CN107039877B - A kind of high stability optical pulse generator - Google Patents
A kind of high stability optical pulse generator Download PDFInfo
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- CN107039877B CN107039877B CN201710492338.7A CN201710492338A CN107039877B CN 107039877 B CN107039877 B CN 107039877B CN 201710492338 A CN201710492338 A CN 201710492338A CN 107039877 B CN107039877 B CN 107039877B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 51
- 239000000835 fiber Substances 0.000 claims abstract description 50
- 239000000919 ceramic Substances 0.000 claims abstract description 41
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 13
- 230000010287 polarization Effects 0.000 claims abstract description 13
- 239000006096 absorbing agent Substances 0.000 claims abstract description 11
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 claims description 27
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 229910052744 lithium Inorganic materials 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005457 optimization Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910003327 LiNbO3 Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1109—Active mode locking
-
- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
A kind of high stability optical pulse generator of the invention belongs to the technical field of optic communication device, its primary structure includes the Active Mode-locked Fiber Laser resonant cavity being made of devices such as pump light source (1), wavelength division multiplexer (2), the first photo-coupler (3), Polarization Controllers (4), and the pulse optimization system that the passive mode-locking fiber laser system being made of devices such as dispersion compensating fiber (23), graphene saturable absorbers (24) and two automatic feedback control rings are constituted.The present invention is using main passive mixed mode-locking technology, laser is exported using optical detector receiving portion, and received signal is handled using single-chip microcontroller and amplifying circuit, control the optimization that piezoelectric ceramics realizes whole system output pulse, finally whole system is made to generate stable ultrashort high-speed optical pulse, it is easy to operate and can reach accurate control.
Description
Technical field
It is the invention belongs to the technical field of optic communication device, in particular to a kind of to be realized using main passive joint mode-locking technique
The optical pulse generator of high stability pulse output.
Background technique
The national economic development is rapid, and the information age has arrived, and Fibre Optical Communication Technology has penetrated into various command, control, communications, and informations
In network.Optical fiber laser is the perfect light source of fiber optic communication, has many advantages compared with traditional solid state laser, in recent years
To have obtained extensive research.Mode locked fiber laser in optical fiber laser is the ideal choosing of light-pulse generator in optical communication system
It selects.
The common structure of mode locked fiber laser has active mode locking and passive mode-locking fiber laser.Wherein active mode locking light
Fibre laser output pulse width is narrow, frequency chirp is small and frequency-tunable, thus has in Ultra-High Speed Optical Communication very big
Application prospect.
It is Active Mode-locked Fiber Laser system as shown in Fig. 2 with the immediate prior art of the present invention, sinusoidal electricity
Press signal function in lithium niobate (LiNbO3) modulator, modulator will generate periodic phase change or loss, periodical
Variation act on the pulse of resonance cavity circulation, influencing each other between them is so that generate mode locking sequence.LiNbO3Modulation
Device be it is Polarization-Sensitive, a Polarization Controller is placed usually before modulator to adjust the light field polarization state of modulator.Center
Wavelength is adjusted by tunable optic filter.
But the spectrum that Active Mode-locked Fiber Laser exports laser is narrow, hardly results in Ultra-short pulse, and actively lock
The chamber of mode fiber laser is long general all longer, is easy to be caused its stability poor by external influence.
Passive mode-locking fiber laser structure is simple, at low cost and high reliablity, is real all-fiber devices, utilizes light
Fine nonlinear effect can produce shortest optical pulse, but its stability for exporting pulse recurrence frequency is poor, cannot be extraneous
Regulation.
In conclusion intrinsic disadvantage is individually present in existing actively or passively mode locked fiber laser system at present,
Especially because effective automatic control is not taken in existing mode locked fiber laser system, so that the stability of output optical pulse
It is poor.
Summary of the invention
The technical problem to be solved by the present invention is to, overcome in background technique mode locked fiber laser there are the shortcomings that, provide
A kind of high stability optical pulse generator using main passive mixed mode-locking technology, to generate stable ultrahigh speed pulse as mesh
's.
Technical scheme is as follows:
A kind of high stability optical pulse generator, structure have, the end the 980nm phase of pump light source 1 and wavelength division multiplexer 2
Even, the end 1550nm of wavelength division multiplexer 2 is connected with the input terminal of the first photo-coupler 3；10% output end of the first photo-coupler 3
It is connected with one end of Polarization Controller 4, the other end of Polarization Controller 4 is defeated with the lithium niobate modulator 5 that is driven by microwave source 6
Enter end to be connected；The output end of lithium niobate modulator 5 is connected with the one end for the optical fiber being wrapped on the first PZT piezoelectric ceramics 7；It is described
The other end for the optical fiber being wrapped on the first PZT piezoelectric ceramics 7 be connected with an input terminal of the second photo-coupler 8；Second
Another input terminal of photo-coupler 8 is connected with the input terminal of the first optoisolator 9；The output end of first optoisolator 9 and
One end of one Er-doped fiber 10 is connected, and the other end of the first Er-doped fiber 10 is connected with the common end of wavelength division multiplexer 2；
It is characterized in that, there are also 90% output ends of the input terminal of third photo-coupler 11 and the first photo-coupler 3 for structure
It is connected, 40% output end of third photo-coupler 11 is connected with the input terminal of the 4th photo-coupler 12, third photo-coupler 11
Output port of 60% output end as the high stability optical pulse generator；One of 4th photo-coupler 12 is 50% defeated
Outlet is connected with the input terminal of the first optical detector 13, the input terminal phase of another 50% output end and the second optical detector 18
Even；The output end of first optical detector 13 is connected with the input terminal of A/D converter 14, the output end of A/D converter 14 with
Single-chip microcontroller 15 is connected, and single-chip microcontroller 15 is connected with the input terminal of D/A converter 16, the output end of D/A converter 16 and first
The input terminal of piezoelectric ceramic actuator 17 is connected, output end and 7 phase of the first PZT piezoelectric ceramics of the first piezoelectric ceramic actuator 17
Even；The output end of second optical detector 18 is connected with the input terminal of amplifying circuit 19, the output end of amplifying circuit 19 and the second pressure
The input terminal of electroceramics driver 20 is connected, output end and 21 phase of the 2nd PZT piezoelectric ceramics of the second piezoelectric ceramic actuator 20
Even, the one end for the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 21 is connected with 50% output end of the second photo-coupler 8,
Another 50% output end of second photo-coupler 8 is connected with the input terminal of the second optoisolator 22, the second optoisolator 22
Output end is connected with one end of dispersion compensating fiber 23, the other end and graphene saturable absorber 24 of dispersion compensating fiber 23
One end be connected；The other end of graphene saturable absorber 24 is connected with one end of single mode optical fiber 25, single mode optical fiber 25 it is another
One end is connected with one end of the second Er-doped fiber 26, and the other end of the second Er-doped fiber 26 and the 2nd PZT that is wrapped in are pressed
The other end of optical fiber on electroceramics 21 is connected.
The utility model has the advantages that
1, the present invention generates the output of high speed ultrashort light pulse using main passive mixing lock technology, can overcome passive mode-locking light
Fibre laser system is unable to control the disadvantage of output pulse recurrence frequency and repetition rate stability difference, plays passive mode-locking optical fiber
Optical Maser System can produce the advantage of femtosecond light pulse；The output of Active Mode-locked Fiber Laser system can be overcome steady simultaneously
The disadvantage of qualitative difference, mode locked fiber laser system of taking the initiative export the adjustable advantage of repetition rate, generate whole system
Stable ultrashort high-speed optical pulse.
2, the present invention stablizes the length of resonant cavity in Active Mode-locked Fiber Laser using feedback signal control piezoelectric ceramics,
Overcome the long drift of chamber, stablizes system output；It is made pottery simultaneously using the piezoelectricity in feedback signal control passive mode-locking fiber laser
Porcelain, optimizes the light pulse in passive mode-locking fiber laser system more, and whole system is finally made to generate stable ultrashort height
Fast light pulse.
3, New Two Dimensional material graphene is generated ultrashort high-speed optical pulse by the present invention, is based on stone
The saturable absorber of black alkene has that ultrashort recovery time, antibody Monoclonal threshold value is high, bandwidth response wave-length coverage is wide, unsaturation absorbs
Low advantage is lost, can produce femtosecond ultrashort pulse.
4, the present invention joined Er-doped fiber in the resonant cavity of passive mode-locking fiber laser, can be to transmitting wherein
Optical signal generate gain amplification, make system export optical pulse energy further increase.
5, the configuration of the present invention is simple exports laser using two optical detectors difference receiving portions, and using single-chip microcontroller and
Amplifying circuit handles received signal, and control piezoelectric ceramics realizes the optimization of whole system output pulse, easy to operate
And it can reach accurate control.
Detailed description of the invention:
Fig. 1 is a kind of functional block diagram of high stability optical pulse generator of the invention.
Fig. 2 is traditional Active Mode-locked Fiber Laser system block diagram.
Specific embodiment
With reference to the accompanying drawing, illustrate the specific structure of each section optical path of the present invention.In embodiment, the subsequent bracket of component
The preferred parameter of the invention of middle mark, but protection scope of the present invention is not limited by these parameters.
Embodiment 1: specific structure of the invention
A kind of optical pulse generator structure based on piezoelectric ceramics feedback control of the invention is as shown in Fig. 1, structure
Have, pump light source 1 (980nm laser, peak power output 1W) and wavelength division multiplexer 2 (980/1550nm wavelength division multiplexer)
The end 980nm be connected, the end 1550nm of wavelength division multiplexer 2 and the first photo-coupler 3 (1 × 2 standard single mode photo-coupler, light splitting
Than being connected for the input terminal of 10:90)；(tail fiber type is mechanically inclined with Polarization Controller 4 for 10% output end of the first photo-coupler 3
Shake controller) one end be connected, output light pulse continued to run in Active Mode-locked Fiber Laser resonant cavity, the first light
The input of 90% output end and third photo-coupler 11 (1 × 2 standard single mode photo-coupler, splitting ratio 40:60) of coupler 3
End is connected；The other end of Polarization Controller 4 and (the vast space Fibre Optical Communication Technology in Shanghai of lithium niobate modulator 5 driven by microwave source 6
The MX-LN-20 light intensity modulator of Co., Ltd) input terminal be connected；The output end of lithium niobate modulator 5 and it is wrapped in first
One end of optical fiber on PZT piezoelectric ceramics 7 is connected；The other end of the optical fiber being wrapped on the first PZT piezoelectric ceramics 7 with
One input terminal of the second photo-coupler 8 (2 × 2 standard single mode photo-couplers, splitting ratio 50:50) is connected；Second optical coupling
Another input terminal of device 8 is connected with the input terminal of the first optoisolator 9 (1550nm polarization independent optical isolator), the first light every
Make the light pulse unidirectional operation in system from device 9, direction is the clockwise direction of attached drawing 1；The output end of first optoisolator 9 with
One end of first Er-doped fiber 10 (the SM-ESF-7/125 Er-doped fiber of Nufern company, U.S. production) is connected, the first er-doped light
The other end of fibre 10 is connected with the common end of wavelength division multiplexer 2.Above structure constitutes traditional Active Mode-locked Fiber Laser
Resonant cavity.
For the present invention on the basis of traditional Active Mode-locked Fiber Laser resonant cavity, there are also inhaled based on graphene saturable
The passive mode-locking fiber laser system of acceptor and the pulse optimization system being made of two automatic feedback control rings, structure
For (1 × 2 standard single mode photo-coupler, splitting ratio are for 40% output end of third photo-coupler 11 and the 4th photo-coupler 12
Input terminal 50:50) is connected, and 60% output end of third photo-coupler 11 is as the high stability optical pulse generator
Output port, thus port exports for the light pulse that system generates；One 50% output end of the 4th photo-coupler 12 and the first light
The input terminal of detector 13 (the LSIPD-LD50 type optical detector of the quick Micron Technology Co., Ltd in Beijing) is connected, another is 50% defeated
Outlet is connected with the input terminal of the second optical detector 18 (the LSIPD-LD50 type optical detector of the quick Micron Technology Co., Ltd in Beijing)；
The output end of first optical detector 13 is connected with the input terminal of A/D converter 14 (MAX197), the output of A/D converter 14
End is connected with single-chip microcontroller 15 (STC89C51 single-chip microcontroller), and single-chip microcontroller 15 receives digital quantity and carries out calculation processing；Single-chip microcontroller 15 and number/
The input terminal of mode converter 16 (AD7541) is connected, 17 (this of the output end of D/A converter 16 and the first piezoelectric ceramic actuator
The homemade device of seminar, specific structure are shown in patent ZL200710055865.8) input terminal be connected, the first Piezoelectric Ceramic
The output end of device 17 and the first PZT piezoelectric ceramics 7 (cylindrical piezoelectric ceramics, outer diameter 50mm, internal diameter 40mm, high 50mm) are connected,
To control the length of resonant cavity；The output end of second optical detector 18 is connected with the input terminal of amplifying circuit 19, amplifying circuit 19
Output end and the second piezoelectric ceramic actuator 20 (the homemade device of this seminar, specific structure are shown in patent
ZL200710055865.8 input terminal) is connected, the output end and the 2nd PZT piezoelectric ceramics 21 of the second piezoelectric ceramic actuator 20
It is connected, is wrapped in one end of the optical fiber on the 2nd PZT piezoelectric ceramics 21 and a 50% output end phase of the second photo-coupler 8
Company, another 50% output end of the second photo-coupler 8 and the second optoisolator 22 (1550nm polarization independent optical isolator)
Input terminal is connected, and the second optoisolator 22 allows light pulse to be the counter clockwise direction of attached drawing 1 by direction；Second optoisolator 22
Output end be connected with one end of dispersion compensating fiber 23 (the DCF38 type dispersion compensating fiber of THORLABS company, the U.S.), color
Multi-layer graphene (is produced on the end of side fibre-optical splice by the other end and graphene saturable absorber 24 for dissipating compensated optical fiber 23
On face, this connector is connected with the fibre-optical splice of the other side with optical fiber connector, the vast space light in Shanghai can be used in optical fiber connector
Fiber communication Technology Co., Ltd. production standard FC/PC optical fiber connector) one end be connected；Graphene saturable absorber 24
The other end is connected with the one end of single mode optical fiber 25 (standard single-mode fiber), the other end of single mode optical fiber 25 and the second Er-doped fiber 26
The one end of the SM-ESF-7/125 Er-doped fiber of production (Nufern company, the U.S.) is connected, the other end of the second Er-doped fiber 26 with
The other end for being wrapped in the optical fiber on the 2nd PZT piezoelectric ceramics 21 is connected.
The effect of the course of work of the invention of embodiment 2 and each main component
In attached structure shown in FIG. 1, laser pumping source of the pump light source 1 as whole system, pump light source 1 passes through wavelength-division
Multiplexer 2 enters in system；The laser of intracavitary operation is divided into two parts by the first photo-coupler 3 that splitting ratio is 10:90, and one
Divide (90%) output to third photo-coupler 11, another part (10%) continuation is transported in Active Mode-locked Fiber Laser resonant cavity
Row；Splitting ratio is that the laser that the first photo-coupler 3 exports is divided into two parts by the third photo-coupler 11 of 40:60, a part
(60%) it is exported as the laser of whole system, another part (40%) is output to feedback of the 4th photo-coupler 12 as system
Signal；Polarization Controller 4 is for the polarization state in control system；First optoisolator 9 is for guaranteeing active mode-locked fiber laser
The unidirectional operation of light in device resonant cavity；First Er-doped fiber 10 generates gain effect in systems, guarantees that operation swashs in resonant cavity
The energy of light is unattenuated；Splitting ratio is that the second photo-coupler 8 of 50:50 is connected to active mode locking and passive mode-locking two parts knot
Structure combines passive mode-locking fiber laser system and Active Mode-locked Fiber Laser system based on graphene organically one
It rises, realizes main passive mixed mode-locking；Graphene saturable absorber 24 is that grapheme material is fabricated to saturable absorber, is used
In the generation of mode-locked ultrashort pulse.Second Er-doped fiber 26 carries out gain amplification in the optical signal wherein transmitted, keeps system defeated
Optical pulse energy out further increases.
4th photo-coupler 12 will receive light and be divided into two-way, be exported all the way to the first optical detector 13, be visited by the first light
It surveys device 13 and converts optical signals to electric current, A/D converter 14 receives the electric signal of the first optical detector 13 output, and will simulation
Signal is converted to digital signal, is allowed to be suitble to subsequent control；Single-chip microcontroller 15 receive A/D converter 14 export digital signal into
Row calculation processing, and generate control signal；The control signal that single-chip microcontroller 15 exports is converted to analog signal by D/A converter 16
It exports to the first piezoelectric ceramic actuator 17, the control signal received amplification is used to drive by the first piezoelectric ceramic actuator 17
First PZT piezoelectric ceramics 7, and then the length for the optical fiber being entangled on the first PZT piezoelectric ceramics 7 is controlled to active mode-locked fiber laser
Device resonant cavity carries out the long compensation of chamber, overcomes the long drift of chamber, guarantees the reliability of system mode locking.
The another output that 4th photo-coupler 12 exports gives the second optical detector 18, and the second optical detector 18 is converted
The second piezoelectric ceramic actuator 20, the second piezoelectric ceramic actuator 20 are given after amplifying for electric signal and by amplifying circuit 19
It will be used to drive the 2nd PZT piezoelectric ceramics 21 after the control signal received amplification, and then control and be entangled in the 2nd PZT piezoelectric ceramics
The length of optical fiber on 21, to guarantee caused by the passive mode-locking fiber laser system based on graphene saturable absorber
Orphan's type Auto-matching that orphan's type and Active Mode-locked Fiber Laser resonant cavity generate, and then export whole system
Ultrashort high-speed optical pulse is optimized.
Claims (1)
1. a kind of high stability optical pulse generator, structure have, the end the 980nm phase of pump light source (1) and wavelength division multiplexer (2)
Even, the end 1550nm of wavelength division multiplexer (2) is connected with the input terminal of the first photo-coupler (3)；The 10% of first photo-coupler (3)
Output end is connected with the one end of Polarization Controller (4), the other end of Polarization Controller (4) and the niobic acid driven by microwave source (6)
The input terminal of lithium modulator (5) is connected；It the output end of lithium niobate modulator (5) and is wrapped on the first PZT piezoelectric ceramics (7)
One end of optical fiber is connected；The other end and the second photo-coupler of the optical fiber being wrapped on the first PZT piezoelectric ceramics (7)
(8) a input terminal is connected；The input terminal phase of another input terminal of the second photo-coupler (8) and the first optoisolator (9)
Even；The output end of first optoisolator (9) is connected with one end of the first Er-doped fiber (10), the first Er-doped fiber (10) it is another
End is connected with the common end of wavelength division multiplexer (2)；
It is characterized in that, there are also 90% output ends of the input terminal of third photo-coupler (11) and the first photo-coupler (3) for structure
It is connected, 40% output end of third photo-coupler (11) is connected with the input terminal of the 4th photo-coupler (12), third photo-coupler
(11) output port of 60% output end as the high stability optical pulse generator；The one of 4th photo-coupler (12)
A 50% output end is connected with the input terminal of the first optical detector (13), another 50% output end and the second optical detector (18)
Input terminal be connected；The output end of first optical detector (13) is connected with the input terminal of A/D converter (14), analog/digital conversion
The output end of device (14) is connected with single-chip microcontroller (15), and single-chip microcontroller (15) is connected with the input terminal of D/A converter (16), D/A
The output end of converter (16) is connected with the input terminal of the first piezoelectric ceramic actuator (17), the first piezoelectric ceramic actuator (17)
Output end be connected with the first PZT piezoelectric ceramics (7)；The output end of second optical detector (18) and the input of amplifying circuit (19)
End is connected, and the output end of amplifying circuit (19) is connected with the input terminal of the second piezoelectric ceramic actuator (20), the second piezoelectric ceramics
The output end of driver (20) is connected with the 2nd PZT piezoelectric ceramics (21), the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics (21)
One end be connected with 50% output end of the second photo-coupler (8), another 50% output end of the second photo-coupler (8)
It is connected with the input terminal of the second optoisolator (22), the one of the output end of the second optoisolator (22) and dispersion compensating fiber (23)
End is connected, and the other end of dispersion compensating fiber (23) is connected with one end of graphene saturable absorber (24)；Graphene can satisfy
It is connected with the other end of absorber (24) with one end of single mode optical fiber (25), the other end of single mode optical fiber (25) and the second er-doped light
The one end of fine (26) is connected, and the other end of the second Er-doped fiber (26) is wrapped on the 2nd PZT piezoelectric ceramics (21) with described
Optical fiber the other end be connected.
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