CN110233413A - A kind of multi-Wavelength Pulses optical fiber laser and laser radar system - Google Patents
A kind of multi-Wavelength Pulses optical fiber laser and laser radar system Download PDFInfo
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- CN110233413A CN110233413A CN201910598574.6A CN201910598574A CN110233413A CN 110233413 A CN110233413 A CN 110233413A CN 201910598574 A CN201910598574 A CN 201910598574A CN 110233413 A CN110233413 A CN 110233413A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
-
- 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
- H01S3/06—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
-
- 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
-
- 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
-
- 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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
-
- 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
- H01S3/10084—Frequency control by seeding
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Lasers (AREA)
Abstract
The embodiment of the invention discloses a kind of multi-Wavelength Pulses optical fiber laser and laser radar systems.Multi-Wavelength Pulses optical fiber laser includes seed light source module, pumping source and at least one level optic fiber amplifying module, the pumping input terminal of all optic fiber amplifying modules is connect with pumping source, and the output end of seed light source module is connect with the input terminal of first order optic fiber amplifying module；Seed light source module is used to issue the pulse laser of at least two different wave lengths, including at least two laser chips, each laser chip is connect with an output optical fibre, and each laser chip issues a kind of pulse laser of wavelength, and integral packaging is in seed light source module；Pumping source is used to provide energy for optic fiber amplifying module；Optic fiber amplifying module is used to amplify the pulse laser of seed light source module generation, and amplified pulse laser is exported.The technical solution of the embodiment of the present invention may be implemented multi-Wavelength Pulses output, and have the advantages that structure is simple, small in size, at low cost, performance is stable.
Description
Technical field
The present embodiments relate to laser technology more particularly to a kind of multi-Wavelength Pulses optical fiber laser and laser radar systems
System.
Background technique
Compared with ordinary light source, the laser that laser issues has that monochromaticjty is good, brightness is high, good directionality etc. is many excellent
Point is widely used in fields such as laser marking, cutting, ranging, communications.
Laser is divided into continuous wave laser and pulse laser from operation.Pulse laser refers to single laser pulse width
Degree less than 0.25 second, just work primary laser at interval of certain time, it is with biggish peak power.Such as it is communicating
In systematic difference, single wavelength laser has been unable to meet the demand of people since bandwidth is limited, in order to further increase communication
Bandwidth and capacity, wavelength-division multiplex technique are widely used.
In the application of laser radar, the laser radar of nearby vehicle emits the laser signal of wavelength same as this vehicle, thunder
Up to being difficult to differentiate between.On same road, if having more be fitted with transmitting phase co-wavelength laser radar vehicle at a distance of compared with
When close, these laser radars may receive the light pulse of other radars sending, therefore, it is determined that being target echo, that is, cause this
Platform radar is disturbed to lead to error detector.Existing laser radar generally using radar field of view angle is reduced, reduces photosensitive array face
The modes such as product avoid the interference of external optical signal.But such measure to the interference signals of other co-wavelength laser radars almost
In vain.It, can be in conjunction with wavelength-division multiplex technique, using the pulse laser of multi-wavelength in order to improve the interference free performance of laser radar
Device.The light source most straightforward approach of wavelength-division multiplex system is exactly to use multiple single wavelength lasers, but pass through simple increase
Quantity of light source meets the increased needs of the number of channel, will definitely increase the cost and complexity of system, therefore, how to obtain performance
Stable multiwavelength laser pulse, becomes the research hotspot in present laser field.
Summary of the invention
The embodiment of the present invention provides a kind of multi-Wavelength Pulses optical fiber laser and laser radar system, to realize multi-wavelength arteries and veins
Punching output, and have the advantages that structure is simple, small in size, at low cost, performance is stable.
In a first aspect, the embodiment of the present invention provides a kind of multi-Wavelength Pulses optical fiber laser, comprising:
Seed light source module, pumping source and at least one level optic fiber amplifying module, the pump of all optic fiber amplifying modules
Pu input terminal is connect with the pumping source, optic fiber amplifying module described in the output end and the first order of the seed light source module
Input terminal connection；
The seed light source module is used to issue the pulse laser of at least two different wave lengths, the seed light source module packet
At least two laser chips are included, each laser chip is connect with an output optical fibre, and each laser chip issues one
The pulse laser of kind wavelength, and integral packaging is in the seed light source module；
The pumping source is used to provide energy for the optic fiber amplifying module；
The optic fiber amplifying module is used to amplify the pulse laser that the seed light source module generates, and by amplified arteries and veins
Impulse light output.
Optionally, including at least two-stage optic fiber amplifying module；At least optic fiber amplifying module described in two-stage is arranged in series.
Optionally, optic fiber amplifying module described in the first order includes the first wavelength division multiplexer, the first optoisolator, the first gain
Optical fiber and the first pump combiner；
First wavelength division multiplexer includes at least two input terminals and an output end, described in each input terminal and one
The output optical fibre of laser chip connects, and output end is connect with the input terminal of first optoisolator；
The output end of first optoisolator pass through first gain fibre and first pump combiner the
The connection of one input terminal；Or the output end of first optoisolator and the first input end of first pump combiner connect
It connects, the output end of first pump combiner is connect with first gain fibre；
Second input terminal of first pump combiner is connect with the pumping source；
Optic fiber amplifying module described in afterbody includes the second wavelength division multiplexer, the second optoisolator, at least two section second
Gain fibre, at least two second pump combiners, the first beam splitter and at least two third optoisolators, wherein described second
Wavelength division multiplexer includes an input terminal and at least two output ends, and first beam splitter includes an input terminal and at least two
A output end, the output end quantity of first beam splitter, second wavelength division multiplexer output end quantity, described second
The quantity of the quantity of pump combiner, the quantity of second gain fibre and the third optoisolator with the seed light
The quantity of laser chip is identical in source module；
The output end of optic fiber amplifying module described in the input terminal and previous stage of second optoisolator connects, and described second
The output end of optoisolator is connect with the input terminal of second wavelength division multiplexer；
The input terminal of first beam splitter is connect with the pumping source；
The first input end of second pump combiner passes through second gain fibre and second wavelength-division multiplex
Each output end of device connects one to one, and the second input terminal of second pump combiner is every with first beam splitter
A output end connects one to one, and the input terminal of the output end of second pump combiner and the third optoisolator connects
It connects；Or each output end one-to-one correspondence of the first input end of second pump combiner and second wavelength division multiplexer
Connection, the second input terminal of second pump combiner and each output end of first beam splitter connect one to one,
The output end of second pump combiner is connect with the input terminal of second gain fibre, second gain fibre it is defeated
Outlet is connect with the input terminal of the third optoisolator.
Optionally, further include at least one filter, the filter be set to optic fiber amplifying module described in previous stage and
Between optic fiber amplifying module described in rear stage, the output end of optic fiber amplifying module described in the input terminal and previous stage of the filter
It connects, the input terminal connection of optic fiber amplifying module described in the output end and rear stage of the filter.
Optionally, optic fiber amplifying module described in afterbody further includes at least two collimators, each collimator with
One output end of optic fiber amplifying module described in afterbody connects.
Optionally, first gain fibre and second gain fibre are the doping light for adulterating identical rare earth element
It is fine.
It optionally, further include the second beam splitter, the input terminal of second beam splitter and the output end of the pumping source connect
It connecing, the first output end of second beam splitter is connect with the second input terminal of first pump combiner, and described second point
The second output terminal of beam device is connect with the input terminal of first beam splitter.
Optionally, the seed light source module further includes at least two collimation lenses, the collimation lens and the laser
Chip corresponds, and is set between the laser chip and the output optical fibre, and the collimation lens is used for the laser
The pulse laser of chip output is coupled into the output optical fibre.
Second aspect, the embodiment of the present invention also provide a kind of laser radar system, any described more including first aspect
Wavelength pulse optical fiber laser.
It optionally, further include light receiving unit and signal processing unit；
The light receiving unit includes a wavelength-division device and the photodetection for being set to each output end of wavelength-division device
Module；
The wavelength-division device includes at least two wavelength division modules, and each wavelength division module only transmits a kind of light of wavelength,
And the light of other wavelength is reflexed into next wavelength division module.
Multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention, including seed light source module, pumping source and extremely
Few level-one optic fiber amplifying module, the pumping input terminal of all optic fiber amplifying modules are connect with pumping source, seed light source module
Output end is connect with the input terminal of first order optic fiber amplifying module；Seed light source module is for issuing at least two different wave lengths
Pulse laser, seed light source module include at least two laser chips, and each laser chip is connect with an output optical fibre, each
Laser chip issues a kind of pulse laser of wavelength, and integral packaging is in seed light source module；Pumping source for optical fiber for putting
Big module provides energy；Optic fiber amplifying module is used to amplify the pulse laser of seed light source module generation, and by amplified arteries and veins
Impulse light output.It, can be with by the way that the laser chip integral packaging of different wave length pulse laser will be issued in seed light source module
So that seed light source module is exported the pulse laser of at least two different wave lengths, is simultaneously all fiber amplifiers by a pumping source
Module provides pump light, can simplify the structure of laser, reduces cost；Pass through a seed light source module output at least two
Wavelength, realizes the pulse laser output of multi-wavelength, and has the advantages that structure is simple, small in size, at low cost, performance is stable.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention；
Fig. 2 is a kind of partial structural diagram of seed light source module provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention；
Fig. 4~Fig. 6 is the structural representation of another multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention respectively
Figure；
Fig. 7 is the structural schematic diagram of another multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of another multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention；
Fig. 9 is the structural schematic diagram of another multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention；
Figure 10 is a kind of structural schematic diagram of laser radar system provided in an embodiment of the present invention；
Figure 11 is a kind of structural schematic diagram of wavelength-division device provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments
The present invention.It should be noted that the nouns of locality such as "upper", "lower" described in the embodiment of the present invention, "left", "right" are with attached drawing institute
The angle shown should not be construed as the restriction to the embodiment of the present invention come what is be described.Furthermore within a context, it is also necessary to understand
, when mentioning an element and being formed on "above" or "below" another element, another can not only be formed directly into
Perhaps "lower" can also be indirectly formed by intermediary element in another element "upper" or "lower" for element "upper".Term " first ",
" second " etc. is used for description purposes only, and is not offered as any sequence, quantity or importance, and is used only to distinguish different groups
At part.For the ordinary skill in the art, above-mentioned term in the present invention specific can be understood with concrete condition
Meaning.
The embodiment of the present invention provides a kind of multi-Wavelength Pulses optical fiber laser, which includes:
Seed light source module, pumping source and at least one level optic fiber amplifying module, the pumping input terminal of all optic fiber amplifying modules with
Pumping source connection, the output end of seed light source module are connect with the input terminal of first order optic fiber amplifying module；Seed light source module
For issuing the pulse laser of at least two different wave lengths, seed light source module includes at least two laser chips, each laser
Chip is connect with an output optical fibre, and each laser chip issues a kind of pulse laser of wavelength, and integral packaging is in seed light
In source module；Pumping source is used to provide energy for optic fiber amplifying module；Optic fiber amplifying module is for amplifying the production of seed light source module
Raw pulse laser, and amplified pulse laser is exported.
It is understood that seed light source module is used to generate the pulse lasers of at least two different wave lengths, wherein laser
Chip can be semiconductor laser chip, and all laser chips are all encapsulated in seed light source module, due to semiconductor material pair
Temperature is sensitive, when it is implemented, can also in seed light source module encapsulation temperature sensor and temperature control device, to improve seed
The output stability of light source module.According to the pulse power to be exported, the quantity of optic fiber amplifying module can choose, such as export
When power is tens or several hundred milliwatts, level-one can be selected to amplify, when output power is watt magnitude, second level can be selected to amplify
Deng.Pumping source can be multimode semiconductor laser.
It illustratively, include level-one optic fiber amplifying module with multi-Wavelength Pulses optical fiber laser, seed light source module includes
For three laser chips, the structure that Fig. 1 show a kind of multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention is shown
It is intended to.With reference to Fig. 1, multi-Wavelength Pulses optical fiber laser provided in this embodiment include seed light source module 1, pumping source 2 and
The pumping input terminal of optic fiber amplifying module 3, optic fiber amplifying module 3 is connect with pumping source 2, the output end of seed light source module 1 with
The input terminal of optic fiber amplifying module 3 connects；Seed light source module 1 include at least three laser chips 11, each laser chip with
A piece output optical fibre 12 connects, and each laser chip 11 issues a kind of pulse laser of wavelength, and integral packaging is in seed light source
In module 1；Pumping source 2 is used to provide energy for optic fiber amplifying module 3；Optic fiber amplifying module 3 is for amplifying seed light source module 1
The pulse laser of generation, and amplified pulse laser is exported.
Optionally, seed light source module further includes at least two collimation lenses, and collimation lens and laser chip correspond,
It is set between laser chip and output optical fibre, collimation lens is used to the pulse laser that laser chip exports being coupled into output light
It is fine.
Illustratively, Fig. 2 show a kind of partial structural diagram of seed light source module provided in an embodiment of the present invention.
With reference to Fig. 2, seed light source module further includes collimation lens 13, is set between laser chip 11 and output optical fibre 12, and collimation is saturating
Mirror is used to 11 reproduced pulse laser coupled of laser chip entering output optical fibre 12.
It should be noted that collimation lens 13 shown in Figure 2 is merely exemplary for convex lens, when it is implemented, also
Can be using the other forms such as convex lens and concavees lens combination, which is not limited by the present invention.
The technical solution of the present embodiment, by the way that the laser chip integral packaging of different wave length pulse laser will be issued in seed
In light source module, seed light source module can be made to export the pulse laser of at least two different wave lengths, it is same by a pumping source
When for all optic fiber amplifying modules provide pump light, can simplify the structure of laser, reduce cost；Pass through a seed light source
Module exports at least two wavelength, realizes the pulse laser output of multi-wavelength, and simple, small in size, the at low cost, property with structure
The stable advantage of energy.
Based on the above technical solution, optionally, multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention
Including at least two-stage optic fiber amplifying module；At least two-stage optic fiber amplifying module is arranged in series.
It is understood that single-stage is amplified in certain applied fields due to that may be saturated when optic fiber amplifying module amplification
It cannot be met the requirements in scape, multistage amplification module can be connected, improve the output power of laser pulse.
Optionally, first order optic fiber amplifying module includes the first wavelength division multiplexer, the first optoisolator, the first gain fibre
And first pump combiner；First wavelength division multiplexer include at least two input terminals and an output end, each input terminal with
The output optical fibre connection of one laser chip, output end are connect with the input terminal of the first optoisolator；First optoisolator it is defeated
Outlet is connect by the first gain fibre with the first input end of the first pump combiner；Or first optoisolator output end
It is connect with the first input end of the first pump combiner, the output end of the first pump combiner is connect with the first gain fibre；The
Second input terminal of one pump combiner is connect with pumping source；Optic fiber amplifying module described in afterbody includes the second wavelength-division multiplex
Device, the second optoisolator, at least two section of second gain fibre, at least two second pump combiners, the first beam splitter and at least
Two third optoisolators, wherein the second wavelength division multiplexer includes an input terminal and at least two output ends, the first beam splitter
Including an input terminal and at least two output ends, the output end of the output end quantity of the first beam splitter, the second wavelength division multiplexer
Quantity, the quantity of the second pump combiner, the quantity of the quantity of the second gain fibre and third optoisolator and seed light
The quantity of laser chip is identical in source module；The input terminal of second optoisolator and the output end of previous stage optic fiber amplifying module connect
It connects, the output end of the second optoisolator is connect with the input terminal of the second wavelength division multiplexer；The input terminal of first beam splitter and pumping
Source connection；The first input end of second pump combiner passes through each output end of the second gain fibre and the second wavelength division multiplexer
It connecting one to one, the second input terminal of the second pump combiner connects one to one with each output end of the first beam splitter,
The output end of second pump combiner is connect with the input terminal of third optoisolator；Or second pump combiner first input
End and each output end of the second wavelength division multiplexer connect one to one, the second input terminal of the second pump combiner and first point
Each output end of beam device connects one to one, and the input terminal of the output end of the second pump combiner and the second gain fibre connects
It connects, the output end of the second gain fibre is connect with the input terminal of third optoisolator.
It illustratively, with multi-Wavelength Pulses optical fiber laser include below two-stage optic fiber amplifying module, seed light source mould
For block is including three laser chips, Fig. 3 show a kind of multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention
Structural schematic diagram.With reference to Fig. 3, multi-Wavelength Pulses optical fiber laser provided in this embodiment includes first order optic fiber amplifying module 2a
It include the first wavelength division multiplexer 21a, the first optoisolator with second level optic fiber amplifying module 2b, first order optic fiber amplifying module 2a
22a, the first gain fibre 23a and the first pump combiner 24a；First wavelength division multiplexer 21a includes three input terminals and one
A output end, each input terminal are connect with the output optical fibre 12 of a laser chip 11, output end and the first optoisolator 22a's
Input terminal connection；The output end of first optoisolator 22a pass through the first gain fibre 23a and the first pump combiner 24a the
The connection of one input terminal；Second level optic fiber amplifying module 2b includes the second wavelength division multiplexer 21b, the second optoisolator 22b, three sections the
Two gain fibre 23b, three the second pump combiner 24b, the first beam splitter 25b and three third optoisolator 26b, wherein the
Two wavelength division multiplexer 21b include an input terminal and three output ends, and the first beam splitter 25b includes that an input terminal and three are defeated
Outlet；The input terminal of second optoisolator 22b is connect with the output end of first order optic fiber amplifying module 2a, the second optoisolator
The output end of 22b is connect with the input terminal of the second wavelength division multiplexer 21b；The input terminal and pumping source 3 of first beam splitter 25b connects
It connects；The first input end of second pump combiner 24b passes through each of the second gain fibre 23b and the second wavelength division multiplexer 21b
Output end connects one to one, each output end one of the second input terminal of the second pump combiner 24b and the first beam splitter 25b
One is correspondingly connected with, and the output end of the second pump combiner 24b is connect with the input terminal of third optoisolator 26b.
It is understood that the first optic fiber amplifying module and the second optic fiber amplifying module shown in Fig. 3 are all made of reversely
Pump mode, in other embodiments, the first optic fiber amplifying module and the second optic fiber amplifying module can select forward pumping
Or backward pumping mode is respectively illustratively another multi-Wavelength Pulses provided in an embodiment of the present invention shown in Fig. 4~Fig. 6
The structural schematic diagram of optical fiber laser.With reference to Fig. 4, unlike Fig. 3, the output end of the first optoisolator 22a and the first pump
The first input end of Pu bundling device 24a connects, and the output end of the first pump combiner 24a is connect with the first gain fibre 23a, the
The second input terminal of one pump combiner 24a is connect with pumping source 3, i.e. the first optic fiber amplifying module uses forward pumping mode.
With reference to Fig. 5, unlike Fig. 3, each of the first input end of the second pump combiner 24b and the second wavelength division multiplexer 21b
Output end connects one to one, each output end one of the second input terminal of the second pump combiner 24b and the first beam splitter 25b
One is correspondingly connected with, and the output end of the second pump combiner 24b is connect with the input terminal of the second gain fibre 23b, the second gain light
The output end of fine 23b is connect with the input terminal of third optoisolator 26b, i.e. the second optic fiber amplifying module uses the side of forward pumping
Formula.With reference to Fig. 6, unlike Fig. 3, the first input of the output end of the first optoisolator 22a and the first pump combiner 24a
End connection, the output end of the first pump combiner 24a are connect with the first gain fibre 23a, and the second of the first pump combiner 24a
Input terminal is connect with pumping source 3；Each of the first input end of second pump combiner 24b and the second wavelength division multiplexer 21b are defeated
Outlet connects one to one, and each output end of the second input terminal of the second pump combiner 24b and the first beam splitter 25b are one by one
It is correspondingly connected with, the output end of the second pump combiner 24b is connect with the input terminal of the second gain fibre 23b, the second gain fibre
The output end of 23b is connect with the input terminal of third optoisolator 26b, i.e. the first optic fiber amplifying module and the second optic fiber amplifying module
It is all made of the mode of forward pumping.It can according to need flexible choice when specific implementation.
It should be noted that Fig. 3~Fig. 6 is exemplary embodiment, when it is implemented, the position of each device can be with
It is adjusted according to the actual situation, such as the position of isolator can move, the embodiment of the present invention is suitable to the connection of each device
Sequence is not construed as limiting, it is only necessary to meet the condition of fiber amplifier.
Optionally, multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention further includes at least one filter, filter
Wave device is set between previous stage optic fiber amplifying module and rear stage optic fiber amplifying module, the input terminal and previous stage light of filter
The output end of fine amplification module connects, and the output end of filter is connect with the input terminal of rear stage optic fiber amplifying module.
Illustratively, Fig. 7 show the structure of another multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention
Schematic diagram.With reference to Fig. 7, multi-Wavelength Pulses optical fiber laser provided in this embodiment further includes a filter 4, and filter 4 is set
It is placed between first order optic fiber amplifying module 2a and second level optic fiber amplifying module 2b, the input terminal and first order light of filter 4
The output end of fine amplification module 2a connects, and the output end of filter 4 is connect with the input terminal of second level optic fiber amplifying module 2b.
It is understood that the light of 4, the filter wavelength for allowing seed light source module 1 to issue penetrates, and prevent other
The light of wavelength penetrates (such as spontaneous emission light of the first optic fiber amplifying module 2a), to filter out noise, improves the steady of laser
It is qualitative.
Optionally, afterbody optic fiber amplifying module further includes at least two collimators, each collimator and afterbody
One output end of optic fiber amplifying module connects.
Illustratively, Fig. 8 show the structure of another multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention
Schematic diagram.With reference to Fig. 8, second level optic fiber amplifying module 2b further includes three collimators 27b, each collimator 27b and the second level
An output end of optic fiber amplifying module 2b connects.By the setting of collimator, the light beam matter of laser output light can be improved
Amount, to be applied to more scenes.
Optionally, the first gain fibre and the second gain fibre are the doped fiber for adulterating identical rare earth element.
Optionally, doped fiber include Yb dosed optical fiber, Er-doped fiber, double clad erbium-ytterbium co-doped fiber, in thulium doped fiber
Any one.
It is understood that Yb dosed optical fiber can be used for generating the laser of 1060nm wave band, Er-doped fiber and double clad erbium
Ytterbium co-doped fiber can be used for generating the laser of 1550nm wave band, and thulium doped fiber can be used for generating the laser of 2000nm wave band,
It can be selected according to practical application scene when specific implementation, and use Wavelength matched laser chip and filter.
Illustratively, 1550nm wave band is located at third low-loss communication window, which has very cloud and mist, flue dust
Strong penetration power, and human eye 1550nm wave band damage threshold than being higher by four quantity in the damage threshold of 1060nm wave band
Grade, so the laser wavelength is also referred to as " eye-safe " laser wavelength.Due to common er-doped 1550nm pulse optical fiber
There may be the lower problem of power, the embodiment of the present invention can also use erbium ytterbium co doped double clad fiber, effectively improve laser
The output power of device.Using erbium-ytterbium co-doped fiber, pass through the Yb of high concentration3+Doping can be to neighbouring Er3+Play well every
From effect, to reduce Er significantly3+Concentration quenching effect, while reducing Er3+Between occur on the probability converted, effectively
Improve gain and output power.
Fig. 9 show the structural representation of another multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention
Figure.With reference to Fig. 9, optionally, multi-Wavelength Pulses optical fiber laser provided in this embodiment further includes the second beam splitter 5, and second point
The input terminal of beam device 5 is connect with the output end of pumping source 3, the first output end of the second beam splitter and the first pump combiner 24a
The connection of the second input terminal, the second output terminal of the second beam splitter 5 connect with the input terminal of the first beam splitter 25b.
In the specific implementation, the splitting ratio of two output ends of the second beam splitter 5 can be rationally designed, it is possible to understand that
It is that the ratio of the pumping light power of first order optic fiber amplifying module 2a and second level optic fiber amplifying module 2b depends on doping
The absorption efficiency and Output optical power value of optical fiber, such as Output optical power are 1W, then the pump light of the first order and the second level
The ratio of power generally can be 2:8 or 3:7.In the present embodiment, two-stage pumping optical power ratio can be set in 2:8~4:
Between 6.
Optionally, pumping source includes 915nm multimode semiconductor laser, 940nm multimode semiconductor laser or with body
Any one of the 976nm multimode semiconductor laser of grating.
Illustratively, for erbium ytterbium co doped double clad fiber, due to Yb3+Absorption spectra it is very wide (800nm-1000nm),
The Absorber Bandwidth of 915nm and 940nm wave band is very wide, guarantees that the factors such as temperature cause pumping source wave length shift not have to amplifier
It significantly affects, the laser of the 976nm with body grating (VBG) can guarantee that wavelength locking in 976nm, hardly follows temperature drift
It moves, under -35 DEG C to 65 DEG C of environment temperature, wave length shift is 0.1nm or so, therefore amplification system can be improved to pumping
The absorption efficiency of light, while also reducing the requirement to pump laser wavelength.
The embodiment of the present invention also provides a kind of laser radar system, including any one multi-wavelength provided by the above embodiment
Pulse optical fiber.In the specific implementation, seed light source module and pumping source require driving circuit, and driving circuit can be with
All controlled by field programmable gate array (Field Programmable Gate Array, FPGA), seed source pulsewidth 3ns~
5ns, power are 10mW~20mW.By utilizing multi-Wavelength Pulses optical fiber laser provided in an embodiment of the present invention, can be improved
The interference free performance of laser radar system.
Optionally, laser radar system provided in an embodiment of the present invention further includes light receiving unit and signal processing unit；
Light receiving unit includes a wavelength-division device and the photoelectric detection module for being set to each output end of wavelength-division device；Wavelength-division device includes
At least two wavelength division modules, each wavelength division module only transmits a kind of light of wavelength, and the light of other wavelength is reflexed to next wave
Sub-module.
Illustratively, Figure 10 show a kind of structural schematic diagram of laser radar system provided in an embodiment of the present invention.Ginseng
Figure 10 is examined, laser radar system provided in this embodiment includes light emitting unit 10, light receiving unit 20 and signal processing unit
30, wherein light emitting unit 10 includes any one multi-Wavelength Pulses optical fiber laser provided by the above embodiment, light-receiving list
Member 20 includes a wavelength-division device and the photoelectric detection module for being set to each output end of wavelength-division device.Figure 11 show of the invention real
A kind of structural schematic diagram of wavelength-division device of example offer is provided.With reference to Figure 11, wavelength-division device includes at least two wavelength division modules 100
(three wavelength division modules are schematically shown in Figure 11), each wavelength division module only transmit a kind of light of wavelength, and by other wavelength
Light reflex to next wavelength division module (such as transmission peak wavelength be λ1Light wave sub-module reflection wavelength be λ2And λ3Light), successively class
It pushes away.In one embodiment, each wavelength division module tilts certain angle, such as slope of about 1~2 °.It is understood that every
The tilt angle of a wavelength division module can also be determined according to the relative positional relationship between each wavelength division module.
Wavelength-division device provided in this embodiment is by the way of free space filtering, compared to the wavelength-division of traditional fiber device
Multiplexer cost is lower, advantageously reduces the cost of laser radar system.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of multi-Wavelength Pulses optical fiber laser characterized by comprising
The pumping of seed light source module, pumping source and at least one level optic fiber amplifying module, all optic fiber amplifying modules is defeated
Enter end to connect with the pumping source, the input of optic fiber amplifying module described in the output end and the first order of the seed light source module
End connection；
The seed light source module is used to issue the pulse laser of at least two different wave lengths, and the seed light source module includes extremely
Few two laser chips, each laser chip are connect with an output optical fibre, and each laser chip issues a kind of wave
Long pulse laser, and integral packaging is in the seed light source module；
The pumping source is used to provide energy for the optic fiber amplifying module；
The optic fiber amplifying module is used to amplify the pulse laser that the seed light source module generates, and amplified pulse is swashed
Light output.
2. multi-Wavelength Pulses optical fiber laser according to claim 1, which is characterized in that including at least two-stage fiber amplifier
Module；At least optic fiber amplifying module described in two-stage is arranged in series.
3. multi-Wavelength Pulses optical fiber laser according to claim 2, which is characterized in that fiber amplifier mould described in the first order
Block includes the first wavelength division multiplexer, the first optoisolator, the first gain fibre and the first pump combiner；
First wavelength division multiplexer includes at least two input terminals and an output end, each input terminal and the laser
The output optical fibre of chip connects, and output end is connect with the input terminal of first optoisolator；
The output end of first optoisolator is first defeated by first gain fibre and first pump combiner
Enter end connection；Or the output end of first optoisolator is connect with the first input end of first pump combiner, institute
The output end for stating the first pump combiner is connect with first gain fibre；
Second input terminal of first pump combiner is connect with the pumping source；
Optic fiber amplifying module described in afterbody includes the second wavelength division multiplexer, the second optoisolator, at least two section of second gain
Optical fiber, at least two second pump combiners, the first beam splitter and at least two third optoisolators, wherein second wavelength-division
Multiplexer includes an input terminal and at least two output ends, and first beam splitter includes that an input terminal and at least two are defeated
Outlet, the output end quantity of first beam splitter, the quantity of the output end of second wavelength division multiplexer, second pumping
The quantity of the quantity of bundling device, the quantity of second gain fibre and the third optoisolator with the seed light source mould
The quantity of laser chip is identical in block；
The output end of optic fiber amplifying module described in the input terminal and previous stage of second optoisolator connects, second light every
It is connect from the output end of device with the input terminal of second wavelength division multiplexer；
The input terminal of first beam splitter is connect with the pumping source；
The first input end of second pump combiner passes through second gain fibre and second wavelength division multiplexer
Each output end connects one to one, and each of the second input terminal of second pump combiner and first beam splitter are defeated
Outlet connects one to one, and the output end of second pump combiner is connect with the input terminal of the third optoisolator；Or
Each output end of the first input end of second pump combiner described in person and second wavelength division multiplexer connects one to one,
Second input terminal of second pump combiner and each output end of first beam splitter connect one to one, and described
The output end of two pump combiners is connect with the input terminal of second gain fibre, the output end of second gain fibre with
The input terminal of the third optoisolator connects.
4. multi-Wavelength Pulses optical fiber laser according to claim 3, which is characterized in that further include at least one filtering
Device, the filter are set between optic fiber amplifying module described in optic fiber amplifying module and rear stage described in previous stage, the filter
The output end of optic fiber amplifying module described in the input terminal and previous stage of wave device connects, the output end of the filter and rear stage institute
State the input terminal connection of optic fiber amplifying module.
5. multi-Wavelength Pulses optical fiber laser according to claim 3, which is characterized in that fiber amplifier described in afterbody
Module further includes at least two collimators, an output end of optic fiber amplifying module described in each collimator and afterbody
Connection.
6. multi-Wavelength Pulses optical fiber laser according to claim 3, which is characterized in that first gain fibre and institute
Stating the second gain fibre is the doped fiber for adulterating identical rare earth element.
7. multi-Wavelength Pulses optical fiber laser according to claim 3, which is characterized in that further include the second beam splitter, institute
The input terminal for stating the second beam splitter is connect with the output end of the pumping source, the first output end of second beam splitter with it is described
Second input terminal of the first pump combiner connects, and the second output terminal of second beam splitter is defeated with first beam splitter
Enter end connection.
8. multi-Wavelength Pulses optical fiber laser according to claim 1, which is characterized in that the seed light source module is also wrapped
At least two collimation lenses are included, the collimation lens and the laser chip correspond, and are set to the laser chip and institute
It states between output optical fibre, the collimation lens is used to the pulse laser that the laser chip exports being coupled into the output light
It is fine.
9. a kind of laser radar system, which is characterized in that swash including any multi-Wavelength Pulses optical fiber of claim 1~8
Light device.
10. laser radar system according to claim 9, which is characterized in that further include light receiving unit and signal processing
Unit；
The light receiving unit includes a wavelength-division device and the photoelectric detection module for being set to each output end of wavelength-division device；
The wavelength-division device includes at least two wavelength division modules, and each wavelength division module only transmits a kind of light of wavelength, and will
The light of other wavelength reflexes to next wavelength division module.
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