CN107069415A - The passive mixed mode-locking optical pulse generator of master based on graphene saturable absorber - Google Patents
The passive mixed mode-locking optical pulse generator of master based on graphene saturable absorber Download PDFInfo
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- CN107069415A CN107069415A CN201710492340.4A CN201710492340A CN107069415A CN 107069415 A CN107069415 A CN 107069415A CN 201710492340 A CN201710492340 A CN 201710492340A CN 107069415 A CN107069415 A CN 107069415A
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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 optical pulse generator of the master based on graphene saturable absorber 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), the first 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 (21), graphene saturable absorbers (22) 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, the signal of reception is handled using amplifying circuit, control piezoelectric ceramics realizes that whole system exports the optimization of pulse, it is final 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, the master more particularly to based on graphene saturable absorber is passive
Mixed mode-locking optical pulse generation device.
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
The passive mixed mode-locking optical pulse generation device of a kind of master based on graphene saturable absorber, to produce stable superelevation rapid pulse
For the purpose of punching.
Technical scheme is as follows：
A kind of passive mixed mode-locking optical pulse generator of master based on graphene saturable absorber, its structure has, pumping
Light source 1 is connected with the 980nm ends of wavelength division multiplexer 2, the 1550nm ends of wavelength division multiplexer 2 and the input of the first photo-coupler 3
It is connected；10% output end of the first photo-coupler 3 is connected with one end of the first Polarization Controller 4, the first Polarization Controller 4 it is another
The input of lithium niobate modulator 5 of the one end with being driven by microwave source 6 is connected；The output end of lithium niobate modulator 5 is with being wrapped in
One end of optical fiber on first PZT piezoelectric ceramics 7 is connected；The described optical fiber being wrapped on the first PZT piezoelectric ceramics 7 it is another
End is connected with an input of the second photo-coupler 8；Another input of second photo-coupler 8 and the first optoisolator 9
Input be 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 with
The common port of wavelength division multiplexer 2 is connected；
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 optical pulse generator of the master based on graphene 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, and another is 50% defeated
Go out end with the input of the second photo-detector 16 to be connected；The output end of first photo-detector 13 and the input of the first amplifying circuit 14
End is connected, and the output end of the first amplifying circuit 14 is connected with the input of the first piezoelectric ceramic actuator 15, the first piezoelectric ceramics
The output end of driver 15 is connected with the first PZT piezoelectric ceramics 7；The output end of second photo-detector 16 and the second amplifying circuit 17
Input be connected, the output end of the second amplifying circuit 17 is connected with the input of the second piezoelectric ceramic actuator 18, second press
The output end of electroceramics driver 18 is connected with the 2nd PZT piezoelectric ceramics 19, is wrapped in the optical fiber on the 2nd PZT piezoelectric ceramics 19
One end be 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 of two optoisolators 20 is connected, and the output end of the second optoisolator 20 is connected with one end of dispersion compensating fiber 21, color
The other end for dissipating compensated optical fiber 21 is connected with one end of graphene 22；One end phase of the other end of graphene 22 and single-mode fiber 23
Even, the other end of single-mode fiber 23 is connected with one end of the second Polarization Controller 24, the other end of the second Polarization Controller 24 and
The other end of the described optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 19 is connected.
Beneficial effect：
1st, the present invention produces the output of high speed ultrashort light pulse using main passive mixed mode-locking fiber ring laser system structure, can
To overcome the shortcoming of the uncontrollable output pulse recurrence frequency of passive mode-locking fiber laser system and repetition rate stability difference,
The advantage of femtosecond light pulse can be produced by playing passive mode-locking fiber laser system；Active mode-locked fiber can be overcome simultaneously
The shortcoming of Optical Maser System output stability difference, mode locked fiber laser system of taking the initiative output repetition rate is adjustable excellent
Gesture, makes whole system 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, the present invention adds Polarization Controller in the resonator of passive mode-locking fiber laser, thus it is possible to vary wherein
The polarization state of the optical signal of transmission, makes the light pulse that system is exported further be optimized.
4th, New Two Dimensional material graphene is carried out passive mode-locking as saturable absorber and produces ultrashort high speed by the present invention
Light pulse, the saturable absorber based on graphene has ultrashort recovery time, and grapheme material has antibody Monoclonal threshold value height, band
Wide response wave length scope is wide, the low advantage of unsaturation absorption loss, can produce femtosecond ultrashort pulse.
5th, the present invention is simple in construction, exports laser using photo-detector receiving portion, utilizes letter of the amplifying circuit to reception
Number handled, control piezoelectric ceramics realizes that whole system exports the optimization of pulse, it is simple to operate and can reach accurate control.
Brief description of the drawings：
Fig. 1 is the theory diagram 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；10% output end of the first photo-coupler 3 and (the tail fiber type machinery of the first Polarization Controller 4
Formula Polarization Controller) one end be connected, its light pulse exported is continued to run with Active Mode-locked Fiber Laser resonator, the
(1 × 2 standard single mode photo-coupler, splitting ratio is 40 to 90% output end of one photo-coupler 3 with the 3rd photo-coupler 11：60)
Input is connected；The other end of first Polarization Controller 4 and (the vast space optical fiber in Shanghai of lithium niobate modulator 5 driven by microwave source 6
The MX-LN-20 light intensity modulators of telecom technology co., ltd) input be connected；The output end of lithium niobate modulator 5 is with twining
The one end for the optical fiber being wound on the first PZT piezoelectric ceramics 7 is connected；The described optical fiber being wrapped on the first PZT piezoelectric ceramics 7
(2 × 2 standard single mode photo-couplers, splitting ratio is 50 for the other end and the second photo-coupler 8：50) a input is connected；The
Another input of two photo-couplers 8 is connected with the input of the first optoisolator 9 (1550nm polarization independent optical isolators),
First optoisolator 9 makes the light pulse unidirectional operation in system, and direction is the clockwise direction of accompanying drawing 1；First optoisolator 9
Output end is connected with the one end of Er-doped fiber 10 (the SM-ESF-7/125 Er-doped fibers of Nufern companies of U.S. production), er-doped light
The other end of fibre 10 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 also inhaled on the basis of traditional Active Mode-locked Fiber Laser resonator based on graphene saturable
The passive mode-locking fiber laser system of acceptor and the pulse optimization system being made up of two automatic feedback control rings, structure
For, 40% output end of the 3rd photo-coupler 11 and the 4th photo-coupler 12, (1 × 2 standard single mode photo-coupler, splitting ratio is
50：50) input is connected, and 60% output end of the 3rd photo-coupler 11 is as described based on graphene saturable absorber
The passive mixed mode-locking optical pulse generator of master output port, system produce light pulse thus port export；4th optocoupler
One 50% output end of clutch 12 with the first photo-detector 13 (visit by the LSIPD-LD50 types light of the quick Micron Technology Co., Ltd in Beijing
Survey device) input be connected, another 50% output end and the second photo-detector be 16 (the quick Micron Technology Co., Ltd in Beijing
LSIPD-LD50 types photo-detector) input be connected；The output end of first photo-detector 13 is defeated with the first amplifying circuit 14
Enter end to be connected, and the output end of the first amplifying circuit 14 and the first piezoelectric ceramic actuator 15 (the homemade device of this seminar, specifically
Structure is shown in patent ZL200710055865.8) input be connected, the output end of the first piezoelectric ceramic actuator 15 and the first PZT
Piezoelectric ceramics 7 (cylindrical piezoelectric ceramics, external diameter 50mm, internal diameter 40mm, high 50mm) is connected, to control the length of resonator；The
The output end of two photo-detectors 16 is connected with the input of the second amplifying circuit 17, the output end and second of the second amplifying circuit 17
The input of piezoelectric ceramic actuator 18 is connected, output end and the 2nd PZT piezoelectric ceramics 19 of the second piezoelectric ceramic actuator 18
It is connected, the one end for the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics 19 and a 50% output end phase of the second photo-coupler 8
Even, another 50% output end of the second photo-coupler 8 and the second optoisolator 20 (1550nm polarization independent optical isolators)
Input is connected, and the second optoisolator 20 allows the counter clockwise direction that light pulse is accompanying drawing 1 by direction；Second optoisolator 20
Output end be connected with one end of dispersion compensating fiber 21 (the DCF38 types dispersion compensating fiber of THORLABS companies of the U.S.), color
The other end of scattered compensated optical fiber 21 with graphene 22 (made by oneself, and multi-layer graphene is produced on into side fibre-optical splice by this seminar
On end face, this joint is connected with the fibre-optical splice of opposite side with the joints of optical fibre, the joints of optical fibre can use the vast space in Shanghai
Fibre Optical Communication Technology Co., Ltd production the standard FC/PC joints of optical fibre) one end be connected；The other end and list of graphene 22
One end of mode fiber 23 (standard single-mode fiber) is connected, the other end of single-mode fiber 23 and the (tail fiber type of the second Polarization Controller 24
Mechanical Polarization Controller) one end be connected, the other end of the second Polarization Controller 24 and be wrapped in the 2nd PZT piezoelectric ceramics 19
On optical fiber the other end be connected.
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 first Polarization Controller 4 is used in control system；First optoisolator 9 is used to ensure active mode-locked fiber
The unidirectional operation of light in laser resonant cavity；Er-doped fiber 10 produces gain effect in systems, it is ensured that operation swashs in resonator
The energy of light is unattenuated；Splitting ratio is 50：50 the second photo-coupler 8 is connected to active mode locking and passive mode-locking two parts knot
Structure, makes passive mode-locking fiber laser system and Active Mode-locked Fiber Laser system based on graphene organically combine one
Rise, realize main passive mixed mode-locking；Graphene 22 is that graphene is fabricated into saturable absorber, for mode-locked ultrashort pulse
Produce.Second Polarization Controller 24 is used for the polarization state for the optical signal that control is transmitted wherein, obtains the light pulse that system is exported
To further optimization.
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 signal, and by the first amplifying circuit 14 be amplified after export to the first Piezoelectric Ceramic
Device 15, the first piezoelectric ceramic actuator 15 amplifies the control signal received for driving the 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 enter the compensation of an actor's rendering of an operatic tune length to Active Mode-locked Fiber Laser resonator,
The chamber length drift of Active Mode-locked Fiber Laser resonator is effectively overcome, makes system output stable.
Another road of 4th photo-coupler 12 output is exported to the second photo-detector 16, and the second photo-detector 16 is converted
For electric signal, and by the second amplifying circuit 17 be amplified after give the second piezoelectric ceramic actuator 18, the second piezoelectric ceramics drives
Dynamic device 18 amplifies the control signal received for driving the 2nd PZT piezoelectric ceramics 19, and then controls to be entangled in the 2nd PZT piezoelectricity
The length of optical fiber on ceramics 19, to ensure that the passive mode-locking fiber laser system based on graphene saturable absorber is produced
Orphan's type Auto-matching that raw orphan's type is produced with Active Mode-locked Fiber Laser resonator.
Claims (1)
1. a kind of passive mixed mode-locking optical pulse generator of master based on graphene saturable absorber, its structure has, pump light
Source (1) is connected with the 980nm ends of wavelength division multiplexer (2), 1550nm ends and the first photo-coupler (3) of wavelength division multiplexer (2)
Input is connected；10% output end of the first photo-coupler (3) is connected with one end of the first Polarization Controller (4), the first polarization
The input of lithium niobate modulator (5) of the other end of controller (4) with being driven by microwave source (6) is connected；Lithium niobate modulator
(5) one end of optical fiber of the output end with being wrapped on the first PZT piezoelectric ceramics (7) is connected；Described is wrapped in the first PZT pressures
The other end of optical fiber on electroceramics (7) is connected with an input of the second photo-coupler (8)；Second photo-coupler (8)
Another input is connected with the input of the first optoisolator (9)；The output end and Er-doped fiber of first optoisolator (9)
(10) one end is connected, and 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 is used as the passive mixed mode-locking optical pulse generator of the master based on graphene 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), separately
One 50% output end is connected with the input of the second photo-detector (16)；The output end of first photo-detector (13) is put with first
The input of big circuit (14) is connected, the output end of the first amplifying circuit (14) and the input of the first piezoelectric ceramic actuator (15)
End is connected, and the output end of the first piezoelectric ceramic actuator (15) is connected with the first PZT piezoelectric ceramics (7)；Second photo-detector
(16) output end is connected with the input of the second amplifying circuit (17), output end and the second piezoelectricity of the second amplifying circuit (17)
The input of ceramic driver (18) is connected, output end and the 2nd PZT piezoelectric ceramics of the second piezoelectric ceramic actuator (18)
(19) it is connected, one of one end of the optical fiber being wrapped on the 2nd PZT piezoelectric ceramics (19) and the second photo-coupler (8) 50% defeated
Go out end to be connected, another 50% output end of the second photo-coupler (8) is connected with the input of the second optoisolator (20), second
The output end of optoisolator (20) is connected with one end of dispersion compensating fiber (21), the other end and stone of dispersion compensating fiber (21)
One end of black alkene (22) is connected；The other end of graphene (22) is connected with one end of single-mode fiber (23), single-mode fiber (23)
The other end is connected with the one end of the second Polarization Controller (24), and the other end and described of the second Polarization Controller (24) are wrapped in
The other end of optical fiber on 2nd PZT piezoelectric ceramics (19) is connected.
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