CN110994341B - Feedback enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser - Google Patents

Feedback enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser Download PDF

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CN110994341B
CN110994341B CN201911079930.XA CN201911079930A CN110994341B CN 110994341 B CN110994341 B CN 110994341B CN 201911079930 A CN201911079930 A CN 201911079930A CN 110994341 B CN110994341 B CN 110994341B
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optical fiber
polarization
fiber
laser
beam combiner
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CN110994341A (en
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徐鹏柏
高震森
董新永
杨军
王云才
秦玉文
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Guangdong University of Technology
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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
    • 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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/08086—Multiple-wavelength emission
    • H01S3/0809—Two-wavelenghth emission
    • 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
    • H01S3/1305—Feedback control systems
    • 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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  • Electromagnetism (AREA)
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  • Optics & Photonics (AREA)
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  • Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention discloses a feedback enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser which comprises a pumping laser light source, a fiber wavelength division multiplexer, a first fiber polarization controller, a first fiber polarization beam combiner, a polarization-maintaining erbium-doped fiber, a second fiber polarization beam combiner, a fiber laser, a first fiber coupler, a second fiber polarization controller, a first fiber isolator, a third fiber polarization controller, an electro-optic modulator, an arbitrary waveform generator, a fourth fiber polarization controller, a second fiber isolator, a second fiber coupler and the like. The random laser generates random Brillouin dynamic grating in one axis of the polarization maintaining erbium-doped fiber, and pumps in the other axis of the polarization maintaining erbium-doped fiber. The random Brillouin dynamic grating enhances the random feedback of the polarization maintaining optical fiber, so that two axes of the polarization maintaining optical fiber respectively generate random laser output, and the method has the advantages of high integration level, low threshold value and high conversion efficiency.

Description

Feedback enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser
Technical Field
The invention relates to the technical field of optics, in particular to a feedback enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser.
Background
Since the concept of random laser was proposed by Basov et al in the last 60 s, random lasers became the focus of research in academia. Unlike conventional lasers, random lasers do not have a fixed reflective cavity, the feedback paths are randomly distributed, and the gain medium can be powder, polymer, fuel, or biological tissue, among others. Random lasers have low temporal and spatial coherence and are ideal light sources for optical coherence tomography. However, such random lasers do not have directivity and have high pumping threshold, which severely limits their development.
In 2010, Turitsyn et al proposed a random laser based on standard single mode fiber that utilized Rayleigh scattering to provide random optical feedback and stimulated Raman scattering to provide gain. Different from the traditional laser, the waveguide structure of the single-mode fiber can well limit the Rayleigh scattering direction, so that the random fiber laser has better directivity and higher output. Subsequently, fiber random lasers have been extensively studied in terms of their implementation, multiple wavelengths, tunability, and the like. The gain of the fiber random laser may be provided by stimulated raman scattering, stimulated brillouin scattering or active fiber, and the random feedback may be provided by rayleigh scattering and weak reflection gratings. The threshold of the random laser based on the stimulated Raman scattering principle is higher than that of the random laser based on the stimulated Brillouin scattering or the active fiber, and the random feedback based on the Rayleigh scattering is weaker than that provided by the weak reflection grating, so that the threshold of the random laser providing gain based on the stimulated Raman scattering principle or random feedback based on the Rayleigh scattering is relatively higher, and the conversion efficiency is lower. Therefore, it is necessary to provide a random fiber laser having a low threshold and a high conversion efficiency.
Disclosure of Invention
Aiming at the defects of high threshold value, low conversion efficiency and weak random feedback of the conventional optical fiber random laser, the invention aims to provide a feedback enhanced polarization-maintaining erbium-doped optical fiber dual-wavelength random laser which provides gain for random laser by utilizing erbium ions and provides random feedback by utilizing a Brillouin dynamic grating.
In order to realize the task, the invention adopts the following technical scheme:
a feedback enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser comprises a pumping laser light source, a fiber wavelength division multiplexer, a first fiber polarization controller, a first fiber polarization beam combiner, a polarization-maintaining erbium-doped fiber, a second fiber polarization beam combiner, a fiber laser, a first fiber coupler, a second fiber polarization controller, a first fiber isolator, a third fiber polarization controller, an electro-optic modulator, an arbitrary waveform generator, a fourth fiber polarization controller, a second fiber isolator and a second fiber coupler;
the pump laser light source is connected with the input end of the optical fiber wavelength division multiplexer, the output end of the optical fiber wavelength division multiplexer is connected with the input end of the first optical fiber polarization controller, the output end of the first optical fiber polarization controller is connected with the first incident end of the first optical fiber polarization beam combiner, the emergent end of the first optical fiber polarization beam combiner is connected with one end of the polarization-maintaining erbium-doped optical fiber, and the other end of the polarization-maintaining erbium-doped optical fiber is connected with the emergent end of the second optical fiber polarization beam combiner;
the optical fiber laser is connected with the input end of the first optical fiber coupler, and the output end of the first optical fiber coupler is respectively connected with the second optical fiber polarization controller and the third optical fiber polarization controller; the second optical fiber polarization controller is connected with the input end of the first optical fiber isolator, and the output end of the first optical fiber isolator is connected with the second incident end of the first optical fiber polarization beam combiner;
the output end of the second optical fiber isolator is connected with the first incident end of the second optical fiber coupler, and the emergent end of the second optical fiber coupler is connected with the first incident end of the second optical fiber polarization beam combiner.
Furthermore, the polarization-maintaining erbium-doped fiber has two axes, laser entering the first fiber polarization beam combiner from the first incident end enters the first axis of the polarization-maintaining erbium-doped fiber from the exit end of the first fiber polarization beam combiner; the laser entering the first optical fiber polarization beam combiner from the second incident end enters the second axis of the polarization-maintaining erbium-doped optical fiber from the emergent end of the first optical fiber polarization beam combiner;
and the laser entering the second optical fiber polarization beam combiner from the first incident end of the second optical fiber polarization beam combiner enters the second axis of the polarization-maintaining erbium-doped optical fiber from the emergent end of the second optical fiber polarization beam combiner.
Further, a second incident end of the second optical fiber polarization beam combiner outputs first wavelength laser; and the second incident end of the second optical fiber coupler outputs second wavelength laser.
Further, the laser generated by the fiber laser is divided into an upper path and a lower path by the first fiber coupler, wherein:
after passing through the second optical fiber polarization controller and the first optical fiber isolator, the upper path laser enters the first optical fiber polarization beam combiner from the second incident end of the first optical fiber polarization beam combiner, and enters the second axis of the polarization-maintaining erbium-doped optical fiber from the emergent end of the first optical fiber polarization beam combiner;
the lower path of laser enters the electro-optical modulator through the third optical fiber polarization controller, is modulated by an electric signal of which the frequency generated by the arbitrary waveform generator changes randomly near the Brillouin frequency shift of the polarization-maintaining erbium-doped fiber, the output laser enters the second optical fiber polarization beam combiner from the first incident end of the second optical fiber polarization beam combiner after passing through the second optical fiber polarization controller to adjust the polarization state, enters the second axis of the polarization-maintaining erbium-doped fiber through the output end of the second optical fiber polarization beam combiner, and generates an interference effect in the second axis of the polarization-maintaining erbium-doped fiber together with the upper path of laser entering the second axis of the polarization-maintaining erbium-doped fiber from the second incident end of the first optical fiber polarization beam combiner to generate a Brillouin dynamic grating with spatially random distribution and reflectivity.
Furthermore, after passing through the optical fiber wavelength division multiplexer, the pump laser generated by the pump laser light source is adjusted in polarization state by the first optical fiber polarization controller, enters the first optical fiber polarization beam combiner through the first incident end of the first optical fiber polarization beam combiner, enters the first axis of the polarization-maintaining erbium-doped optical fiber (5) from the emergent end of the first optical fiber polarization beam combiner, and the Er in the polarization-maintaining erbium-doped optical fiber3+Absorbing the transition of the pumping laser to a high energy level to generate spontaneous radiation and provide gain; meanwhile, because the polarization-maintaining erbium-doped fiber has the Brillouin dynamic grating with random space distribution and random reflectivity, random feedback light can be generated and amplified and then generated; the oscillation is repeated in this way, a stimulated process is formed, and random laser output is generated.
The invention has the following technical characteristics:
1. the polarization-maintaining erbium-doped fiber is used as a carrier of a gain medium and a random feedback medium, and has the advantages of high integration level, low threshold value and high conversion efficiency.
2. The invention provides a method for enhancing random feedback by using a Brillouin dynamic grating with random spatial distribution and random reflectivity, which does not need to write the grating and has the advantages of quick reconstruction and variable grating length and reflectivity.
3. The invention provides a polarization-maintaining erbium-doped fiber for generating dual-wavelength random laser, and the wavelength is tunable.
Drawings
Fig. 1 is a schematic structural diagram of a feedback-enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser according to the present invention.
The reference numbers in the figures illustrate: the device comprises a pump laser light source 1, an optical fiber wavelength division multiplexer 2, a first optical fiber polarization controller 3, a first optical fiber polarization beam combiner 4, a polarization-maintaining erbium-doped optical fiber 5, a second optical fiber polarization beam combiner 6, an optical fiber laser 7, a first optical fiber coupler 8, a second optical fiber polarization controller 9, a first optical fiber isolator 10, a third optical fiber polarization controller 11, an electro-optical modulator 12, an arbitrary waveform generator 13, a fourth optical fiber polarization controller 14, a second optical fiber isolator 15 and a second optical fiber coupler 16.
Detailed Description
The invention discloses a feedback enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser, which generates a random Brillouin dynamic grating in one axis of a polarization-maintaining erbium-doped fiber 5 and pumps in the other axis of the polarization-maintaining erbium-doped fiber 5 so as to generate dual-wavelength random laser output and has the advantages of high integration level, low threshold value and high conversion efficiency; the random laser comprises a pump laser light source 1, an optical fiber wavelength division multiplexer 2, a first optical fiber polarization controller 3, a first optical fiber polarization beam combiner 4, a polarization-maintaining erbium-doped optical fiber 5, a second optical fiber polarization beam combiner 6, an optical fiber laser 7, a first optical fiber coupler 8, a second optical fiber polarization controller 9, a first optical fiber isolator 10, a third optical fiber polarization controller 11, an electro-optical modulator 12, an arbitrary waveform generator 13, a fourth optical fiber polarization controller 14, a second optical fiber isolator 15 and a second optical fiber coupler 16;
the pump laser light source 1 is connected with the input end of the optical fiber wavelength division multiplexer 2, the output end of the optical fiber wavelength division multiplexer 2 is connected with the input end of the first optical fiber polarization controller 3, the output end of the first optical fiber polarization controller 3 is connected with the first incident end of the first optical fiber polarization beam combiner 4, the emergent end of the first optical fiber polarization beam combiner 4 is connected with one end of the polarization-maintaining erbium-doped optical fiber 5, and the other end of the polarization-maintaining erbium-doped optical fiber 5 is connected with the emergent end of the second optical fiber polarization beam combiner 6;
the polarization-maintaining erbium-doped fiber 5 is provided with two axes, laser entering the first fiber polarization beam combiner 4 from a first incident end enters a first axis of the polarization-maintaining erbium-doped fiber 5 from an emergent end of the first fiber polarization beam combiner 4; the laser entering the second fiber polarization beam combiner 6 from the first incident end of the second fiber polarization beam combiner 6 enters the second axis of the polarization-maintaining erbium-doped fiber 5 from the exit end of the second fiber polarization beam combiner 6.
The optical fiber laser 7 is connected with the input end of a first optical fiber coupler 8, and the output end of the first optical fiber coupler 8 is respectively connected with a second optical fiber polarization controller 9 and a third optical fiber polarization controller 11; the second optical fiber polarization controller 9 is connected with the input end of the first optical fiber isolator 10, the output end of the first optical fiber isolator 10 is connected with the second incident end of the first optical fiber polarization beam combiner 4, correspondingly, the laser entering the first optical fiber polarization beam combiner 4 from the second incident end finally enters the second axis of the polarization-maintaining erbium-doped optical fiber 5 from the exit end of the first optical fiber polarization beam combiner 4.
The third optical fiber polarization controller 11 is connected with an input end of an electro-optical modulator 12, the arbitrary waveform generator 13 is connected to the electro-optical modulator, an output end of the electro-optical modulator 12 is connected with an input end of a fourth optical fiber polarization controller 14, an output end of the fourth optical fiber polarization controller 14 is connected with an input end of a second optical fiber isolator 15, an output end of the second optical fiber isolator 15 is connected with a first incident end of a second optical fiber coupler 16, and an exit end of the second optical fiber coupler 16 is connected with a first incident end of a second optical fiber polarization beam combiner 6. A second incident end of the second optical fiber polarization beam combiner 6 outputs first wavelength laser; the second incident end of the second optical fiber coupler 16 outputs laser light of the second wavelength.
When the feedback enhanced polarization-maintaining erbium-doped fiber 5 dual-wavelength random laser provided by the invention works, laser generated by the fiber laser 7 is divided into an upper laser and a lower laser by the first fiber coupler 8, wherein:
after passing through the second optical fiber polarization controller 9 and the first optical fiber isolator 10, the upper path laser enters the first optical fiber polarization beam combiner 4 from the second incident end of the first optical fiber polarization beam combiner 4, and enters the second axis of the polarization-maintaining erbium-doped optical fiber 5 from the exit end of the first optical fiber polarization beam combiner 4;
the lower path laser enters the electro-optical modulator 12 after passing through the third optical fiber polarization controller 11, is modulated by an electrical signal of which the frequency generated by the arbitrary waveform generator 13 changes randomly near the brillouin frequency shift of the polarization-maintaining erbium-doped fiber 5, the output laser is subjected to polarization state adjustment by the fourth optical fiber polarization controller 14, passes through the second optical fiber isolator 15 and the second optical fiber coupler 16, enters the second optical fiber polarization beam combiner 6 from the first incident end of the second optical fiber polarization beam combiner 6, enters the second axis of the polarization-maintaining erbium-doped optical fiber 5 through the output end of the second optical fiber polarization beam combiner 6, and generates interference effect with the upper laser entering the second axis of the polarization-maintaining erbium-doped fiber 5 from the second incident end of the first fiber polarization beam combiner 4, so as to generate the Brillouin dynamic grating with random space distribution and random reflectivity.
On the other hand, after passing through the optical fiber wavelength division multiplexer 2, the pump laser generated by the pump laser light source 1 is adjusted in polarization state by the first optical fiber polarization controller 3, enters the first optical fiber polarization beam combiner 4 through the first incident end of the first optical fiber polarization beam combiner 4, enters the first axis of the polarization-maintaining erbium-doped fiber 5 from the emergent end of the first optical fiber polarization beam combiner 4, and the erbium ion Er in the polarization-maintaining erbium-doped fiber 53+Absorbing the transition of the pumping laser to a high energy level to generate spontaneous radiation and provide gain; meanwhile, because the polarization-maintaining erbium-doped fiber 5 has the Brillouin dynamic grating with random space distribution and random reflectivity, random feedback light can be generated and amplified and then generated; so repeatedly vibrateAnd (4) forming a stimulated process to generate random laser output. Both axes of the polarization-maintaining erbium-doped fiber 5 generate random laser light, the wavelength of the random laser light corresponds to the central wavelength of the random Brillouin dynamic grating, and the difference value of the two wavelengths is related to the difference value of the refractive indexes of the two axes of the polarization-maintaining erbium-doped fiber 5.
As shown in fig. 1, in the technical solution of the present invention, the optical fiber wavelength division multiplexer 2 can be replaced with 1480/1550nm wavelength division multiplexer, meanwhile, the pump laser light source 1 can be replaced with 1480 pump source, the polarization maintaining erbium-doped fiber 5 can be replaced with polarization maintaining ytterbium-doped fiber, and the polarization maintaining erbium-doped fiber 5 can be replaced with bow-tie, panda, type polarization maintaining fiber or polarization maintaining photonic crystal fiber; the electro-optic modulator 12 may instead be a single sideband modulator; the arbitrary waveform generator 13 may output other types of random electrical signals to generate random brillouin dynamic gratings; the generation of the pump laser and the random brillouin dynamic grating may be interchanged in both axes of the polarization-maintaining erbium-doped fiber 5.
Based on the technical scheme, compared with the existing similar laser, the feedback enhanced polarization-maintaining erbium-doped fiber 5 dual-wavelength random laser provided by the invention has the following advantages:
the invention integrates the gain medium and the random feedback medium into a whole, and has high integration level; the random Brillouin dynamic grating provided by the invention has variable length and variable grating reflectivity; can generate dual-wavelength random laser and has tunable wavelength.
The invention adopts the polarization-maintaining erbium-doped fiber 5 as a carrier of a gain medium and a random feedback medium, adopts the random Brillouin dynamic grating to enhance random feedback and generates random laser with dual wavelengths. The invention does not need to write fiber gratings, adopts the random Brillouin dynamic grating to enhance the random feedback, and has the advantages of quick reconstruction and adjustable grating length and reflectivity.
The invention adopts the Brillouin dynamic grating to provide enhanced random feedback, adopts erbium ions to provide gain, and has lower threshold of the random laser.

Claims (5)

1. A feedback enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser is characterized by comprising a pumping laser light source (1), a fiber wavelength division multiplexer (2), a first fiber polarization controller (3), a first fiber polarization beam combiner (4), a polarization-maintaining erbium-doped fiber (5), a second fiber polarization beam combiner (6), a fiber laser (7), a first fiber coupler (8), a second fiber polarization controller (9), a first fiber isolator (10), a third fiber polarization controller (11), an electro-optic modulator (12), an arbitrary waveform generator (13), a fourth fiber polarization controller (14), a second fiber isolator (15) and a second fiber coupler (16);
the pump laser light source (1) is connected with the input end of the optical fiber wavelength division multiplexer (2), the output end of the optical fiber wavelength division multiplexer (2) is connected with the input end of the first optical fiber polarization controller (3), the output end of the first optical fiber polarization controller (3) is connected with the first incident end of the first optical fiber polarization beam combiner (4), the emergent end of the first optical fiber polarization beam combiner (4) is connected with one end of the polarization-maintaining erbium-doped optical fiber (5), and the other end of the polarization-maintaining erbium-doped optical fiber (5) is connected with the emergent end of the second optical fiber polarization beam combiner (6);
the optical fiber laser (7) is connected with the input end of a first optical fiber coupler (8), and the output end of the first optical fiber coupler (8) is respectively connected with a second optical fiber polarization controller (9) and a third optical fiber polarization controller (11); the second optical fiber polarization controller (9) is connected with the input end of the first optical fiber isolator (10), and the output end of the first optical fiber isolator (10) is connected with the second incident end of the first optical fiber polarization beam combiner (4);
the third optical fiber polarization controller (11) is connected with the input end of the electro-optical modulator (12), the arbitrary waveform generator (13) is connected to the electro-optical modulator (12), the output end of the electro-optical modulator (12) is connected with the input end of the fourth optical fiber polarization controller (14), the output end of the fourth optical fiber polarization controller (14) is connected with the input end of the second optical fiber isolator (15), the output end of the second optical fiber isolator (15) is connected with the first incident end of the second optical fiber coupler (16), and the emergent end of the second optical fiber coupler (16) is connected with the first incident end of the second optical fiber polarization beam combiner (6).
2. The feedback-enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser according to claim 1, wherein the polarization-maintaining erbium-doped fiber (5) has two axes, and laser light entering the first fiber polarization beam combiner (4) from a first incident end enters a first axis of the polarization-maintaining erbium-doped fiber (5) from an exit end of the first fiber polarization beam combiner (4); the laser entering the first optical fiber polarization beam combiner (4) from the second incident end enters the second axis of the polarization-maintaining erbium-doped optical fiber (5) from the emergent end of the first optical fiber polarization beam combiner (4);
the laser entering the second optical fiber polarization beam combiner (6) from the first incident end of the second optical fiber polarization beam combiner (6) enters the second axis of the polarization-maintaining erbium-doped optical fiber (5) from the emergent end of the second optical fiber polarization beam combiner (6).
3. The feedback-enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser according to claim 1, wherein a second incident end of the second fiber polarization beam combiner (6) outputs first-wavelength laser light; and the second incident end of the second optical fiber coupler (16) outputs second wavelength laser.
4. The feedback-enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser as claimed in claim 2, wherein the laser light generated by the fiber laser (7) is divided into upper and lower laser lights by a first fiber coupler (8), wherein:
after passing through the second optical fiber polarization controller (9) and the first optical fiber isolator (10), the upper path laser enters the first optical fiber polarization beam combiner (4) from the second incident end of the first optical fiber polarization beam combiner (4), and enters the second axis of the polarization-maintaining erbium-doped optical fiber (5) from the emergent end of the first optical fiber polarization beam combiner (4);
the lower path of laser enters an electro-optical modulator (12) through a third optical fiber polarization controller (11), is modulated by an electric signal with the frequency randomly changing near the Brillouin frequency shift of the polarization-preserving erbium-doped optical fiber (5) generated by an arbitrary waveform generator (13), the polarization state of the output laser is adjusted through a fourth optical fiber polarization controller (14), the output laser enters a second optical fiber polarization beam combiner (6) from the first incident end of the second optical fiber polarization beam combiner (6) after passing through a second optical fiber isolator (15) and a second optical fiber coupler (16), and enters the second axis of the polarization-preserving erbium-doped optical fiber (5) through the output end of the second optical fiber polarization beam combiner (6) and generates an interference effect in the second axis of the polarization-preserving erbium-doped optical fiber (5) together with the upper path of laser entering the second axis of the polarization-doped optical fiber (5) from the second incident end of the first optical fiber polarization beam combiner (4), and generating the Brillouin dynamic grating with random space distribution and random reflectivity.
5. The feedback-enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser as claimed in claim 2, wherein the pump laser generated by the pump laser source (1) passes through the fiber wavelength division multiplexer (2), the polarization state of the pump laser is adjusted by the first fiber polarization controller (3), the pump laser enters the first fiber polarization beam combiner (4) through the first incident end of the first fiber polarization beam combiner (4), and then enters the first axis of the polarization-maintaining erbium-doped fiber (5) from the emergent end of the first fiber polarization beam combiner (4), and Er in the polarization-maintaining erbium-doped fiber (5) enters the first axis of the polarization-maintaining erbium-doped fiber (5)3+Absorbing the transition of the pump laser to a high energy level to generate spontaneous radiation and simultaneously generating random feedback light, amplifying the random feedback light and then generating random feedback; the oscillation is repeated in this way, a stimulated process is formed, and random laser output is generated.
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CN203850614U (en) * 2014-05-08 2014-09-24 中国计量学院 Multi-wavelength Brillouin-Er-doped fiber laser based on random distribution feedback
CN104078825A (en) * 2014-05-08 2014-10-01 中国计量学院 Multi-wavelength Brillouin-erbium-doped fiber laser based on random distribution feedback
CN105675031B (en) * 2016-01-23 2017-09-15 中国人民解放军国防科学技术大学 Brillouin optical time domain analysis instrument based on pre- pumping pulse and gray encoding
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