CN107134711A - Optical pulse generator based on piezoelectric ceramics feedback control - Google Patents
Optical pulse generator based on piezoelectric ceramics feedback control Download PDFInfo
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- CN107134711A CN107134711A CN201710492356.5A CN201710492356A CN107134711A CN 107134711 A CN107134711 A CN 107134711A CN 201710492356 A CN201710492356 A CN 201710492356A CN 107134711 A CN107134711 A CN 107134711A
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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
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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
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
Abstract
The optical pulse generator based on piezoelectric ceramics feedback control of the present invention belongs to the technical field of optic communication device, its primary structure includes the Active Mode-locked Fiber Laser resonator being made up 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 up of devices such as dispersion compensating fiber (25), black phosphorus saturable absorbers (26) and two automatic feedback control rings are constituted.The present invention is using main passive mixed mode-locking technology, and utilize photo-detector receiving portion output laser, control piezoelectric ceramics to realize that whole system exports the optimization of pulse using singlechip feedbsck, whole system is produced stable ultrashort high-speed optical pulse, it is simple to operate and can reach accurate control.
Description
Technical field
The invention belongs to the technical field of optic communication device, more particularly to a kind of light arteries and veins based on piezoelectric ceramics feedback control
Rush generator.
Background technology
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 preferable choosing of light-pulse generator in optical communication system
Select.
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 very big in Ultra-High Speed Optical Communication
Application prospect.
It is Active Mode-locked Fiber Laser system as shown in Figure 2 with immediate prior art of the invention, sinusoidal electricity
Signal function is pressed in lithium niobate (LiNbO3) modulator, modulator will produce periodic phase place change or loss, periodically
Change act on the pulse of resonance cavity circulation, influencing each other between them is so that produce locked mode sequence.LiNbO3Modulation
Device is Polarization-Sensitive, and a Polarization Controller is placed generally before modulator to adjust the light field polarization state of modulator.Center
Wavelength is adjusted by tunable optic filter.
But the spectrum of Active Mode-locked Fiber Laser output laser is narrow, Ultra-short pulse is hardly resulted in, and actively lock
The chamber length of mode fiber laser is general all longer, easily by external influence, causes its less stable.
Passive mode-locking fiber laser is simple in construction, cost is low and reliability is high, is real all-fiber devices, utilizes light
Fine nonlinear effect, can produce most short optical pulse, but the stability of its output pulse recurrence frequency is poor, it is impossible to extraneous
Regulation and control.
In summary, intrinsic shortcoming is individually present in existing actively or passively mode locked fiber laser system at present,
Effectively automatically controlled especially because not taken in existing mode locked fiber laser system so that the stability of output optical pulse
It is poor.
The content of the invention
The technical problem to be solved in the present invention be the shortcoming that overcomes mode locked fiber laser in background technology to exist there is provided
A kind of optical pulse generator based on piezoelectric ceramics feedback control, for the purpose of producing stable ultrahigh speed pulse.
Technical scheme is as follows：
A kind of optical pulse generator based on piezoelectric ceramics feedback control, its structure has, pump light source 1 and wavelength division multiplexer
2 980nm ends are connected, and the 1550nm ends of wavelength division multiplexer 2 are connected with the input of the first photo-coupler 3；First photo-coupler 3
10% output end be connected with one end of Polarization Controller 4, the other end of Polarization Controller 4 and the niobic acid driven by microwave source 6
The input of lithium modulator 5 is connected；The output end of lithium niobate modulator 5 and the optical fiber that is wrapped on the first PZT piezoelectric ceramics 7
One end is connected；The other end of the described optical fiber being wrapped on the first PZT piezoelectric ceramics 7 and one of the second photo-coupler 8 it is defeated
Enter end to be connected；Another input of second photo-coupler 8 is connected with the input of the first optoisolator 9；First optoisolator 9
Output end be connected with one end of Er-doped fiber 10, the other end of Er-doped fiber 10 is connected with the common port of wavelength division multiplexer 2；
Characterized in that, structure also has the input of the 3rd photo-coupler 11 and 90% output end of the first photo-coupler 3
It is connected, 40% output end of the 3rd photo-coupler 11 is connected with the input of the 4th photo-coupler 12, the 3rd photo-coupler 11
60% output end as the passive mixed mode-locking pulse generating system of the master based on black phosphorus saturable absorber output end
Mouthful；One 50% output end of the 4th photo-coupler 12 is connected with the input of the first photo-detector 13, another 50% output
End is connected with the input of the second photo-detector 18；The output end of first photo-detector 13 is defeated with the first A/D converter 14
Enter end to be connected, the output end of the first A/D converter 14 is connected with the first single-chip microcomputer 15, the first single-chip microcomputer 15 and the first D/A
The input of converter 16 is connected, the output end of the first D/A converter 16 and the input of the first piezoelectric ceramic actuator 17
It is connected, the output end of the first piezoelectric ceramic actuator 17 is connected with the first PZT piezoelectric ceramics 7；The output of second photo-detector 18
End is connected with the input of the second A/D converter 19, output end and the phase of second singlechip 20 of the second A/D converter 19
Even, second singlechip 20 is connected with the input of the second D/A converter 21, the output end of the second D/A converter 21 and the
The input of two piezoelectric ceramic actuators 22 is connected, output end and the 2nd PZT piezoelectric ceramics of the second piezoelectric ceramic actuator 22
23 are connected, the one end for the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 23 and a 50% output end phase of the second photo-coupler 8
Even, another 50% output end of the second photo-coupler 8 is connected with the input of the second optoisolator 24, the second optoisolator 24
Output end be connected with one end of dispersion compensating fiber 25, the other end of dispersion compensating fiber 25 and black phosphorus saturable absorber 26
One end be connected；The other end of black phosphorus saturable absorber 26 is connected with one end of single-mode fiber 27, single-mode fiber 27 it is another
End is connected with the other end of the described optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 23.
Beneficial effect：
1st, the optical pulse generator based on piezoelectric ceramics feedback control of the invention can export high speed ultrashort light pulse, can be with
Overcome the shortcoming of the uncontrollable output pulse recurrence frequency of passive mode-locking fiber laser system and repetition rate stability difference, hair
The advantage of femtosecond light pulse can be produced by waving passive mode-locking fiber laser system；Active mode-locked fiber can be overcome to swash simultaneously
The shortcoming of light device system output stability difference, mode locked fiber laser system of the taking the initiative output adjustable advantage of repetition rate,
Whole system is set to produce stable ultrashort high-speed optical pulse.
2nd, the present invention is long using the stable Active Mode-locked Fiber Laser system chamber of feedback signal control piezoelectric ceramics, overcomes chamber
Long drift, makes system output stable；Simultaneously using feedback signal control passive mode-locking fiber laser in piezoelectric ceramics, make by
Light pulse in dynamic mode locked fiber laser system more optimizes, and whole system is produced stable ultrashort high-speed light arteries and veins
Punching.
3rd, New Two Dimensional material black phosphorus is carried out passive mode-locking as saturable absorber and produces ultrashort high-speed light by the present invention
Pulse, the saturable absorber based on black phosphorus has ultrashort recovery time, and black phosphorus material has the band structure of direct band gap, inhaled
The advantages of wave-length coverage is big is received, femtosecond ultrashort pulse can be produced.
4th, the present invention is simple in construction, and laser is exported using photo-detector receiving portion, and piezoelectricity is controlled using singlechip feedbsck
Ceramics realize that whole system exports the optimization of pulse, simple to operate and can reach accurate control.
Brief description of the drawings：
Fig. 1 is a kind of theory diagram of optical pulse generator based on piezoelectric ceramics feedback control of the present invention.
Fig. 2 is traditional Active Mode-locked Fiber Laser system block diagram.
Embodiment
Below in conjunction with the accompanying drawings, the concrete structure of each several part light path of the present invention is illustrated.In embodiment, the bracket behind component
The preferred parameter of the invention of middle mark, but protection scope of the present invention do not limited by these parameters.
Embodiment 1：The concrete structure of the present invention
The present invention a kind of optical pulse generator structure based on piezoelectric ceramics feedback control as shown in Figure 1, its structure
Have, pump light source 1 (980nm lasers, peak power output is 1W) and wavelength division multiplexer 2 (980/1550nm wavelength division multiplexers)
980nm ends be connected, the 1550nm ends of wavelength division multiplexer 2 and the first photo-coupler 3 (1 × 2 standard single mode photo-coupler, light splitting
Than for 10：90) input is connected；(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, its export light pulse continued to run with Active Mode-locked Fiber Laser resonator, the first light
(1 × 2 standard single mode photo-coupler, splitting ratio is 40 to 90% output end of coupler 3 with the 3rd photo-coupler 11：60) input
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 modulators of Co., Ltd) input be connected；The output end of lithium niobate modulator 5 is with being wrapped in first
One end of optical fiber on PZT piezoelectric ceramics 7 is connected；The other end of the described optical fiber being wrapped on the first PZT piezoelectric ceramics 7 with
(2 × 2 standard single mode photo-couplers, splitting ratio is 50 to second photo-coupler 8：50) a input is connected；Second optical coupling
Another input of device 8 is connected with the input of the first optoisolator 9 (1550nm polarization independent optical isolators), the first light every
Make the light pulse unidirectional operation in system from device 9, direction is the clockwise direction of accompanying drawing 1；The output end of first optoisolator 9 with
One end of the Er-doped fiber 10 SM-ESF-7/125 Er-doped fibers of production (Nufern companies of the U.S.) is connected, Er-doped fiber 10 it is another
One end is connected with the common port of wavelength division multiplexer 2.Said structure constitutes traditional Active Mode-locked Fiber Laser resonator.
The present invention is on the basis of traditional Active Mode-locked Fiber Laser resonator, also based on black phosphorus saturable absorption
The passive mode-locking fiber laser system of body and the pulse optimization system being made up of two automatic feedback control rings, structure is,
(1 × 2 standard single mode photo-coupler, splitting ratio is 50 to 40% output end of the 3rd photo-coupler 11 with the 4th photo-coupler 12：
50) input is connected, and 60% output end of the 3rd photo-coupler 11 is used as the master based on black phosphorus saturable absorber
The output port of passive mixed mode-locking pulse generating system, thus port is exported for the light pulse that system is produced；4th photo-coupler
12 50% output end and (the LSIPD-LD50 type optical detections of the quick Micron Technology Co., Ltd in Beijing of the first photo-detector 13
Device) input be connected, another 50% output end and the (LSIPD- of the quick Micron Technology Co., Ltd in Beijing of the second photo-detector 18
LD50 types photo-detector) input be connected；The output end of first photo-detector 13 and the first A/D converter 14 (MAX197)
Input be connected, the output end of the first A/D converter 14 is connected with the first single-chip microcomputer 15 (STC89C51 single-chip microcomputers), first
Single-chip microcomputer 15 receives digital quantity and carries out calculating processing；The input of first single-chip microcomputer 15 and the first D/A converter 16 (AD7541)
End is connected, the output end of the first D/A converter 16 and the first piezoelectric ceramic actuator 17 (the homemade device of this seminar, tool
Body structure is shown in patent ZL200710055865.8) input be connected, the output end and first of the first piezoelectric ceramic actuator 17
PZT piezoelectric ceramics 7 (cylindrical piezoelectric ceramics, external diameter 50mm, internal diameter 40mm, high 50mm) is connected, to control the length of resonator；
The output end of second photo-detector 18 is connected with the input of the second A/D converter 19 (MAX197), the second A/D converter
19 output end is connected with second singlechip 20 (STC89C51 single-chip microcomputers), and second singlechip 20 receives digital quantity and carried out at calculating
Reason, second singlechip 20 is connected with the input of the second D/A converter 21, the output end of the second D/A converter 21 and the
The input of two piezoelectric ceramic actuators 22 (the homemade device of this seminar, concrete structure is shown in patent ZL200710055865.8)
It is connected, the output end of the second piezoelectric ceramic actuator 22 is connected with the 2nd PZT piezoelectric ceramics 23, is wrapped in the 2nd PZT piezoelectricity pottery
One end of optical fiber on porcelain 23 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 of the second optoisolator 24 (1550nm polarization independent optical isolators), the second optoisolator 24
Allow the counter clockwise direction that light pulse is accompanying drawing 1 by direction；The output end of second optoisolator 24 and dispersion compensating fiber 25
The one end of (the DCF38 types dispersion compensating fiber of THORLABS companies of the U.S.) is connected, the other end of dispersion compensating fiber 25 with it is black
Phosphorus saturable absorber 26 (on the end face that multilayer black phosphorus is produced on to side fibre-optical splice, with the joints of optical fibre by this joint with
The fibre-optical splice of opposite side is connected, the standard that the joints of optical fibre can be produced using Shanghai Han Yu Fibre Optical Communication Technologies Co., Ltd
The FC/PC joints of optical fibre) one end be connected；The other end of black phosphorus saturable absorber 26 and (the standard single mode light of single-mode fiber 27
It is fine) one end be connected, the other end of single-mode fiber 27 and the other end phase for the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 23
Even.
The course of work of the present invention of embodiment 2 and the effect of each critical piece
In structure shown in accompanying drawing 1, pump light source 1 is as the laser pumping source of whole system, and pump light source 1 passes through wavelength-division
Multiplexer 2 enters in system；Splitting ratio is 10：The laser that intracavitary is run is divided into two parts, one by 90 the first photo-coupler 3
(90%) is divided to export to the 3rd photo-coupler 11, another part (10%) continues to transport in Active Mode-locked Fiber Laser resonator
OK；Splitting ratio is 40：The laser that first photo-coupler 3 is exported is divided into two parts by 60 the 3rd photo-coupler 11, a part
(60%) exported as the laser of whole system, another part (40%) is output to the 4th photo-coupler 12 as the feedback of system
Signal；The polarization state that Polarization Controller 4 is used in control system；First optoisolator 9 is used to ensure active mode-locked fiber laser
The unidirectional operation of light in device resonator；Er-doped fiber 10 produces gain effect in systems, it is ensured that operation laser in resonator
Energy is unattenuated；Splitting ratio is 50：50 the second photo-coupler 8 is connected to active mode locking and passive mode-locking two-part structure, makes
Passive mode-locking fiber laser system and Active Mode-locked Fiber Laser system based on black phosphorus combine, and realize
Main passive mixed mode-locking；Black phosphorus saturable absorber 26 is that black phosphorus material is fabricated into saturable absorber, ultrashort for locked mode
The generation of pulse.
4th photo-coupler 12 will receive light and be divided into two-way, export all the way to the first photo-detector 13, be visited by the first light
Survey device 13 and convert optical signals to electric current, the first A/D converter 14 receives the electric signal of the first photo-detector 13 output, and will
Analog signal is converted to data signal, is allowed to be adapted to subsequent control；First single-chip microcomputer 15 receives the first A/D converter 14 and exported
Data signal carry out calculating processing, and produce control signal；The control that first D/A converter 16 exports the first single-chip microcomputer 15
Signal processed is converted to analog signal output to the first piezoelectric ceramic actuator 17, and the first piezoelectric ceramic actuator 17 will be received
Control signal is amplified for driving the first PZT piezoelectric ceramics 7, and then controls the length of optical fiber being entangled on the first PZT piezoelectric ceramics 7
Degree enters the compensation of an actor's rendering of an operatic tune length to Active Mode-locked Fiber Laser resonator, overcomes chamber length to drift about, it is ensured that the reliability of system locked mode.
Another road of 4th photo-coupler 12 output is exported to the second photo-detector 18, and the second photo-detector 18 is converted
Data signal is converted to for electric current and by the second A/D converter 19, it is defeated that second singlechip 20 receives the second A/D converter 19
The data signal that goes out carries out calculating processing, and is converted to analog voltage by the second D/A converter 21 and gives the second piezoelectric ceramics
Driver 22, the second piezoelectric ceramic actuator 22 amplifies the control signal received for driving the 2nd PZT piezoelectric ceramics 23,
And then the length of optical fiber being entangled on the 2nd PZT piezoelectric ceramics 23 is controlled, to ensure based on the passive of black phosphorus saturable absorber
Orphan's type that orphan's type produced by mode locked fiber laser system is produced with Active Mode-locked Fiber Laser resonator is certainly
Dynamic matching, and then optimized the ultrashort high-speed optical pulse of whole system output.
Claims (1)
1. a kind of optical pulse generator based on piezoelectric ceramics feedback control, its structure has, pump light source (1) and wavelength division multiplexer
(2) 980nm ends are connected, and the 1550nm ends of wavelength division multiplexer (2) are connected with the input of the first photo-coupler (3)；First light
10% output end of coupler (3) is connected with one end of Polarization Controller (4), the other end of Polarization Controller (4) with by microwave
The input of the lithium niobate modulator (5) of source (6) driving is connected；The output end of lithium niobate modulator (5) is with being wrapped in the first PZT
One end of optical fiber on piezoelectric ceramics (7) is connected；The other end of the described optical fiber being wrapped on the first PZT piezoelectric ceramics (7)
It is connected with an input of the second photo-coupler (8)；Another input and the first optoisolator of second photo-coupler (8)
(9) input is connected；The output end of first optoisolator (9) is connected with one end of Er-doped fiber (10), Er-doped fiber (10)
The other end be connected with the common port of wavelength division multiplexer (2)；
Characterized in that, structure also has the input of the 3rd photo-coupler (11) and 90% output end of the first photo-coupler (3)
It is connected, 40% output end of the 3rd photo-coupler (11) is connected with the input of the 4th photo-coupler (12), the 3rd photo-coupler
(11) 60% output end is used as the passive mixed mode-locking pulse generating system of the master based on black phosphorus saturable absorber
Output port；One 50% output end of the 4th photo-coupler (12) is connected with the input of the first photo-detector (13), another
Individual 50% output end is connected with the input of the second photo-detector (18)；The output end of first photo-detector (13) and the first mould/
The input of number converter (14) is connected, and the output end of the first A/D converter (14) is connected with the first single-chip microcomputer (15), and first
Single-chip microcomputer (15) is connected with the input of the first D/A converter (16), the output end and first of the first D/A converter (16)
The input of piezoelectric ceramic actuator (17) is connected, and output end and the first PZT piezoelectricity of the first piezoelectric ceramic actuator (17) are made pottery
Porcelain (7) is connected；The output end of second photo-detector (18) is connected with the input of the second A/D converter (19), the second analog
The output end of converter (19) is connected with second singlechip (20), second singlechip (20) and the second D/A converter (21)
Input is connected, and the output end of the second D/A converter (21) is connected with the input of the second piezoelectric ceramic actuator (22), the
The output end of two piezoelectric ceramic actuators (22) is connected with the 2nd PZT piezoelectric ceramics (23), is wrapped in the 2nd PZT piezoelectric ceramics
(23) one end of the optical fiber on is connected with 50% output end of the second photo-coupler (8), the second photo-coupler (8) it is another
Individual 50% output end is connected with the input of the second optoisolator (24), the output end and dispersion compensation of the second optoisolator (24)
One end of optical fiber (25) is connected, and the other end of dispersion compensating fiber (25) is connected with one end of black phosphorus saturable absorber (26)；
The other end of black phosphorus saturable absorber (26) is connected with one end of single-mode fiber (27), the other end of single-mode fiber (27) and institute
The other end for the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics (23) stated is connected.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244746A (en) * | 2020-01-14 | 2020-06-05 | 中国科学院福建物质结构研究所 | Laser system |
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