CN204116642U - A kind of fibre cladding residual light energy stripper and optical-fiber bundling device - Google Patents
A kind of fibre cladding residual light energy stripper and optical-fiber bundling device Download PDFInfo
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- CN204116642U CN204116642U CN201420543547.1U CN201420543547U CN204116642U CN 204116642 U CN204116642 U CN 204116642U CN 201420543547 U CN201420543547 U CN 201420543547U CN 204116642 U CN204116642 U CN 204116642U
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Abstract
The utility model is applicable to optical technical field, provide a kind of fibre cladding residual light energy stripper and optical-fiber bundling device, fibre cladding residual light energy stripper, comprise fibre core, covering, be coated on the index-coupling medium layer of the finite length outside described covering and the guiding optical waveguide with described index-coupling medium layer exterior surface, the refractive index of described index-coupling medium layer is greater than the refractive index of described covering or coat, and is less than the refractive index of described guiding optical waveguide.The utility model by setting gradually index-coupling medium layer and guiding optical waveguide outside the covering or coat of optical fiber, the refractive index of guiding optical waveguide is made to be greater than the refractive index of index-coupling medium layer, and make the refractive index of index-coupling medium layer be greater than the refractive index of covering or coat, thus the residual light entered in fibre cladding is imported in guiding optical waveguide, thus residual light can not be generated heat around fibre cladding, good reliability, and there is the advantages such as insertion loss is low, package dimension is little, be suitable in large-power optical fiber device.
Description
Technical field
The utility model belongs to optical technical field, particularly relates to a kind of fibre cladding residual light energy stripper and optical-fiber bundling device.
Background technology
The light conduction instrument that optical fiber is total reflection principle in a kind of fiber utilizing light to make at glass or plastics and makes, generally includes fibre core, covering and coat.In use, usually there is following problem in large-power optical fiber device:
1, large-power optical fiber pump energy and signal bundling device part use under high power conditions, must meet and bear the requirement that power is large, coupling efficiency is high, loss is little.Nonetheless, the desired region still having part light cannot enter output optical fibre according to expection is transmitted, as flashlight flee from fibre core and enter glass-clad, pump light is fled from glass-clad and is entered the coat of organic material.The former is after flashlight enters the glass-clad of optical fiber, and in single cladded-fiber, this part flashlight can enter again the outer coat of optical fiber, and light is absorbed by outer coat material thus produces heat; The latter, when pump light is leaked to outer coat from fiber glass covering, can produce a large amount of heats in coat equally outside.When luminous power reaches the above rank of watt, the heat that evanescent wave in the output optical fibre covering of pump combiner or signal bundling device and outer coat produces will make fiber optic temperature sharply rise to up to nearly hundred degrees Celsius or higher, have a strong impact on stability and the reliability of system, under harsh conditions, will fracture and the burning of optical fiber be caused.Because which limit the increase of the luminous power of system, this problem becomes a large bottleneck of signal bundling device and pump combiner.
2, large-power optical fiber bundling device uses under very high power condition, be difficult to avoid having the part optical power feedback from output terminal, feedback light will turn back to input end fiber along device, and on the covering or coat of input end fiber, change into heat, producing amount of heat makes input end temperature rise rapidly, affect properties of product and stability, even catastrophic effect is produced to whole system, the lifting of power-limiting.
3, in the application of fiber laser or amplifier, often be used in welding and the cutting field of the metal material with high reverse--bias, fiber laser or amplifier will be entered into from the reflected light of metal material, this part reflected light major part can enter in the glass-clad of the output optical fibre of fiber laser or amplifier, and the light entering output optical fibre glass-clad will to disappear in coat thus to produce heat.
4, in the high-power full-optical-fiber laser of double clad gain fibre and high-power all-fiber amplifier operation process, both the laser that there is being excited in double clad gain fibre or amplified, also there is pump light, the former is required for us, and will laser spectrum be had an impact from Active Optical Fiber afterbody remnant pump luminous energy out, need filtering remnant pump light for this reason, according to same reason, this part remnant pump light can produce a large amount of heat in single cladded-fiber or remnant pump light stripper, thus causes the reduction of system reliability.
The method of existing solution pumping residual light problem has making fiber grating, is coated with high-index material or draws the methods such as cone process, but when power is larger, said method will produce larger heat, and near optical fiber, local pyrexia is serious, require high to cooling system.Therefore, in optical fiber, the heating problem of remnant pump light becomes one of technical matters urgently to be resolved hurrily in the industry.
Obviously, the heat that in fibre cladding or coat, residual light produces causes very large impact to large-power optical fiber device.Current solution mainly carries out machinery heat radiation at heating region, but because heating is apart from long, and distance optical fiber is too near, dispels the heat very difficult, poor effect, and the design of system also can become very complicated.
Utility model content
The purpose of this utility model is to provide a kind of fibre cladding residual light energy stripper, is intended to the problem that the residual light solved in fibre cladding or coat produces heat, improves the reliability of fiber device.
The utility model realizes like this, a kind of fibre cladding residual light energy stripper, comprise fibre core, covering, be coated on the index-coupling medium layer of the finite length outside described covering and the guiding optical waveguide with described index-coupling medium layer exterior surface, the refractive index of described index-coupling medium layer is greater than the refractive index of described covering, and is less than the refractive index of described guiding optical waveguide.
As optimal technical scheme of the present utility model:
Described covering is single covering.
Described covering is double clad, and described double clad is made up of inner cladding and surrounding layer, and one section of described surrounding layer is removed and exposes inner cladding, and the outside surface in the exposed portion of inner cladding is coated with described index-coupling medium layer and guiding optical waveguide successively.
Be provided with coat at the outside surface of described covering, described index-coupling medium layer is coated on the outside surface of described coat, and the refractive index of described index-coupling medium layer is greater than the refractive index of described coat.
Be provided with coat at the outside surface of described covering, one section of described clad is removed and exposes covering, and the outside surface in the exposed portion of covering is coated with described index-coupling medium layer and guiding optical waveguide successively.
Another object of the present utility model is to provide a kind of optical-fiber bundling device, the output optical fibre comprising many input optical fibres and be coupled with described many input optical fibres, described input optical fibre and output optical fibre include fibre core and covering, the index-coupling medium layer being coated with finite length of described covering and the guiding optical waveguide with described index-coupling medium layer exterior surface, the refractive index of described index-coupling medium layer is greater than the refractive index of described covering, and is less than the refractive index of described guiding optical waveguide.
As optimal technical scheme of the present utility model:
The outside coated guiding optical waveguide of described many input optical fibres is structure as a whole and has the through hole that the described input optical fibre of some confessions passes, described input optical fibre is man-to-man through described through hole, and is fixed in described guiding optical waveguide by described index-coupling medium layer.
Be coated with coat at the outside surface of described covering, described index-coupling medium layer is coated on the outside surface of described coat, and the refractive index of described index-coupling medium layer is greater than the refractive index of described coat.
Be coated with coat at the outside surface of described covering, one section of described coat is removed and exposes covering, and the outside surface in the exposed portion of described covering is coated with described index-coupling medium layer and guiding optical waveguide successively.
Described covering is single covering or double clad;
Described double clad is made up of inner cladding and surrounding layer, and one section of described surrounding layer is removed and exposes inner cladding, and the outside surface in the exposed portion of described inner cladding is coated with described index-coupling medium layer and guiding optical waveguide successively.
The utility model by setting gradually index-coupling medium layer and guiding optical waveguide outside the covering or coat of optical fiber, the refractive index of guiding optical waveguide is made to be greater than the refractive index of index-coupling medium layer, and make the refractive index of index-coupling medium layer be greater than the refractive index of covering or coat, thus the residual light entering fibre cladding is imported in guiding optical waveguide, thus residual light can not be generated heat in fibre cladding or in coat, good reliability, and there is the advantages such as insertion loss is low, package dimension is little, be suitable in large-power optical fiber device.
Accompanying drawing explanation
Fig. 1 is the structural representation of the fibre cladding residual light energy stripper that the utility model first embodiment provides;
Fig. 2 is optical power distribution figure in the refractive index profile of A-A ' and B-B ' section in Fig. 1 and optical fiber;
Fig. 3 is the structural representation of the optical-fiber bundling device that the utility model second embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Below in conjunction with specific embodiment, specific implementation of the present utility model is described in detail:
embodiment one:
The utility model first embodiment provides a kind of fibre cladding residual light energy stripper, it adopts the method for index matching imported among other optical materials by the residual light energy entering fibre cladding or coat and do not generate heat around optical fiber or optical fiber, the light entering this optical material can realize transparent (low-loss) transmission in the material or absorbs gradually and eliminate heating gradually, also edge of materials can be made to contact other objects and be derived by heat, also space is entered into by scattering, thus around optical fiber or optical fiber concentrate heating or thermal value minimum.Concrete reference diagram 1, this fibre cladding residual light energy stripper comprises fibre core 101, covering 102, is coated on the index-coupling medium layer 103 of the finite length outside covering 102 and the guiding optical waveguide 104 with index-coupling medium layer 103 exterior surface, the refractive index of index-coupling medium layer 103 is greater than the refractive index of covering 102, and is less than the refractive index of guiding optical waveguide 104.
This optical fiber can be single cladded-fiber or doubly clad optical fiber, and covering 102 can be glass-clad, also can be the covering of other materials.Index-coupling medium layer 103 and guiding optical waveguide 104 are made by the material of printing opacity good (low absorption loss), index-coupling medium layer 103 is as the transition layer structure between covering 102 and guiding optical waveguide 104, it can be liquid, solid or the transition such as stickum, colloid material, make the Contact of covering, index-coupling medium layer 103 and guiding optical waveguide 104 good, and contribute to leaded light.Guiding optical waveguide 104 can be the optical materials such as liquid, solid or stickum, and the light be exported is had to the characteristic of extremely low absorption.
The principle of work of the utility model embodiment is, residual light L transmits in fibre cladding 102, refractive index due to index-coupling medium layer 103 is greater than the refractive index of covering 102, the guide-lighting condition of covering 102 is destroyed, contact position at covering 102 and index-coupling medium layer 103 reflects and enters in index-coupling medium layer 103 by residual light, the same refractive index due to guiding optical waveguide 104 is greater than the refractive index of index-coupling medium layer 103, and residual light will be directed to guiding optical waveguide 104 further from index-coupling medium layer 103.When fibre cladding 102 and index-coupling medium layer 103 contact length long enough, the residual light in covering 102 all will be exported, thus can residual light in filtering fibre cladding 102.
Represent that in Fig. 1, A-A ' and B-B ' refractive index profile distribute and optical power distribution in optical fiber with reference to figure 2, Fig. 2.Wherein, solid line represents index distribution, represented by dotted arrows optical power distribution.About A-A ' section, fiber core 101 and covering 102 are guided mode simultaneously, and luminous power had both been present in fibre core 101 and has also been present in covering 102.About B-B ' section, from above-mentioned index of refraction relationship, the guided-mode structure of fibre cladding 102 is destroyed, thus luminous power is guided in the higher index-coupling medium layer 103 of refractive index, and is imported into further in guiding optical waveguide 104.Whole process, in fibre cladding 102, residual light is exported, and fiber core 101 conduction mode is not damaged.
In the present embodiment, when the covering 102 of optical fiber is single covering, can directly at the coated index-coupling medium layer 103 of the outside surface of single covering and guiding optical waveguide 104.When the covering 102 of optical fiber is for double clad (being made up of inner cladding and surrounding layer), also can directly at the coated index-coupling medium layer 103 of the outside surface of surrounding layer and guiding optical waveguide 104.Certainly, one section of surrounding layer can also be removed, expose inner cladding, then at the coated index-coupling medium layer 103 of the outside surface of inner cladding exposed portion and guiding optical waveguide 104.
Further, for single covering or doubly clad optical fiber, coat (not shown) can also be provided with outside covering 102, still can at the outside surface of coat successively coated index-coupling medium layer 103 and guiding optical waveguide 104.Wherein, the refractive index of coat 105 is less than the refractive index of index-coupling medium layer 103.In addition, also of coat section can be removed, and outside surface coated index-coupling medium layer 103 and the guiding optical waveguide 104 successively in the exposed portion of covering 102.For the doubly clad optical fiber being provided with coat, by one section of removal of coat and surrounding layer, inner cladding can also be exposed, then index-coupling medium layer 103 and guiding optical waveguide 104 is set at the outside surface of the exposed portion of inner cladding.
In a word, for single covering, double clad and with single covering of coat and doubly clad optical fiber, above-mentioned index matching scheme can be adopted, the residual light in covering or coat is derived and then avoids fibre cladding or coat heating.
Optical fiber in the present embodiment can be large-power optical fiber pump combiner or signal bundling device input or output optical fiber, or the Active Optical Fiber of fiber laser or fiber amplifier and the docking point of passive fiber can also be the output terminal optical fiber of fiber laser or fiber amplifier.
The fibre cladding residual light energy stripper that the utility model provides can be adopted and make with the following method:
As needed the luminous energy in filtering fibre cladding, adopt following proposal:
(1), at certain position of optical fiber part coat is peelled off, by clean clean for the glass-clad exposed.The length of the coat divested is according to the optical filtering degree setting that will reach.
(2), will expose and clean clean covering by index-coupling medium and guiding optical waveguide close contact, the making of fibre cladding residual light energy stripper can be completed.
If need the luminous energy in filtering optical fiber coating, adopt following proposal:
(1), at certain site anteseptic coat of optical fiber.
(2), by clean clean coat by index-coupling medium and guiding optical waveguide close contact, fibre cladding residual light energy stripper volume can be completed and make.Be coated in the length of the index-coupling medium of coat according to the optical filtering degree setting that will reach.
embodiment two:
With further reference to Fig. 3, the utility model provides a kind of optical-fiber bundling device further, the output optical fibre 302 comprising many input optical fibres and be coupled with many input optical fibres 301, input optical fibre 301 and output optical fibre 302 include fibre core (not shown) and covering 311, the index-coupling medium layer 312 being coated with finite length of covering 311, guiding optical waveguide 313 is coated with at the outside surface of index-coupling medium layer 312, the refractive index of index-coupling medium layer 312 is greater than the refractive index of covering 311, and is less than the refractive index of guiding optical waveguide 313.
In the present embodiment, input optical fibre 301 and output optical fibre 302 can adopt single covering or doubly clad optical fiber, or arrange coat outside covering.Can use above-mentioned index matching scheme to the inner cladding of input optical fibre 301 and output optical fibre 302, surrounding layer or coat, the embodiment as above-mentioned fibre cladding residual light energy stripper is identical, and the present embodiment repeats no more.
With further reference to Fig. 3, many the outside coated guiding optical waveguide 313 of input optical fibre can be structure as a whole, it has several through holes passed for input optical fibre 301, input optical fibre 301 is man-to-man through through hole, and being fixed in guiding optical waveguide 313 by index-coupling medium layer 312, this structure is convenient to assembling and good stability.
The method for making of this optical-fiber bundling device with reference to the method for making of above-mentioned same fibre cladding residual light energy stripper, can repeat no more herein.The applicable wavelengths of above-mentioned optical-fiber bundling device and fibre cladding residual light energy stripper is 700nm ~ 2500nm.
Technique effect of the present utility model is further illustrated below by way of specific experiment data:
Optical-fiber bundling device shown in Fig. 3 is 7 × 1 fiber pump combiners, input optical fibre 301 and output optical fibre 302 are single cladded-fiber, the core diameter of input optical fibre 301 is 105 μm, cladding thickness is 125 μm, numerical aperture 0.15, the core diameter of output optical fibre 302 is 200 μm, cladding thickness is 220 μm, numerical aperture 0.22, average pump coupling efficiency about 95%.Respectively unnecessary cladding light in 220 μm of glass-clad of 125 of input optical fibre 301 μm of glass-clad and output optical fibre 302 derived by index-coupling medium layer 312 and import in corresponding guiding optical waveguide 313.In this example, test environment temperature 28 DEG C, bundling device 7 input end list footnotes enter 25W, and after altogether injecting 175W pump light, input optical fibre temperature is within 30 DEG C, and output optical fibre temperature is at about 40 DEG C.
As another example, index matching scheme is used to the inner cladding of doubly clad optical fiber, derive the pump light of inner cladding, doubly clad optical fiber core diameter is 25 μm, inner cladding thickness is 250 μm, pump light is the multiple die semiconductor laser of 915nm, in pumping completely injection situation, after doubly clad optical fiber pump light filtering device, in inner cladding, pumping light power loss reaches more than 20dB (pump light of 99% is exported), inject pumping light power in Non-water-cooled situation and can reach more than 50W, can be used for the fiber laser residue filtering of light or the filtering of external reflection light.
The utility model by arranging guiding optical waveguide outside the covering or coat of optical fiber, and with index-coupling medium layer for transition material, the refractive index of guiding optical waveguide is made to be greater than the refractive index of index-coupling medium layer, and make the refractive index of index-coupling medium layer be greater than the refractive index of covering or coat, thus the residual light entering fibre cladding is imported in guiding optical waveguide, thus residual light can not be generated heat around fibre cladding or its, and there is the advantages such as insertion loss is low, package dimension is little, be suitable in large-power optical fiber device.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a fibre cladding residual light energy stripper, it is characterized in that, comprise fibre core, covering, coat, be coated on the index-coupling medium layer of the finite length outside described covering and the guiding optical waveguide with described index-coupling medium layer exterior surface, the refractive index of described index-coupling medium layer is greater than the refractive index of described covering or coat, and is less than the refractive index of described guiding optical waveguide.
2. fibre cladding residual light energy stripper as claimed in claim 1, it is characterized in that, described covering is single covering.
3. fibre cladding residual light energy stripper as claimed in claim 1, it is characterized in that, described covering is double clad, described double clad is made up of inner cladding and surrounding layer, one section of described surrounding layer is removed and exposes inner cladding, and the outside surface in the exposed portion of inner cladding is coated with described index-coupling medium layer and guiding optical waveguide successively.
4. fibre cladding residual light energy stripper as claimed in claim 1, it is characterized in that, coat is provided with at the outside surface of described covering, described index-coupling medium layer is coated on the outside surface of described coat, and the refractive index of described index-coupling medium layer is greater than the refractive index of described coat.
5. fibre cladding residual light energy stripper as claimed in claim 1, it is characterized in that, coat is provided with at the outside surface of described covering, one section of described clad is removed and exposes covering, and the outside surface in the exposed portion of covering is coated with described index-coupling medium layer and guiding optical waveguide successively.
6. an optical-fiber bundling device, it is characterized in that, the output optical fibre comprising many input optical fibres and be coupled with described many input optical fibres, described input optical fibre and output optical fibre include fibre core and covering, the index-coupling medium layer being coated with finite length of described covering and the guiding optical waveguide with described index-coupling medium layer exterior surface, the refractive index of described index-coupling medium layer is greater than the refractive index of described covering, and is less than the refractive index of described guiding optical waveguide.
7. optical-fiber bundling device as claimed in claim 6, it is characterized in that, the outside coated guiding optical waveguide of described many input optical fibres is structure as a whole and has the through hole that the described input optical fibre of some confessions passes, described input optical fibre is man-to-man through described through hole, and is fixed in described guiding optical waveguide by described index-coupling medium layer.
8. optical-fiber bundling device as claimed in claim 6, it is characterized in that, be coated with coat at the outside surface of described covering, described index-coupling medium layer is coated on the outside surface of described coat, and the refractive index of described index-coupling medium layer is greater than the refractive index of described coat.
9. optical-fiber bundling device as claimed in claim 6, it is characterized in that, be coated with coat at the outside surface of described covering, one section of described coat is removed and exposes covering, and the outside surface in the exposed portion of described covering is coated with described index-coupling medium layer and guiding optical waveguide successively.
10. optical-fiber bundling device as claimed in claim 6, it is characterized in that, described covering is single covering or double clad;
Described double clad is made up of inner cladding and surrounding layer, and one section of described surrounding layer is removed and exposes inner cladding, and the outside surface in the exposed portion of described inner cladding is coated with described index-coupling medium layer and guiding optical waveguide successively.
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| CN201420543547.1U CN204116642U (en) | 2014-09-19 | 2014-09-19 | A kind of fibre cladding residual light energy stripper and optical-fiber bundling device |
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| CN201420543547.1U CN204116642U (en) | 2014-09-19 | 2014-09-19 | A kind of fibre cladding residual light energy stripper and optical-fiber bundling device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105158852A (en) * | 2015-07-30 | 2015-12-16 | 深圳市欧凌镭射科技有限公司 | Optical fiber combiner and optical fiber laser |
| CN105449499A (en) * | 2015-12-11 | 2016-03-30 | 中电科天之星激光技术（上海）有限公司 | Filtering method for optical fiber cladding layer light by utilizing waveguide capillary |
| CN105572802A (en) * | 2016-03-03 | 2016-05-11 | 北京航天控制仪器研究所 | Fiber welding point processing method |
| CN107134706A (en) * | 2016-02-29 | 2017-09-05 | 深圳朗光科技有限公司 | A kind of fibre cladding residual light filters out structure and optical fiber laser |
| CN107272124A (en) * | 2017-07-19 | 2017-10-20 | 深圳市创鑫激光股份有限公司 | The cladding light stripper and preparation method of a kind of high-power laser optical fiber |
| CN107861193A (en) * | 2017-11-07 | 2018-03-30 | 大族激光科技产业集团股份有限公司 | Optical-fiber bundling device and preparation method thereof, abatement optical fiber return reflective method and semiconductor laser |
| CN107907938A (en) * | 2017-12-22 | 2018-04-13 | 北京凯普林光电科技股份有限公司 | A kind of fiber coupling input end structure |
| CN107918172A (en) * | 2017-11-07 | 2018-04-17 | 大族激光科技产业集团股份有限公司 | Optical-fiber bundling device and preparation method thereof, abatement optical fiber return reflective method and semiconductor laser |
| TWI667853B (en) * | 2017-12-26 | 2019-08-01 | 國家中山科學研究院 | High power fiber laser beam |
| WO2019189317A1 (en) * | 2018-03-29 | 2019-10-03 | 株式会社フジクラ | Photodetector device and laser system |
| CN112379481A (en) * | 2020-11-17 | 2021-02-19 | 上海飞博激光科技有限公司 | Preparation method of optical fiber beam combiner for preventing cladding light from returning |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105158852A (en) * | 2015-07-30 | 2015-12-16 | 深圳市欧凌镭射科技有限公司 | Optical fiber combiner and optical fiber laser |
| CN105449499A (en) * | 2015-12-11 | 2016-03-30 | 中电科天之星激光技术（上海）有限公司 | Filtering method for optical fiber cladding layer light by utilizing waveguide capillary |
| CN105449499B (en) * | 2015-12-11 | 2019-05-17 | 中电科天之星激光技术（上海）有限公司 | A kind of fibre cladding light filtering method using waveguide capillary |
| CN107134706A (en) * | 2016-02-29 | 2017-09-05 | 深圳朗光科技有限公司 | A kind of fibre cladding residual light filters out structure and optical fiber laser |
| CN105572802A (en) * | 2016-03-03 | 2016-05-11 | 北京航天控制仪器研究所 | Fiber welding point processing method |
| CN107272124A (en) * | 2017-07-19 | 2017-10-20 | 深圳市创鑫激光股份有限公司 | The cladding light stripper and preparation method of a kind of high-power laser optical fiber |
| CN107861193A (en) * | 2017-11-07 | 2018-03-30 | 大族激光科技产业集团股份有限公司 | Optical-fiber bundling device and preparation method thereof, abatement optical fiber return reflective method and semiconductor laser |
| CN107918172A (en) * | 2017-11-07 | 2018-04-17 | 大族激光科技产业集团股份有限公司 | Optical-fiber bundling device and preparation method thereof, abatement optical fiber return reflective method and semiconductor laser |
| CN107907938A (en) * | 2017-12-22 | 2018-04-13 | 北京凯普林光电科技股份有限公司 | A kind of fiber coupling input end structure |
| TWI667853B (en) * | 2017-12-26 | 2019-08-01 | 國家中山科學研究院 | High power fiber laser beam |
| WO2019189317A1 (en) * | 2018-03-29 | 2019-10-03 | 株式会社フジクラ | Photodetector device and laser system |
| CN112379481A (en) * | 2020-11-17 | 2021-02-19 | 上海飞博激光科技有限公司 | Preparation method of optical fiber beam combiner for preventing cladding light from returning |
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