CN102360131B - Multifunctional high-power polarization preserving fiber isolator - Google Patents
Multifunctional high-power polarization preserving fiber isolator Download PDFInfo
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- CN102360131B CN102360131B CN201110301314.1A CN201110301314A CN102360131B CN 102360131 B CN102360131 B CN 102360131B CN 201110301314 A CN201110301314 A CN 201110301314A CN 102360131 B CN102360131 B CN 102360131B
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Abstract
The invention discloses a multifunctional high-power polarization preserving fiber isolator. The multifunctional high-power polarization preserving fiber isolator is structurally characterized in that a first fiber collimation system, a double-window 90-degree beam splitting polarizer, a Faraday optical rotator, a birefringent crystal and a second fiber collimation system are arranged in sequence along the input direction of light, wherein the second fiber collimation system is arranged reversely; the included angle between the optical axis of the double-window 90-degree beam splitting polarizer and the optical axis of the birefringent crystal is 45 degrees; a third fiber collimation system and a fourth fiber collimation system are respectively arranged at double-window emergent parts at the two sides of the double-window 90-degree beam splitting polarizer. The multifunctional high-power polarization preserving fiber isolator not only can handle high-power input and output, but also has the characteristics of good heat stability and multiple functions; and the increase of monitoring ports is beneficial to stability and safety of the system, thereby achieving good practical applicability.
Description
Technical field
The present invention is novel relates to a kind of fibre optic isolater, is specifically related to a kind of multi-functional polarization preserving fiber isolator that can carry high power input and output.It has solved existing high power isolator poor heat stability from source, and increased monitoring port can be in the situation that not destroying full optical fiber closure the power of Real-Time Monitoring input light polarization, wavelength and back light.If through secondary development, can be used for the intelligent monitoring of full optical fiber high power amplifier and building of protection system.
Technical background
In optical fiber communication, optical information processing and full optical fiber cascade amplification system, the stability of lasing light emitter is vital.But in system, optical fiber and each function element and their junction can run into the inhomogeneous situation of a lot of media as optical interface, thereby can produce scattering in various degree and reflection, form backlight, these backlights are understood the normal output of severe jamming laser instruments, affect the job stability of laser instrument.In order to suppress the harmful effect of backlight, improve the stability of lasing light emitter, adopt a kind of nonreciprocal passive device optoisolator, can oppositely hinder light by the logical light of forward, thereby avoid above-mentioned all adverse effects, improve the reliability of system.Conventional optoisolator has two large classes at present.One class is relevant with polarization, and the insertion loss of optoisolator (or claiming forward loss) is relevant with the polarization direction of incident light.Another kind of and polarization irrelevant, the insertion loss of device does not change with incident light polarization direction.
High-power fiber optic isolator has become restriction high-capacity optical fiber laser at present to one of bottleneck of the development of high power more.To the requirement of optoisolator be that forward loss is low, isolation is high, device volume and temperature drift little etc.Along with the development of high-capacity optical fiber laser, the lifting of the thermal stability of high power isolator becomes a vital problem.If temperature drift does not well solve, thereby the relative position of each optical module can affect the overall performance of isolator because drift occurs expanding with heat and contract with cold of colloid, as forward loss, isolation etc.The first birefringece crystal that at present isolator uses is often for the birefringece crystal of ordinary construction is as Glan prism, and its light that total reflection occurs is all penetrated and on wall, let alone heating and do not utilize with irregular angle, and in high power situation, heating is serious.Isolator is increasing heat radiation area, use cooling block in the classic method aspect solution temperature drift at present.But this method does not solve the heat dissipation problem of isolator from source, and be often accompanied by device volume large, need the special drawback to its heat radiation.
The output power of observing isolator in full Experiments in Fibre Optical is most important, but due to the closure of all optical fiber system, is difficult to observe input light wavelength and degree of polarization, back light power and wavelength in the time observing output power simultaneously.Observe input polarisation of light degree if want, only have external polarization spectroscope etc.; Observe wavelength if want and also need light splitting piece etc., the above device is all complicated, and has destroyed the closure of all optical fiber system.The for example inclined to one side isolator of the guarantor in all optical fiber system, is difficult to its input polarisation of light characteristic of monitoring and does not destroy the closure of system, and whether input polarisation of light degree has well directly affected the stability of Output optical power.Also observe light echo power and wavelength without good method now, but monitoring light echo power and wavelength are most important to the safety of whole fibre system.Particularly in full optical fiber cascade amplifier, easily produce as effects such as stimulated Brillouin scattering (SBS) and spontaneous radiation amplifications (ASE), rear class amplify in the too high or wavelength of light echo power not within isolator working range, the reverse amplification of light echo will produce disastrous effect to pre-amplifier, and the monitoring that is difficult to of light echo makes whole cascade amplifier have very large potential safety hazard.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of Multifunctional high-power polarization preserving fiber isolator is provided, this polarization preserving fiber isolator both can carry high power input and output, had again multi-functional feature.The Heat stability is good of high power isolator, increased monitoring port can be in the situation that not destroying full optical fiber closure power and the wavelength of Real-Time Monitoring input light polarization, wavelength and back light.
Concrete technical solution of the present invention is as follows:
A kind of Multifunctional high-power polarization preserving fiber isolator, feature is that its formation is: be the first fiber optic collimator system, 90 ° of beam splitting polariscopes of double window, faraday's optical rotator, birefringece crystal, the second fiber optic collimator system successively along the input direction of light, the second described fiber optic collimator system is reverse placement, angle between optical axis and the optical axis of birefringece crystal of described 90 ° of beam splitting polariscopes of double window is 45 °, in double window outgoing place of 90 ° of beam splitting polariscope both sides of described double window be inverted respectively the 3rd fiber optic collimator system and the 4th fiber optic collimator system.
First, second, third, fourth described fiber optic collimator system is by optical fiber, kapillary, Gu sleeve pipe and collimation lens form, described optical fiber is with after kapillary parcel, the optical fiber head of described optical fiber is become to have the same inclined-plane of 8 ° and plates to bear high-power anti-reflection film by grinding and polishing with end face capillaceous, described optical fiber head is positioned at the focus of described collimation lens, finally solid with described solid casing pipe sleeve.
Optical fiber in described the first fiber optic collimator system and the second fiber optic collimator system is the partially single cladded-fiber of guarantor, or protects inclined to one side doubly clad optical fiber.
Optical fiber in described the 3rd fiber optic collimator system and the 4th fiber optic collimator system is multimode energy-transmission optic fibre.
Described 90 ° of beam splitting polariscopes of double window are to be made by natural icelandspar crystalline material, the blue type design of possessive case, air-gap structure, o, the mutual vertical output of light beam of two kinds of vibrations of e, not deviation of e light, o light and the logical light face out of plumb of output.
What described birefringece crystal adopted is Glan prism.
The invention has the advantages that:
1,90 ° of beam splitting polariscopes of double window of the present invention, be different from the birefringece crystal of the ordinary construction that isolator used in the past as Glan prism, its light that total reflection occurs is all penetrated and on wall, is let alone heating and do not utilize with irregular angle, and in high power situation, heating is serious.90 ° of beam splitting polariscopes of double window, o, the mutual vertical output of light beam of two kinds of vibrations of e, not deviation of e light, o light and the logical light face out of plumb of output.The present invention focuses on output unit the 3rd fiber optic collimator system and the 4th fiber optic collimator system at two optical fiber of the each reverse placement of double window outgoing place, in increasing by two monitoring ports, also utilizes optical fiber by unnecessary light-output, thereby has avoided used heat generation.All be transmitted on device wall compared to the unnecessary luminous energy of existing polarization fiber isolator device, the present invention has solved heat problem from source, without increasing heat radiation area or use cooling device, has solved the heat problem that restriction high power amplifies, and device volume is little, stable performance.
2, the present invention oppositely puts a fiber optic collimator system (i.e. the 3rd fiber optic collimator system) in outgoing place of input light o light derives o light come from optical fiber, can supply test o luminous power and input optical wavelength, and can monitor at monitoring output light simultaneously.Isolator as inclined to one side in the guarantor in all optical fiber system, whether input polarisation of light degree has well directly affected again the stability of Output optical power, and the present invention can monitor its input polarisation of light characteristic and not destroy the closure of system.Need the external device just can test input polarization degree and need light splitting piece just can measure wavelength simultaneously, destroyed the closure of all optical fiber system compared to technology formerly, this method be simple, integrated level is high, functional diversities and without destroying all optical fiber system.
3, the present invention oppositely puts another colimated light system at the opposite side of 90 ° of beam splitting polariscopes of double window, the 4th fiber optic collimator system derives the o light of back light come from optical fiber, can in monitoring output light, monitor power and the wavelength of back light, break through in the full optical fiber cascade amplifier of conventional art and needed special device test just can record back light power and wavelength and be difficult to realize Real-Time Monitoring.In full optical fiber cascade amplifier, easily produce as effects such as stimulated Brillouin scattering (SBS) and spontaneous radiation amplifications (ASE), the present invention monitors backlight, if power is too high or wavelength can not turn-off in time amplification link within isolator working range, avoid light echo oppositely to amplify pre-amplifier is produced to disastrous effect, make whole cascade amplifier safer.
Accompanying drawing content
Fig. 1 is the structural representation of colimated light system of the present invention.
Fig. 2 is a specific embodiment structural representation of Multifunctional high-power polarization preserving fiber isolator of the present invention.
Fig. 3 is the invention process schematic diagram.
Fig. 4 is the structured flowchart of a concrete application example of the present invention.
In figure: 01-optical fiber; 02-kapillary; The solid sleeve pipe of 03-; 04-lens; 1-the first fiber optic collimator system; 2-the second fiber optic collimator system; 3-the 3rd fiber optic collimator system; 4-the 4th fiber optic collimator system; 90 ° of beam splitting polariscopes of 5-double window; 6-faraday optical rotator; 7-birefringece crystal; 8-main oscillations amplifier seed source; 9-Multifunctional high-power polarization preserving fiber isolator; 10-polarization beam splitting monitoring side; 11-light echo test side; 12-polarization beam splitting monitoring side photoelectric probe; 13-light echo test side photoelectric probe; 14-laser diode pumping source array; 15-all-fiber coupler; 16-Active Optical Fiber; 8 ° of 17-fiber end face grinding and polishings.
Embodiment
Below, the present invention will be further described in conjunction with the accompanying drawings and embodiments, but should not limit the scope of the invention with this.
First refer to Fig. 2, Fig. 2 is specific embodiment structural representation of Multifunctional high-power polarization preserving fiber isolator of the present invention, as seen from the figure, the formation of Multifunctional high-power polarization preserving fiber isolator of the present invention is: be the first fiber optic collimator system 1 successively along the input direction of light, 90 ° of beam splitting polariscopes 5 of double window, faraday's optical rotator 6, birefringece crystal 7, the second fiber optic collimator system 2, the second described fiber optic collimator system 2 is swings to placement, angle between the optical axis of the optical axis of described 90 ° of beam splitting polariscopes 5 of double window and described birefringece crystal 7 is 45 °, in double window outgoing place of 90 ° of beam splitting polariscopes 5 of described double window be inverted respectively the 3rd fiber optic collimator system 3 and the 4th fiber optic collimator system 4.
Refer to Fig. 1, the structural representation that Fig. 1 is colimated light system of the present invention.Described fiber optic collimator system is by optical fiber 01, kapillary 02, Gu sleeve pipe 03 and collimation lens 04 form, after described optical fiber 01 use kapillary 02 parcel, optical fiber head becomes to have the same inclined-plane of 8 ° and plates to bear high-power anti-reflection film with kapillary grinding and polishing, described optical fiber head is positioned at the focus of described collimation lens 04, more solid with described solid sleeve pipe 03 cover.
Refer to Fig. 3, Fig. 3 is fundamental diagram of the present invention.The present invention realizes like this high power laser light isolation and is accompanied by multi-functional and good thermal stability: high power laser light enters in polarization maintaining optical fibre 01, become directional light through collimation lens 04 collimation, rotation double window 90 ° of beam splitting polariscopes 5 make the light of slow-axis direction of polarization maintaining optical fibre parallel with optical axis of crystal direction, and this directional light enters 90 ° of beam splitting polariscopes 5 of double window and is divided into o light and e light; O light is all-trans at 90 ° of beam splitting polariscopes of double window, 5 air-gap places, with light path outgoing in 90 °, enter the 3rd fiber optic collimator system 3, derive through optical fiber, thereby can measure power and the wavelength of input light quick shaft direction light, realize the fast axle cutoff function of protecting inclined to one side isolator; E light is through not deviation of 90 ° of beam splitting polariscopes 5 of double window, directly enter described faraday's optical rotator 6, polarization state is rotated in a clockwise direction 45 °, now polarization direction just and the optical axis of described birefringece crystal 7 parallel, e light focuses on and exports through described polarization maintaining optical fibre 01 through the collimation lens of the second fiber optic collimator system 2 like this, realizes the transmission of forward light.When light oppositely enters the second described fiber optic collimator system 2, become directional light from the second fiber optic collimator system 2, through birefringece crystal 7, directional light is divided into o light beam and e light beam, the light parallel with described birefringece crystal 7 optical axis directions is e light, and e light is through not deviation of birefringece crystal 7; The light that back light is vertical with birefringece crystal 7 optical axis directions is o light, and in polarized systems, often also better event o light quantity is few for the polarization characteristic of back light, and the ejaculation of being all-trans in described birefringece crystal 7 air-gap places; E light enters faraday's optical rotator 6, because the nonreciprocity of faraday's optical rotator, e light still turns clockwise 45 ° through faraday's optical rotator 6 rear polarizer states, inject described 90 ° of beam splitting polariscopes 5 of double window, now polarisation of light direction is vertical with the optical axis direction of described 90 ° of beam splitting polariscopes 5 of double window, there is total reflection in crystal air-gap place, go out to inject the 4th fiber optic collimator system 4 with light path is in 90 °, derive through optical fiber, thereby realize light path isolation and can monitor back light wavelength and slow-axis direction power.In sum, this system derives unnecessary luminous energy by two monitoring ports, can solve from source the heat dissipation problem of high power isolator.
At a full optical fiber cascade amplifier application example, the application of the present invention in system is described below by Multifunctional high-power polarization preserving fiber isolator of the present invention:
As shown in Figure 4, high power main oscillations amplifier seed source 8 is welded to all-fiber coupler 15 signal fibres through Multifunctional high-power polarization preserving fiber isolator 9, again the welding of pigtailed laser diode pumping source array is entered to full coupling fiber 15 pumping fibres, together enter Active Optical Fiber 16,8 ° of Active Optical Fiber 16 output terminal grinding and polishings as 17 directly outputs.Put the luminous power of polarization beam splitting monitoring photoelectric probe 12 another polarization directions of monitoring in polarization beam splitting monitoring side 10; Put light echo monitoring photoelectric probe 13 in light echo monitoring side 10 and monitor light echo power and wavelength; The pin of photoelectric probe 12 is as secondary development as a laser power system part, if photoelectric probe detects power, too high or wavelength has different illustrative system to have potential safety hazard, laser diode pumping source array can be turn-offed in time.
Claims (6)
1. a Multifunctional high-power polarization preserving fiber isolator, be characterised in that its formation is: be the first fiber optic collimator system (1) successively along the input direction of light, 90 ° of beam splitting polariscopes of double window (5), faraday's optical rotator (6), birefringece crystal (7), the second fiber optic collimator system (2), the second described fiber optic collimator system (2) is reverse placement, angle between the optical axis of described 90 ° of beam splitting polariscopes of double window (5) and the optical axis of birefringece crystal (7) is 45 °, in double window outgoing place of 90 ° of beam splitting polariscopes of described double window (5) be inverted respectively the 3rd fiber optic collimator system (3) and the 4th fiber optic collimator system (4).
2. Multifunctional high-power polarization preserving fiber isolator according to claim 1, described in it is characterized in that first, second, the 3rd, the 4th fiber optic collimator system (1, 2, 3, 4) be by optical fiber (01), kapillary (02), Gu sleeve pipe (03) and collimation lens (04) form, described optical fiber (01) is with after kapillary (02) parcel, the optical fiber head of described optical fiber (01) is become to have the same inclined-plane of 8 ° and plates the anti-reflection film that can bear high power laser light by grinding and polishing with the end face of kapillary (02), described optical fiber head is positioned at the focus of described collimation lens (04), finally use described solid sleeve pipe (03) cover solid.
3. Multifunctional high-power polarization preserving fiber isolator according to claim 2, is characterized in that the optical fiber in described the first fiber optic collimator system (1) and the second fiber optic collimator system (2) is the partially single cladded-fiber of guarantor, or protects inclined to one side doubly clad optical fiber.
4. Multifunctional high-power polarization preserving fiber isolator according to claim 2, is characterized in that the optical fiber in described the 3rd fiber optic collimator system (3) and the 4th fiber optic collimator system (4) is multimode energy-transmission optic fibre.
5. Multifunctional high-power polarization preserving fiber isolator according to claim 1, it is characterized in that described 90 ° of beam splitting polariscopes of double window (5) are to be made by natural icelandspar crystalline material, the blue type design of possessive case, air-gap structure, the mutual vertical output of light beam of o, two kinds of vibrations of e, not deviation of e light, o light and the logical light face out of plumb of output.
6. Multifunctional high-power polarization preserving fiber isolator according to claim 1, is characterized in that described birefringece crystal (7) is Glan prism.
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| US9442248B2 (en) * | 2012-03-16 | 2016-09-13 | Nec Corporation | Polarization beam combiner/splitter, polarization beam combining/splitting structure, light mixer, optical modulator module, and method for manufacturing polarization beam combiner/splitter |
| CN103543493B (en) * | 2013-10-29 | 2016-05-11 | 深圳朗光科技有限公司 | A kind of fibre optic isolater and optical fiber laser |
| CN103676005B (en) * | 2013-11-22 | 2016-04-20 | 北京航空航天大学 | Based on the bidirectional optical fiber polarization multiplexer of crystal birefringence effect |
| CN108089352B (en) * | 2018-01-11 | 2021-05-07 | 广东三石园科技有限公司 | Optoelectronic component |
| CN109283706A (en) * | 2018-11-13 | 2019-01-29 | 英诺激光科技股份有限公司 | Hybrid optical isolator |
| CN115097573A (en) * | 2022-06-20 | 2022-09-23 | 武汉电信器件有限公司 | Isolation device and optical communication system |
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| GB2342160B (en) * | 1998-09-30 | 2000-12-13 | Ando Electric | Electro-optic probe |
| US20020005987A1 (en) * | 2000-07-14 | 2002-01-17 | Gonzalo Wills | Polarization beam splitter or combiner |
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Effective date of registration: 20161227 Address after: 210038 Nanjing economic and Technological Development Zone, Jiangsu Road, No. 19 Patentee after: Naijing Zhongke Shenguang Technology Co., Ltd. Address before: 201800 Jiading District 800-211 post office box, Shanghai Patentee before: Shanghai Optical Precision Mechanical Inst., Chinese Academ of Sciences |