CN107134711B - 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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- CN107134711B CN107134711B CN201710492356.5A CN201710492356A CN107134711B CN 107134711 B CN107134711 B CN 107134711B CN 201710492356 A CN201710492356 A CN 201710492356A CN 107134711 B CN107134711 B CN 107134711B
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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
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Abstract
Optical pulse generator based on piezoelectric ceramics feedback control 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 (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 laser is exported using optical detector receiving portion, the optimization that whole system output pulse is realized using singlechip feedbsck control piezoelectric ceramics, finally makes whole system generate stable ultrashort high-speed optical pulse, easy to operate and can reach accurate control.
Description
Technical field
The invention belongs to the technical field of optic communication device, in particular to a kind of light arteries and veins based on piezoelectric ceramics feedback control
Rush generator.
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 optical pulse generator based on piezoelectric ceramics feedback control, for the purpose of generating stable ultrahigh speed pulse.
Technical scheme is as follows:
A kind of optical pulse generator based on piezoelectric ceramics feedback control, structure have, pump light source 1 and wavelength division multiplexer
2 end 980nm is connected, and the end 1550nm of wavelength division multiplexer 2 is connected with the input terminal 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 terminal 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；One of the other end of the optical fiber being wrapped on the first PZT piezoelectric ceramics 7 and the second photo-coupler 8 is defeated
Enter end to be connected；Another input terminal of second photo-coupler 8 is connected with the input terminal 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 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 end of 60% output end as the passive mixed mode-locking pulse generating system of the master based on black phosphorus saturable absorber
Mouthful；One 50% output end of the 4th photo-coupler 12 is connected with the input terminal of the first optical detector 13, another 50% output
End is connected with the input terminal of the second optical detector 18；The output end of first optical 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 first singlechip 15, first singlechip 15 and the first D/A
The input terminal of converter 16 is connected, the input terminal of the output end of the first D/A converter 16 and 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 optical detector 18
End is connected with the input terminal of the second A/D converter 19, output end and 20 phase of second singlechip of the second A/D converter 19
Even, second singlechip 20 is connected with the input terminal of the second D/A converter 21, the output end of the second D/A converter 21 and the
The input terminal of two piezoelectric ceramic actuators 22 is connected, the output end and the 2nd PZT piezoelectric ceramics of the second piezoelectric ceramic actuator 22
23 are connected, and are wrapped in one end of the optical fiber 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 terminal 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 optical fiber 27, single mode optical fiber 27 it is another
End is connected with the other end of the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 23.
The utility model has the advantages that
1, the present invention is based on the optical pulse generators of piezoelectric ceramics feedback control can export high speed ultrashort light pulse, can be with
Passive mode-locking fiber laser system is overcome to be unable to control the disadvantage of output pulse recurrence frequency and repetition rate stability difference, hair
Waving passive mode-locking fiber laser system can produce the advantage of femtosecond light pulse；Active mode-locked fiber can be overcome to swash simultaneously
The disadvantage of light device system output stability difference, mode locked fiber laser system of taking the initiative export the adjustable advantage of repetition rate,
Whole system is set to generate stable ultrashort high-speed optical pulse.
2, 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 stablizes system output；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 finally made to generate stable ultrashort high-speed light arteries and veins
Punching.
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 configuration of the present invention is simple, exports laser using optical detector receiving portion, controls piezoelectricity using singlechip feedbsck
Ceramics realize 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 functional block diagram of optical pulse generator based on piezoelectric ceramics feedback control 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 the Er-doped fiber 10 SM-ESF-7/125 Er-doped fiber of production (Nufern company, the U.S.) is connected, Er-doped fiber 10 it is another
One end 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 be based on black phosphorus saturable absorption
The passive mode-locking fiber laser system of body and the pulse optimization system being made of two automatic feedback control rings, structure be,
40% output end of third photo-coupler 11 and the 4th photo-coupler 12 (1 × 2 standard single mode photo-coupler, splitting ratio 50:
50) input terminal is connected, and 60% output end of third photo-coupler 11 is as the master based on black phosphorus saturable absorber
The output port of passive mixed mode-locking pulse generating system, thus port exports for the light pulse that system generates；4th photo-coupler
13 (the LSIPD-LD50 type optical detection of the quick Micron Technology Co., Ltd in Beijing of 12 50% output end and the first optical detector
Device) input terminal be connected, the 18 (LSIPD- of the quick Micron Technology Co., Ltd in Beijing of another 50% output end and the second optical detector
LD50 type optical detector) input terminal be connected；The output end of first optical detector 13 and the first A/D converter 14 (MAX197)
Input terminal be connected, the output end of the first A/D converter 14 is connected with first singlechip 15 (STC89C51 single-chip microcontroller), first
Single-chip microcontroller 15 receives digital quantity and carries out calculation processing；The input of first singlechip 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 terminal be connected, the output end and first of the first piezoelectric ceramic actuator 17
PZT piezoelectric ceramics 7 (cylindrical piezoelectric ceramics, outer diameter 50mm, internal diameter 40mm, high 50mm) is connected, to control the length of resonant cavity；
The output end of second optical detector 18 is connected with the input terminal 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 microcontroller), and second singlechip 20 receives digital quantity and carries out at calculating
Reason, second singlechip 20 is connected with the input terminal of the second D/A converter 21, the output end of the second D/A converter 21 and the
The input terminal of two piezoelectric ceramic actuators 22 (the homemade device of this seminar, specific structure are 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 terminal of the second optoisolator 24 (1550nm polarization independent optical isolator), the second optoisolator 24
Allowing light pulse is the counter clockwise direction of attached drawing 1 by direction；The output end and dispersion compensating fiber 25 of second optoisolator 24
The one end of (the DCF38 type dispersion compensating fiber of THORLABS company, the U.S.) is connected, the other end of dispersion compensating fiber 25 with it is black
Phosphorus saturable absorber 26 (multilayer black phosphorus is produced on the end face of side fibre-optical splice, with optical fiber connector by this connector with
The fibre-optical splice of the other side is connected, and the standard of Shanghai Han Yu Fibre Optical Communication Technology Co., Ltd production can be used in optical fiber connector
FC/PC optical fiber connector) one end be connected；The other end and (the standard single mode light of single mode optical fiber 27 of black phosphorus saturable absorber 26
It is fine) one end be connected, the other end phase of the other end of single mode optical fiber 27 and the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 23
Even.
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；Er-doped fiber 10 generates gain effect in systems, guarantees operation laser in resonant cavity
Energy 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-part structure, is made
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 to saturable absorber, ultrashort for mode locking
The generation of pulse.
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 first D/A converter 16 exports first singlechip 15
Signal processed is converted to analog signal output to the first piezoelectric ceramic actuator 17, and the first piezoelectric ceramic actuator 17 will receive
Signal amplification is controlled for driving the first PZT piezoelectric ceramics 7, and then controls the length for the optical fiber being entangled on the first PZT piezoelectric ceramics 7
Degree carries out the long compensation of chamber to Active Mode-locked Fiber Laser resonant cavity, 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
Digital 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
Digital signal out carries out calculation 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 are used for the control signal received amplification to drive the 2nd PZT piezoelectric ceramics 23,
The length for the optical fiber being entangled on the 2nd PZT piezoelectric ceramics 23 is controlled, in turn to guarantee based on the passive of black phosphorus saturable absorber
Orphan's type that orphan's type caused by mode locked fiber laser system and Active Mode-locked Fiber Laser resonant cavity generate is certainly
Dynamic matching, and then the ultrashort high-speed optical pulse for exporting whole system is optimized.
Claims (1)
1. a kind of optical pulse generator based on piezoelectric ceramics feedback control, structure have, pump light source (1) and wavelength division multiplexer
(2) the end 980nm is connected, and the end 1550nm of wavelength division multiplexer (2) is connected with the input terminal 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 terminal of the lithium niobate modulator (5) of source (6) driving is connected；The output end of lithium niobate modulator (5) and it is wrapped in the first PZT
One end of optical fiber on piezoelectric ceramics (7) is connected；The other end of the optical fiber being wrapped on the first PZT piezoelectric ceramics (7)
It 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), Er-doped fiber (10)
The other end be 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 optical pulse generator based on piezoelectric ceramics feedback control；4th light
One 50% output end of coupler (12) is connected with the input terminal of the first optical detector (13), another 50% output end and
The input terminal of two optical detectors (18) is connected；The output end of first optical 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 first singlechip (15), first singlechip (15) and first
The input terminal of D/A converter (16) is connected, the output end and the first piezoelectric ceramic actuator of the first D/A converter (16)
(17) input terminal is connected, and the output end of the first piezoelectric ceramic actuator (17) is connected with the first PZT piezoelectric ceramics (7)；Second
The output end of optical detector (18) is connected with the input terminal of the second A/D converter (19), the second A/D converter (19) it is defeated
Outlet is connected with second singlechip (20), and second singlechip (20) is connected with the input terminal of the second D/A converter (21), and second
The output end of D/A converter (21) is connected with the input terminal of the second piezoelectric ceramic actuator (22), the second Piezoelectric Ceramic
The output end of device (22) is connected with the 2nd PZT piezoelectric ceramics (23), is wrapped in one of the optical fiber on the 2nd PZT piezoelectric ceramics (23)
End is connected with 50% output end of the second photo-coupler (8), another 50% output end of the second photo-coupler (8) and the
The input terminal of two optoisolators (24) is connected, one end phase of the output end and dispersion compensating fiber (25) of the second optoisolator (24)
Even, the other end of dispersion compensating fiber (25) is connected with one end of black phosphorus saturable absorber (26)；Black phosphorus saturable absorber
(26) the other end is connected with the one end of single mode optical fiber (27), and the other end of single mode optical fiber (27) is wrapped in second with described
The other end of optical fiber on PZT piezoelectric ceramics (23) is connected.
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