CN107039877A - A kind of high stability optical pulse generator - Google Patents
A kind of high stability optical pulse generator Download PDFInfo
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- CN107039877A CN107039877A CN201710492338.7A CN201710492338A CN107039877A CN 107039877 A CN107039877 A CN 107039877A CN 201710492338 A CN201710492338 A CN 201710492338A CN 107039877 A CN107039877 A CN 107039877A
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1109—Active mode locking
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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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
-
- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
A kind of high stability optical pulse generator of the present invention belongs to the technical field of optic communication device, its primary structure includes the Active Mode-locked Fiber Laser resonator being made up of devices such as pump light source (1), wavelength division multiplexer (2), the first photo-coupler (3), Polarization Controllers (4), and the pulse optimization system that the passive mode-locking fiber laser system being made up of devices such as dispersion compensating fiber (23), graphene saturable absorbers (24) and two automatic feedback control rings are constituted.The present invention is using main passive mixed mode-locking technology, laser is exported using photo-detector receiving portion, and the signal of reception is handled using single-chip microcomputer and amplifying circuit, control piezoelectric ceramics realizes that whole system exports the optimization of pulse, it is final whole system is produced stable ultrashort high-speed optical pulse, it is simple to operate and can reach accurate control.
Description
Technical field
It is more particularly to a kind of to be realized using main passive joint mode-locking technique the invention belongs to the technical field of optic communication device
The optical pulse generator of high stability pulse output.
Background technology
The national economic development is rapid, and the information age has arrived, and Fibre Optical Communication Technology has penetrated into various command, control, communications, and informations
In network.Optical fiber laser is the perfect light source of fiber optic communication, has many advantages compared with traditional solid state laser, in recent years
To have obtained extensive research.Mode locked fiber laser in optical fiber laser is the preferable choosing of light-pulse generator in optical communication system
Select.
The common structure of mode locked fiber laser has active mode locking and passive mode-locking fiber laser.Wherein active mode locking light
Fibre laser output pulse width is narrow, frequency chirp is small and frequency-tunable, thus has very big in Ultra-High Speed Optical Communication
Application prospect.
It is Active Mode-locked Fiber Laser system as shown in Figure 2 with immediate prior art of the invention, sinusoidal electricity
Signal function is pressed in lithium niobate (LiNbO3) modulator, modulator will produce periodic phase place change or loss, periodically
Change act on the pulse of resonance cavity circulation, influencing each other between them is so that produce locked mode sequence.LiNbO3Modulation
Device is Polarization-Sensitive, and a Polarization Controller is placed generally before modulator to adjust the light field polarization state of modulator.Center
Wavelength is adjusted by tunable optic filter.
But the spectrum of Active Mode-locked Fiber Laser output laser is narrow, Ultra-short pulse is hardly resulted in, and actively lock
The chamber length of mode fiber laser is general all longer, easily by external influence, causes its less stable.
Passive mode-locking fiber laser is simple in construction, cost is low and reliability is high, is real all-fiber devices, utilizes light
Fine nonlinear effect, can produce most short optical pulse, but the stability of its output pulse recurrence frequency is poor, it is impossible to extraneous
Regulation and control.
In summary, intrinsic shortcoming is individually present in existing actively or passively mode locked fiber laser system at present,
Effectively automatically controlled especially because not taken in existing mode locked fiber laser system so that the stability of output optical pulse
It is poor.
The content of the invention
The technical problem to be solved in the present invention be the shortcoming that overcomes mode locked fiber laser in background technology to exist there is provided
A kind of high stability optical pulse generator using main passive mixed mode-locking technology, to produce stable ultrahigh speed pulse as mesh
's.
Technical scheme is as follows：
A kind of high stability optical pulse generator, its structure has, pump light source 1 and the 980nm ends phase of wavelength division multiplexer 2
Even, the 1550nm ends of wavelength division multiplexer 2 are connected with the input of the first photo-coupler 3；10% output end of the first photo-coupler 3
It is connected with one end of Polarization Controller 4, the other end of Polarization Controller 4 is defeated with the lithium niobate modulator 5 that is driven by microwave source 6
Enter end to be connected；One end of optical fiber of the output end of lithium niobate modulator 5 with being wrapped on the first PZT piezoelectric ceramics 7 is connected；It is described
The other end for the optical fiber being wrapped on the first PZT piezoelectric ceramics 7 be connected with an input of the second photo-coupler 8；Second
Another input of photo-coupler 8 is connected with the input of the first optoisolator 9；The output end of first optoisolator 9 and the
One end of one Er-doped fiber 10 is connected, and the other end of the first Er-doped fiber 10 is connected with the common port of wavelength division multiplexer 2；
Characterized in that, structure also has the input of the 3rd photo-coupler 11 and 90% output end of the first photo-coupler 3
It is connected, 40% output end of the 3rd photo-coupler 11 is connected with the input of the 4th photo-coupler 12, the 3rd photo-coupler 11
60% output end as described high stability optical pulse generator output port；One of 4th photo-coupler 12 is 50% defeated
Go out end with the input of the first photo-detector 13 to be connected, another 50% output end and the input phase of the second photo-detector 18
Even；The output end of first photo-detector 13 is connected with the input of A/D converter 14, the output end of A/D converter 14 with
Single-chip microcomputer 15 is connected, and single-chip microcomputer 15 is connected with the input of D/A converter 16, the output end of D/A converter 16 and first
The input of piezoelectric ceramic actuator 17 is connected, output end and the phase of the first PZT piezoelectric ceramics 7 of the first piezoelectric ceramic actuator 17
Even；The output end of second photo-detector 18 is connected with the input of amplifying circuit 19, the output end of amplifying circuit 19 and the second pressure
The input of electroceramics driver 20 is connected, output end and the phase of the 2nd PZT piezoelectric ceramics 21 of the second piezoelectric ceramic actuator 20
Even, the one end for the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 21 is connected with 50% output end of the second photo-coupler 8,
Another 50% output end of second photo-coupler 8 is connected with the input of the second optoisolator 22, the second optoisolator 22
Output end is connected with one end of dispersion compensating fiber 23, the other end and the graphene saturable absorber 24 of dispersion compensating fiber 23
One end be connected；The other end of graphene saturable absorber 24 is connected with one end of single-mode fiber 25, single-mode fiber 25 it is another
One end is connected with one end of the second Er-doped fiber 26, and the other end of the second Er-doped fiber 26 is wrapped in the 2nd PZT pressures with described
The other end of optical fiber on electroceramics 21 is connected.
Beneficial effect：
1st, the present invention produces the output of high speed ultrashort light pulse using main passive mixing lock technology, can overcome passive mode-locking light
The shortcoming of the uncontrollable output pulse recurrence frequency of fibre laser system and repetition rate stability difference, plays passive mode-locking optical fiber
Optical Maser System can produce the advantage of femtosecond light pulse；The output of Active Mode-locked Fiber Laser system can be overcome steady simultaneously
Qualitative poor shortcoming, mode locked fiber laser system of the taking the initiative output adjustable advantage of repetition rate, produces whole system
Stable ultrashort high-speed optical pulse.
2nd, the present invention controls the length of resonator in the stable Active Mode-locked Fiber Laser of piezoelectric ceramics using feedback signal,
Overcome chamber length to drift about, make system output stable；The piezoelectricity pottery in passive mode-locking fiber laser is controlled using feedback signal simultaneously
Porcelain, makes the light pulse in passive mode-locking fiber laser system more optimize, and whole system is produced stable ultrashort height
Fast light pulse.
3rd, New Two Dimensional material graphene is produced ultrashort high-speed optical pulse by the present invention, based on stone
The saturable absorber of black alkene has that ultrashort recovery time, antibody Monoclonal threshold value are high, bandwidth response wave-length coverage is wide, unsaturation absorbs
Low advantage is lost, femtosecond ultrashort pulse can be produced.
4th, the present invention adds Er-doped fiber in the resonator of passive mode-locking fiber laser, can be to transmitting wherein
Optical signal produce gain amplification, make system export optical pulse energy further increase.
5th, the present invention is simple in construction, and receiving portions output laser are distinguished using two photo-detectors, and using single-chip microcomputer and
Amplifying circuit is handled the signal of reception, and control piezoelectric ceramics realizes that whole system exports the optimization of pulse, simple to operate
And can reach accurate control.
Brief description of the drawings：
Fig. 1 is a kind of theory diagram of high stability optical pulse generator of the present invention.
Fig. 2 is traditional Active Mode-locked Fiber Laser system block diagram.
Embodiment
Below in conjunction with the accompanying drawings, the concrete structure of each several part light path of the present invention is illustrated.In embodiment, the bracket behind component
The preferred parameter of the invention of middle mark, but protection scope of the present invention do not limited by these parameters.
Embodiment 1：The concrete structure of the present invention
The present invention a kind of optical pulse generator structure based on piezoelectric ceramics feedback control as shown in Figure 1, its structure
Have, pump light source 1 (980nm lasers, peak power output is 1W) and wavelength division multiplexer 2 (980/1550nm wavelength division multiplexers)
980nm ends be connected, the 1550nm ends of wavelength division multiplexer 2 and the first photo-coupler 3 (1 × 2 standard single mode photo-coupler, light splitting
Than for 10：90) input is connected；(tail fiber type is mechanically inclined with Polarization Controller 4 for 10% output end of the first photo-coupler 3
Shake controller) one end be connected, its export light pulse continued to run with Active Mode-locked Fiber Laser resonator, the first light
(1 × 2 standard single mode photo-coupler, splitting ratio is 40 to 90% output end of coupler 3 with the 3rd photo-coupler 11：60) input
End is connected；The other end of Polarization Controller 4 and (the vast space Fibre Optical Communication Technology in Shanghai of lithium niobate modulator 5 driven by microwave source 6
The MX-LN-20 light intensity modulators of Co., Ltd) input be connected；The output end of lithium niobate modulator 5 is with being wrapped in first
One end of optical fiber on PZT piezoelectric ceramics 7 is connected；The other end of the described optical fiber being wrapped on the first PZT piezoelectric ceramics 7 with
(2 × 2 standard single mode photo-couplers, splitting ratio is 50 to second photo-coupler 8：50) a input is connected；Second optical coupling
Another input of device 8 is connected with the input of the first optoisolator 9 (1550nm polarization independent optical isolators), the first light every
Make the light pulse unidirectional operation in system from device 9, direction is the clockwise direction of accompanying drawing 1；The output end of first optoisolator 9 with
One end of first Er-doped fiber 10 (the SM-ESF-7/125 Er-doped fibers of Nufern companies of U.S. production) is connected, the first er-doped light
The other end of fibre 10 is connected with the common port of wavelength division multiplexer 2.Said structure constitutes traditional Active Mode-locked Fiber Laser
Resonator.
The present invention is also inhaled on the basis of traditional Active Mode-locked Fiber Laser resonator based on graphene saturable
The passive mode-locking fiber laser system of acceptor and the pulse optimization system being made up of two automatic feedback control rings, structure
For, 40% output end of the 3rd photo-coupler 11 and the 4th photo-coupler 12, (1 × 2 standard single mode photo-coupler, splitting ratio is
50：50) input is connected, and 60% output end of the 3rd photo-coupler 11 is used as described high stability optical pulse generator
Output port, thus port is exported for the light pulse that system is produced；One 50% output end of the 4th photo-coupler 12 and the first light
The input of detector 13 (the LSIPD-LD50 types photo-detector of the quick Micron Technology Co., Ltd in Beijing) is connected, and another is 50% defeated
Go out end with the input of the second photo-detector 18 (the LSIPD-LD50 types photo-detector of the quick Micron Technology Co., Ltd in Beijing) to be connected；
The output end of first photo-detector 13 is connected with the input of A/D converter 14 (MAX197), the output of A/D converter 14
End is connected with single-chip microcomputer 15 (STC89C51 single-chip microcomputers), and single-chip microcomputer 15 receives digital quantity and carries out calculating processing；Single-chip microcomputer 15 with number/
The input of weighted-voltage D/A converter 16 (AD7541) is connected, the output end of D/A converter 16 and (this of the first piezoelectric ceramic actuator 17
The homemade device of seminar, concrete structure is shown in patent ZL200710055865.8) input be connected, the first Piezoelectric Ceramic
The output end of device 17 is connected with the first PZT piezoelectric ceramics 7 (cylindrical piezoelectric ceramics, external diameter 50mm, internal diameter 40mm, high 50mm),
To control the length of resonator；The output end of second photo-detector 18 is connected with the input of amplifying circuit 19, amplifying circuit 19
Output end (the homemade device of this seminar, concrete structure is shown in patent with the second piezoelectric ceramic actuator 20
ZL200710055865.8 input) is connected, output end and the 2nd PZT piezoelectric ceramics 21 of the second piezoelectric ceramic actuator 20
It is connected, the one end for the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 21 and a 50% output end phase of the second photo-coupler 8
Even, another 50% output end of the second photo-coupler 8 and the second optoisolator 22 (1550nm polarization independent optical isolators)
Input is connected, and the second optoisolator 22 allows the counter clockwise direction that light pulse is accompanying drawing 1 by direction；Second optoisolator 22
Output end be connected with one end of dispersion compensating fiber 23 (the DCF38 types dispersion compensating fiber of THORLABS companies of the U.S.), color
Multi-layer graphene (is produced on the end of side fibre-optical splice by the other end and graphene saturable absorber 24 for dissipating compensated optical fiber 23
On face, this joint is connected with the fibre-optical splice of opposite side with the joints of optical fibre, the joints of optical fibre can use the vast space light in Shanghai
Fiber communication Technology Co., Ltd. production the standard FC/PC joints of optical fibre) one end be connected；Graphene saturable absorber 24
The other end is connected with the one end of single-mode fiber 25 (standard single-mode fiber), the other end of single-mode fiber 25 and the second Er-doped fiber 26
The one end of the SM-ESF-7/125 Er-doped fibers of production (Nufern companies of the U.S.) is connected, the other end of the second Er-doped fiber 26 with
The other end for the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 21 is connected.
The course of work of the present invention of embodiment 2 and the effect of each critical piece
In structure shown in accompanying drawing 1, pump light source 1 is as the laser pumping source of whole system, and pump light source 1 passes through wavelength-division
Multiplexer 2 enters in system；Splitting ratio is 10：The laser that intracavitary is run is divided into two parts, one by 90 the first photo-coupler 3
(90%) is divided to export to the 3rd photo-coupler 11, another part (10%) continues to transport in Active Mode-locked Fiber Laser resonator
OK；Splitting ratio is 40：The laser that first photo-coupler 3 is exported is divided into two parts by 60 the 3rd photo-coupler 11, a part
(60%) exported as the laser of whole system, another part (40%) is output to the 4th photo-coupler 12 as the feedback of system
Signal；The polarization state that Polarization Controller 4 is used in control system；First optoisolator 9 is used to ensure active mode-locked fiber laser
The unidirectional operation of light in device resonator；First Er-doped fiber 10 produces gain effect in systems, it is ensured that operation swashs in resonator
The energy of light is unattenuated；Splitting ratio is 50：50 the second photo-coupler 8 is connected to active mode locking and passive mode-locking two parts knot
Structure, makes passive mode-locking fiber laser system and Active Mode-locked Fiber Laser system based on graphene organically combine one
Rise, realize main passive mixed mode-locking；Graphene saturable absorber 24 is that grapheme material is fabricated into saturable absorber, is used
In the generation of mode-locked ultrashort pulse.The optical signal that second 26 pairs of Er-doped fiber is transmitted wherein carries out gain amplification, makes system defeated
The optical pulse energy gone out further increases.
4th photo-coupler 12 will receive light and be divided into two-way, export all the way to the first photo-detector 13, be visited by the first light
Survey device 13 and convert optical signals to electric current, A/D converter 14 receives the electric signal of the first photo-detector 13 output, and will simulation
Signal is converted to data signal, is allowed to be adapted to subsequent control；The data signal that single-chip microcomputer 15 receives the output of A/D converter 14 is entered
Row calculating is handled, and produces control signal；The control signal that single-chip microcomputer 15 is exported is converted to analog signal by D/A converter 16
Export to the first piezoelectric ceramic actuator 17, the first piezoelectric ceramic actuator 17 amplifies the control signal received for driving
First PZT piezoelectric ceramics 7, and then the length for the optical fiber being entangled on the first PZT piezoelectric ceramics 7 is controlled to active mode-locked fiber laser
Device resonator enters the compensation of an actor's rendering of an operatic tune length, overcomes chamber length to drift about, it is ensured that the reliability of system locked mode.
Another road of 4th photo-coupler 12 output is exported to the second photo-detector 18, and the second photo-detector 18 is converted
For electric signal and by amplifying circuit 19 be amplified after give the second piezoelectric ceramic actuator 20, the second piezoelectric ceramic actuator 20
It is used to drive the 2nd PZT piezoelectric ceramics 21 after the control signal received is amplified, and then controls to be entangled in the 2nd PZT piezoelectric ceramics
The length of optical fiber on 21, to ensure based on produced by the passive mode-locking fiber laser system of graphene saturable absorber
Orphan's type Auto-matching that orphan's type is produced with Active Mode-locked Fiber Laser resonator, and then make what whole system was exported
Ultrashort high-speed optical pulse is optimized.
Claims (1)
1. a kind of high stability optical pulse generator, its structure has, pump light source (1) and the 980nm ends phase of wavelength division multiplexer (2)
Even, the 1550nm ends of wavelength division multiplexer (2) are connected with the input of the first photo-coupler (3)；The 10% of first photo-coupler (3)
Output end is connected with the one end of Polarization Controller (4), the other end of Polarization Controller (4) and the niobic acid driven by microwave source (6)
The input of lithium modulator (5) is connected；The output end of lithium niobate modulator (5) is with being wrapped on the first PZT piezoelectric ceramics (7)
One end of optical fiber is connected；The other end and the second photo-coupler of the described optical fiber being wrapped on the first PZT piezoelectric ceramics (7)
(8) a input is connected；The input phase of another input of the second photo-coupler (8) and the first optoisolator (9)
Even；The output end of first optoisolator (9) is connected with one end of the first Er-doped fiber (10), the first Er-doped fiber (10) it is another
End is connected with the common port of wavelength division multiplexer (2)；
Characterized in that, structure also has the input of the 3rd photo-coupler (11) and 90% output end of the first photo-coupler (3)
It is connected, 40% output end of the 3rd photo-coupler (11) is connected with the input of the 4th photo-coupler (12), the 3rd photo-coupler
(11) 60% output end as described high stability optical pulse generator output port；The one of 4th photo-coupler (12)
Individual 50% output end is connected with the input of the first photo-detector (13), another 50% output end and the second photo-detector (18)
Input be connected；The output end of first photo-detector (13) is connected with the input of A/D converter (14), analog/digital conversion
The output end of device (14) is connected with single-chip microcomputer (15), and single-chip microcomputer (15) is connected with the input of D/A converter (16), D/A
The output end of converter (16) is connected with the input of the first piezoelectric ceramic actuator (17), the first piezoelectric ceramic actuator (17)
Output end be connected with the first PZT piezoelectric ceramics (7)；The output end of second photo-detector (18) and the input of amplifying circuit (19)
End is connected, and the output end of amplifying circuit (19) is connected with the input of the second piezoelectric ceramic actuator (20), the second piezoelectric ceramics
The output end of driver (20) is connected with the 2nd PZT piezoelectric ceramics (21), is wrapped in the optical fiber on the 2nd PZT piezoelectric ceramics (21)
One end be connected with 50% output end of the second photo-coupler (8), another 50% output end of the second photo-coupler (8)
It is connected with the input of the second optoisolator (22), the output end of the second optoisolator (22) and the one of dispersion compensating fiber (23)
End is connected, and the other end of dispersion compensating fiber (23) is connected with one end of graphene saturable absorber (24)；Graphene can satisfy
It is connected with the other end of absorber (24) with one end of single-mode fiber (25), the other end of single-mode fiber (25) and the second er-doped light
The one end of fine (26) is connected, and the other end of the second Er-doped fiber (26) is wrapped on the 2nd PZT piezoelectric ceramics (21) with described
Optical fiber the other end be connected.
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