CN103311790B - A kind of adaptive optic fiber coupling of laser beam bidirectional transmit-receive or collimator control system - Google Patents

A kind of adaptive optic fiber coupling of laser beam bidirectional transmit-receive or collimator control system Download PDF

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CN103311790B
CN103311790B CN201310161222.7A CN201310161222A CN103311790B CN 103311790 B CN103311790 B CN 103311790B CN 201310161222 A CN201310161222 A CN 201310161222A CN 103311790 B CN103311790 B CN 103311790B
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optical fiber
fiber
laser
beam
coupling
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CN201310161222.7A
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CN103311790A (en
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耿超
罗文�
李新阳
谭毅
武云云
刘红梅
牟进博
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中国科学院光电技术研究所
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Abstract

The adaptive optic fiber coupling of laser beam bidirectional transmit-receive or a collimator control system, comprise coupling or collimating lens, branch sleeve, location for optical fiber surface device, the first optical fiber, three fiber port circulators, the second optical fiber, the 3rd optical fiber, laser, photodetector, parametric controller and high-voltage amplifier; Wherein, location for optical fiber surface device comprises again flexible rood beam, double piezoelectric crystal chip driver, damping material, boss and holder.The present invention can correct the light beam angle of arrival error because the factors such as atmospheric turbulance, mechanical shock, thermal distoftion cause adaptively, and simultaneously according to the reversibility pricinple of light path, the emission angle also achieving outgoing collimated light beam is corrected.The present invention in the laser space application based on optical fiber, as free space laser communication, laser accurate location, laser radar etc. have important application prospect.

Description

A kind of adaptive optic fiber coupling of laser beam bidirectional transmit-receive or collimator control system

Technical field

The present invention relates to a kind of adaptive optic fiber coupling or collimator control system of laser beam bidirectional transmit-receive, can be used for the space laser application based on optical fiber such as free space laser communication, Laser Atmospheric Transmission, laser accurate location, laser radar.

Background technology

Based in the space laser system of optical fiber, how improving space optical coupling efficiency, reduce signal to noise ratio, is one of key technical problem needing to solve.In fact, due to atmospheric turbulence effect, mechanical platform vibrations and the existence of thermal distoftion, the laser beam arriving receiving terminal can produce angular error, greatly have impact on optical coupling efficiency.Meanwhile, the factors such as the vibrations of atmospheric turbulence effect, mechanical platform and thermal distoftion also can make Emission Lasers bundle produce angular error, have impact on Laser emission precision.Therefore, how calibration of laser angle of arrival error and Laser emission angle error are based on the large difficult point of in the space laser application technology of optical fiber.

Chinese patent application [201110460843.6] " efficient space light-optical fiber coupling method " proposes the driving voltage of the strong and weak Dynamic controlling liquid crystalline phase level controller utilizing PID control circuit according to detection light signal, change the phase place of convergent beam, realize high-efficiency dynamic coupling, but the control precision of this system is not high, and there is inconvenience in the use of liquid crystalline phase level controller.2012, H.Takenaka etc. are by controlling fast steering mirror, alleviate the beam angle errors that atmospheric turbulence effect causes, optical communication (H.Takenaka between the star ground achieving high coupling efficiency, M.Toyoshima, andY.Takayama, " Experimentalverificationoffiber-couplingefficiencyforsat ellite-to-groundatmosphericlaserdownlinks, " OpticsExpress20, 15301-15308 (2012)), but owing to employing inclined mirror, the structure of system is comparatively complicated, dynamic characteristic is poor.2005 and 2011, people (the L.A.Beresnev such as the L.Beresnev of AUS research laboratory, andM.A.Vorontsov, " Designofadaptivefiberopticscollimatorforfree-spacecommun icationlasertransceiver, " Proc.SPIE5895, 58950R (2005)) and the superfine people (C.Geng of Geng of Photoelectric Technology Inst., Chinese Academy of Sciences, X.Li, X.Zhang, andC.Rao, " Coherentbeamcombinationofanopticalarrayusingadaptivefibe ropticscollimators, " OpticsCommunications284, 5531-5536 (2011)) independently have developed one and be called adaptive optical fibre source collimater (Adaptivefiber-opticscollimator, AFOC) device, this device accurately can control the deflection angle of outgoing collimated light beam adaptively in small angle range.Adaptive optical fibre source collimater, liquid crystalline phase level controller and fast steering mirror can realize controlling the deflection of laser beam.Compare with fast steering mirror with liquid crystalline phase level controller, adaptive optical fibre source collimater Direct driver fiber end face, motional inertia is little, and mechanical resonant frequency is high, and compact conformation is conducive to array integrated.According to the reversibility pricinple of light path, adaptive optical fibre source collimater has possessed the possibility realizing adaptive optic fiber coupling.

To sum up, current still do not possess a kind of laser beam that realizes adaptively and be synchronously coupled and the technology of collimated emission, and prior art also exists respective weak point in control precision, dynamic range, system configuration etc.

Summary of the invention

Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of adaptive optic fiber coupling or collimator control system of laser beam bidirectional transmit-receive, the coupled light beam angle of arrival error because the factors such as atmospheric turbulance disturbance, mechanical shock, thermal distoftion cause and outgoing collimated light beam emission angle error can be corrected adaptively, realize correcting the synchronous self-adapting of coupled light beam angle of arrival error and collimated light beam emission angle error, improve laser coupling efficiency and the Laser emission precision of system.

Technical solution of the present invention is: a kind of adaptive optic fiber coupling of laser beam bidirectional transmit-receive or collimator control system, comprise coupling or collimating lens, branch sleeve, location for optical fiber surface device, the first optical fiber, three fiber port circulators, the second optical fiber, the 3rd optical fiber, laser, photodetector, parametric controller and high-voltage amplifier.Wherein, location for optical fiber surface device comprises again flexible rood beam, double piezoelectric crystal chip driver, damping material, boss and holder, one end of two pairs of double piezoelectric crystal chip drivers is connected to the surrounding of holder, the other end is connected with flexible rood beam, the center of flexible rood beam is provided with centre bore, and the first optical fiber is fixed in the centre bore of flexible rood beam through after holder, boss successively.Coupling or collimating lens are embedded in one end of branch sleeve, location for optical fiber surface device is fixed on the other end of branch sleeve, the fiber end face at flexible rood beam place is placed in the back focus position of coupling or collimating lens, location for optical fiber surface device is connected through the transmitted in both directions port of the first optical fiber with three fiber port circulators, the unidirectional input port of three fiber port circulators is connected with laser through the second optical fiber, and the shoot laser of the unidirectional output port of three fiber port circulators is emitted to photodetector.The laser that laser sends transfers to the fiber end face at flexible rood beam place through three fiber port circulators and from fiber end face outgoing, collimates and export after coupling or collimating lens.Arrive the laser beam of adaptive optic fiber coupling or collimater after coupling or collimating lens focus on, the fibre core converging at flexible rood beam place fiber end face is coupled in the first optical fiber, from the 3rd fiber exit and by photoelectric detector after three fiber port circulators, the optical intensity voltage signal real-time Transmission that photodetector obtains is to parametric controller, parametric controller is using coupling light energy as Performance Evaluating Indexes, control algolithm is utilized to produce control signal after high-voltage amplifier amplifies, drive double piezoelectric crystal chip driver, change the position of flexible rood beam place fiber end face in coupling or collimating lens back focal plane, active tracing convergent beam focus, correct adaptively because of atmospheric turbulance, mechanical shock, the light beam angle of arrival error that the factors such as thermal distoftion cause, simultaneously according to the reversibility pricinple of light path, the emission angle also achieving outgoing collimated light beam is corrected.

Described boss and damping material are for improving the resonance characteristic of location for optical fiber surface device, and wherein boss has various structures form, comprise stairstepping, slope shape, vertical shape and other version; Damping material can adopt silicon rubber, visco-elastic damping material, resinous material or other materials.

Described optical fiber can be the optical fiber of monomode fiber, single-mode polarization maintaining fiber, large mode field diameter doubly clad optical fiber, multimode fiber, photonic crystal fiber or other types.

Described flexible rood beam place fiber end face need do polishing milled processed and plate anti-reflection film, and when the high-power transmitting/receiving of laser, fiber end face can do 8 degree of angles or other angle grinding process; In the high occasion of reliability requirement or the high-power transmitting/receiving occasion of laser, flexible rood beam place optical fiber head can be embedded in ceramic insertion core, metal lock pin or other lock pins, or welding one section of optical fiber cap.

Described laser is a kind of laser exported with tail optical fiber, can be fiber laser, semiconductor laser or other lasers.

Described control algolithm controls using coupling light energy as Performance Evaluating Indexes, random paralleling gradient descent algorithm (C.Geng can be adopted, X.Li, X.Zhang, andC.Rao, " Coherentbeamcombinationofanopticalarrayusingadaptivefibe ropticscollimators; " OpticsCommunications284,5531-5536 (2011)), climbing method (Jiang Wenhan etc., " climbing adaptive optics wavefront correction system; " Chinese laser 15,17-21(1986)) etc. blind system optimizing control or other system optimizing control.

The present invention's advantage is compared with prior art:

(1) present invention achieves the bidirectional transmit-receive of laser beam, and achieve the synchronous self-adapting correction to coupled light beam angle of arrival error and collimated light beam emission angle error, improve laser coupling efficiency and the Laser emission precision of system.

(2) present invention employs the beam angle errors aligning gear based on location for optical fiber surface device, Direct driver fiber end face, control precision is high, and motional inertia is little, and mechanical resonant frequency is high, and compact conformation is conducive to array integrated.

(3) in location for optical fiber surface device of the present invention, the resonance characteristic employed based on boss and damping material improves mechanism, improves the resonance frequency of device and the control bandwidth of system.

(4), when the present invention is based on three fiber port circulators, the bidirectional transmit-receive of co-wavelength laser beam can be realized; If substitute three fiber port circulators with optical fibre wavelength division multiplexer, then can realize the bidirectional transmit-receive of multiple different wave length laser beam.

Accompanying drawing explanation

Fig. 1 is the structure chart of adaptive optic fiber of the present invention coupling or collimator control system;

Fig. 2 is the structure chart of location for optical fiber surface device.

Embodiment

As shown in Figure 1 and Figure 2, for the structure chart of adaptive optic fiber of the present invention coupling or collimator control system, comprise coupling or collimating lens 1, branch sleeve 2, location for optical fiber surface device 3, first optical fiber 41, three fiber port circulator 5, second optical fiber 42, the 3rd optical fiber 43, laser 6, photodetector 7, algorithm parametric controller 8 and high-voltage amplifier 9.Wherein, location for optical fiber surface device comprises again flexible rood beam 31, double piezoelectric crystal chip driver 32, damping material 33, boss 34 and holder 35, one end of two pairs of double piezoelectric crystal chip drivers 32 is connected to the surrounding of holder 35, the other end is connected with flexible rood beam 31, the center of flexible rood beam 31 is provided with centre bore, and the first optical fiber 41 is fixed in the centre bore of flexible rood beam 31 through after holder 35, boss 34 successively.

As Fig. 1, shown in Fig. 2, coupling or collimating lens 1 are embedded in one end of branch sleeve 2, location for optical fiber surface device 3 is fixed on the other end of branch sleeve 2, the fiber end face at flexible rood beam 31 place is placed in the back focus position of coupling or collimating lens 1, location for optical fiber surface device 3 is through the first optical fiber 41 and three fiber port circulator 5A ports, namely be that transmitted in both directions port connects, three fiber port circulator 5B ports, namely be that unidirectional input port is connected with laser 6 through the second optical fiber 42, three fiber port circulator 5C ports, namely be that the shoot laser of unidirectional output port is emitted to photodetector 7.

As shown in Figure 1 and Figure 2.The laser that laser 6 sends transfers to the fiber end face at flexible rood beam 31 place through three fiber port circulators 5 and from fiber end face outgoing, collimates and export after coupling or collimating lens 1.Arrive the laser beam of adaptive optic fiber coupling or collimater after coupling or collimating lens 1 focus on, the fibre core converging at flexible rood beam 31 place fiber end face is coupled in the first optical fiber 41, received by photodetector 7 from the 3rd optical fiber 43 outgoing after three fiber port circulators 5, the optical intensity voltage signal real-time Transmission that photodetector 7 obtains is to parametric controller 8, parametric controller 8 is using coupling light energy as Performance Evaluating Indexes, algorithm is utilized to produce control signal after high-voltage amplifier 9 amplifies, drive double piezoelectric crystal chip driver 32, change the position of flexible rood beam 31 place fiber end face in coupling or collimating lens 1 back focal plane, active tracing convergent beam focus, correct adaptively because of atmospheric turbulance, mechanical shock, the light beam angle of arrival error that the factors such as thermal distoftion cause, simultaneously according to the reversibility pricinple of light path, the emission angle also achieving outgoing collimated light beam is corrected.

Embodiment

By adaptive optic fiber coupling or the collimator control system of a kind of laser beam bidirectional transmit-receive of structural design of Fig. 1, Fig. 2.Based on mould field matching theory, optical coupling efficiency obtains maximum 81.45%(P.Winzer when Coupling parameter β=1.13, andW.Leeb, " Fibercouplingefficiencyforrandomlightanditsapplicationst oladar; " OpticsLetters23,986-988 (1998)).Wherein, coupling parameter with to be coupled or the clear aperture of collimating lens 1, optical fiber mode fields radius are directly proportional, and to be coupled or the focal length of collimating lens, optical maser wavelength are inversely proportional to.Accordingly, in the embodiment of the present invention, the first optical fiber 41, second optical fiber 42 and the 3rd optical fiber 43 adopt single-mode polarization maintaining fiber, and optical fiber mode fields radius is 5 μm, and the wavelength of transmission laser is 1064nm; The clear aperture of coupling or collimating lens 1 is 18mm, focal length is 120mm.Now, corresponding Coupling parameter β is 1.13.

The material of branch sleeve 2, location for optical fiber surface device holder 35, boss 34 is LY12 duralumin, flexible rood beam 31 selects titanium alloy material, the version of boss 34 is stairstepping, damping material 33 selects silicon rubber, three fiber port circulators 5 are developed by Shanghai Han Yu Fibre Optical Communication Technology company, model: PMCIR-06-1-2-C-0.5, laser 6 is 1064nm narrow linewidth single-mode polarization maintaining fiber laser.Location for optical fiber surface device 3 tail end optical fiber and three fiber port circulator 5A ports, namely be that transmitted in both directions port connects, laser 6 tail optical fiber and three fiber port circulator 5B ports, namely be that unidirectional input port connects, namely three fiber port circulator 5C ports are that the shoot laser of unidirectional output port is emitted to photodetector 7.Control algolithm in parametric controller 8 adopts random paralleling gradient descent algorithm, see C.Geng, X.Li, X.Zhang, andC.Rao, " Coherentbeamcombinationofanopticalarrayusingadaptivefibe ropticscollimators, " OpticsCommunications284,5531-5536 (2011); Or climbing method (Jiang Wenhan etc., " climbing adaptive optics wavefront correction system, " Chinese laser 15,17-21(1986)) etc. blind system optimizing control.

So far, the present invention completes the detailed description to the coupling of a kind of adaptive optic fiber of laser beam bidirectional transmit-receive or collimator control system.

The present invention can correct the light beam angle of arrival error because the factors such as atmospheric turbulance, mechanical shock, thermal distoftion cause adaptively, and simultaneously according to the reversibility pricinple of light path, the emission angle also achieving outgoing collimated light beam is corrected.The present invention in the laser space application based on optical fiber, as free space laser communication, laser accurate location, laser radar etc. have important application prospect.

The content be not described in detail in specification of the present invention belongs to the known technology of those skilled in the art.

Claims (6)

1. the adaptive optic fiber of laser beam bidirectional transmit-receive is coupled or a collimator control system, it is characterized in that comprising: coupling or collimating lens (1), branch sleeve (2), location for optical fiber surface device (3), the first optical fiber (41), three fiber port circulators (5), the second optical fiber (42), the 3rd optical fiber (43), laser (6), photodetector (7), parametric controller (8) and high-voltage amplifier (9), wherein, location for optical fiber surface device (3) comprises again flexible rood beam (31), double piezoelectric crystal chip driver (32), damping material (33), boss (34) and holder (35), one end of two pairs of double piezoelectric crystal chip drivers (32) is connected to the surrounding of holder (35), the other end is connected with flexible rood beam (31), the center of flexible rood beam (31) is provided with centre bore, and the first optical fiber (41) is successively through being fixed in the centre bore of flexible rood beam (31) after holder (35), boss (34), coupling or collimating lens (1) are embedded in one end of branch sleeve (2), location for optical fiber surface device (3) is fixed on the other end of branch sleeve (2), the fiber end face at flexible rood beam (31) place is placed in the back focus position of coupling or collimating lens (1), location for optical fiber surface device (3) is connected through the transmitted in both directions port of the first optical fiber (41) with three fiber port circulators (5), the unidirectional input port of three fiber port circulators (5) is connected with laser (6) through the second optical fiber (42), the shoot laser of three fiber port circulator (5) unidirectional output ports is emitted to photodetector (7), the laser that laser (6) sends through three fiber port circulators (5) transfer to flexible rood beam (31) place fiber end face and from fiber end face outgoing, output is collimated after coupling or collimating lens (1), arrive the laser beam of adaptive optic fiber coupling or collimater after coupling or collimating lens (1) focus on, the fibre core converging at flexible rood beam (31) place fiber end face is coupled in the first optical fiber (41), to be received from the 3rd optical fiber (43) outgoing by photodetector (7) after three fiber port circulators (5), the optical intensity voltage signal real-time Transmission that photodetector (7) obtains is to parametric controller (8), parametric controller (8) is using coupling light energy as Performance Evaluating Indexes, control algolithm is utilized to produce control signal after high-voltage amplifier (9) amplifies, drive double piezoelectric crystal chip driver (32), change the position of flexible rood beam (31) place fiber end face in coupling or collimating lens (1) back focal plane, active tracing convergent beam focus, correct adaptively because of atmospheric turbulance, mechanical shock, the light beam angle of arrival error that the factors such as thermal distoftion cause, simultaneously according to the reversibility pricinple of light path, the emission angle also achieving outgoing collimated light beam is corrected,
Described boss (34) is stairstepping, slope shape.
2. the adaptive optic fiber of a kind of laser beam bidirectional transmit-receive according to claim 1 is coupled or collimator control system, it is characterized in that: described damping material (33) adopts silicon rubber, visco-elastic damping material, resinous material.
3. the adaptive optic fiber of a kind of laser beam bidirectional transmit-receive according to claim 1 is coupled or collimator control system, it is characterized in that: described the first optical fiber (41), the second optical fiber (42) and the 3rd optical fiber (43) are monomode fiber, large mode field diameter doubly clad optical fiber, multimode fiber or photonic crystal fiber.
4. the adaptive optic fiber of a kind of laser beam bidirectional transmit-receive according to claim 1 is coupled or collimator control system, it is characterized in that: described flexible rood beam (31) place fiber end face need do polishing milled processed and plate anti-reflection film; In the high-power transmitting of laser or when receiving, 8 degree of angle milled processed are done at flexible rood beam (31) place; In the high-power transmitting of laser or reception occasion, flexible rood beam (31) place optical fiber head can be embedded in ceramic insertion core or metal lock pin, or welding one section of optical fiber cap.
5. the adaptive optic fiber of a kind of laser beam bidirectional transmit-receive according to claim 1 is coupled or collimator control system, it is characterized in that: described laser (6) is a kind of laser exported with tail optical fiber.
6. the adaptive optic fiber of a kind of laser beam bidirectional transmit-receive according to claim 1 is coupled or collimator control system, it is characterized in that: the control algolithm of described parametric controller (8) adopts the blind system optimizing control comprising random paralleling gradient descent algorithm or climbing method.
CN201310161222.7A 2013-05-03 2013-05-03 A kind of adaptive optic fiber coupling of laser beam bidirectional transmit-receive or collimator control system CN103311790B (en)

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