CN106443888B - A kind of all -fiber filter based on fiber F-P filter - Google Patents
A kind of all -fiber filter based on fiber F-P filter Download PDFInfo
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- CN106443888B CN106443888B CN201610820990.2A CN201610820990A CN106443888B CN 106443888 B CN106443888 B CN 106443888B CN 201610820990 A CN201610820990 A CN 201610820990A CN 106443888 B CN106443888 B CN 106443888B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29358—Multiple beam interferometer external to a light guide, e.g. Fabry-Pérot, etalon, VIPA plate, OTDL plate, continuous interferometer, parallel plate resonator
- G02B6/29359—Cavity formed by light guide ends, e.g. fibre Fabry Pérot [FFP]
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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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
-
- 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
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention discloses a kind of all -fiber filters based on fiber F-P filter, including fiber coupling interconnected and branch apparatus and two-level concatenation all -fiber filter.The present invention is made of fiber coupler, fiber band-pass filter and fiber F-P filter, use optical fiber structure completely on light splitting technology, by the received Received Signal of telescope through fiber coupling to all -fiber beam splitting system, realize that the input of all -fiber and filtering export using the connection of optical fiber and optical fiber, substantially reduce the volume and weight of beam splitting system, the device is stablized with more system, the structural advantages of high reliablity and strong anti-interference performance.Simultaneously from the vibrating Raman scattered signal of vapour molecule in atmosphere, the vibrating Raman scattered signal and rice-Rayleigh scattering signal of nitrogen molecule can be extracted in spectral characteristic respectively, and highly inhibit rice-Rayleigh scattering signal and other spuious optical signals in Raman channel.
Description
Technical field
The invention belongs to laser radar atmospheric sounding techniques fields, and in particular to a kind of based on the complete of fiber F-P filter
Optical fiber filter.
Background technique
Laser radar is a kind of active contemporary optics remote sensing equipment, have very high space, time resolution and
The advantages that very high detectivity, is widely used in the detection of (1) atmospheric optical parameters phase visibility；(2) aerosol and cigarette
The detection of plumage；(3) detection of atmosphere wind and turbulent flow；(4) detection of atmospheric gas components and concentration and distribution；(5) atmospheric temperature and
The detection of moisture content.
Raman lidar is acted on using the Raman scattering of laser and atmospheric medium, by the Raman diffused light for detecting medium
The optical detection means that the information such as the density to medium are detected.Vibrating Raman lidar is to utilize gas molecule in atmosphere
The backscattering echo signal of (such as nitrogen, oxygen and steam) and the relation of interdependence of density, by detecting its vibrating Raman
The variation of scattered signal obtains the inverting to Water Vapor Content.And the design of efficient raman spectroscopic system is always steam
Detect one of the key technology of steam Raman lidar.Currently, mostly using interference to filter in Raman laser radar system both at home and abroad
The light-splitting devices such as mating plate, diffraction grating extract required Raman scattering echo-signal.But these traditional beam splitting systems generally have
There is the deficiencies of volume is larger, structure is not compact, optical path adjustment is complicated, poor reliability.
Summary of the invention
The object of the present invention is to provide a kind of all -fiber filters based on fiber F-P filter, solve present technology
Present in the problems such as volume is big, poor reliability, complicated adjustment.
The technical scheme adopted by the invention is that a kind of all -fiber filter based on fiber F-P filter, including phase
The fiber coupling and branch apparatus and two-level concatenation all -fiber filter, the atmosphere that telescopic system receives to connect is backward
Scatter echo signal is first divided into three tunnels through fiber coupling and branch apparatus, is then filtered through two-level concatenation all -fiber filter
Wave.
The features of the present invention also characterized in that
Fiber coupling and branch apparatus include multimode fibre and 1 × 3 optical fiber splitter connecting with multimode fibre, wherein light
Fine splitter is in series by fiber coupler I and fiber coupler II, and the output end of multimode fibre is defeated with fiber coupler I's
Enter arm a0 connection, fiber coupler I is exported by coupling ratio 50:50 in output arm a1 and output arm a2 respectively, fiber coupler I's
Output arm a2 connects with fiber coupler II, and fiber coupler II is exported by coupling ratio 50:50 in output arm b2 and output arm b3,
Output arm a1, output arm b2 and output arm b3 are connect with two-level concatenation all -fiber filter respectively.
The spectral region of fiber coupler I and fiber coupler II is different.
The energy allocation proportion of output arm a1, output arm b2 and output arm b3 are 5:2.5:2.5.
Two-level concatenation all -fiber filter, including the fiber band-pass filter I and and fibre ribbon with output arm a1 welding
The fiber F-P filter I of bandpass filter I welding forms the fiber band-pass filter II of the first optical-fibre channel, output arm b2 welding
With the fiber F-P filter II with fiber band-pass filter II welding, the optical fiber of the second optical-fibre channel, output arm b3 welding is formed
Bandpass filter III and fiber F-P filter III with fiber band-pass filter III welding forms third optical-fibre channel.
First optical-fibre channel is steam Raman scattering channel, and the second optical-fibre channel is nitrogen Raman scattering channel, third light
Fine channel is Mie scattering channel.
In the first optical-fibre channel, output arm a1 is welded to the input terminal of fiber band-pass filter I, fiber band-pass filter
The input port welding of the output end and fiber F-P filter I of I.
In the second optical-fibre channel, the input terminal welding of output arm b2 and fiber band-pass filter II, optical fiber bandpass filtering
The input port welding of the output end and fiber F-P filter II of device II.
In third optical-fibre channel, the input terminal welding of output arm b3 and fiber band-pass filter III, optical fiber bandpass filtering
The input port welding of the output end and fiber F-P filter III of device III.
The central wavelength of fiber band-pass filter I is 660nm, and for bandwidth in 20~30nm, Out-of-band rejection rate reaches 3 quantity
The spectral characteristic of grade；The central wavelength of fiber band-pass filter II is 606nm, and bandwidth reaches 3 in 20~30nm, Out-of-band rejection rate
The spectral characteristic of a order of magnitude；The central wavelength of fiber band-pass filter III is 532nm, and bandwidth is in 20~30nm, Out-of-band rejection
Rate reaches the spectral characteristic of 3 orders of magnitude.
The invention has the advantages that the present invention is based on all -fiber filters of fiber F-P filter, by fiber coupling
Device, fiber band-pass filter and fiber F-P filter are constituted, and use optical fiber structure completely on light splitting technology, telescope is connect
The Received Signal of receipts realizes the defeated of all -fiber through fiber coupling to all -fiber beam splitting system, using the connection of optical fiber and optical fiber
Enter with filtering export, substantially reduce the volume and weight of beam splitting system, the device with more system stablize, high reliablity and resist
The strong structural advantages of jamming performance.Letter is scattered from the vibrating Raman that can extract vapour molecule in atmosphere in spectral characteristic respectively simultaneously
Number, the vibrating Raman scattered signal and rice-Rayleigh scattering signal of nitrogen molecule, and highly inhibit rice-Rayleigh in Raman channel
Scattered signal and other spuious optical signals.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of all -fiber filter the present invention is based on fiber F-P filter；
Fig. 2 is the structural schematic diagram of fiber coupling and branch apparatus in all -fiber filter of the present invention；
Fig. 3 is the output spectrum characteristic of optical fiber splitter output arm a1 in the present invention；
Fig. 4 is the output spectrum characteristic of optical fiber splitter output arm b2 in the present invention；
Fig. 5 is the output spectrum characteristic of optical fiber splitter output arm b3 in the present invention；
Fig. 6 is the Spectral Properties of the output port of fiber F-P filter I in the first optical-fibre channel (vapor channel) in the present invention
Property output figure；
Fig. 7 is that Raman laser radar system detects Analysis signal-to-noise ratio (SNR) to atmosphere vapour.
In figure, 1. multimode fibres, 2.1 × 3 optical fiber splitters, 3. fiber band-pass filter I, 4. fiber F-P filter I,
5. fiber band-pass filter II, 6. fiber F-P filter II, 7. fiber band-pass filter III, 8. fiber F-P filter III,
9. fiber coupler I, 10. fiber coupler II.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The present invention is based on all -fiber filters of fiber F-P filter, as shown in Figure 1, including optical fiber interconnected
Coupling and branch apparatus and two-level concatenation all -fiber filter, the atmospheric backscatter echo-signal that telescopic system receives
First it is divided into three tunnels through fiber coupling and branch apparatus, is then filtered through two-level concatenation all -fiber filter.
As shown in Fig. 2, fiber coupling and branch apparatus include multimode fibre 1 and 1 × 3 optical fiber that connect with multimode fibre 1
Splitter 2, wherein optical fiber splitter 2 is in series by fiber coupler I9 and fiber coupler II10, the output of multimode fibre 1
End is connect with the input arm a0 of fiber coupler I9, and fiber coupler I9 is by coupling ratio 50:50 in output arm a1 and output arm a2
It exports respectively, the output arm a2 of fiber coupler I9 connects with fiber coupler II, and fiber coupler II10 presses coupling ratio 50:50
It is exported in output arm b2 and output arm b3, output arm a1, output arm b2 and output arm b3 are filtered with two-level concatenation all -fiber respectively
Device connection.
The spectral region of fiber coupler I9 and fiber coupler II10 is different.
The energy allocation proportion of output arm a1, output arm b2 and output arm b3 are 5:2.5:2.5.
Two-level concatenation all -fiber filter, including the fiber band-pass filter I3 and and fibre ribbon with output arm a1 welding
The fiber F-P filter I4 of bandpass filter I3 welding forms the fiber band-pass filter of the first optical-fibre channel, output arm b2 welding
II5 and fiber F-P filter II6 with fiber band-pass filter II5 welding forms the second optical-fibre channel, output arm b3 welding
Fiber band-pass filter III7 and fiber F-P filter III8 with fiber band-pass filter III7 welding, form third light
Fine channel.
First optical-fibre channel is steam Raman scattering channel, and the second optical-fibre channel is nitrogen Raman scattering channel, third light
Fine channel is Mie scattering channel.
In the first optical-fibre channel, output arm a1 is welded to the input terminal of fiber band-pass filter I3, optical fiber bandpass filtering
The input port welding of the output end and fiber F-P filter I4 of device I3.
In the second optical-fibre channel, the input terminal welding of output arm b2 and fiber band-pass filter II5, optical fiber bandpass filtering
The input port welding of the output end and fiber F-P filter II6 of device II5.
In third optical-fibre channel, the input terminal welding of output arm b3 and fiber band-pass filter III7, the filter of optical fiber band logical
The input port welding of the output end and fiber F-P filter III8 of wave device III7.
The central wavelength of fiber band-pass filter I3 is 660nm, and for bandwidth in 20~30nm, Out-of-band rejection rate reaches 3 numbers
The spectral characteristic of magnitude；The central wavelength of fiber band-pass filter II5 is 606nm, and bandwidth is reached in 20~30nm, Out-of-band rejection rate
To the spectral characteristic of 3 orders of magnitude；The central wavelength of fiber band-pass filter III7 is 532nm, and for bandwidth in 20~30nm, band is outer
Inhibiting rate reaches the spectral characteristic of 3 orders of magnitude.
The present invention, as optical fiber splitter, is realized using the fiber coupler of tandem and receives echo letter with front end telescope
Number coupling and coupling with subsequent channel optical signal.Using the cascaded structure of fiber coupling, 1 × 3 common light is substituted
Fine splitter, realizes the separation of independent 3 tunnel optical-fibre channels, while obtaining reasonable energy output ratio.
The present invention replaces simple glass type dichroscope using fiber band-pass filter in every road optical-fibre channel, realizes special
Effective filtering of spectral signal in wavelength range.
The present invention uses the optical fiber filter of fiber F-P filter in every road optical-fibre channel.Stringent based on F-P cavity
Wave and filtering characteristic are selected, using fiber F-P cavity structural parameters and through the relationship of spectrum, designs interpolation type fiber F-P cavity structure, it is real
Now to the efficient filtering of special spectrum signal.
The present invention takes the second level optical fiber filtering mode of combination in every road optical-fibre channel.In view of the week of F-P transmission spectrum
Phase characteristic, the present invention propose the secondary light-splitting filter structure combined using fiber band-pass filter and fiber F-P filter.Every road
In optical-fibre channel, fiber band-pass filter and fiber F-P filter have reasonable Spectral matching characteristic, not only guarantee in optical fiber
Just have in the spectral region of bandpass filter and only one F-P is through peak, and believes with the Raman echo of required specific wavelength
Number central wavelength matches, while the use of secondary filter device greatly improves the suppression to elastic Mie scattering signal and spurious signal
Rate processed.
Apparatus of the present invention provide a kind of miniaturization, compact-sized, jamproof high efficiency EO-1 hyperion beam splitting system, can be
The development of new pattern laser radar beam splitting system provides a kind of new technical support.
All -fiber filter of the present invention is realized to required Received Signal in water vapor detecting Raman laser radar system
Efficient fine filtering method, specific filtering are as follows:
Step 1: completing the fiber coupling to Received Signal.By the received Received Signal of telescope through multimode light
Fibre is coupled to fiber optic splitter and optical fiber filter.
Step 2: completing that all -fiber subchannel of Received Signal is arranged.Raman laser thunder is detected for atmosphere vapour
The beam splitting system reached need to extract the Raman scattering echo-signal and rice-Rayleigh scattering of nitrogen and vapour molecule in atmosphere simultaneously
Echo-signal, therefore all -fiber filter should include vapour molecule Raman scattering channel, nitrogen Raman scattering channel and meter -auspicious
Sharp scatter channel.The present invention uses the tandem arrangement of fiber coupler I and fiber coupler II with different spectral regions, replaces
For traditional optical fiber splitter, 1 × 3 optical-fibre channel separation is realized, and export ratio with optimal energy.It is required that splitter is real
The efficient coupling for the spectral signal that existing wave-length coverage is 500-680nm, while requiring energy output ratio is 5:2.5:2.5,
Wherein the first optical-fibre channel is steam Raman scattering channel, and the second optical-fibre channel is nitrogen Raman scattering channel, and third optical fiber is logical
Road is Mie scattering channel.
Step 3: being realized in every road optical-fibre channel and the fine of required Received Signal is filtered.The present invention uses second level
Cascade filtering device is designed using the two-level concatenation of fiber band-pass filter and fiber F-P filter, carries out secondary filtering, point
It Huo get not be in individual fibers channel to atmosphere vapour Raman scattering signal, nitrogen Raman scattering signal and Mie scattering signal
Fine light splitting and efficiently transmission.
In the first optical-fibre channel 1, atmosphere vapour Raman scattering signal will have after fiber band-pass filter I3 filtering
It is input to fiber F-P filter I with signal, carries out finely selecting wave in the output port of fiber F-P filter I4, complete to steam
The fine extraction of Raman echo signal.
In the second optical-fibre channel, nitrogen Raman scattering signal passes through fiber band-pass filter II5, first carries out central wavelength
It in 606nm, certain bandwidth range after the bandpass filtering of spectral signal, reenters and is incident upon fiber F-P filter II6, complete to nitrogen
The fine extraction of gas Raman scattering signal, and subsequent photoelectric conversion and data processing are carried out through photomultiplier tube.
In third optical-fibre channel, Mie scattering signal is first through fiber band-pass filter III7 by 522~542nm's of wavelength
After spectral signal carries out bandpass filtering, then through fiber F-P filter III8 finer filter, in the defeated of fiber F-P filter III8
Exit port completes the fine extraction to Mie scattering signal, and carries out subsequent photoelectric conversion and data processing through photomultiplier tube.
The structural parameters requirement of fiber F-P filter.According to F-P cavity chamber length, reflectivity and penetrate wavelength, free spectrum model
It encloses and the relationship of fineness, and considers the influence being lost in fiber F-P cavity, the structural parameters for completing fiber F-P filter are set
Meter, realizes the transmission of required wavelength under a certain level.The present invention claims fiber F-P cavity insertion loss < 3%, chamber is grown in um magnitude,
Free spectral range reaches tens nm magnitudes, and bandwidth is less than 1nm, is conducive to finely be divided.
The requirement of fiber band-pass filter.It is required that the bandwidth of fiber band-pass filter is less than oneself of fiber F-P filter
By spectral region, meet in the bandwidth range of fiber band-pass filter can only and only one F-P penetrates peak just, realize
To the transmission of specific wavelength spectral signal.The central wavelength of design requirement fiber band-pass filter I, II, III respectively 660nm,
Near 606nm and 532nm, for bandwidth in 20~30nm, Out-of-band rejection rate reaches 3 orders of magnitude.The present invention also requires in each channel
Fiber band-pass filter need to be between optical fiber splitter and fiber F-P filter, and realizes fused fiber splice.
Implementation result: all -fiber filter of the present invention realizes the all-fiber of beam splitting system；It realizes to required atmosphere
The fine of echo-signal is divided and extracts, and obtains the efficient inhibition to spurious signal.
As shown in figure 3, output peak value is 158000 between output arm a1 output spectrum bandwidth 450nm-680nm, can be used for
Vapor channel.The corresponding output spectrum intensity map in output arm b2 and b3 of Fig. 4 and Fig. 5.In the spectrum peak of output arm b2 and b3
Respectively 64000 and 59000, practical splitting ratio is 56:21:23, substantially conforms to 50:25:25.The output of the port output arm b2 and b3
Spectral region can cover the spectral signal of 500-610nm, for the high efficiency coupling to 606nm and 532nm spectral signal.
As shown in fig. 6, fiber band-pass filter I is as level-one light-splitting device, for the center of extracting in the first optical-fibre channel
Wavelength is 660nm, and the spectral signal within the scope of bandwidth 10nm extracts (in figure shown in dotted line)；Again by with fiber F-P filter I
Two-level concatenation (shown in solid in figure), realize a length of 660nm atmosphere vapour Raman scattering signal extracted with high accuracy of centering cardiac wave
(shown in figure dotted line).Two-stage inhibition is carried out to the very noisy in echo-signal simultaneously, greatly improves the inhibiting rate to very noisy,
Exempt very noisy interference.The spectral outputs characteristics of optical-fibre channel 2 and optical-fibre channel 3 can similarly be obtained.
According to the optical property of laser radar parameter and all -fiber light-dividing device, in energy of lasers 300mJ, telescope
Bore 250mm, under the conditions of detection in the time of integration 10 minutes, according to the height of the atmospheric aerosol Mie scattering coefficient of one group of actual measurement
Distribution and ARDC model atmosphere ARDC have carried out numerical simulation calculating to atmosphere vapour detection signal-to-noise ratio, as shown in Figure 7.The result shows that
Under the weather condition of atmospheric visibility 20km, which can realize that about 6km atmosphere vapour below effectively detects at night, white
It effective detection range can reach 3.4km.
Claims (7)
1. a kind of all -fiber filter based on fiber F-P filter, which is characterized in that including fiber coupling interconnected
With branch apparatus and two-level concatenation all -fiber filter；
The fiber coupling and branch apparatus include multimode fibre (1) and 1 × 3 optical fiber connecting with the multimode fibre (1) point
Road device (2), wherein 1 × 3 optical fiber splitter (2) is in series by fiber coupler I (9) and fiber coupler II (10), it is described
The output end of multimode fibre (1) is connect with the input arm a0 of fiber coupler I (9), and the fiber coupler I (9) presses coupling ratio
50:50 is exported respectively in output arm a1 and output arm a2, the output arm a2 and fiber coupler II of the fiber coupler I (9)
(10) it connects, the fiber coupler II (10) is exported by coupling ratio 50:50 in output arm b2 and output arm b3, the output arm
The energy allocation proportion of a1, output arm b2 and output arm b3 are 5:2.5:2.5, and output arm a1, output arm b2 and output arm b3 divide
It is not connect with the two-level concatenation all -fiber filter；
The two-level concatenation all -fiber filter, including with the fiber band-pass filter I (3) of output arm a1 welding and and optical fiber
The fiber F-P filter I (4) of bandpass filter I (3) welding forms the first optical-fibre channel, the fibre ribbon with output arm b2 welding
It is logical to form the second optical fiber by bandpass filter II (5) and fiber F-P filter II (6) with fiber band-pass filter II (5) welding
Road, the fiber F-P with the fiber band-pass filter III (7) of output arm b3 welding and with fiber band-pass filter III (7) welding
Filter III (8) forms third optical-fibre channel；
The atmospheric backscatter echo-signal that telescopic system receives first is divided into three tunnels through fiber coupling and branch apparatus, then
It is filtered through two-level concatenation all -fiber filter.
2. all -fiber filter according to claim 1 based on fiber F-P filter, which is characterized in that the light
Fine coupler I (9) is different with the spectral region of fiber coupler II (10).
3. all -fiber filter according to claim 1 based on fiber F-P filter, which is characterized in that described
One optical-fibre channel is steam Raman scattering channel, and second optical-fibre channel is nitrogen Raman scattering channel, the third optical fiber
Channel is Mie scattering channel.
4. all -fiber filter according to claim 1 or 3 based on fiber F-P filter, which is characterized in that
In one optical-fibre channel, output arm a1 is welded to the input terminal of (3) fiber band-pass filter I, the fiber band-pass filter I (3)
Output end and fiber F-P filter I (4) input port welding.
5. all -fiber filter according to claim 1 or 3 based on fiber F-P filter, which is characterized in that
In two optical-fibre channels, the input terminal welding of output arm b2 and fiber band-pass filter II (5), the fiber band-pass filter II
(5) the input port welding of output end and fiber F-P filter II (6).
6. all -fiber filter according to claim 1 or 3 based on fiber F-P filter, which is characterized in that
In three optical-fibre channels, the input terminal welding of output arm b3 and fiber band-pass filter III (7), the fiber band-pass filter III
(7) the input port welding of output end and fiber F-P filter III (8).
7. all -fiber filter according to claim 1 based on fiber F-P filter, which is characterized in that the light
The central wavelength of fibre ribbons bandpass filter I (3) is 660nm, and bandwidth reaches the light of 3 orders of magnitude in 20~30nm, Out-of-band rejection rate
Spectral property；The central wavelength of the fiber band-pass filter II (5) is 606nm, and bandwidth reaches in 20~30nm, Out-of-band rejection rate
The spectral characteristic of 3 orders of magnitude；The central wavelength of the fiber band-pass filter III (7) is 532nm, bandwidth in 20~30nm,
Out-of-band rejection rate reaches the spectral characteristic of 3 orders of magnitude.
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