it can also include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of fiber amplifier characterized by comprising
Seed source emits signal light；
First single mode collimator is connect by the first transmission fiber with the seed source, for passing to first transmission fiber
Defeated next signal light is projected after being collimated into amplification optical path；
Pumping source emits pump light；The pump light has the wavelength different from the signal light；
Multimode collimator is connect by the second transmission fiber with the pumping source, for transmitting to second transmission fiber
Pump light collimated after be projected in the amplification optical path；And
The amplification optical path；The amplification optical path includes the optical amplification unit of at least one level；
The optical amplification unit includes wavelength division multiplexer, the first gain fibre collimator, gain fibre and optical fiber output structure；
Wherein, the wavelength division multiplexer is used to carry out the pump light to be used as the same level pump light after at least partly reflecting, and allows institute
It states and synthesizes the first light beam with the same level pump light after signal light transmission and be projected to the first gain fibre collimator；It is described
The first covering and the second covering that gain fibre includes fibre core and is successively coated on outside the fibre core；The first gain light
Fine collimator is for converging first light beam, so that the convergent point of the signal light is located at the gain fibre
Before incident end face, the convergent point of the pump light be located at after the incident end face of the gain fibre so that the letter
Number light enters the fibre core, and the pump light enters first covering to amplify to the signal light in fibre core；Institute
Optical fiber output structure is stated for exporting to the amplified signal light of gain fibre.
2. fiber amplifier according to claim 1, which is characterized in that the first single mode collimator is by the signal light
There is the first hot spot when being projected to the wavelength division multiplexer；The pump light is projected to the wavelength-division and answered by the multimode collimator
With when device have the second hot spot；First hot spot is less than second hot spot.
3. fiber amplifier according to claim 1, which is characterized in that further include the first reflecting mirror；First reflection
Mirror is set between the first single mode collimator and the wavelength division multiplexer or first reflecting mirror be set to it is described more
Between mould collimator and the wavelength division multiplexer, to be reflected the signal light or the pump light so that it is projected
On to the wavelength division multiplexer.
4. fiber amplifier according to claim 1, which is characterized in that further include being set to the first single mode collimator
The first isolator between the wavelength division multiplexer, and it is set to the second isolation of the output end of the optical fiber output structure
Device.
5. fiber amplifier according to claim 1, which is characterized in that further include being set to the optical fiber output structure
First narrow band filter of output end；First narrow band filter is used to be filtered amplified signal light, with
Eliminate the spontaneous emission light being amplified.
6. fiber amplifier according to claim 1, which is characterized in that further include being set to the optical fiber output structure
The first optical splitter and the first detector of output end；The optical fiber output structure is the second gain fibre collimator；Described second
Gain fibre collimator is used to collimate the amplified signal light of the outgoing end face outgoing of the gain fibre；First light splitting
Device is located at outgoing end face side of the second gain fibre collimator far from the gain fibre, for from the signal light
A branch of detection light is separated to first detector.
7. fiber amplifier according to claim 1, which is characterized in that the amplification optical path includes at least two-stage light amplification
Unit；The fiber amplifier further includes the connection component being set between adjacent two-stage optical amplification unit；The connection component
The second single mode collimator including third transmission fiber and the input terminal for being set to the third transmission fiber, be set to it is described
The third single mode collimator of the output end of third transmission fiber；The second single mode collimator is used for the optical fiber output of previous stage
Structure output signal light collimation enter third transmission fiber in is transmitted, and by the third single mode collimator to its into
It is projected in the wavelength division multiplexer of next stage after row collimation；The wavelength division multiplexer of every level-one is used to carry out the pump light that projection comes
Part reflection is used as the same level pump light, and carries out the pump light after fractional transmission as subsequent optical amplification unit.
8. fiber amplifier according to claim 1 or claim 7, which is characterized in that the wavelength division multiplexer includes functional surfaces；Institute
Functional surfaces and incident signal light and pump light are stated at 45 degree, and be projected to the functional surfaces signal light and pump light it is mutual
Vertically.
9. fiber amplifier according to claim 7, which is characterized in that further include the second reflecting mirror；Second reflection
Mirror is in the optical path between two neighboring optical amplification unit；Second reflecting mirror is used to transmit previous stage optical amplification unit
The signal light come is reflected so that it is projected on the wavelength division multiplexer of rear stage.
10. fiber amplifier according to claim 1, which is characterized in that further include adjustable attenuator, be set to the letter
In the optical path that number light passes through, it is adjusted for the output power to signal light.
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| CN201910700054.1A CN110429459A (en) | 2019-07-31 | 2019-07-31 | A kind of fiber amplifier |
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| CN201910700054.1A CN110429459A (en) | 2019-07-31 | 2019-07-31 | A kind of fiber amplifier |
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