CN107302176B - A kind of passive mixed mode-locking soliton generation system of high stability master - Google Patents
A kind of passive mixed mode-locking soliton generation system of high stability master Download PDFInfo
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- CN107302176B CN107302176B CN201710492336.8A CN201710492336A CN107302176B CN 107302176 B CN107302176 B CN 107302176B CN 201710492336 A CN201710492336 A CN 201710492336A CN 107302176 B CN107302176 B CN 107302176B
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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
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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
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
- H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based
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Abstract
The passive mixed mode-locking soliton generation system of a kind of high stability master of the invention belongs to the technical field of optic communication device, and 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);The temperature compensation system being made of devices such as dehydrated alcohol filling photonic crystal fiber (29), third optical detector (30), amplifying circuits (31);And the pulse optimization system that the passive mode-locking fiber laser system being made of devices such as dispersion compensating fiber (24), black phosphorus saturable absorbers (25) and two feedback control loops are constituted.The present invention carries out automatic feedback control to actively and passively mode locked fiber laser system using main passive mixed mode-locking, using feedback technique respectively, and has temperature compensation function, optimizes the light pulse in system more, stablizes.
Description
Technical field
The invention belongs to the technical field of optic communication device, in particular to a kind of passive mixed mode-locking light of high stability master is lonely
Sub- generation system.
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
The passive mixed mode-locking soliton pulses generation system of a kind of high stability master based on black phosphorus saturable absorber, to generate stabilization
Ultra high-speed optical pulse for the purpose of.
Technical scheme is as follows:
A kind of passive mixed mode-locking soliton generation system of high stability master, structure have, pump light source 1 and the 5th optocoupler
The input terminal of clutch 27 is connected, and 90% output end of the 5th photo-coupler 27 is connected with the end 980nm of wavelength division multiplexer 2, wavelength-division
The end 1550nm of multiplexer 2 is connected with the input terminal of the first photo-coupler 3;10% output end and polarization of first photo-coupler 3
One end of controller 4 is connected, and 90% output end of the first photo-coupler 3 is connected with the input terminal of third photo-coupler 11;Polarization
The other end of controller 4 is connected with the input terminal of the lithium niobate modulator 5 driven by microwave source 6;The output of lithium niobate modulator 5
It holds and is connected with the one end for the optical fiber being wrapped on PZT piezoelectric ceramics 7;The optical fiber being wrapped on PZT piezoelectric ceramics 7 it is another
One end is connected with an input terminal of the second photo-coupler 8;Another input terminal and the first optoisolator of second photo-coupler 8
9 input terminal is connected;The output end of first optoisolator 9 is connected with one end of Er-doped fiber 10, the other end of Er-doped fiber 10
It is connected with the common end of wavelength division multiplexer 2;
It is characterized in that, there are also the input terminals of 40% output end of third photo-coupler 11 and the 4th photo-coupler 12 for structure
It is connected, 60% output end of third photo-coupler 11 is generated as the passive mixed mode-locking soliton of a kind of high stability master
The output port of system;One 50% output end of the 4th photo-coupler 12 is connected with the input terminal of the first optical detector 13, separately
One 50% output end is connected with the input terminal of the second optical detector 18;The output end and the first analog/digital of first optical detector 13
The input terminal of converter 14 is connected, and the output end of the first A/D converter 14 is connected with first singlechip 15, first singlechip 15
It is connected with the input terminal of D/A converter 16, an input terminal phase of the output end and add circuit 32 of D/A converter 16
Even, the output end of add circuit 32 is connected with the input terminal of piezoelectric ceramic actuator 17, the output end of piezoelectric ceramic actuator 17
It is connected with PZT piezoelectric ceramics 7;One input terminal phase of 10% output end of the 5th photo-coupler 27 and the 6th photo-coupler 28
Even, another input terminal of the 6th photo-coupler 28 is connected with one end of dehydrated alcohol filling photonic crystal fiber 29, dehydrated alcohol
Filling photonic crystal fiber 29 the other end be connected with an output end of the 6th photo-coupler 28, the 6th photo-coupler 28 it is another
One output end is connected with the input terminal of third optical detector 30, the input of the output end and amplifying circuit 31 of third optical detector 30
End is connected, and the output end of amplifying circuit 31 is connected with another input terminal of add circuit 32;The output end of second optical detector 18
It is connected with the input terminal of the second A/D converter 19, the output end of the second A/D converter 19 is connected with second singlechip 20,
Second singlechip 20 is connected with electrical level transferring chip 21, the RS232 interface of electrical level transferring chip 21 and adjustable optic fibre delay line 22
It is connected, the output end of adjustable optic fibre delay line 22 is connected with 50% output end of the second photo-coupler 8, the second photo-coupler
8 another 50% output end is connected with the input terminal of the second optoisolator 23, the output end of the second optoisolator 23 and dispersion
One end of compensated optical fiber 24 is connected, and the other end of dispersion compensating fiber 24 is connected with one end of black phosphorus saturable absorber 25;It is black
The other end of phosphorus saturable absorber 25 is connected with one end of single mode optical fiber 26, and the other end and the adjustable optic fibre of single mode optical fiber 26 prolong
The input terminal of slow line 22 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 mixed mode-locking fiber ring laser system structure, can
To overcome the disadvantage of Active Mode-locked Fiber Laser system output stability difference, mode locked fiber laser system of taking the initiative output
The adjustable advantage of repetition rate, while passive mode-locking fiber laser system can be overcome to be unable to control output pulse recurrence frequency
And the disadvantage of repetition rate stability difference, playing passive mode-locking fiber laser system can produce the excellent of femtosecond light pulse
Gesture;Whole system is set to generate stable ultrashort high-speed optical pulse.
2, the present invention inputs feedback signal into single-chip microcontroller by transformation, and single-chip microcontroller may be implemented to the accurate of feedback signal
Control.It is long to stablize Active Mode-locked Fiber Laser system chamber using feedback signal control piezoelectric ceramics, overcomes the long drift of chamber, make be
System output is stablized;Adjustable optic fibre delay line is controlled using feedback signal simultaneously, carries out Time-delayed Feedback, makes light pulse in system more
Add optimization, whole system is finally made to generate stable ultrashort high-speed optical pulse.
3, New Two Dimensional material black phosphorus is carried out passive mode-locking as saturable absorber and generates ultrashort high-speed light by the present invention
Pulse, the saturable absorber based on black phosphorus have ultrashort recovery time, and black phosphorus material has the band structure of direct band gap, inhales
The advantages that wave-length coverage is big is received, can produce femtosecond ultrashort pulse.
4, the present invention has temperature compensation function, can compensate automatically Active Mode-locked Fiber Laser according to variation of ambient temperature
The long variation of system chamber keeps output soliton pulses more stable.
5, the configuration of the present invention is simple exports laser using optical detector receiving portion, is controlled using singlechip feedbsck adjustable
Fibre delay line realizes the optimization of whole system output pulse, easy to operate and can reach accurate control.
Detailed description of the invention:
Fig. 1 is a kind of passive mixed mode-locking soliton generation system block diagram of high stability master 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 high stability master of the invention is passive, and mixed mode-locking soliton generation system structure is as shown in Fig. 1, knot
Structure has, pump light source 1 (980nm laser, peak power output 1W) and 27 (1 × 2 standard single mode optocoupler of the 5th photo-coupler
Clutch, splitting ratio 10:90) input terminal be connected, 90% output end of the 5th photo-coupler 27 and wavelength division multiplexer 2
The end 980nm is connected, and the end 980nm of wavelength division multiplexer 2 (980/1550nm wavelength division multiplexer) is connected, wavelength division multiplexer 2
The input terminal of the end 1550nm and the first photo-coupler 3 (1 × 2 standard single mode photo-coupler, splitting ratio 10:90) is connected;First
10% output end of photo-coupler 3 is connected with the one end of Polarization Controller 4 (the mechanical Polarization Controller of tail fiber type), output
Light pulse continues to run in Active Mode-locked Fiber Laser resonant cavity, 90% output end and third light of the first photo-coupler 3
The input terminal of coupler 11 (1 × 2 standard single mode photo-coupler, splitting ratio 40:60) is connected;The other end of Polarization Controller 4
With (the MX-LN-20 luminous intensity tune of Shanghai Han Yu Fibre Optical Communication Technology Co., Ltd of lithium niobate modulator 5 driven by microwave source 6
Device processed) input terminal be connected;One end of the output end of lithium niobate modulator 5 and the optical fiber being wrapped on the first PZT piezoelectric ceramics 7
It is connected;8 (2 × 2 standard single modes of the other end and the second photo-coupler of the optical fiber being wrapped on the first PZT piezoelectric ceramics 7
Photo-coupler, splitting ratio 50:50) an input terminal be connected;Another input terminal and the first light of second photo-coupler 8 every
Input terminal from device 9 (1550nm polarization independent optical isolator) is connected, and the first optoisolator 9 transports the light pulse in system unidirectionally
Row, direction is the clockwise direction of attached drawing 1;(Nufern company, the U.S. is raw for the output end and Er-doped fiber 10 of first optoisolator 9
The SM-ESF-7/125 Er-doped fiber of production) one end be connected, the common end phase of the other end and wavelength division multiplexer 2 of Er-doped fiber 10
Even.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 be based on black phosphorus saturable absorption
The passive mode-locking fiber laser system of body, the temperature compensation system based on dehydrated alcohol filling photonic crystal fiber, Yi Jiyou
The pulse optimization system that two automatic feedback control rings are constituted, structure is 40% output end of third photo-coupler 11 and the 4th
The input terminal of photo-coupler 12 (1 × 2 standard single mode photo-coupler, splitting ratio 50:50) is connected, third photo-coupler 11
Output port of 60% output end as the passive mixed mode-locking soliton generation system of a kind of high stability master, system produce
Thus port exports for raw light pulse;(Beijing is quick with the first optical detector 13 for one 50% output end of the 4th photo-coupler 12
The LSIPD-LD50 type optical detector of Micron Technology Co., Ltd) input terminal be connected, another 50% output end and the second light spy
The input terminal for surveying device 18 (the LSIPD-LD50 type optical detector of the quick Micron Technology Co., Ltd in Beijing) is connected;First optical detector 13
Output end be connected with the input terminal of the first A/D converter 14 (MAX197), the output end of the first A/D converter 14 and
One single-chip microcontroller 15 (STC89C51 single-chip microcontroller) is connected, and first singlechip 15 receives digital quantity and carries out calculation processing;First singlechip
15 are connected with the input terminal of D/A converter 16 (AD7541), and one of the output end of D/A converter 16 and add circuit 32
Input terminal is connected, and the output end of add circuit 32 with piezoelectric ceramic actuator 17 (be shown in by the homemade device of this seminar, specific structure
Patent ZL200710055865.8) input terminal be connected, the output end of piezoelectric ceramic actuator 17 and 7 (cylinder of PZT piezoelectric ceramics
Shape piezoelectric ceramics, outer diameter 50mm, internal diameter 40mm, high 50mm) it is connected, to control the length of resonant cavity;5th photo-coupler 27
One input terminal phase of 10% output end and the 6th photo-coupler 28 (2 × 2 standard single mode photo-couplers, splitting ratio 50:50)
Even, another input terminal of the 6th photo-coupler 28 is connected with one end of dehydrated alcohol filling photonic crystal fiber 29, dehydrated alcohol
Filling photonic crystal fiber 29 (is filled out by the airport of the PM-1550-01 photonic crystal fiber of NKT Photonics company production
Fill dehydrated alcohol composition) the other end be connected with an output end of the 6th photo-coupler 28, the 6th photo-coupler 28 it is another
The input terminal phase of output end and third optical detector 30 (the LSIPD-LD50 type optical detector of the quick Micron Technology Co., Ltd in Beijing)
Even, the output end of third optical detector 30 is connected with the input terminal of amplifying circuit 31, output end and the addition electricity of amplifying circuit 31
Another input terminal on road 32 is connected;The input of the output end of second optical detector 18 and the second A/D converter 19 (MAX197)
End is connected, and the output end of the second A/D converter 19 is connected with second singlechip 20 (STC89C51 single-chip microcontroller), second singlechip
20, which receive digital quantity, carries out calculation processing, and second singlechip 20 is connected with electrical level transferring chip 21 (MAX232), level conversion core
Piece 21 and (the electronic optical fiber of VDL-40-15-S9-1-FA type of Sichuan space fixed star Micron Technology Co., Ltd of adjustable optic fibre delay line 22
Delay line) RS232 control terminal be connected, make adjustable optic fibre delay line 22 receive control signal, carry out Time-delayed Feedback, systems stabilisation
The light pulse of generation, the output end of adjustable optic fibre delay line 22 are connected with 50% output end of the second photo-coupler 8, and second
The input terminal phase of another 50% output end of photo-coupler 8 and the second optoisolator 23 (1550nm polarization independent optical isolator)
Even, the second optoisolator 23 allows light pulse to be the counter clockwise direction of attached drawing 1 by direction;The output end of second optoisolator 23
It is connected with one end of dispersion compensating fiber 24 (the DCF38 type dispersion compensating fiber of THORLABS company, the U.S.), dispersion compensation light
The other end and black phosphorus saturable absorber 25 of fibre 24 (make by oneself, and multilayer black phosphorus is produced on side fibre-optical splice by this seminar
On end face, this connector is connected with the fibre-optical splice of the other side with optical fiber connector, the vast space in Shanghai can be used in optical fiber connector
Fibre Optical Communication Technology Co., Ltd production standard FC/PC optical fiber connector) one end be connected;Black phosphorus saturable absorber 25
The other end is connected with the one end of single mode optical fiber 26 (standard single-mode fiber), the other end and adjustable optic fibre delay line of single mode optical fiber 26
22 input terminal 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 the 5th
Photo-coupler 27, a part of (90%) output are entered in system by wavelength division multiplexer 2;Splitting ratio is the first optocoupler of 10:90
The laser of intracavitary operation is divided into two parts by clutch 3, and a part of (90%) output is to third photo-coupler 11, another part
(10%) continue to run in Active Mode-locked Fiber Laser resonant cavity;The third photo-coupler 11 that splitting ratio is 40:60 is by the
The laser of one photo-coupler 3 output is divided into two parts, and a part of (60%) is exported as the laser of whole system, another part
(40%) it is output to feedback signal of the 4th photo-coupler 12 as system;Polarization Controller 4 is for the polarization in control system
State;First optoisolator 9 is used to guarantee the unidirectional operation of light in Active Mode-locked Fiber Laser resonant cavity;Er-doped fiber 10 is being
Gain effect is generated in system, guarantees that the energy of operation laser in resonant cavity is unattenuated;Splitting ratio is the second photo-coupler of 50:50
8 are connected to active mode locking and passive mode-locking two-part structure, make the passive mode-locking fiber laser system based on black phosphorus and are based on
The Active Mode-locked Fiber Laser system of PZT combines, and realizes main passive mixed mode-locking;Black phosphorus saturable absorption
Body 25 is that black phosphorus material is fabricated to saturable absorber, the generation for mode-locked ultrashort pulse.5th photo-coupler 27
10% output end is connected with an input terminal of the 6th photo-coupler 28, another input terminal of the 6th photo-coupler 28 and anhydrous second
One end that alcohol fills photonic crystal fiber 29 is connected, and dehydrated alcohol fills the other end and the 6th optical coupling of photonic crystal fiber 29
One output end of device 28 is connected, and another output end of the 6th photo-coupler 28 is connected with the input terminal of third optical detector 30,
It is a temperature sensor that dehydrated alcohol, which fills photonic crystal fiber 29, can cause the laser by it when the environmental temperature is changed
Phase generate variation, and then change third optical detector 30 output electric current, then through amplifying circuit 31 amplification after output to plus
One input terminal of method circuit 32.
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, the first A/D converter 14 receives the electric signal of the first optical detector 13 output, and will
Analog signal is converted to digital signal, is allowed to be suitble to subsequent control;First singlechip 15 receives the output of the first A/D converter 14
Digital signal carry out calculation processing, and generate control signal;The control that D/A converter 16 exports first singlechip 15 is believed
Analog signal output number is converted to another input terminal of add circuit 32, add circuit 32 believes the output of amplifying circuit 31
Number (reflection temperature change) exports after being added with the output signal (variation of reflection output intensity) of D/A converter 16 and gives piezoelectricity pottery
Porcelain driver 17, the control signal received amplification is used to drive PZT piezoelectric ceramics 7 by piezoelectric ceramic actuator 17, and then controls
The length for making the optical fiber being entangled on PZT piezoelectric ceramics 7 carries out the long compensation of chamber to Active Mode-locked Fiber Laser resonant cavity, to protect
The reliability of card 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 delay of feedback of the passive mode-locking fiber laser system based on black phosphorus saturable absorber is used for for electric current;Second analog/digital turns
Parallel operation 19 receives the electric signal of the second optical detector 18 output, and converts analog signals into digital signal, second singlechip 20
The digital signal for receiving the output of the second A/D converter 19 carries out calculation processing, and generates control signal, electrical level transferring chip 21
For connecting the RS232 control terminal of second singlechip 20 and adjustable optic fibre delay line 22;Adjustable optic fibre delay line 22 is set to receive the
The control signal of two single-chip microcontrollers 20 carries out time delay feed back control, and the light pulse for exporting whole system is optimized.
Claims (1)
1. a kind of passive mixed mode-locking soliton generation system of high stability master, structure have, pump light source (1) and the 5th optocoupler
The input terminal of clutch (27) is connected, the end the 980nm phase of 90% output end and wavelength division multiplexer (2) of the 5th photo-coupler (27)
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), 90% output end of the first photo-coupler (3) and third photo-coupler (11)
Input terminal be connected;The input terminal of the other end of Polarization Controller (4) and the lithium niobate modulator (5) by microwave source (6) driving
It is connected;The output end of lithium niobate modulator (5) is connected with the one end for the optical fiber being wrapped on PZT piezoelectric ceramics (7);Described twines
The other end for the optical fiber being wound on PZT piezoelectric ceramics (7) is connected with an input terminal of the second photo-coupler (8);Second optocoupler
Another input terminal of clutch (8) is connected with the input terminal of the first optoisolator (9);The output end of first optoisolator (9) with
One end of Er-doped fiber (10) is connected, and the other end of Er-doped fiber (10) is connected with the common end of wavelength division multiplexer (2);
It is characterized in that, there are also the input terminals of 40% output end of third photo-coupler (11) and the 4th photo-coupler (12) for structure
It is connected, 60% output end of third photo-coupler (11) is produced as the passive mixed mode-locking soliton of a kind of high stability master
The output port of raw system;The input terminal phase of 50% output end and the first optical detector (13) of 4th photo-coupler (12)
Even, another 50% output end is connected with the input terminal of the second optical detector (18);The output end of first optical detector (13) with
The input terminal of first A/D converter (14) is connected, output end and first singlechip (15) phase of the first A/D converter (14)
Even, first singlechip (15) is connected with the input terminal of D/A converter (16), the output end and addition of D/A converter (16)
One input terminal of circuit (32) is connected, the input terminal phase of the output end and piezoelectric ceramic actuator (17) of add circuit (32)
Even, the output end of piezoelectric ceramic actuator (17) is connected with PZT piezoelectric ceramics (7);10% output of the 5th photo-coupler (27)
End is connected with an input terminal of the 6th photo-coupler (28), and another input terminal of the 6th photo-coupler (28) is filled out with dehydrated alcohol
The one end for filling photonic crystal fiber (29) is connected, and dehydrated alcohol fills the other end and the 6th optical coupling of photonic crystal fiber (29)
One output end of device (28) is connected, another output end of the 6th photo-coupler (28) and the input terminal of third optical detector (30)
It is connected, the output end of third optical detector (30) is connected with the input terminal of amplifying circuit (31), the output end of amplifying circuit (31)
It is connected with another input terminal of add circuit (32);The output end and the second A/D converter (19) of second optical detector (18)
Input terminal be connected, the output end of the second A/D converter (19) is connected with second singlechip (20), second singlechip (20) and
Electrical level transferring chip (21) is connected, and electrical level transferring chip (21) is connected with the RS232 interface of adjustable optic fibre delay line (22), adjustable
The output end of fibre delay line (22) is connected with 50% output end of the second photo-coupler (8), the second photo-coupler (8)
Another 50% output end is connected with the input terminal of the second optoisolator (23), the output end of the second optoisolator (23) and dispersion
One end of compensated optical fiber (24) is connected, one end phase of the other end and black phosphorus saturable absorber (25) of dispersion compensating fiber (24)
Even;The other end of black phosphorus saturable absorber (25) is connected with one end of single mode optical fiber (26), the other end of single mode optical fiber (26)
It is connected with the input terminal of adjustable optic fibre delay line (22).
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