CN108923232A - A kind of frequency regulator for multi-wavelength optical fiber laser - Google Patents
A kind of frequency regulator for multi-wavelength optical fiber laser Download PDFInfo
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- CN108923232A CN108923232A CN201810789057.2A CN201810789057A CN108923232A CN 108923232 A CN108923232 A CN 108923232A CN 201810789057 A CN201810789057 A CN 201810789057A CN 108923232 A CN108923232 A CN 108923232A
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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
-
- 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
-
- 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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of frequency regulators for multi-wavelength optical fiber laser, it is characterized in that, including tunable light source (1), first photo-coupler (2), first optical circulator (4), wavelength division multiplexer (7), second optical circulator (9), highly nonlinear optical fiber (10), pump light source (11), the tunable light source (1), first photo-coupler (2), first optical circulator (4), wavelength division multiplexer (7), second optical circulator (9), highly nonlinear optical fiber (10) is sequentially connected, the pump light source (11) connect with the wavelength division multiplexer (7).The present invention is easy to that fibre system is integrated, efficient balance multiple-wavelength laser output power, improves multiple-wavelength laser output bandwidth.
Description
Technical field
The invention belongs to the technical fields of optic communication, and in particular to a kind of frequency stabilization dress for multi-wavelength optical fiber laser
It sets.
Background technique
To improve message capacity, modern optical fiber WDM communication system just develops towards the more and more directions of the number of channel, and mesh
The preceding method for most directly providing multiple signals is exactly to use multiple single wavelength lasers, and merely increase quantity of light source, is bound to
It will increase cost, therefore the development of the stable multiple-wavelength laser of performance and valued using more people.Multiple-wavelength laser
Required light source can be provided for multiple channels simultaneously, it is more compact, economical to make the design of light emitting end, thus in dwdm system
There is critically important purposes.Meanwhile the multi wave length illuminating source of function admirable is in necks such as laser ranging, spectrum analysis and profile fiber sensings
Also there is great application value in domain.Multi-wavelength Brillouin optical fiber laser utilizes general single mode fiber or dispersion shifted optical fiber
In Brillouin scattering (SBS), stable multi-wavelength output can be obtained in erbium doped fiber laser.In such method, SBS is mentioned
For the gain of narrow bandwidth, make the presence of the accurate frequency shift amount determined by the velocity of sound in optical fiber between Brillouin scattering wave and pumping wave,
In 1550nm wave band, frequency shift amount 10GHz provides linear gain using earliest Deadline First algorithm come compensation resonant cavity
Loss, Brillouin signal is amplified, to improve the output power of multi-wavelength signals, such multi-wavelength optical fiber laser exists
It at room temperature can steady operation.
Multi-wavelength Brillouin optical fiber laser DWDM optical fiber telecommunications system, the generation of microwave signal, optical instrument test,
Fibre Optical Sensor and spectral measurement etc. are multi-field major application prospect.Stimulated Brillouin scattering is widely studied as a kind of
Nonlinear optical phenomena is generated by photon in optical fiber and phonon interaction.Cascade Brillouin scattering is commonly used to
Multi-wavelength concussion is generated, both upper pumping of the single order stokes light after EDFA as lower single order stokes light.Usually it
Gain only include SMFSBS gain and the gain of EDFA, so gain spectral is relatively narrow, a small amount of multi-wavelength can only be generated.
Therefore, existing multi-wavelength Brillouin laser narrow bandwidth, however it remains area for improvement.
Summary of the invention
The present invention multi-wavelength Brillouin erbium-doped fiber laser (MWBEFL) there are aiming at the problem that：Such as relatively narrow multi-wavelength
Bandwidth, the disadvantages such as the stokes light and anti-Stokes optical power of high-order are lower, and optical signal to noise ratio is low, provides a kind of by Gao Fei
Linear optical fiber is used to enhance the technical solution of multi-wavelength Brillouin optical fiber laser output.Highly nonlinear optical fiber is beneficial due to its
Inner parameter supports stronger multi-wavelength to cover by four-wave mixing.In MWBEFL, the multi-wavelength light of gain spectral centre is being passed through
The threshold value that power when EDFA is amplified into highly nonlinear optical fiber easily reaches FWM is crossed, due to the FWM occurred between them
Effect provides fractionated gain for MWBEFL, although overall gain value is constant, FWM gain increases the effective of laser gain spectrum
Width so that high-order stokes light and anti-Stokes light are all enhanced, to increase the number of multi-wavelength.
In order to achieve the above object of the invention, the present invention uses following technical scheme：
A kind of frequency regulator for multi-wavelength optical fiber laser, including：Tunable light source, the first photo-coupler, the first light
Circulator, wavelength division multiplexer, the second optical circulator, highly nonlinear optical fiber, pump light source, the tunable light source, the first optical coupling
Device, the first optical circulator, wavelength division multiplexer, the second optical circulator, highly nonlinear optical fiber are sequentially connected, the pump light source and institute
State wavelength division multiplexer connection.
As a kind of perferred technical scheme, the tunable light source uses narrow line width regulatable laser.
It as a kind of perferred technical scheme, further include single mode optical fiber and third photo-coupler, the single mode optical fiber both ends
It is connect respectively with the both ends of the third photo-coupler, the third photo-coupler is multiple set on first optical circulator, wavelength-division
With between device.
As a kind of perferred technical scheme, the third photo-coupler is four port three-dB couplers；And/or the list
Mode fiber length is 25km.
It as a kind of perferred technical scheme, further include Er-doped fiber, the Er-doped fiber is set to wavelength division multiplexer, second
Between optical circulator.
As a kind of perferred technical scheme, the gain ranging of the Er-doped fiber is 1530nm to 1570nm.
It as a kind of perferred technical scheme, further include the second photo-coupler, the second photo-coupler first port,
Three ports are connect with the first photo-coupler, the first circulator respectively.
As a kind of perferred technical scheme, the first port of second photo-coupler be 90% port, described second
The second port of photo-coupler is 10% port；And/or first photo-coupler uses three-dB coupler；And/or described
Two photo-couplers use 10dB coupler.
As a kind of perferred technical scheme, the nonlinear factor of the highly nonlinear optical fiber is more than or equal to 21w-1km-1。
As a kind of perferred technical scheme, the wavelength interval of the multistage anti-Stokes light is 0.08nm.
Compared with prior art, the present invention beneficial effect is：
1, be conducive to and fibre system is integrated, efficient balance multiple-wavelength laser output power, improve multiwavelength laser
Device output bandwidth；
2, Brillouin's chamber is constituted using a four port couplers connection single mode optical fiber and generates multistage laser signal, circulator
The highly nonlinear optical fiber of connection promotes multi-wavelength output bandwidth and power；
3, using highly nonlinear optical fiber as gain media, existing MWBEFL is compared, laser output bandwidth is wider；Together
When combine Er-doped fiber and single mode optical fiber that bandwidth has been effectively ensured collectively as gain media；
4, bigger in the potentiality of photon microwave regime based on Brillouin scattering Er-doped fiber multiple-wavelength laser, it is applicatory
Range is more extensive, meets more use demands.
Detailed description of the invention
Fig. 1 is highly nonlinear optical fiber for the constructional device schematic diagram in multi-wavelength Brillouin optical fiber laser.
Fig. 2 is the output light spectrogram of multi-wavelength optical fiber laser when highly nonlinear optical fiber not being added.
Fig. 3 is the output light spectrogram of multiple-wavelength laser when highly nonlinear optical fiber is added.
Specific embodiment
Below by specific embodiment the technical scheme of the present invention will be further described explanation so that the technical program is more
Add clear, clear.
If raw material employed in the embodiment of the present invention is raw material commonly used in the art without specified otherwise, implement
Method employed in example, is the conventional method of this field.
In technical solution of the present invention, it is more that the generation of Brillouin's chamber is constituted using a four port couplers connection single mode optical fiber
The highly nonlinear optical fiber of rank laser signal, circulator connection promotes multi-wavelength output bandwidth and power.The present invention utilizes er-doped
Optical fiber and single mode optical fiber and highly nonlinear optical fiber are collectively as gain media.
As shown in Figure 1, including adjustable present embodiment discloses a kind of frequency regulator for multi-wavelength optical fiber laser
Light source (1), the first photo-coupler (2), the second photo-coupler (3), the first optical circulator (4), third photo-coupler (5), single mode
Optical fiber (6), wave crest multiplexer (7), Er-doped fiber (8), the second optical circulator (9), highly nonlinear optical fiber (10) and pump light source
(11), wherein tunable light source (1) is connect with the first port (a) of the first photo-coupler (1) by optical fiber, the first photo-coupler
(1) public port (c) is connect with the first port (g) of the first circulator (4) by optical fiber, and the of the first photo-coupler (1)
Two-port netwerk (b) is connect with the second photo-coupler (3) first port (d) by optical fiber, the second photo-coupler (3) public port (f)
It is connect with the third port (i) of the first circulator (4) by optical fiber；The second port (h) and third optocoupler of first circulator (4)
The first port (o) of clutch (5) is connected by optical fiber；The second port (p) of third photo-coupler (5) and wavelength division multiplexer (7)
First port (s) connection, third port (q) order mode fiber (6) one end of third photo-coupler (5), third photo-coupler
(5) the 4th port (r) order mode fiber (6) other end, second port (u) and pump light source (11) of wavelength division multiplexer (7)
Connection；The public port (t) of wavelength division multiplexer (7) is connected with Er-doped fiber (8) one end, Er-doped fiber (8) other end and second
The second port (w) of optical circulator (9) is connected；The first port (x) and highly nonlinear optical fiber (10) one of second optical circulator (9)
End is connected, and the third port (y) of the second optical circulator (9) is connected with highly nonlinear optical fiber (10) other end.
In the present embodiment, the first port (d) of the first photo-coupler (3) is 90% port, and second port (e) is 10% end
Mouthful.
In the present embodiment, the gain ranging of Er-doped fiber (8) is 1530nm to 1570nm.Highly nonlinear optical fiber nonlinear system
Number is more than or equal to 21w-1km-1.First photo-coupler (2) is three-dB coupler, and third photo-coupler (6) is four port 3dB coupling
Device.The first port of second photo-coupler (3) is 90% port, and second port is 10% port.Single mode optical fiber (6) length is
25km。
The frequency stabilization skill disclosed by the invention being used for using highly nonlinear optical fiber in multi-wavelength Brillouin erbium-doped fiber laser
Art scheme can widen the output bandwidth of multi-wavelength optical fiber laser.The present invention by tunable laser sources, input and output ring cavity,
Brillouin's chamber, image intensifer, high non-linearity chamber are constituted.Input and output chamber is defeated by 3dB input coupler, the first circulator and 10dB
Coupler is formed by connecting out, and Brillouin's chamber is formed by connecting by tetra- port coupler of 3dB and single mode optical fiber, wavelength division multiplexer, pumping
Light source and one section of Er-doped fiber constitute image intensifer, and the second optical circulator and one section of highly nonlinear optical fiber constitute high non-linearity chamber.
The seed light that tunable laser sources issue is amplified by input coupler input system by image intensifer, is generated in Brillouin's chamber more
Wavelength laser, by high non-linearity chamber equilibrium Multi-wavelength laser power, stablize multiwavelength laser frequency, finally by output coupler
The output of 10% port, dump power are recycled by input and output chamber.It is integrated, effectively equal that fibre system is easy to using the device of the invention
Weighed multiple-wavelength laser output power, improves the output bandwidth of multiple-wavelength laser.
Basic principle of the invention is：Brillouin's pump signal (BP) of narrow line width regulatable laser output passes through first
Enter Brillouin's chamber through the first optical circulator 4 along clockwise direction after coupler 2 to put after image intensifer (i.e. wavelength division multiplexer 7)
Greatly, it crosses highly nonlinear optical fiber 10 into the second optical circulator 9 to be returned by the second optical circulator 9 again, then by image intensifer (i.e. wavelength-division
Multiplexer 7) amplification, Brillouin's chamber is again passed by, Brillouin threshold is reached, generates stokes light, stokes light return light
Amplifier (i.e. wavelength division multiplexer 7), remaining optical power return to Brillouin's chamber by 4 left end input and output ring of the first optical circulator
In, stokes light shakes back and forth in systems, generates multistage stokes light, and multistage stokes light passes through high non-linearity light
Fibre 10, due to FWM effect, the Stokes optical power of low order is to high-order stokes light and anti-Stokes light transfer or low
Rank stokes light generates higher order stokes light anti-Stokes light, constantly repeats by this process, generates until newly
The intensity of BS signal when being unsatisfactory for brillouin gain threshold condition, cascade process terminates.The output of laser passes through spectrometer
(AQ6370B) it is observed and measured.
It shown in Fig. 3, is under identical BP power and the input condition of device parameters with Fig. 2, when highly nonlinear optical fiber is added
The output light spectrogram of multiple-wavelength laser.
Highly nonlinear optical fiber is added as gain media in the present invention in conventional multi-wavelength Brillouin optical fiber laser, compares
Existing multi-wavelength Brillouin laser, laser output bandwidth is wider, including between more multistage anti-Stokes light and wavelength
Be divided into 0.08nm, this make it is bigger in the potentiality of photon microwave regime based on Brillouin scattering Er-doped fiber multiple-wavelength laser,
Range applicatory is more extensive.
The present invention is based on the processes of the Er-doped fiber multiwavelength laser of highly nonlinear optical fiber output：
1, according to the output wavelength range of the multi-wavelength optical fiber laser of required acquisition, the coupling of proper operation wavelength is chosen
Clutch, optical circulator and erbium-doped fiber amplifier.
2, the highly nonlinear optical fiber of appropriate length is chosen.
3, Er-doped fiber length is determined according to intracavitary loss.
4, tunable light source and pumping source are opened, tunable light source and pumping source output power is adjusted, adjusts the defeated of tunable light source
Wavelength out, multiple-wavelength laser, which is realized, stablizes multi-wavelength output.
The above are the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited, for those skilled in the art
The deformation and improvement that member's mentality of designing according to the present invention is made, all should be considered as within protection scope of the present invention.Specifically
It says, those skilled in the art can be designed that a lot of other modification and implementations, these modifications and implementations will be fallen in
Within scope and spirit disclosed in the present application, disclose in the application, drawings and claims in the range of, can be to theme
The building block and/or layout of composite configuration carry out a variety of variations and modifications.In addition to the change carried out to building block and/or layout
Type and improvement are outer, and to those skilled in the art, other purposes also will be apparent.
Claims (10)
1. a kind of frequency regulator for multi-wavelength optical fiber laser, which is characterized in that including tunable light source (1), the first optocoupler
Clutch (2), the first optical circulator (4), wavelength division multiplexer (7), the second optical circulator (9), highly nonlinear optical fiber (10), pump light
Source (11), the tunable light source (1), the first photo-coupler (2), the first optical circulator (4), wavelength division multiplexer (7), second ring of light
Row device (9), highly nonlinear optical fiber (10) are sequentially connected, and the pump light source (11) connect with the wavelength division multiplexer (7).
2. a kind of frequency regulator for multi-wavelength optical fiber laser according to claim 1, which is characterized in that it is described can
Light modulation source (1) uses narrow line width regulatable laser.
3. a kind of frequency regulator for multi-wavelength optical fiber laser according to claim 1, which is characterized in that further include
Single mode optical fiber (6) and third photo-coupler (5), single mode optical fiber (6) both ends respectively with the third photo-coupler (5) two
End connection, the third photo-coupler (5) are set between first optical circulator (4), wavelength division multiplexer (7).
4. a kind of frequency regulator for multi-wavelength optical fiber laser according to claim 1, which is characterized in that described
Three photo-couplers (5) are four port three-dB couplers；And/or single mode optical fiber (6) length is 25 kms.
5. a kind of frequency regulator for multi-wavelength optical fiber laser according to claim 1 to 4, which is characterized in that
It further include Er-doped fiber (8), the Er-doped fiber (8) is set between wavelength division multiplexer (7), the second optical circulator (9).
6. a kind of frequency regulator for multi-wavelength optical fiber laser according to claim 5, which is characterized in that described to mix
The gain ranging of erbium optical fiber (8) is 1530nm to 1570nm.
7. a kind of frequency regulator for multi-wavelength optical fiber laser according to claim 1, which is characterized in that further include
Second photo-coupler (3), the second photo-coupler (3) first port (d), third port (f) respectively with the first photo-coupler
(2), first annular device (4) connection.
8. a kind of frequency regulator for multi-wavelength optical fiber laser according to claim 7, which is characterized in that described
The first port (d) of two photo-couplers (3) is 90% port, and the second port (e) of second photo-coupler (3) is 10% end
Mouthful；
And/or first photo-coupler (2) uses three-dB coupler；
And/or second photo-coupler (3) uses 10dB coupler.
9. a kind of frequency regulator for multi-wavelength optical fiber laser according to claim 1, which is characterized in that the height
The nonlinear factor of nonlinear optical fiber (10) is more than or equal to 21w-1km-1。
10. a kind of for multi-wavelength optical fiber laser described according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9
Frequency regulator, which is characterized in that the wavelength interval of the multistage anti-Stokes light is 0.08nm.
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| CN201810789057.2A CN108923232A (en) | 2018-07-18 | 2018-07-18 | A kind of frequency regulator for multi-wavelength optical fiber laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111628408A (en) * | 2020-05-19 | 2020-09-04 | 电子科技大学 | Frequency stabilization system of semiconductor laser |
| CN112798230A (en) * | 2020-12-29 | 2021-05-14 | 深圳市星汉激光科技股份有限公司 | Optical path testing system and method for light return resistance of semiconductor laser |
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| CN101752776A (en) * | 2010-01-12 | 2010-06-23 | 浙江师范大学 | Method and device for obtaining multi-wavelength laser |
| CN102496846A (en) * | 2011-12-15 | 2012-06-13 | 杭州电子科技大学 | Adjustable double-wavelength optical fiber laser based on Brillouin scattering |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111628408A (en) * | 2020-05-19 | 2020-09-04 | 电子科技大学 | Frequency stabilization system of semiconductor laser |
| CN112798230A (en) * | 2020-12-29 | 2021-05-14 | 深圳市星汉激光科技股份有限公司 | Optical path testing system and method for light return resistance of semiconductor laser |
| CN112798230B (en) * | 2020-12-29 | 2023-05-05 | 深圳市星汉激光科技股份有限公司 | Light path test system and method for return light resistance of semiconductor laser |
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Application publication date: 20181130 |