CN206697745U - A kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system - Google Patents
A kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system Download PDFInfo
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- CN206697745U CN206697745U CN201621144642.XU CN201621144642U CN206697745U CN 206697745 U CN206697745 U CN 206697745U CN 201621144642 U CN201621144642 U CN 201621144642U CN 206697745 U CN206697745 U CN 206697745U
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Abstract
The utility model discloses a kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system, including the resonator being made up of high reflectance chirped fiber grating, high-gain optical fiber, antiradar reflectivity chirped fiber grating, single mode semiconductor pump laser as pump light source, light wavelength division multiplexing, photo-coupler, optical circulator, etalon filter component；Pump light source carries out fibre core pumping to high-gain optical fiber.Optical filter assembly is entered by optical circulator by photo-coupler light splitting rear portion from the wide spectrum laser of light wavelength division multiplexing output, wavelength corresponding to the particular centre frequency filtered out by etalon, the laser is injected back into inside resonator by optical circulator and photo-coupler again, self-injection locking is carried out to resonator, narrow linewidth, the laser lasing of single-longitudinal-multi-wavelength multi-wavelength pattern are realized with reference to linear cavity resonator structure and its wave filter group, it is final to realize stable multi-wavelength output, meet multi-wavelength single-frequency laser output as defined in laser radar.
Description
Technical field
It the utility model is related to the fields such as laser radar, Fibre Optical Sensor, coherent swpectrum conjunction beam and can be especially useful for laser
A kind of Fiber laser technology that radar system is applied, and in particular to single frequency fiber LASER Light Source for exporting multi-wavelength narrow linewidth.
Background technology
Laser radar system includes a single beam narrow band laser and a reception system.Laser is generated and transmitted by a branch of
Light pulse, beat on object and reflect, finally received by receiver.Receiver accurately measures light pulse from being transmitted into
The propagation time being reflected back toward.Because light pulse is always received with light velocity propagation, receiver before next pulse is sent
To the previous pulse being reflected back toward.In view of the light velocity is known, the propagation time can be converted into the measurement adjusted the distance.With reference to
The height of laser, laser scanning angle, the position of the laser obtained from GPS and from the Laser emission direction that INS is obtained, just
The coordinate X, Y, Z of each ground hot spot can be calculated exactly.The frequency of radiating laser beams can be from several pulses per second
To tens of thousands of individual pulses per second.For example, a frequency is the system of 10,000 subpulse per second, and receiver will be in one minute
Record 600,000 points.In general, the ground hot spot spacing of laser radar system is in 2-4m.
Present laser radar system is mainly using single beam narrow band laser as transmitter, and its investigative range is small and speed is slow.It is more
Beam narrow band laser is capable of the investigative range of expansion of laser light radar, greatly shortens sweep speed.
Utility model content
The purpose of this utility model a kind of can be used for laser radar in overcoming the shortcomings of that prior art is above-mentioned, disclosing
The multi-wavelength narrow-linewidth single frequency fiber laser light source of system, filtered by self-injection locking structure combination short-term type resonator and light
Ripple device group realizes the multi-wavelength single frequency fiber LASER Light Source of all optical fibre structure together.
The purpose of this utility model is realized at least through one of following technical scheme.
A kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system, including a high reflectance chirp
Fiber grating, high-gain optical fiber, antiradar reflectivity chirped fiber grating, light wavelength division multiplexing, single mode semiconductor pump laser, light
Coupler, optoisolator, optical circulator, optical filter assembly, semiconductor optical amplifier.Structural relation between each part is：
Gain media of the high-gain optical fiber as compact-sized laserresonator, antiradar reflectivity chirped fiber grating and high reflectance Zhou
Fiber grating of singing forms the front and rear hysteroscope of laserresonator, realizes vibration of the laser in intracavitary.High reflectance chirped fiber grating,
High-gain optical fiber, antiradar reflectivity chirped fiber grating constitute the resonator of laser, and the laser of resonator output passes through optocoupler
Clutch rear portion light is entered in optical filter assembly by optical circulator, passes through the optical filter group with certain free spectrum width
Part carry out multiple centre frequencies corresponding to after wavelength selected, then via optical circulator and photo-coupler injection to return to laser humorous
Shake in chamber, with reference to the structure of compact short-term die cavity, it is corresponding that the resonator lasing after injection locks goes out multiple centre frequencies
The single frequency fiber laser of wavelength.Single-frequency laser signal enters photo-coupler via the signal end of light wavelength division multiplexing, then from light
The output end output of isolator.The laser signal of output carries out the excellent of noise suppressed and optical property via semiconductor optical amplifier
Change.
Further optimize, the optical filter assembly is that one kind goes to realize choosing by certain Free Spectral Range and bandwidth
The device of specific wavelength in light path system is selected by or prevented, two or several are included but is not limited in output wavelength
Specific wavelength of light exports.
Further optimize, the optical filter assembly is not limited to F-P wave filters, fiber grating filter and other types
Wave filter etc..
Further optimize, the optical fiber laser is compact short straight cavity structure, and its front cavity mirror is antiradar reflectivity chirp
Fiber grating, Effect of Back-Cavity Mirror use high reflectance chirped fiber grating；The reflectivity chirped fiber grating is to encouraging optical signal
Low anti-, reflectivity is 10% ~ 90%, a width of 1 ~ 40 nm of its 3dB reflectance spectrum.The high reflectance chirped fiber grating is to pumping
Light is high thoroughly, and transmissivity is more than 90%, and high anti-to excitation optical signal, and reflectivity is more than 95%, its 3dB reflectance spectrum a width of 1 ~ 40
nm。
Further optimize, the unit length gain of the high-gain optical fiber is more than 0.2 dB/cm, fiber lengths 0.5
~100 cm.
Compared with prior art, the utility model has the following advantages that and technique effect：The utility model can general centimetre
Gain media of the high-gain optical fiber of magnitude as laser, by antiradar reflectivity chirped fiber grating and high reflectance chirped fiber light
Grid form the front and rear hysteroscope of cavity resonator structure, under the continuous pump of single mode semiconductor laser pumping source, the high-gain in fibre core
Particle inverts, and produces the laser signal of stimulated emission, and the broad band laser signal of resonator output is latter by photo-coupler
Part light enters optical filter assembly by optical circulator, and several center frequencies are obtained after the longitudinal mode selection by optical filter assembly
The single longitudinal mode laser signal of rate corresponding wavelength, then injected back via optical circulator and photo-coupler in resonator, by noting certainly
Enter the single-frequency laser that the short-term die cavity can lasing after locking goes out wavelength corresponding to multiple centre frequencies.
Brief description of the drawings
Fig. 1 is that a kind of principle of the multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system in example is shown
It is intended to.
Embodiment
Specific embodiment of the present utility model is further described with specific example, it is necessary to illustrate below in conjunction with the accompanying drawings
Be the requires of the utility model protection scope be not limited to embodiment statement scope, if having below especially detailed description
Process or parameter, be that those skilled in the art can refer to prior art and realize.
Such as Fig. 1, a kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system, it is anti-that it includes a height
Penetrate rate chirped fiber grating 1, high-gain optical fiber 2, antiradar reflectivity chirped fiber grating 3, light wavelength division multiplexing 4, single mode semiconductor
Pump laser 5, photo-coupler 6, optoisolator 7, optical circulator 8, optical filter assembly 9, semiconductor optical amplifier 10.Each portion
Structural relation between part is：Gain media of the high-gain optical fiber 2 as compact-sized laserresonator, antiradar reflectivity chirp
Fiber grating 3 and high reflectance chirped fiber grating 1 form the front and rear hysteroscope of laserresonator, realize laser shaking in intracavitary
Swing.High reflectance chirped fiber grating 1, high-gain optical fiber 2, antiradar reflectivity chirped fiber grating 3 constitute the resonance of laser
Chamber, the laser of resonator output are entered in optical filter assembly 9 by optical circulator 8 by the rear portion light of photo-coupler 6, led to
Cross the optical filter assembly 9 with certain free spectrum width carry out multiple centre frequencies corresponding to after wavelength selected, then via
Optical circulator 8 and the injection of photo-coupler 6 are returned in laserresonator, with reference to the structure of compact short-term die cavity, by self seeding
Resonator lasing after locking goes out the single frequency fiber laser of wavelength corresponding to multiple centre frequencies.Single-frequency laser signal is via light wave
The signal end of division multiplexer 4 enters photo-coupler 6, is then exported from the output end of optoisolator 7.The flashlight of output is via half
Conductor image intensifer 10 carries out noise suppressed and optical property optimization.
Embodiment 1
The center reflection wavelength of high reflectance chirped fiber grating 1 of this example is laser output wavelength 1552.52 nm, 3dB
A width of 40 nm of reflectance spectrum, this example centre wavelength reflectivity are more than 99.95%.Antiradar reflectivity chirped fiber grating 3 couples output light
The center reflection wavelength of grid is the nm of laser output wavelength 1552.52, and its three dB bandwidth is 40 nm, and centre wavelength reflectivity is 10
~95%, this example centre wavelength penetrates rate as 60%.High reflectance chirped fiber grating 1 and antiradar reflectivity chirped fiber grating 3 into one
The individual functional module with wider spectral region selection and filter action.Wherein, high reflectance chirped fiber grating 1 and high increasing
Beneficial optical fiber 2 is connected with welding or end face docking mode；Optical fiber is used between high-gain optical fiber 2 and antiradar reflectivity chirped fiber grating 3
End surface grinding polishing is connected with hysteroscope closed butt joint mode.The light splitting ratio of photo-coupler is from 1：99 to 50：50, this example uses
Be 10：The photo-coupler 6 of 90 light splitting ratios.The optical filter assembly 9 that this example uses is F-P cavity etalon filter, and it is certainly
8 nm are reached by spectral region, three dB bandwidth is 0.02 nm, exports 4 corresponding wavelengths appeared in chirp grating bandwidth.
The pump mode of this example uses backward pump, and pump light is produced via light by single mode semiconductor pump laser 5
The pumping end of wavelength division multiplexer 4 inputs, and in the fibre core via antiradar reflectivity chirped fiber grating 3 to high-gain optical fiber 2, carries out fine
Core pumping.Gain particle in the continuous pumping fibre core of pump light, reaches population inversion, and stimulated emission produces laser letter
Number.The continuous optical signal of resonator output passes through 10：After 90 photo-coupler (6), 90% flashlight is entered by optical circulator 8
Enter in F-P etalon filters, then selected by adjustment criteria tool wave filter multiple single in low anti-chirp grating bandwidth
Multi-wavelength single-frequency laser signal is obtained after longitudinal mode, then is injected back via optical circulator 8 and photo-coupler (6) in resonator, is passed through
It is 1536.51 nm, 1544.64 nm, 1552.52 nm, 1560.36 nm list that resonator after self-injection locking, which produces wavelength,
Frequency laser signal.Laser signal enters photo-coupler (6), 10% single-frequency laser signal via the signal end of light wavelength division multiplexing 4
Exported from the output end of optoisolator (7), the single-frequency that four wavelength of low noise can be obtained by semiconductor optical amplifier 10 swashs
Light output.
Claims (5)
1. the multi-wavelength narrow-linewidth single frequency fiber laser light source of a kind of laser radar system, it is characterised in that anti-including a height
Penetrate rate chirped fiber grating (1), high-gain optical fiber (2), antiradar reflectivity chirped fiber grating (3), light wavelength division multiplexing (4), list
Mould semiconductor pump laser (5), photo-coupler (6), optoisolator (7), optical circulator（8）, optical filter assembly（9）With half
Conductor image intensifer（10）；Antiradar reflectivity chirped fiber grating (3) and high reflectance chirped fiber grating (1) composition laser resonance
The front and rear hysteroscope of chamber, realize vibration of the laser in intracavitary；Gain media of the high-gain optical fiber (2) as laserresonator；It is high anti-
Penetrate rate chirped fiber grating（1）, high-gain optical fiber（2）, antiradar reflectivity chirped fiber grating（3）Constitute laserresonator；By
Single mode semiconductor pump laser（5）Pump light is produced via light wavelength division multiplexing（4）Pumping end input, via antiradar reflectivity
Chirped fiber grating（3）To high-gain optical fiber（2）Fibre core in, carry out fibre core pumping；The laser of laserresonator output passes through
Photo-coupler（6）Rear portion light passes through optical circulator（8）Into optical filter assembly（9）In；The optical filter assembly（9）
For F-P wave filters or fiber grating filter；Pass through optical filter assembly（9）It is corresponding to carry out ITU-T regulation nominal center frequencies
Wavelength selected after, then via optical circulator（8）Returned to photo-coupler (6) injection in laserresonator, with reference to short-term
The structure of die cavity, the resonator lasing after self-injection locking go out wavelength corresponding to multiple ITU-T regulations nominal center frequencies
Single frequency fiber laser；Single frequency fiber laser signal is via light wavelength division multiplexing（4）Signal end enter photo-coupler（6）, light
Coupler（6）Another part light of output exports from the output end of optoisolator (7) again, and the multi-wavelength light of output passes through semiconductor
Image intensifer（10）Carry out noise suppressed.
2. a kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system according to claim 1, its
It is characterised by：The optical filter assembly（9）Include the combination of an optical filter or multiple optical filters in structure.
3. a kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system according to claim 1, its
It is characterised by：The fiber laser light source is short straight cavity structure.
4. a kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system according to claim 1, its
It is characterised by：The antiradar reflectivity chirped fiber grating（3）Low to excitation optical signal anti-, reflectivity reflects for 10% ~ 90%, 3dB
Spectrum width is 1 ~ 40 nm；The high reflectance chirped fiber grating（1）It is high to pump light that transmissivity is more than 90% thoroughly, and to excitation
Optical signal is high anti-, and reflectivity is more than a width of 1 ~ 40 nm of 95%, 3dB reflectance spectrums.
5. a kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system according to claim 1, its
It is characterised by：The high-gain optical fiber（2）Unit length gain be more than 0.2 dB/cm, fiber lengths are 0.5~100 cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621144642.XU CN206697745U (en) | 2016-10-21 | 2016-10-21 | A kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system |
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|---|---|---|---|
| CN201621144642.XU CN206697745U (en) | 2016-10-21 | 2016-10-21 | A kind of multi-wavelength narrow-linewidth single frequency fiber laser light source of laser radar system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233162A (en) * | 2017-12-29 | 2018-06-29 | 横琴东辉科技有限公司 | A kind of device for improving single frequency fiber laser signal-to-noise ratio in relevant optical tests |
| CN111025261A (en) * | 2019-11-19 | 2020-04-17 | 深圳市大族光通科技有限公司 | Laser radar light source and laser radar system |
| CN111509533A (en) * | 2019-01-31 | 2020-08-07 | 深圳大学 | Narrow linewidth single-frequency light source |
| CN111509534A (en) * | 2019-01-31 | 2020-08-07 | 深圳大学 | Narrow linewidth single-frequency laser light source |
| CN111711061A (en) * | 2020-06-29 | 2020-09-25 | 华南理工大学 | Dual-wavelength all-fiber laser |
| CN114256722A (en) * | 2020-09-23 | 2022-03-29 | 中国科学院半导体研究所 | On-chip integrated narrow linewidth laser |
-
2016
- 2016-10-21 CN CN201621144642.XU patent/CN206697745U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233162A (en) * | 2017-12-29 | 2018-06-29 | 横琴东辉科技有限公司 | A kind of device for improving single frequency fiber laser signal-to-noise ratio in relevant optical tests |
| CN111509533A (en) * | 2019-01-31 | 2020-08-07 | 深圳大学 | Narrow linewidth single-frequency light source |
| CN111509534A (en) * | 2019-01-31 | 2020-08-07 | 深圳大学 | Narrow linewidth single-frequency laser light source |
| CN111025261A (en) * | 2019-11-19 | 2020-04-17 | 深圳市大族光通科技有限公司 | Laser radar light source and laser radar system |
| CN111711061A (en) * | 2020-06-29 | 2020-09-25 | 华南理工大学 | Dual-wavelength all-fiber laser |
| CN114256722A (en) * | 2020-09-23 | 2022-03-29 | 中国科学院半导体研究所 | On-chip integrated narrow linewidth laser |
| CN114256722B (en) * | 2020-09-23 | 2023-09-05 | 中国科学院半导体研究所 | On-Chip Integrated Narrow Linewidth Laser |
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