CN208399673U - A kind of laser radar based on optical fiber mode fields adapter - Google Patents
A kind of laser radar based on optical fiber mode fields adapter Download PDFInfo
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Abstract
The utility model discloses a kind of laser radars based on optical fiber mode fields adapter.The utility model proposes optical fiber mode fields adapter is used in the telescope of laser radar, wherein, the input terminal of optical fiber mode fields adapter is large mode field optical fiber end, it connect with the output end of optical transceiver module, for receiving Received Signal, and the output end of optical fiber mode fields adapter is small mould field optical fiber, is connect with optical receiver, small mould field optical fiber is conducive to carry out the extraction of optically filtering and optical signal, to reduce the cost of laser radar.The utility model is conducive to optical fiber mode fields adapter and dexterously solves the contradiction that existing laser radar is handled for receiving signal field angle and optical data, while guaranteeing echo-signal coupling efficiency, expand field angle, improve laser radar performance, and it can satisfy the requirement of optical receiver and photodetector to small mould field, reduce follow-up data processing difficulty, improves the overall performance and application range of laser radar.
Description
Technical field
The utility model relates to laser radar more particularly to a kind of laser radars based on optical fiber mode fields adapter.
Background technique
The basic principle of weather laser radar is: shoot laser pulse and atmospheric interaction are collected using optical antenna
Optical receiver is inputted after atmospheric backscatter signal, after photodetection and data processing, obtains a series of crucial atmosphere ginsengs
Number.Such as aerosol concentration, PM2.5 value, the cloud level, temperature, humidity, visibility, Atmospheric components (such as steam, various polluted gas)
Deng.
Laser radar requires the field angle of receiving telescope to be greater than the angle of divergence for emitting laser.The utility model it is practical new
Type people discovery, in order to meet above-mentioned requirements, on the one hand need to reduce the angle of divergence of transmitting laser, this can in laser radar design
To expand multiplying power with raising to realize by the focal length for increasing transmitter-telescope；Still further aspect need to increase receiving telescope
Field angle, this can be realized by reducing the focal length of telescope or increasing the mode field area of coupling optical fiber.
The utility model people of the utility model has found that the focal length for increasing transmitter-telescope can bring telescope module volume
Increase, and due to increasing focal length, laser beam is easier to be shaken the influence with the variation of environment temperature and humidity pressure, to reduce and be
The stability of system.And at receiving telescope end, when mono- timing of numerical aperture NA of coupling optical fiber, reduce the focal length of telescope, it will
The reduction of the capture area of receiving telescope is caused, to reduce the detection performance of laser radar；If using large mode field
Fiber coupling, then subsequent optical signal prosessing need to use large mode field optical fiber, and which greatly enhances the difficulties of optical signal detection and processing
Degree, some optical receivers are not available large mode field optical fiber work, in addition, there is also cost height, performance for multimode photodetector
The problem of difference.Therefore, large mode field optical fiber limits certain laser radars, especially anemometry laser radar, moves back polarization lidar
With the application of thermometric laser radar.These defects significantly limit the development of laser radar.
Utility model content
The utility model people of the utility model has found after study: by using optical fiber mode fields adapter, it can be achieved that from big
Conversion of the mould field optical fiber to small mould field optical fiber.
One of the purpose of this utility model is, provides a kind of laser radar based on optical fiber mode fields adapter, compared to
The coupling device of laser radar used at present has receiving telescope visual field big, and transmitting-receiving telescopic system is small and exquisite, and optical signal is visited
It surveys and handles.
In order to achieve the above object, the utility model is the following technical schemes are provided: a kind of swashing based on optical fiber mode fields adapter
Optical radar, comprising: light source module, optical transceiver module, optical fiber mode fields adapter, optical receiver, signal acquisition module and letter
Number processing module；Wherein:
The light source module includes laser element and laser amplifier, and the laser element is for exporting laser arteries and veins
Punching；The laser amplifier is used to amplify the laser pulse of the laser element output；
The optical transceiver module is used to receive the laser beam of laser amplifier output, and received laser beam is entered
It is incident upon detection target, and receives the echo-signal of the detection target back scattering；
The optical fiber mode fields adapter for realizing echo-signal from large mode field optical fiber end to the conversion of small mould field optical fiber end,
The optical fiber mode fields adapter includes large mode field optical fiber end and small mould field optical fiber end, and the mode field area at the large mode field optical fiber end is big
In the mode field area of the small mould field optical fiber end；The output end at the large mode field optical fiber end and optical transceiver module connects, institute
Small mould field optical fiber end is stated to connect with optical receiver；
The optical receiver is for receiving and handling the echo-signal, to extract the optics that the echo-signal carries
Information；
The signal acquisition module is used to acquire the optical signal of optical receiver output；
The signal processing module is used to handle the electric signal of signal acquisition module acquisition, and is obtained according to preset algorithm
Target component information.
Further, the laser element includes continuous light laser and laser pulse generator；The continuous light swashs
The input terminal of the output end of light device and laser pulse generator connects, the output end of laser pulse generator and laser amplifier
Input terminal connection, the output end of laser amplifier and the input terminal of optical transceiver module connect, the output end of optical transceiver module
It is connect with the input terminal of optical fiber mode fields adapter.
Further, the laser element includes pulse laser；The output end of the pulse laser is put with laser
The input terminal connection of big device, the output end of laser amplifier and the input terminal of optical transceiver module connect, optical transceiver module
Output end is connect with the input terminal of optical fiber mode fields adapter.
Further, the optical transceiver module includes laser emitting module and signal receiving module, the Laser emission
Module is used to for received laser beam being incident to detection target, and the signal receiving module is for after receiving the detection target
To the echo-signal of scattering；The output end of the signal receiving module is connect with the large mode field optical fiber end of optical fiber mode fields adapter；
The large mode field optical fiber end of the optical fiber mode fields adapter is input terminal, and small mould field optical fiber end is output end.
Further, the optical transceiver module include circulator and transmitting-receiving telescope, the input terminal of the circulator with
The output end of impulse generator connects, and the sending and receiving end of the circulator is connect with transmitting-receiving telescope, the output end of the circulator
It is connect with the large mode field optical fiber end of optical fiber mode fields adapter；The large mode field optical fiber end of the optical fiber mode fields adapter is input terminal,
Small mould field optical fiber end is output end.
Further, the large mode field optical fiber end of the optical fiber mode fields adapter is multimode fibre, optical fiber mode fields adapter
Small mould field optical fiber end is single mode optical fiber.
Further, the optical fiber mode fields adapter is polarization-maintaining pattern field adapter or non-polarization-maintaining pattern field adapter.
Further, the optical fiber core diameter at the large mode field optical fiber end of the optical fiber mode fields adapter is 62.5um, numerical aperture
NA is 0.275；The mode field diameter of the small mould field optical fiber end of the optical fiber mode fields adapter is 10.1um, and numerical aperture NA is
0.125。
Further, the optical fiber core diameter at the large mode field optical fiber end of the optical fiber mode fields adapter is 30um, numerical aperture NA
It is 0.07；The mode field diameter of the small mould field optical fiber end of the optical fiber mode fields adapter is 10.1um, and numerical aperture NA is 0.125.
Further, the mode field diameter at the large mode field optical fiber end of the optical fiber mode fields adapter is 10.1um, numerical aperture
NA is 0.125, and the optical fiber core diameter of the small mould field optical fiber end of the optical fiber mode fields adapter is 5.3um, and numerical aperture NA is 0.14.
Further, the target includes hard goal, atmosphere and ocean.
Laser radar provided by the utility model based on optical fiber mode fields adapter has the following beneficial effects:
(1) the utility model utilizes the large mode field optical fiber end of optical fiber mode fields adapter by setting optical fiber mode fields adapter
Received Signal is received, the coupling efficiency of echo-signal is significantly improved by increasing optical fiber mode fields, expands field of view of receiver
Angle simultaneously can reduce face type requirement of the laser radar to telescope.Received Signal is received using large mode field optical fiber end, is not needed
The focal length for reducing receiving telescope, so that it is effectively guaranteed that the capture area of receiving telescope, improves the spy of laser radar
Survey performance.In addition, since field of view of receiver significantly increases, additionally it is possible to be effectively reduced the requirement to transmitter-telescope focal length, reduce
The focal length of transmitter-telescope, and then reduce the volume of telescope module, so that laser beam is not readily susceptible to vibration and environment warm and humid
The influence of buckling, to improve the stability of laser radar system on the whole.
(2) the utility model is connected to optical receiver using the small mould field optical fiber end of optical fiber mode fields adapter, subsequent
Small mould field optical fiber can be used in optical signal prosessing, and the use of small mould field optical fiber can be substantially reduced the difficulty of optical signal detection and processing
Degree.In particular, for the optical receiver of fraction of laser light radar, such as anemometry laser radar moves back polarization lidar and thermometric swashs
Optical radar etc. is very strict to the limitation of optical fiber mode fields, can only could be worked using specific small mould field optical fiber.The utility model
Dexterously solve what existing laser radar handled reception signal field angle and optical data conducive to optical fiber mode fields adapter
Contradiction expands field angle while guaranteeing echo-signal coupling efficiency, improves laser radar performance, and can satisfy optics
The requirement of receiver and photodetector to small mould field reduces follow-up data processing difficulty, improves the globality of laser radar
Energy and application range.
Detailed description of the invention
It in order to more clearly describe the embodiments of the utility model or the technical solutions in the prior art and advantage, below will be right
Drawings that need to be used in the embodiment or the prior art description is briefly described, it should be apparent that, be described below in it is attached
Figure is only that some embodiments of the utility model is not making the creative labor for those of ordinary skill in the art
Under the premise of, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structural frames of laser radar based on optical fiber mode fields adapter provided by the embodiment of the utility model
Figure；
Fig. 2 is a kind of another structure of laser radar based on optical fiber mode fields adapter provided by the embodiment of the utility model
Block diagram.
Specific embodiment
What is be described below is some in multiple possible embodiments of the utility model, it is desirable to provide to the utility model
Basic understanding, it is no intended to confirm the crucial or conclusive element of the utility model or limit scope of the claimed.It is easy
Understand, technical solution according to the present utility model, under the connotation for not changing the utility model, the general technology of this field
Personnel can propose other implementations that can be replaced mutually.Therefore, following specific embodiments and attached drawing are only to this reality
With the exemplary illustration of novel technical solution, and it is not to be construed as the whole of the utility model or is considered as to the utility model
Technical solution defines or limits.
In following description, for the clear and concise of description, there is no retouch all multiple components shown in figure
It states.The disclosure for being fully able to realize of the utility model is provided shown in the drawings of multiple components for those of ordinary skill in the art
Content.To those skilled in the art, perhaps multipart operation is all familiar and apparent.
Herein, "upper", "lower", "left", "right", "front", "rear" directional terminology be relative to the laser thunder in attached drawing
Orientation or orientation relatively shown in the drawings up to after installing and using define, also, it is to be understood that these directionality
Term is opposite concept, they be used for relative to description and clarification, can be according to the orientation that laser radar is put
Change and correspondingly changes.
Embodiment 1:
Fig. 1 is a kind of structural frames of laser radar based on optical fiber mode fields adapter provided by the embodiment of the utility model
Figure includes: that light source module 1, optical transceiver module 2, optical fiber mode fields adapter 3, optical receiver 4, signal are adopted as shown in Figure 1:
Collect module 5 and with signal processing module 6；Wherein:
The light source module 1 includes laser element 11 and laser amplifier 12, and the laser element 11 is for exporting
Laser pulse；The laser amplifier 12 is used to amplify the laser pulse that the laser element 11 exports.
In one embodiment, the laser element 11 includes continuous light laser and laser pulse generator；It is described
The output end of continuous light laser and the input terminal of laser pulse generator connect, the output end and laser of laser pulse generator
The input terminal of amplifier 12 connects, and the output end of laser amplifier 12 is connect with the input terminal of optical transceiver module 2, optical transmitting and receiving
The output end of module 2 is connect with the input terminal of optical fiber mode fields adapter 3.
Alternatively, in another embodiment of the utility model, the laser element 11 includes pulse
Laser；The output end of the pulse laser is connect with the input terminal of laser amplifier 12, the output end of laser amplifier 12
It is connect with the input terminal of optical transceiver module 2, the output end of optical transceiver module 2 and the input terminal of optical fiber mode fields adapter 3 connect
It connects.
The optical transceiver module 2 is used to receive the laser beam of laser amplifier output, and by received laser beam
It is incident to detection target, and receives the echo-signal of the detection target back scattering；
The optical fiber mode fields adapter 3 is for realizing echo-signal from large mode field optical fiber end 31 to small mould field optical fiber end 32
Conversion, the optical fiber mode fields adapter 3 include large mode field optical fiber end 31 and small mould field optical fiber end 32, the large mode field optical fiber end 31
Mode field area be greater than the small mould field optical fiber end 32 mode field area；The large mode field optical fiber end 31 and optical transceiver module
2 output end connection, the small mould field optical fiber end 32 are connect with optical receiver 4.
The input terminal of optical fiber mode fields adapter 3 is large mode field optical fiber end 31, and output end is small mould field optical fiber end 32.
The optical receiver 4 is for receiving and handling the echo-signal, to extract the light that the echo-signal carries
Learn information.
The signal acquisition module 5 is used to acquire the optical signal of the output of optical receiver 4.Signal acquisition module 5 can wrap
Include photodetector.
The signal processing module 6 is used to handle the electric signal of the acquisition of signal acquisition module 5, and is obtained according to preset algorithm
Obtain target component information.Signal processing module 6 includes computer or the software and hardware with data operation processing function.
Optical receiver 4 may include optical filter and Optical Frequency Discriminator, such as molecular absorption line, Fabry-Perot interference
Instrument (FPI), Michelson interferometer, grating, prism, Mach-Zehnder interferometer (MZI), Fizeau interferometer or micro-nano
Chamber, optical fiber bragg grating FBG.Optical Frequency Discriminator has strict requirements for the mould field of optical fiber, generally requires single mode optical fiber.It is single
Mould photodetector is at low cost, performance is good relative to multimode photodetector.
When optical fiber transmission signal light, mode field diameter (MFD) and numerical aperture (NA) are important two description fiber containments
The ability of signal.The diameter of mould field (ModeField), i.e. mode field diameter (MFD, ModeFieldDiameter), for being characterized in
The distribution of the core region basic mode light of single mode optical fiber.Basic mode is maximum in core region axis line location light intensity, and with deviation
The distance of axial line increases and gradually weakens.Mode field diameter is generally defined as that light intensity is reduced to axis line location largest light intensity 1/
Two o'clock maximum distance in each point of e2.The size of mode field diameter and used wavelength have relationship, with the increase mould field of wavelength
Diameter increases.1310nm representative value: 9.2 ± 0.5 μm, 1550nm representative value: 10.5 ± 1.0 μm.In a fiber, light energy is endless
It concentrating in fibre core transmitting entirely, portion of energy is transmitted in covering, and the diameter of fibre core cannot reflect the distribution of light energy in optical fiber,
Its concept with mode field diameter.Mode field diameter is exactly the parameter for describing luminous energy intensity in single mode optical fiber, effective area with
The physical significance of mode field diameter is identical.It can use area formula of circle by mode field diameter and calculate effective area.Mode field diameter
With effective area mainly to related by the energy density of optical fiber.Mode field diameter is smaller, passes through the energy density of cross section of optic fibre
It is bigger.When excessive by the energy density of optical fiber, the nonlinear effect of optical fiber can be caused, the optical signal to noise ratio of system is caused to drop
It is low, largely effect on system performance.Therefore, for transmission fiber, mode field diameter (or effective area) is the bigger the better.But
For optical signal prosessing, then very small mode field diameter is needed.
Optical fiber mode fields adapter, also referred to as mould field adapter (MFA, Mode Field Adaptor) can make two kinds of tools
There are different mode field diameters together with the fused fiber splice of numerical aperture, and obtains fundamental signal at fusion point to greatest extent
Transmitance.
As shown in Figure 1, the optical transceiver module 2 includes laser emitting module 21 and signal receiving module 22, it is described to swash
Optical transmitter module 21 is used to for received laser beam being incident to detection target, and the signal receiving module 22 is described for receiving
Detect the echo-signal of target back scattering；The output end of the signal receiving module 22 and the large mode field of optical fiber mode fields adapter
Optical fiber end 31 connects；The large mode field optical fiber end 31 of the optical fiber mode fields adapter is input terminal, and small mould field optical fiber end 32 is output
End.Specifically, laser emitting module 21 can be transmitter-telescope, the signal receiving module is receiving telescope, optical fiber mode
The focal position of signal receiving module 22 is arranged in the large mode field optical fiber end 31 of field adapter.
When optical transceiver module 2 includes laser emitting module 21 and signal receiving module 22 and laser radar is transmitting-receiving
Split shaft structure, using optical fiber mode fields adapter, the field angle that receiving telescope can be better achieved is greater than the hair of transmitting laser
Dissipate angle.
In another alternative embodiment, as shown in Fig. 2, the optical transceiver module 2 includes circulator 23 and transmitting-receiving
Telescope 24, circulator 23 be preferably optical fiber circulator 23, optical fiber circulator 23 include three ports: input terminal, sending and receiving end and
Output end；The input terminal of the circulator 23 and the output end of impulse generator connect, the sending and receiving end of the circulator 23 and receipts
It sends out telescope 24 to connect, the output end of the circulator 23 is connect with the large mode field optical fiber end 31 of optical fiber mode fields adapter；It is described
The large mode field optical fiber end 31 of optical fiber mode fields adapter is input terminal, and small mould field optical fiber end 32 is output end.Specifically, the annular
The focal point of transmitting-receiving telescope 24 is arranged in the sending and receiving end of device 23.
In an alternative embodiment, the large mode field optical fiber end 31 of the optical fiber mode fields adapter 3 is multimode fibre, light
The small mould field optical fiber end 32 of fine mould field adapter 3 is single mode optical fiber.Certainly, in other examples, optical fiber mode fields adapter 3
Large mode field optical fiber end 31 and the small mould field optical fiber end 32 of optical fiber mode fields adapter 3 can all be multimode fibre, alternatively, optical fiber mode
The large mode field optical fiber end 31 of field adapter 3 and the small mould field optical fiber end 32 of optical fiber mode fields adapter 3 are all single mode optical fibers；As long as full
The mode field area at the large mode field optical fiber end 31 of sufficient optical fiber mode fields adapter 3 is greater than the small mould field optical fiber end of optical fiber mode fields adapter 3
32 mode field area is suitable for the utility model.
Further, the optical fiber mode fields adapter 3 is polarization-maintaining pattern field adapter or non-polarization-maintaining pattern field adapter.When
When optical fiber mode fields adapter 3 is polarization-maintaining pattern field adapter, what optical receiver received is polarized light signal, when optics receives
When machine includes interferometer, polarised light can guarantee that optical receiver works normally.
The laser emitting module 21 and signal receiving module 22 can be using transmitting-receiving split axle structures, or contracture is same
Axle construction, the field angle for meeting signal receiving module 22 are greater than the field angle of 21 shoot laser of laser emitting module.
Since the optical fiber mode fields adapter 3 increases the field angle of signal receiving module 22, to also reduce laser
What transmitting module 21 needed expands multiplying power, or shortens the focal length of laser emitting module 21, improves system stability.
The input terminal of the optical fiber mode fields adapter 3 is large mode field optical fiber, is connect with signal receiving module 22, is increased
The field angle of signal receiving module 22.
The input terminal of the optical fiber mode fields adapter 3 is small mould field optical fiber, is connect with optical receiver 4, thus complete
It is extracted at optically filtering and optical signal.
In one embodiment of the utility model, the optical fiber at the large mode field optical fiber end 31 of the optical fiber mode fields adapter 3
Core diameter is 62.5um, and numerical aperture NA is 0.275；The mode field diameter of the small mould field optical fiber end 32 of the optical fiber mode fields adapter 3
It is 0.125 for 10.1um, numerical aperture NA.
In one embodiment of the utility model, the optical fiber at the large mode field optical fiber end 31 of the optical fiber mode fields adapter 3
Core diameter is 30um, and numerical aperture NA is 0.07；The mode field diameter of the small mould field optical fiber end 32 of the optical fiber mode fields adapter 3 is
10.1um, numerical aperture NA are 0.125.
In one embodiment of the utility model, the mould field at the large mode field optical fiber end 31 of the optical fiber mode fields adapter 3
Diameter is 10.1um, and numerical aperture NA is 0.125, the optical fiber core diameter of the small mould field optical fiber end 32 of the optical fiber mode fields adapter 3
It is 0.14 for 5.3um, numerical aperture NA.
Certainly, the mode field diameter and numerical aperture at the large mode field optical fiber end 31 of the optical fiber mode fields adapter 3 of the utility model
NA can also be other numerical value, as long as the mode field area for meeting the large mode field optical fiber end 31 of optical fiber mode fields adapter 3 is greater than optical fiber
The mode field area of the small mould field optical fiber end 32 of mould field adapter 3 is suitable for the utility model.
Further, the target includes hard goal, atmosphere and ocean.
Laser radar provided by the utility model based on optical fiber mode fields adapter has the following beneficial effects:
(1) the utility model utilizes the large mode field optical fiber end of optical fiber mode fields adapter by setting optical fiber mode fields adapter
Received Signal is received, the coupling efficiency of echo-signal is significantly improved by increasing optical fiber mode fields, expands field of view of receiver
Angle simultaneously can reduce face type requirement of the laser radar to telescope.Received Signal is received using large mode field optical fiber end, is not needed
The focal length for reducing receiving telescope, so that it is effectively guaranteed that the capture area of receiving telescope, improves the spy of laser radar
Survey performance.In addition, since field of view of receiver significantly increases, additionally it is possible to be effectively reduced the requirement to transmitter-telescope focal length, reduce
The focal length of transmitter-telescope, and then reduce the volume of telescope module, so that laser beam is not readily susceptible to vibration and environment warm and humid
The influence of buckling, to improve the stability of laser radar system on the whole.
(2) the utility model is connected to optical receiver using the small mould field optical fiber end of optical fiber mode fields adapter, subsequent
Small mould field optical fiber can be used in optical signal prosessing, and the use of small mould field optical fiber can be substantially reduced the difficulty of optical signal detection and processing
Degree.In particular, for the optical receiver of fraction of laser light radar, such as anemometry laser radar moves back polarization lidar and thermometric swashs
Optical radar etc. is very strict to the limitation of optical fiber mode fields, can only could be worked using specific small mould field optical fiber.The utility model
Dexterously solve what existing laser radar handled reception signal field angle and optical data conducive to optical fiber mode fields adapter
Contradiction expands field angle while guaranteeing echo-signal coupling efficiency, improves laser radar performance, and can satisfy optics
The requirement of receiver and photodetector to small mould field reduces follow-up data processing difficulty, improves the globality of laser radar
Energy and application range.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the protection scope of the utility model.
Claims (10)
1. a kind of laser radar based on optical fiber mode fields adapter characterized by comprising light source module, optical transceiver module,
Optical fiber mode fields adapter, optical receiver, signal acquisition module and signal processing module；Wherein:
The light source module includes laser element and laser amplifier, and the laser element is used for output laser pulse；Institute
Laser amplifier is stated for amplifying the laser pulse of the laser element output；
The optical transceiver module is used to receive the laser beam of laser amplifier output, and received laser beam is incident to
Target is detected, and receives the echo-signal of the detection target back scattering；
The optical fiber mode fields adapter for realizing echo-signal from large mode field optical fiber end to the conversion of small mould field optical fiber end, it is described
Optical fiber mode fields adapter includes large mode field optical fiber end and small mould field optical fiber end, and the mode field area at the large mode field optical fiber end is greater than institute
State the mode field area of small mould field optical fiber end；The output end at the large mode field optical fiber end and optical transceiver module connects, described small
Mould field optical fiber end is connect with optical receiver；
The optical receiver is for receiving and handling the echo-signal, to extract the optics letter that the echo-signal carries
Breath；
The signal acquisition module is used to acquire the optical signal of optical receiver output；
The signal processing module is used to handle the electric signal of signal acquisition module acquisition, and obtains target according to preset algorithm
Parameter information.
2. the laser radar according to claim 1 based on optical fiber mode fields adapter, which is characterized in that the laser list
Member includes continuous light laser and laser pulse generator；The output end of the continuous light laser and laser pulse generator
Input terminal connection, the output end of laser pulse generator and the input terminal of laser amplifier connect, the output end of laser amplifier
It is connect with the input terminal of optical transceiver module, the output end of optical transceiver module is connect with the input terminal of optical fiber mode fields adapter.
3. the laser radar according to claim 1 based on optical fiber mode fields adapter, which is characterized in that the laser list
Member includes pulse laser；The output end of the pulse laser and the input terminal of laser amplifier connect, laser amplifier
The connection of the input terminal of output end and optical transceiver module, the output end of optical transceiver module and the input terminal of optical fiber mode fields adapter
Connection.
4. the laser radar according to claim 1 based on optical fiber mode fields adapter, which is characterized in that the optical transmitting and receiving
Module includes laser emitting module and signal receiving module, and the laser emitting module is for received laser beam to be incident to
Target is detected, the signal receiving module is used to receive the echo-signal of the detection target back scattering；The signal receives
The output end of module is connect with the large mode field optical fiber end of optical fiber mode fields adapter；The large mode field optical fiber of the optical fiber mode fields adapter
End is input terminal, and small mould field optical fiber end is output end.
5. the laser radar according to claim 1 based on optical fiber mode fields adapter, which is characterized in that the optical transmitting and receiving
Module includes circulator and transmitting-receiving telescope, and the input terminal of the circulator and the output end of impulse generator connect, the ring
The sending and receiving end of shape device is connect with transmitting-receiving telescope, the output end of the circulator and the large mode field optical fiber end of optical fiber mode fields adapter
Connection；The large mode field optical fiber end of the optical fiber mode fields adapter is input terminal, and small mould field optical fiber end is output end.
6. the laser radar according to claim 1 based on optical fiber mode fields adapter, which is characterized in that the optical fiber mode fields
The large mode field optical fiber end of adapter is multimode fibre, and the small mould field optical fiber end of optical fiber mode fields adapter is single mode optical fiber.
7. the laser radar according to claim 1 based on optical fiber mode fields adapter, which is characterized in that the optical fiber mode fields
Adapter is polarization-maintaining pattern field adapter or non-polarization-maintaining pattern field adapter.
8. the laser radar according to claim 1 based on optical fiber mode fields adapter, which is characterized in that the optical fiber mode fields
The optical fiber core diameter at the large mode field optical fiber end of adapter is 62.5um, and numerical aperture NA is 0.275；The optical fiber mode fields adapter
The mode field diameter of small mould field optical fiber end is 10.1um, and numerical aperture NA is 0.125.
9. the laser radar according to claim 1 based on optical fiber mode fields adapter, which is characterized in that the optical fiber mode fields
The optical fiber core diameter at the large mode field optical fiber end of adapter is 30um, and numerical aperture NA is 0.07；The optical fiber mode fields adapter it is small
The mode field diameter of mould field optical fiber end is 10.1um, and numerical aperture NA is 0.125.
10. the laser radar according to claim 1 based on optical fiber mode fields adapter, which is characterized in that the optical fiber mode
The mode field diameter at the large mode field optical fiber end of field adapter is 10.1um, and numerical aperture NA is 0.125, the optical fiber mode fields adapter
Small mould field optical fiber end optical fiber core diameter be 5.3um, numerical aperture NA be 0.14.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108594207A (en) * | 2018-07-13 | 2018-09-28 | 合肥菲涅尔光电科技有限公司 | A kind of laser radar based on optical fiber mode fields adapter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108594207A (en) * | 2018-07-13 | 2018-09-28 | 合肥菲涅尔光电科技有限公司 | A kind of laser radar based on optical fiber mode fields adapter |
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