CN100470282C - Turnning optical fibre method Fabry-perot filter - Google Patents
Turnning optical fibre method Fabry-perot filter Download PDFInfo
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- CN100470282C CN100470282C CNB2007101778354A CN200710177835A CN100470282C CN 100470282 C CN100470282 C CN 100470282C CN B2007101778354 A CNB2007101778354 A CN B2007101778354A CN 200710177835 A CN200710177835 A CN 200710177835A CN 100470282 C CN100470282 C CN 100470282C
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims description 32
- 239000000835 fiber Substances 0.000 claims abstract description 47
- 239000000919 ceramic Substances 0.000 claims abstract description 8
- 238000007747 plating Methods 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000003595 spectral effect Effects 0.000 description 13
- 230000005540 biological transmission Effects 0.000 description 11
- 230000003287 optical effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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Abstract
The present invention discloses a tunable optical fiber Fabry-Pero filter. The object is to provide the tunable optical fiber Fabry-Pero filter with a Fabry cavity optical fiber waveguide, easy manufacturing and low cost. The present invention comprises a core inset (1), the optical fiber waveguide (2), a high reflecting coating (3), an antireflection coating (4), an optical fiber (5), a support (6), a piezoelectric ceramics (7) and a fiber collimator (8); the optical fiber waveguide is fixed in one inner hole of the core insert. One end surface is placed in the inner hole of the core insert and the other end surface is placed on the same flat with the core insert end surface. The inner hole of the core insert which fixes the optical fiber waveguide is also inserted by the optical fiber. The optical fiber and the optical fiber waveguide are automatically aligned through the inner hole of the core insert. One of the two adjacent end surfaces of the optical fiber and the optical fiber waveguide is coated with the high reflecting coating. The end surface of the core insert or the other end surface of the core insert with optical fiber is coated with the high reflecting coating, so the optical fiber Fabry-Pero filter is formed.
Description
Technical field
The present invention relates to the optical device that uses in a kind of Fiber Optical Communication System and the optical fiber sensing system, particularly a kind of Turnning optical fibre method Fabry-perot filter.
Background technology
Turnning optical fibre method Fabry-perot (Fabry-Perot, FP, the method amber) wave filter is a kind of important optical filter, be the Primary Component of modern optical fiber telecommunications system and optical fiber sensing system, have purposes widely, monitor as the optical property in the optical communication, the optical noise filtering, the squelch of image intensifer, channel selecting in the wavelength-division multiplex system and locking, and the wavelength tuning of LASER Light Source; In optical fiber sensing system, tunable fiber method amber wave filter is used to the scanning of wavelength, is the Primary Component of Wavelength demodulation and spectroscopic analysis system.
The Fabry-perot optical fiber wave filter is coated with the optical fiber of highly reflecting films by end face one to one, and the Fa-Po cavities that two highly reflecting films form relatively constitute.The transport property of Fabry-perot optical fiber wave filter is an Airy function, and when Fa-Po cavity length was the integral multiple of half-wavelength, corresponding wavelength satisfied the condition of resonance of Fa-Po cavity, had maximum transmissivity; The parameter of tunable fiber method amber wave filter, long as medium refraction index in the chamber or chamber, corresponding resonance wavelength changes, thereby has realized the tuning of transmission peak wavelength.The performance of Fabry-perot optical fiber wave filter can use the free spectral range scope (free spectral range, FSR), fineness (finesse, F), bandwidth (full width half maximum, FWHM), and describe by peak transmission (or insert loss).Wherein the free spectral range scope is the difference of adjacent peak value frequencies of transmission (or wavelength), FSR=c/2nl
c, wherein c is the light velocity in the vacuum, n is the medium refraction index of Fa-Po cavity, l
cFor Fa-Po cavity long; Fineness is the ratio of free spectral range and bandwidth.
Obtain high fineness and peak transmission, must the strict cavity loss of controlling the Fabry-perot optical fiber wave filter.These losses comprise between the optical fiber radially, the loss that causes of angular deflection, the undesirable loss that causes of fiber end face, and light after the optical fiber outgoing the free space of Fa-Po cavity the diffraction loss during transmission.Wherein, diffraction loss is the most important loss that influences performance of filter.Diffraction loss with light after the optical fiber outgoing free space the increase of transmission range increase, so, obtain desirable fineness and peak transmission, must the control Fa-Po cavity in the length of free space.Thus, J.Stone and L.W.Stulz have proposed the Fabry-perot optical fiber filter construction (J.Stone of three kinds of different structures, L.W.Stulz.PigtailedHigh-Finesse Tunable Fiber Fabry-Perot Interferometers withLarge, Medium and Small Free Spectral Ranges.ElectronicsLetters, 1987 (16): 781-782), as shown in Figure 5, be applicable to different free spectral range scopes respectively.1 type structure wherein: two end faces plating highly reflecting films at one section optical fiber form the Fabry-perot optical fiber wave filters, and this structured optical fiber length is greater than 1～2cm, and corresponding free spectral range is less than 10～5GHz; 2 type structures: at an end face coating of a pair of optical fiber, two plated film end faces constitute the Fabry-perot optical fiber wave filter relatively, adopt this structure respectively, in order to control diffraction loss, Fa-Po cavity length is limited in the 10 μ m, and corresponding free spectral range is greater than 10000GHz, and peak transmission is also undesirable simultaneously; 3 type structures: in Fa-Po cavity, introduce one section fibre-optic waveguide, light in the Fa-Po cavity is limited in the optical fiber transmits, this structure can cover the free spectral range scope that great majority need, and the length of fibre-optic waveguide can arrive 1mm even littler, and corresponding free spectral range scope can be greater than 100GHz.These three kinds of structures have been established the basis of Fabry-perot optical fiber wave filter.
Modern optical communication systems generally requires the free spectral range scope of tunable optical filter at least greater than one in S, C, the L-band, i.e. FSR〉50nm; Also require simultaneously the free spectral range must be greater than the spectral range of used light source in optical fiber sensing system, the ASE light source to commonly used generally requires wave filter FSR〉80nm; Therefore, require the fibre-optic waveguide length in the Fa-Po cavity will make very difficulty of so short fibre-optic waveguide less than～10 μ m.
Calvin C.Miller is according to 3 type structures, a kind of method of making the waveguide of Fa-Po cavity inner fiber has been proposed, invented Fabry-perot optical fiber wave filter (patent US5062684, US5208886) with the waveguide of Fa-Po cavity inner fiber, simultaneously successful realization commercialization (Micron Optics company).The structure that is adopted as shown in Figure 6, method for making is as follows: select two lock pins (or kapillary) for use, optical fiber is fixed in the endoporus of lock pin, grind an end face of lock pin respectively; The highly reflecting films of the face off of lock pin plating therein, the region limits of plated film is at the lock pin core, and remaining not, coating film area is used for bonding; The face off of two lock pins is staggered relatively, and highly reflecting films place between two lock pins, and monitoring optical power, adjustment lock pin make two optical fiber in the lock pin aligned with each other, by ultra-violet curing glue two lock pins are bonded together; Grind one of them lock pin to preset length and form new insertion core end face, thereby be made into a lock pin group.Adopt two such lock pin groups, make they new grinding fiber end face toward each other, the optical fiber between two highly reflecting films is the waveguide of Fa-Po cavity inner fiber, thereby has limited diffraction loss, is made into the Fabry-perot optical fiber wave filter of low-loss, high-fineness.
Though the domestic utility model scheme (CN2670959Y that also proposed, CN2593217Y), but all be to adopt 2 type structures, end face at a pair of bare fibre, the fine lock pin of band plates highly reflecting films respectively, aim at mutually then and form the Fabry-perot optical fiber wave filter, these methods do not solve the diffraction loss problem, can not reach good performance.
Summary of the invention
The objective of the invention is method complexity at the waveguide of existing making Fa-Po cavity inner fiber, to equipment and the very high problem of technological requirement, utilize ripe fiber optic telecommunications equipment, equipment, material and job operation, the tunable fiber method amber wave filter that provide a kind of and have the waveguide of Fa-Po cavity inner fiber, is easy to make, cost is low.
Tunable fiber method amber wave filter of the present invention is achieved by following technical proposals.Tunable fiber method amber wave filter of the present invention comprises lock pin, fibre-optic waveguide, highly reflecting films, anti-reflection film, optical fiber, bearing, piezoelectric ceramics, optical fiber collimator, fibre-optic waveguide is fixed in the endoporus of a lock pin, an end face is arranged in the lock pin endoporus, another end face and insertion core end face are positioned at same plane, inserted an optical fiber in the lock pin endoporus of fixed fiber waveguide simultaneously, this optical fiber and fibre-optic waveguide are aimed at automatically by the lock pin endoporus; One in the adjacent face of optical fiber and fibre-optic waveguide is coated with highly reflecting films, the end face of the lock pin of fixed fiber waveguide, and perhaps another is with the end face of fine lock pin, and the plating highly reflecting films form fiber Fabry-Perot filters.
Described fibre-optic waveguide is fixed in the lock pin endoporus after for a end surface grinding that will bare fibre, plated film, and the plated film end face is arranged in the lock pin endoporus, and the other end extends insertion core end face, grinds the bare fibre part that remains in behind the insertion core end face in the lock pin endoporus.
Described tunable fiber method amber wave filter can be the end face plating highly reflecting films that are arranged in the lock pin endoporus of fibre-optic waveguide, be fixed in the endoporus of lock pin with the optical fiber of fibre-optic waveguide with lock pin, another is fixed with the end face plating highly reflecting films of the lock pin of optical fiber, two lock pins are aimed at and are formed the Fabry-perot optical fiber wave filter, realize wavelength tuning by the distance that changes between lock pin.
Described tunable fiber method amber wave filter can be the common end face plating highly reflecting films of fibre-optic waveguide and lock pin, another end face plating anti-reflection film, with the optical fiber of fibre-optic waveguide with lock pin, its end face plating highly reflecting films, form the Fabry-perot optical fiber wave filter, this optical fiber moves axially the realization wavelength tuning along the lock pin endoporus.
Beneficial effect of the present invention:
The waveguide of Fa-Po cavity inner fiber is fixed in the endoporus of lock pin, has solved the clamping problem of short fiber waveguide; By grinding insertion core end face the length of fibre-optic waveguide is reduced, the monitoring process of lapping can obtain the fibre-optic waveguide length of needs.
Utilize lock pin endoporus and optical-fibre precise to cooperate, realized that fibre-optic waveguide aims at the automatic of optical fiber.
Adopt ripe device, equipment, material and manufacturing process in the optical fiber communication, easy to process, cost is low.
Description of drawings
Fig. 1 is a kind of tunable fiber method amber Filter Structures synoptic diagram of the present invention;
Fig. 2 is the method for making synoptic diagram of Fa-Po cavity inner fiber waveguide;
Fig. 3 is a kind of tunable fiber method amber Filter Structures synoptic diagram of the present invention;
Fig. 4 is a kind of tunable fiber method amber Filter Structures synoptic diagram of the present invention;
Fig. 5 is three kinds of basic structure synoptic diagram of Fabry-perot optical fiber wave filter;
Fig. 6 is existing tunable fiber method amber Filter Structures synoptic diagram.
Among the figure: 1,1 '-lock pin 2-fibre-optic waveguide 3,3 '-highly reflecting films 4-anti-reflection film 5,5 ', 5 "-optical fiber 6-bearing 7-piezoelectric ceramics 8-optical fiber collimators
Specific embodiments
The invention will be further described below in conjunction with drawings and Examples.
Embodiment 1
First kind of structure of tunable fiber method amber wave filter of the present invention as shown in Figure 1.Tunable fiber method amber wave filter comprise two lock pins 1 and 1 ', the long piezoelectric ceramics 7 of the fixedly bearing 6 of lock pin, and tuning Fa-Po cavity; Having fixed optical fiber 5 and fibre-optic waveguide 2 by glue in the endoporus of lock pin 1, is highly reflecting films 3 between optical fiber 5 and fibre-optic waveguide 2, and fibre-optic waveguide 2 is between the end face of highly reflecting films 3 and lock pin 1, and the end face of lock pin 1 is coated with anti-reflection film 4; Lock pin 1 ' endoporus in by glue fixed optical fiber 5 ', lock pin 1 ' end face plating highly reflecting films 3 '.Lock pin 1,1 ' be fixed on the bearing 6 after minute adjustment is aimed at forms the Fabry-perot optical fiber wave filter, and it is long to change Fa-Po cavity by piezoelectric ceramics 7, just can realize the tuning of transmission peak wavelength.
The method for making of Fa-Po cavity inner fiber waveguide 2 as shown in Figure 2, " be fixed in the endoporus of lock pin 1, grind the end face of lock pin 1, " part that remains in the lock pin 1 is Fa-Po cavity inner fiber waveguide 2 to optical fiber 5 with optical fiber 5.
Embodiment 2
Second kind of structure of tunable fiber method amber wave filter of the present invention as shown in Figure 3.Tunable fiber method amber wave filter comprises lock pin 1, the bearing 6 of fixed fiber method amber wave filter, the long piezoelectric ceramics 7 of tuning Fa-Po cavity, and the optical fiber collimator 8 that receives Fabry-perot optical fiber filter transmission light; Fixed fibre-optic waveguide 2 by glue in the endoporus of lock pin 1, an end face of fibre-optic waveguide 2 is arranged in the lock pin endoporus, is coated with anti-reflection film 4 simultaneously, and another end face is for grinding the end face that lock pin 1 forms, be coated with highly reflecting films 3 '; Optical fiber 5 is from the endoporus of the afterbody insertion lock pin 1 of lock pin 1, and end face is coated with highly reflecting films 3.Optical fiber 5 can move along the axis of the endoporus of lock pin 1, and changing the positions of optical fiber 5 in lock pin 1 endoporus by piezoelectric ceramics 7, can to change Fa-Po cavity long, thereby the realization transmission peak wavelength is tuning.
Second kind of structure of tunable fiber method amber wave filter of the present invention also can adopt structure as shown in Figure 4, utilizes the optical fiber collimator 8 among lock pin 1 ' replacement Fig. 3, receives the transmitted light of Fabry-perot optical fiber wave filter.
Claims (4)
1, a kind of Turnning optical fibre method Fabry-perot filter, comprise lock pin, fibre-optic waveguide, highly reflecting films, anti-reflection film, optical fiber, bearing, and piezoelectric ceramics, it is characterized in that: fibre-optic waveguide (2) is fixed in the endoporus of a lock pin (1), an end face is arranged in the endoporus of lock pin (1), another end face and lock pin (1) end face is positioned at same plane, inserted an optical fiber (5) in the lock pin endoporus of fixed fiber waveguide (2) simultaneously, this optical fiber (5) and fibre-optic waveguide (2) are aimed at automatically by the lock pin endoporus; One in the adjacent face of optical fiber (5) and fibre-optic waveguide (2) is coated with highly reflecting films (3), the end face of the lock pin (1) of fixed fiber waveguide (2), perhaps be fixed with the end face of the lock pin (1 ') of optical fiber (5 ') in another endoporus, plating highly reflecting films (3 ') form fiber Fabry-Perot filters.
2, Turnning optical fibre method Fabry-perot filter according to claim 1, it is characterized in that: bare fibre is fixed in the endoporus of lock pin (1), make an end face of bare fibre be arranged in the endoporus of lock pin (1), the other end extends lock pin (1) end face, grind lock pin (1) end face then, grind the bare fibre that remains in lock pin (1) endoporus after finishing and partly be fibre-optic waveguide (2).
3, Turnning optical fibre method Fabry-perot filter according to claim 1 and 2, it is characterized in that: the end face plating highly reflecting films (3) that are arranged in lock pin (1) endoporus of fibre-optic waveguide (2), be fixed in the endoporus of lock pin (1) with the optical fiber (5) of fibre-optic waveguide (2) with lock pin, another is fixed with the end face plating highly reflecting films (3 ') of the lock pin (1 ') of optical fiber (5 '), two lock pins are aimed at and are formed fiber Fabry-Perot filters, realize wavelength tuning by the distance that changes between lock pin.
4, Turnning optical fibre method Fabry-perot filter according to claim 1 and 2, it is characterized in that: fibre-optic waveguide (2) plates highly reflecting films (3 ') with the common end face of lock pin (1), another end face plating anti-reflection film (4), with the optical fiber (5) of fibre-optic waveguide (2) with lock pin, its end face plating highly reflecting films (3), form fiber Fabry-Perot filters, optical fiber (5) moves axially the realization wavelength tuning along lock pin (1) endoporus.
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| CNB2007101778354A CN100470282C (en) | 2007-11-21 | 2007-11-21 | Turnning optical fibre method Fabry-perot filter |
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| CNB2007101778354A CN100470282C (en) | 2007-11-21 | 2007-11-21 | Turnning optical fibre method Fabry-perot filter |
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| CN100470282C true CN100470282C (en) | 2009-03-18 |
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Cited By (1)
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