CN110165541A - Changeable Brillouin-Er-doped fiber the accidental laser in wavelength interval - Google Patents
Changeable Brillouin-Er-doped fiber the accidental laser in wavelength interval Download PDFInfo
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- CN110165541A CN110165541A CN201910519403.XA CN201910519403A CN110165541A CN 110165541 A CN110165541 A CN 110165541A CN 201910519403 A CN201910519403 A CN 201910519403A CN 110165541 A CN110165541 A CN 110165541A
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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
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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
- H01S3/06758—Tandem amplifiers
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses Brillouin-Er-doped fiber random fiber lasers that a kind of wavelength interval can be switched, for half-open cavity configuration, including ring opening moiety and straight line portion, in ring opening moiety, circulator one end is connect with coupler output, the circulator other end is connect with coupler input mouth, and another input terminal of coupler pumps source output terminal with Brillouin and connect, and another output end of coupler is connect with spectrometer input；Straight line portion includes two connected straight line units, and straight line units include pumping source, wavelength division multiplexer, Er-doped fiber and single mode optical fiber；Pumping source output terminal is connect with wavelength division multiplexer input terminal, and wavelength division multiplexer output end is connect with Er-doped fiber；The Er-doped fiber other side is connect with single mode optical fiber one end, and the single mode optical fiber other end is connect with second straight line unit wavelength division multiplexer；The single mode optical fiber of second straight line units is connect with isolator.The present invention realizes the changeable Brillouin's Stokes light output in wavelength interval by the switch and power of adjusting pumping source.
Description
Technical field
The present invention relates to the changeable Brillouin-Er-doped fiber of accidental laser more particularly to a kind of wavelength interval is random
Laser.
Background technique
The concept of Random Laser is equal to 1966 by Ambartsumyan earliest to be proposed.Compared with conventional laser, at random
The optical resonator that laser is not fixed, light feedback are realized by the Multiple Scattering effect in Disordered Media, utilize scattering light
Interference effect generate specific frequency resonance mode, realize Random Laser output.In recent decades, Random Laser is passed in optical fiber
The potential application in the fields such as sense, physical optics imaging, spectral measurement, microwave photon and biomedicine has attracted a large amount of interest to like
Good person.
The optical resonator that Random Laser is not fixed, working principle are that light Multiple Scattering in Disordered Media is anti-to realize
Feedback, the interference effect for scattering light generate mode of resonance under specific frequency, realize that Random Laser generates.Accidental laser has not
It is required that stringent optical resonator, the advantages that multiple incoherent zlasing modes can be generated simultaneously, but have emission spectrum diagonal
The disadvantages of high dependence of degree and high threshold power.
In recent years, random fiber laser was due to its great potential in terms of optic communication and Fibre Optical Sensor, from 2010
Since being put forward for the first time, have received widespread attention.It is different from the optical fiber laser that tradition has lock chamber long, random fiber laser
It is fed back by the Rayleigh scattering offer random distribution in optical fiber, has structure is simple, is not necessarily to fixed point feed back, is incoherent, relatively strong
Spend low noise advantages.The gain mechanism of random fiber laser develops to stimulated Brillouin scattering, dilute from stimulated Raman scattering
The stimulated emission of native doped fiber and above-mentioned hybrid gain.
Optical fiber is selected to improve Random Laser performance, Turitsyn as a kind of waveguide with two-dimensional constrains performance
Deng report for the first time it is a kind of based on Rayleigh scattering random distribution feedback random fiber laser, in 83 kilometers of overall length of traditional light
Amplified in fibre using distributed Raman gain, obtains stable Random Laser signal output.2011, Vatnik etc. reported base
In Raman gain and Rayleigh scattering random distribution feedback generate cascade Random Laser, experiment obtain wavelength 1.2 μm second
Grade Stokes random signal.2013, Zhang etc. was proposed a kind of mixed using dispersion compensating fiber and single mode optical fiber and constituted
Semi-open Random Laser chamber, obtain single order and second order of Stokes Random Laser respectively from Raman random fiber laser.
However, generating Random Laser threshold power with higher based on Raman scattering cascade, (threshold value of second-order stockes line is super
Cross 1W), the stockes line quantity of generation few (being no more than 3 rank stockes lines) and the big wavelength spacing of 100nm etc. are apparent to be lacked
Point.
Stimulated Brillouin scattering SBS, which is widely used in realizing, has accurate and stable wavelength interval and a large amount of stokes
The cascade multi-wavelength optical fiber laser of this line.Be formed by accidental distributed feedback based on Rayleigh scattering, by by SBS gain with
Gain in Er-Doped Fiber Amplifiers or stimulated Raman scattering gain combine, it has been reported that multi-wavelength Brillouin-Er-doped fiber/drawing
Graceful accidental laser.For example, Pang etc. reports a kind of relevant Brillouin's random fiber laser, in one section of inhomogeneous fiber
Rayleigh scattering fed back as random distribution, Brillouin scattering obtains stable unimodal as gain in conventional single mode fiber
The output of narrow linewidth Brillouin's Random Laser.For being applied to the multi-wavelength optical fiber laser of dense wavelength division multiplexing system, it is desirable that each
Channel output power is as more and flat as possible, and it is poor to reduce random multiwavelength laser peak power that researcher has done effort
It is different flat to improve wavelength number and power but still less desirable.
Summary of the invention
Goal of the invention: the Brillouin-Er-doped fiber that can be switched the object of the present invention is to provide a kind of wavelength interval swashs at random
Light device, it is weak to solve Brillouin signal light feedback in random fiber laser, it is few by cascading the Brillouin's order that can be generated
Problem, and can be realized the changeable output in wavelength interval.
Technical solution: the changeable Brillouin-Er-doped fiber accidental laser in wavelength interval of the present invention, laser are half
It begins to speak structure, including ring opening moiety, and the straight line portion being connect with ring opening moiety, ring opening moiety passes through circulator and straight line portion
Divide connection；
In ring opening moiety, the port A of circulator is connect with the output port of 3-dB coupler, the C port and 3- of circulator
The input port of dB coupler connects, and another input port of 3-dB coupler is connect with the output end of Brillouin's pumping source, 3-
Another output port of dB coupler and the input port of spectrometer connect；
Straight line portion includes two straight line units being connected, and straight line units include pumping source, wavelength division multiplexer, er-doped light
Fine and single mode optical fiber；The output end of pumping source and the input terminal of wavelength division multiplexer connect, the output end of wavelength division multiplexer and er-doped
Optical fiber connection；The other side of Er-doped fiber and one end of single mode optical fiber connect, the other end of single mode optical fiber and second straight line list
The wavelength division multiplexer connection of member；The other end of the single mode optical fiber of the last one straight line units is connect with isolator.
Circulator has tri- ports A, B, C, and circulator connects ring opening moiety with C port by A, and circulator passes through the end B
Mouth is connect with the wavelength division multiplexer of straight line portion.
Er-doped fiber uses laser diode two directional pump mode so that reversed and forward direction Brillouin signal light can amplify.
After Brillouin's pumping source passes through three-dB coupler, 50% power injects the port B by the port A of circulator.
Brillouin's pumping source is that tuning range is 970nm~1680nm, and output power range is 7.4dBm~12.4dBm's
Tunable laser source.
When the power of Brillouin's pump light is greater than stimulated Brillouin scattering threshold value, single order Brillouin stokes light is generated,
Rayleigh scattering then provides random distribution feedback；The single order stokes wave of back-propagating will be amplified for the first time by Er-doped fiber,
50% stokes light is exported from the output port of 3-dB coupler.
Working principle: in a fiber, the position of the Erbium-doped fiber amplifier random light weaker to distributed feed-back in improvement optical fiber
The performance of fibre laser is most important.After Er-doped fiber is added in bilateral port, Er-doped fiber gain can produce for bilateral amplification
Raw stokes light, which provides, effectively and adequately to be amplified, and the performance of random fiber laser is substantially improved.The present invention proposes
Er-doped fiber linear gain is introduced in the bilateral port of circulator, while guaranteeing that Brillouin's pump light obtains amplification, so that
Brillouin signal light obtains bilateral amplification, and repeatedly cascade generates multistage Brillouin's wavelength.Er-doped fiber uses two directional pump mode,
So that reversed and forward direction Brillouin signal light can effectively be amplified.When Brillouin's pumping light power is dissipated more than excited Brillouin
When penetrating threshold value, single order Brillouin stokes light is generated, Rayleigh scattering then provides random distribution feedback.The single order of back-propagating this
Lentor wave will be amplified for the first time by Er-doped fiber, and 50% stokes light is exported from the output port of 3-dB coupler.Other
By left side open loop, be again introduced into after Erbium-doped fiber amplifier and reenter single mode optical fiber as new pump light.With this mistake
The cascade of journey can produce high-order Brillouin's stokes light.It is finally real in laser cavity using Brillouin-er-doped hybrid gain
Multistage Stokes light generation is showed, the adjustability of wavelength may be implemented by changing Brillouin's pumping wavelength.This half-open
It puts in chamber design, a kind of tunable multi-wavelength Brillouin-er-doped Random Laser may be implemented.
Er-doped fiber linear gain is introduced in the bilateral port of circulator, Brillouin's pump light is injected by 3-dB coupler
To after the open loop of the left side, reaches after the port circulator B is first amplified and be injected into long single mode optical fiber again.Due to being excited in single mode optical fiber
The backward Stokes signal that Brillouin scattering generates, first amplifies in Er-doped fiber, enters back into left side semi-loop, and part exports
Afterwards, enter Er-doped fiber again by the port circulator B to amplify, then generate next stage stimulated Brillouin scattering.
The utility model has the advantages that compared with prior art, the invention has the following advantages that
(1) all devices of the invention are all made of all -fiber coupled modes, are not interfered by extraneous factor, can continuous-stable work
Make；
(2) while the bilateral port of circulator introduces Er-doped fiber linear gain, and Brillouin's pump light obtains amplification,
So that Brillouin signal light obtains bilateral amplification, repeatedly cascade generates multistage Brillouin's wavelength；Pass through two pumping sources of control
The switching that output wavelength list is spaced again between double interval may be implemented in the size of switch and power；
(3) Brillouin signal light of the invention obtains more large gain, can generate Brillouin's stokes light of higher order；
(4) difference power between multistage Brillouin's stokes light is smaller, can produce flat multistage Brillouin's wavelength.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the Random Laser output spectrum with 20 rank Brillouin's stokes lights；
Fig. 3 is single times of wavelength interval output spectrum when only opening first 980nm Er-doped fiber pumping source；
Fig. 4 is double wavelength interval output spectrum when only opening second 980nm Er-doped fiber pumping source.
Specific embodiment
As shown in Figure 1, multi-wavelength Brillouin of partly beginning to speak-Er-doped fiber accidental laser includes two pumping sources, 1, two wave
2, two sections of Er-doped fibers 3 of division multiplexer, two section single-mould fibers 4, isolator 5, circulator 6,3-dB coupler 7, Brillouin's pumping
Source 8, spectrometer 9.The accidental laser has a semi-open cavity configuration, including left side ring opening moiety and straight right part, and two
Divide and connected by circulator 6, wherein circulator 6 has tri- ports A, B, C.
The side of Er-doped fiber 3 is equipped with pumping source 1 and wavelength division multiplexer 2；The output end of two pumping sources 1 all respectively with wave
One input terminal of division multiplexer 2 is connected, and the output end of wavelength division multiplexer 2 is connect with one end of Er-doped fiber 3；Er-doped fiber 3
The other side is connect with one end of long-range single mode fiber 4, and the other end of first segment long-range single mode fiber 4 and second wavelength-division are multiple
It is connected with the input terminal of device 2, the other end of second segment long-range single mode fiber 4 is connect with isolator 5；First wavelength division multiplexer
2 signal input part is connect with the port B of circulator 6；The port A of circulator 6 and C port respectively with 3-dB coupler 7
One output port is connected with first input port；Second input port of 3-dB coupler 7 and the output end of Brillouin's pumping source 8
Connection, the second output terminal mouth of 3-dB coupler 7 are connect with the input port of spectrometer 9.
As the left side open loop of unilateral side feedback, the 3-dB coupler 7 of injection and laser output is pumped for Brillouin by one
Composition.Use tuning range for 970nm to 1680nm, output power range is the tunable laser source of 7.4dBm to 12.4dBm
As Brillouin's pumping source 8.
Straight right part is mainly the single mode optical fiber 4 (SMF) of the 10km of volume two, as brillouin gain medium, have with
The Rayleigh feedback of machine distribution, right end has an isolator, to avoid Fresnel reflection, it is ensured that stable Random Laser is defeated
Out.Circulator 6 connects left open loop with C port by the port A, connects right straight line portion by the port B.Brillouin is pumped through
After three-dB coupler 7,50% power injects the port B by the port A of circulator 6.In order to compensate for lower brillouin gain,
As common Brillouin's er-doped laser, 1.3 meters long of Er-doped fiber 3 is by two 980nm laser diode LD two-way pumps
It send, the peak power output of each diode is 500 milliwatts, is coupled in Er-doped fiber 3 by two wavelength division multiplexer 2WDM.
Model OSA or AQ-6370D, the spectroanalysis instrument 9 that resolution ratio is 0.02nm are monitored from 7 output port of 3-dB coupler
Output.
After Brillouin's pumping source 8 passes through three-dB coupler 7,50% power injects the port B by the port A of circulator 6.
When only open second 980nm in right side it is laser diode-pumped when, Brillouin's pump light is in right side second segment Er-doped fiber 3
Amplification, and propagated forward in the single mode optical fiber SMF of right side second segment 10km.When Brillouin's pumping light power is more than to be excited in cloth
When the scattering threshold value of deep pool, single order Brillouin stokes light is generated, Rayleigh scattering then provides random distribution feedback.The one of back-propagating
Rank stokes wave will be amplified for the first time by Er-doped fiber 3, and the output port of 50% stokes light from 3-dB coupler 7 is defeated
Out.Others are again introduced into after right side second segment Er-doped fiber 3 amplifies by left side open loop and reenter the right side as new pump light
Side single mode optical fiber 4.With the cascade of this process, high-order Brillouin's stokes light can produce.Finally mixed using Brillouin-
Erbium hybrid gain realizes multistage Stokes light generation in laser cavity, can be observed in the port on 5 right side of isolator double
The output of high-order Brillouin's stokes light of wavelength interval.
When only opening the first 980nm pumping source in left side, Brillouin's pump light is put in right side first segment Er-doped fiber 3
Greatly, and in the single mode optical fiber SMF of right side first segment 10km it propagates forward, similarly when Brillouin's pumping light power is more than to be excited
When Brillouin scattering threshold value, single order Brillouin's stokes light of back-propagating can be also generated, 50% after 3-dB coupler 7
Stokes light is exported from output port, and remaining be again introduced into right side first segment Er-doped fiber 3 by left side open loop carries out
Amplification generates high-order Brillouin stokes light, and the Brillouin of single times of wavelength interval output can be finally observed in spectrometer 9
Stokes light.
3 linear gain of Er-doped fiber is introduced in the bilateral port of circulator 6, Brillouin's pump light passes through 3-dB coupler 7
Injection, the port B of arrival circulator 6 are injected into long single mode optical fiber 4 again after first amplifying.Due to being excited cloth in single mode optical fiber 4
In the backward Stokes signal that generates of deep pool scattering, first amplify in Er-doped fiber 3, enter back into circulator 6, after part exports,
Enter Er-doped fiber 3 again by the port B of circulator 6 to amplify, then generates next stage stimulated Brillouin scattering.Pass through control
Cutting between single, double times of wavelength interval output may be implemented in the size of the switch and power of making two 980nm pump lasers
It changes.
Fig. 2 is the Random Laser output spectrum with 20 rank Brillouin's stokes lights.Fig. 3 is only to open first 980nm
Single times of wavelength interval output spectrum when Er-doped fiber pumps, the order generated when bp pump power is minimum is more, 980nm pump
When Pu power is smaller, Brillouin's stokes light of seldom rank can only be generated, as 980nm pump power increases, the cloth of generation
In deep stokes light order gradually increase.
Fig. 4 is double wavelength interval output spectrum when only opening second 980nm Er-doped fiber pumping, is observed when bp is pumped
Pu power generates more order, the function that Brillouin's stokes light order of generation is pumped with second 980nm in right side when larger
The increase of rate and increase, wherein when port is observed on the right side of the isolator in discovery output spectrum even-order Brillouin's Stokes
The output of light is suppressed and odd-order output is constant, therefore ultimately forms the output spectrum of double wavelength interval.
Claims (7)
1. a kind of changeable Brillouin-Er-doped fiber accidental laser in wavelength interval, it is characterised in that: the laser is
Half-open cavity configuration, including ring opening moiety, and the straight line portion connecting with ring opening moiety, the ring opening moiety pass through circulator
(6) it is connect with straight line portion；
In the ring opening moiety, the port A of circulator (6) is connect with the output port of 3-dB coupler (7), the C of circulator (6)
Port is connect with the input port of 3-dB coupler (7), another input port and Brillouin's pumping source of 3-dB coupler (7)
(8) output end connection, another output port of 3-dB coupler (7) are connect with the input port of spectrometer (9)；
The straight line portion includes two straight line units being connected, straight line units include pumping source (1), wavelength division multiplexer (2),
Er-doped fiber (3) and single mode optical fiber (4)；The output end of pumping source (1) is connect with the input terminal of wavelength division multiplexer (2), and wavelength-division is multiple
It is connect with the output end of device (2) with Er-doped fiber (3)；The other side of Er-doped fiber (3) is connect with one end of single mode optical fiber (4),
The other end of single mode optical fiber (4) is connect with the wavelength division multiplexer (2) of second straight line units；The single-mode optics of second straight line units
The other end of fine (4) is connect with isolator (5).
2. the changeable Brillouin-Er-doped fiber accidental laser in wavelength interval according to claim 1, feature exist
In: the circulator (6) is connected by the wavelength division multiplexer (2) of the port B and straight line portion.
3. the changeable Brillouin-Er-doped fiber accidental laser in wavelength interval according to claim 1, feature exist
In: the Er-doped fiber uses laser diode two directional pump mode so that reversed and forward direction Brillouin signal light can amplify.
4. the changeable Brillouin-Er-doped fiber accidental laser in wavelength interval according to claim 1, feature exist
In: after Brillouin's pumping source (8) passes through three-dB coupler (7), 50% power injects B by the port A of circulator (6)
Port.
5. the changeable Brillouin-Er-doped fiber accidental laser in wavelength interval according to claim 1, feature exist
In: Brillouin's pumping source (8) is that tuning range is 970nm~1680nm, and output power range is 7.4dBm~12.4dBm
Tunable laser source.
6. the changeable Brillouin-Er-doped fiber accidental laser in wavelength interval according to claim 1, feature exist
In: when the power of Brillouin's pump light is greater than stimulated Brillouin scattering threshold value, single order Brillouin stokes light is generated, it is auspicious
Benefit scattering then provides random distribution feedback；The single order stokes wave of back-propagating will be amplified for the first time by Er-doped fiber (3),
50% stokes light is exported from the output port of 3-dB coupler (7).
7. the changeable Brillouin-Er-doped fiber Random Laser in wavelength interval according to any one of claim 1 to 6
Device, it is characterised in that: the pumping source (1) is laser diode.
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| US20220149583A1 (en) * | 2020-11-09 | 2022-05-12 | Sichuan Guangsheng Iot Technology Co., Ltd. | Narrow-band, Low-noise Raman Fiber Laser with A Random Fiber Laser Pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220149583A1 (en) * | 2020-11-09 | 2022-05-12 | Sichuan Guangsheng Iot Technology Co., Ltd. | Narrow-band, Low-noise Raman Fiber Laser with A Random Fiber Laser Pump |
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