CN102608711A - Up-and-down voice channel evice based on blazed fiber brag gratings - Google Patents
Up-and-down voice channel evice based on blazed fiber brag gratings Download PDFInfo
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Abstract
The invention discloses an up-and-down voice channel device based on blazed fiber brag gratings, relating to an optical up-and-down voice channel device which is applicable to the fields of optical fiber communication, wavelength division multiplexing and optical devices. According to the invention, the problems of the existing optical up-and-down voice channel device, such as complex structure, big volume, high manufacturing difficulty, high cost, large insertion loss and poor isolation degree of different wavelength channels, are solved. The up-and-down voice channel device comprises a photosensitive fiber (9), first to N-th up voice channel photosensitive fibers (81, 82, 83,..., 8N), first to N-th down voice channel photosensitive fibers (71, 72, 73,..., 7N), first to N-th up voice channel blazed fiber brag gratings (61, 62, 63,..., 6N) respectively etched on the first to the N-th up voice channel photosensitive fibers (81, 82, 83,..., 8N) through ultraviolet light and first to N-th down voice channel blazed fiber brag gratings (51, 52, 53,..., 5N) sequentially etched on the first to the N-th upward voice channel photosensitive fibers (71, 72, 73,..., 7N); a first port (1) is a down voice channel input port; and a second port (2) is an up voice channel output port.
Description
Technical field
The present invention relates to a kind of Add/drop Voice Channel device, be applicable to optical fiber communication, wavelength-division multiplex, optical device field.
Background technology
Be that information capacity is increasing in the backbone network of main means with optical communication, the performance of all kinds of relative photo devices also promotes greatly, and cost is in further reduction.The introducing of wavelength-division multiplex technique has the lifting of matter to the optical communication system capacity; But also there is certain difficulty in the processing to the multiplexed signals of multi-wavelength simultaneously; The problem that at first need solve is exactly that the light signal of required wavelength is separated from multiplexed signals; Through certain processing, or directly other identical wavelength light signal is loaded in the light path of original multiplexed signals.The completion of this work need be used the Add/drop Voice Channel device, also is called as add-drop multiplexer, and its principle of work just is based on the wavelength division multiplexer that separates the different wave length signal.
Continuous advancement in technology must cause the lifting of device performance, and cost descends, and present wavelength division multiplexer mainly is divided into Filter Type, diffraction grating type, coupling type and arrayed waveguide grating type.
Based on the wavelength division multiplexer of wave filter, major technique is the making of wave filter, is example with the dielectric film, and thin layers that need multilayer refractive index height is alternate is pressed into wavelength dielectric film selectively together.The insertion loss of this wave filter is very low, and the flatness that wavelength is selected is also better, but the manufacturing technology difficulty of film is big, and when number of wavelengths increased, the performance of filtering can seriously descend, and only is applicable to the occasion that wavelength is less.The used dielectric film that just is based on the wavelength selection among the corresponding one Chinese patent application 200410009560.X, 03157491.2,201020648154.9,02147781.7,01244701.3,201020689830.7,02105865.2.
Advantage based on the wavelength division multiplexer of diffraction grating is that wavelength selectivity is good, and the interval of adjacent wavelength is very little, has promoted the closeness of wavelength-division multiplex.But the manufacture difficulty of diffraction grating wherein is big, and cost is high, and the adjustment difficulty of lens and diffraction grating angle is big, and the entire device volume is also very big, has difficulties with the coupling of optical fiber, is unfavorable for integrated.The Primary Component of using among corresponding one Chinese patent application 02137411.2,02265236.1,02137326.4, the 02264878.X, 02112346.2,02260525.8,02159350.7,03150925.8 is diffraction grating.
Based on the wavelength division multiplexer of coupling mechanism, most separation and integration of adopting the method realization wavelength of fused biconical taper are because the fiber coupler technology is quite ripe; The excellent in stability of the wavelength division multiplexer of in this way making; Broader bandwidth, the maturation of technology makes its manufacturing process simple, but that its maximum problem is for the insertion loss of closing wave process is excessive; This problem is the structures shape of coupling mechanism, can't change.Corresponding one Chinese patent application 200920126810.6 used structures are the wavelength division multiplexer of coupling mechanism mode.
Wavelength division multiplexer based on array waveguide grating is the plane waveguiding device that is the basis with the light integrated technology, and main manufacturing technology is on silica-based, to deposit layer of silicon dioxide, generates needed pattern with photoetching technique.This technology very helps multiband, multichannel multiplexer, and volume is less, but too responsive to temperature, and the flatness in the passband is poor.Corresponding one Chinese patent application 201110148539.8,201110127256.5,03143432.0,99119420.9,200510050515.3,03102310.X, 03125303.2,200720113050.6,00119305.8,200480030218.6,00136297.6,201110353298.0 used structures are array waveguide grating.
To form in the structure the intrinsic problem of wavelength division multiplexer separately consistent with it for the problem that is faced based on the Add/drop Voice Channel device of above four types of wavelength division multiplexers, and be difficult to realize through the difference of taking to make up the improvement of corresponding shortcoming.Single maximum based on the wavelength division multiplexer of array waveguide grating, it is more flexible that one of reason is that its structure is compared other several types of wavelength division multiplexers from mentioned patent quantity, and a little change of structure just can produce a kind of structure of novelty.Be exactly as a kind of newer structure type in addition, also more cause researcher's interest, this has also just explained the problem that the current array waveguide optical grating exists, and the method that solves variation more.
Comparatively speaking; Based on the wavelength division multiplexer list of coupler structure from patent quantity; Far fewer than other three types, one of reason is the simple in structure of coupling mechanism, and there is certain difficulty in the proposition of substantial innovative approach; And the technology maturation of coupling mechanism, the innovative point deficiency also becomes a factor of its difficult everybody of attraction sight.Wavelength division multiplexer based on coupling mechanism also is unique structure that can realize full fiberize in four kinds of primary waves division multiplexer types.Because the inborn broadband character of coupling mechanism; Want to realize that the separation of narrowband optical signal also is difficult to realize at present, want therefore to realize that the wavelength division multiplexer of full fiberize also need combine the frequency-selecting device of other type to assist the separation that realizes controlled any wavelength signals.
Fiber grating has been brought into play very enormous function as a kind of good filtering device in the optical information field.The separation of a plurality of wavelength generally needs the auxiliary of device such as circulator, realize that also there is certain difficulty in any wavelength separated of full fiberize.One Chinese patent application 201110053041.3 proposes a kind of wavelength division multiplex device and job operation thereof based on the blazed fiber bragg grating of warbling; It is 90 ° and directly be coupled in the multi-channel optical fibre that configures in advance with the angles that guarantee incident ray and reflection ray that blazed fiber bragg grating angle wherein is defined as 45 °; This wavelength division multiplexer structure can realize the separation of any wavelength and close bundle; Controllability is strong, but higher for the requirement on machining accuracy of device, and the placement angle of optical fiber also must guarantee precision; And also need be less than or equal to the cross-sectional sizes of output optical fibre corresponding to the index modulation length of different-waveband light signal owing to glitter in the chirped fiber grating; This requirement makes that the grating index modulation degree of depth must be very high, and there is sizable difficulty in the making of this grating in the present circumstance, even can't realize; In case grating pair answers the modulation length of wave band long; Just can't effectively light signal be coupled in the output optical fibre, lose a large amount of luminous energies, increase the insertion loss of wavelength division multiplexer greatly.If can further introduce loss and adopt micro lens that light signal is focused on, and lenticular manufacture difficulty is also higher, and the adjustment of light path is also quite difficult, has increased the instability factor of total system.Similarly one Chinese patent application 01109388.9 is mentioned a kind of blazed grating isolator based on polymkeric substance; Wherein partial content can be used as the wavelength division multiplexer use, is matrix owing to adopt polymkeric substance, and its insertion loss and welding difficulty are all very big when being connected with optical fiber link; And at outer two coverings that are divided into two of making of the cylindrical waveguide of not enough millimeter magnitude; And refractive index is different, and difficulty is big, and the accuracy requirement of making is too high and be difficult to realize; Refractive index to the grating in fuse, the fuse, first covering, second covering in manufacturing process all has requirement, and the difficulty of realization is big.
People such as Orlov Sergei S. are published in the paper 1997 on the Opt.Lett.; 22 (10): 688-690. mentions that the Bragg fiber grating is inscribed in a kind of coupled zone at coupling mechanism and Add/drop Voice Channel device that realize; Similarly structure also has embodiment----Acta Physica Sinica in the people's such as researchist Dong Xiaowei of China paper; 2006; 55 (9): the Add/drop Voice Channel device of this class formation of 4739-4743. all need pass through methods such as fused biconical taper, grinding and form the coupled zone, inscribes fiber grating at the correct position of coupled zone, and the length of the length of fiber grating, coupled zone, fiber grating two ends all needs accurately control; To realize the separation of different wave length signal, its manufacture difficulty is very big.One Chinese patent application 200610171583.X also mentions similar structures, adopts twin-core fiber to replace coupler structure, faces the selection of coupled zone length equally, and the difficulty of making is big.
Though relying on the frequency-selecting effect of common Bragg fiber grating fully can separate wavelength optical signals; But needed auxiliary part cost is very high usually; Such as circulator, and adopt the structure of blazed fiber bragg grating can address this problem to a great extent, need not the support of other member or only need other low-cost member seldom; One Chinese patent application: the structure of having used blazed grating among the 01251876.X; Can make between Add/drop Voice Channel port and the key waveguide only to be connected and can light signal to be uploaded and downloaded through waveguide, the problem that wherein faces also clearly, though only connect through waveguide; But the method for attachment of waveguide difficulty on making is bigger; And because the cross connection of different waveguide can make two light signal generating couplings between the waveguide destroy the isolation between the different wave length, and the blazed fiber bragg grating in the waveguide need be made in the scope consistent with the transverse width of waveguide; Its reflectivity to the respective wavelength signal is restricted, and this makes phase mutual interference between the wavelength signals of Add/drop Voice Channel; If the lateral dimension of waveguide is increased, then face the problem of the decline of optical signal quality, this makes its practicality reduce greatly.
As the basic component of Add/drop Voice Channel device, the performance of wavelength division multiplexer has decisive influence to the overall performance of corresponding Add/drop Voice Channel device.All kinds of Add/drop Voice Channel devices all can't be broken away from the inborn structural disadvantages of wavelength division multiplexer of counter structure.And the wavelength division multiplexer Practical Performance of full optical fiber is still waiting to improve; Exist problems, for example, relate to a kind of Add/drop Voice Channel device in the one Chinese patent application 201020635670.8 based on twin-core fiber; Wavelength selection function wherein is based on the disc waveguide at the fibre core place of twin-core fiber; It is big in twin-core fiber, to make the disc waveguide difficulty, and the selection performance of wavelength depended on the control of disc waveguide precision has increased difficulty and degree of accuracy that wavelength is selected.And how wherein said structure realizes that up channel is connected the also very big difficulty of existence with the low-loss of drop Voice Channel.
Therefore, the problem that present light Add/drop Voice Channel device faces is: complex structure, volume is big, manufacture difficulty is big, cost is high, it is big to insert loss, and the isolation of different wave length channel is poor.
Summary of the invention
Technical matters to be solved by this invention is: present light Add/drop Voice Channel device faces complex structure, volume is big, manufacture difficulty is big, cost is high, the insertion loss is big, the problem of the isolation difference of different wave length channel.
Technical scheme of the present invention is:
Add/drop Voice Channel device based on blazed fiber bragg grating; This Add/drop Voice Channel device comprises light-sensitive optical fibre; First to N up channel light-sensitive optical fibre; First to N drop Voice Channel optical fiber, respectively with ultraviolet photolithographic write on first to the N up channel light-sensitive optical fibre first to N up channel blazed fiber bragg grating, be scribed at first on the light-sensitive optical fibre to N drop Voice Channel blazed fiber bragg grating successively.
1 port is the drop Voice Channel input port; The straight-through port of 2 port non-processor wavelength and the output port of up channel wavelength; First to the drop Voice Channel output port of N drop Voice Channel port for the wavelength signals of needs processing; First to N up channel port for having handled the up channel input port of wavelength.
Light-sensitive optical fibre is in the same plane and parallel placement with the first drop Voice Channel optical fiber; The edge minimum distance is h; The one-tenth grid face of the first drop Voice Channel blazed fiber bragg grating becomes the θ angle with light-sensitive optical fibre, vertical with the residing plane of the first drop Voice Channel optical fiber with light-sensitive optical fibre, and satisfies: 0 °＜θ＜45 °.So-called become the grid face to be that in the index modulation zone a series of planes of identical refractive index in the fiber grating, these planes are parallel to each other.So-called edge minimum distance is the value that two optical fiber axle center distances deduct the radius gained of two optical fiber.
Light-sensitive optical fibre is in the same plane and parallel placement with the second drop Voice Channel optical fiber; The edge minimum distance is h; The one-tenth grid face of the second drop Voice Channel blazed fiber bragg grating becomes the θ angle with light-sensitive optical fibre, vertical with the residing plane of the second drop Voice Channel optical fiber with light-sensitive optical fibre, and satisfies: 0 °＜θ＜45 °.
Light-sensitive optical fibre is in the same plane and parallel placement with the 3rd drop Voice Channel optical fiber; The edge minimum distance is h; The one-tenth grid face of the 3rd drop Voice Channel blazed fiber bragg grating becomes the θ angle with light-sensitive optical fibre, vertical with the residing plane of the 3rd drop Voice Channel optical fiber with light-sensitive optical fibre, and satisfies: 0 °＜θ＜45 °.
Light-sensitive optical fibre is in the same plane and parallel placement with N drop Voice Channel optical fiber; The edge minimum distance is h; The one-tenth grid face of N drop Voice Channel blazed fiber bragg grating becomes the θ angle with light-sensitive optical fibre, vertical with the residing plane of N drop Voice Channel optical fiber with light-sensitive optical fibre, and satisfies: 0 °＜θ＜45 °.
Light-sensitive optical fibre is in the same plane and parallel placement with the first up channel light-sensitive optical fibre; The edge minimum distance is h; The one-tenth grid face of the first up channel blazed fiber bragg grating becomes the θ angle with the first up channel light-sensitive optical fibre; Vertical with light-sensitive optical fibre with the residing plane of the first up channel light-sensitive optical fibre, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre is in the same plane and parallel placement with the second up channel light-sensitive optical fibre; The edge minimum distance is h; The one-tenth grid face of the second up channel blazed fiber bragg grating becomes the θ angle with the second up channel light-sensitive optical fibre; Vertical with light-sensitive optical fibre with the residing plane of the second up channel light-sensitive optical fibre, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre is in the same plane and parallel placement with the 3rd up channel light-sensitive optical fibre; The edge minimum distance is h; The one-tenth grid face of the 3rd up channel blazed fiber bragg grating becomes the θ angle with the 3rd up channel light-sensitive optical fibre; Vertical with light-sensitive optical fibre with the residing plane of the 3rd up channel light-sensitive optical fibre, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre is in the same plane and parallel placement with N up channel light-sensitive optical fibre; The edge minimum distance is h; The one-tenth grid face of N up channel blazed fiber bragg grating becomes the θ angle with N up channel light-sensitive optical fibre; Vertical with light-sensitive optical fibre with the residing plane of N up channel light-sensitive optical fibre, and satisfy: 0 °＜θ＜45 °.
Described h satisfies: 0≤h≤10cm.
Described N is an integer, and satisfies: N >=1.
The drop Voice Channel light signal is imported from 1 port, transfers to the first drop Voice Channel blazed fiber bragg grating along light-sensitive optical fibre, and the light signal in its bandwidth is coupled to the first drop Voice Channel optical fiber, exports from the first drop Voice Channel port; Light signal outside the first drop Voice Channel blazed fiber bragg grating bandwidth directly continues transmission through the first drop Voice Channel blazed fiber bragg grating along light-sensitive optical fibre; Close bundle with transfer to the light signal that the first up channel blazed fiber bragg grating is coupled to light-sensitive optical fibre from first up channel port input along the first up channel light-sensitive optical fibre, and continue transmission along light-sensitive optical fibre.
Transfer to the second drop Voice Channel blazed fiber bragg grating along light-sensitive optical fibre, the light signal in its bandwidth is coupled to the second drop Voice Channel optical fiber, exports from the second drop Voice Channel port; Light signal outside the second drop Voice Channel blazed fiber bragg grating bandwidth directly continues transmission through the second drop Voice Channel blazed fiber bragg grating along light-sensitive optical fibre; Close bundle with transfer to the light signal that the second up channel blazed fiber bragg grating is coupled to light-sensitive optical fibre from second up channel port input along the second up channel light-sensitive optical fibre, and continue transmission along light-sensitive optical fibre.
Transfer to the 3rd drop Voice Channel blazed fiber bragg grating along light-sensitive optical fibre, the light signal in its bandwidth is coupled to the 3rd drop Voice Channel optical fiber, exports from the 3rd drop Voice Channel port; Light signal outside the 3rd drop Voice Channel blazed fiber bragg grating bandwidth directly continues transmission through the 3rd drop Voice Channel blazed fiber bragg grating along light-sensitive optical fibre; Close bundle with transfer to the light signal that the 3rd up channel blazed fiber bragg grating is coupled to light-sensitive optical fibre from the 3rd up channel port input along the 3rd up channel light-sensitive optical fibre, and continue transmission along light-sensitive optical fibre.
Transfer to N drop Voice Channel blazed fiber bragg grating along light-sensitive optical fibre, the light signal in its bandwidth is coupled to N drop Voice Channel optical fiber, exports from N drop Voice Channel port; Light signal outside N drop Voice Channel blazed fiber bragg grating bandwidth directly continues transmission through N drop Voice Channel blazed fiber bragg grating along light-sensitive optical fibre; Close bundle with transfer to the light signal that N up channel blazed fiber bragg grating is coupled to light-sensitive optical fibre from N up channel port input along N up channel light-sensitive optical fibre, and transfer to the output of 2 ports along light-sensitive optical fibre.
Centre wavelength, the bandwidth of the described first up channel blazed fiber bragg grating and the first drop Voice Channel blazed fiber bragg grating are all consistent.
Centre wavelength, the bandwidth of the described second up channel blazed fiber bragg grating and the second drop Voice Channel blazed fiber bragg grating are all consistent.
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Centre wavelength, the bandwidth of described the 3rd up channel blazed fiber bragg grating and the 3rd drop Voice Channel blazed fiber bragg grating are all consistent.
Centre wavelength, the bandwidth of described N up channel blazed fiber bragg grating and N drop Voice Channel blazed fiber bragg grating are all consistent.
First centre wavelength difference, the bandwidth to N up channel blazed fiber bragg grating do not have public part.
Described first is spaced along light-sensitive optical fibre to N up channel blazed fiber bragg grating to N drop Voice Channel blazed fiber bragg grating and first, promptly put in order into:
The first drop Voice Channel blazed fiber bragg grating, the first up channel blazed fiber bragg grating, the second drop Voice Channel blazed fiber bragg grating; The second up channel blazed fiber bragg grating; The 3rd drop Voice Channel blazed fiber bragg grating, the 3rd drop Voice Channel blazed fiber bragg grating ... N drop Voice Channel blazed fiber bragg grating, N up channel blazed fiber bragg grating.
Described light-sensitive optical fibre, first all places air, water, refractive index index-matching fluid or the quartz crystal smaller or equal to the fibre cladding refractive index to N drop Voice Channel optical fiber to N up channel light-sensitive optical fibre and first.
Described first to N up channel blazed fiber bragg grating and first to N drop Voice Channel blazed fiber bragg grating be Bragg blazed fiber bragg grating, long period blazed fiber bragg grating, the take a sample blazed fiber bragg grating or the blazed fiber bragg grating of warbling.The one-tenth grid face of Bragg blazed fiber bragg grating, long period blazed fiber bragg grating, the take a sample blazed fiber bragg grating or the blazed fiber bragg grating of warbling becomes the θ angle with optical fiber.The index modulation cycle of Bragg blazed fiber bragg grating less than 1 micron, index modulation cycle of long period blazed fiber bragg grating greater than 1 micron.
When satisfied 45 °＜θ＜90 °; Light signal is coupled into light-sensitive optical fibre and along propagating in the other direction through first to N up channel blazed fiber bragg grating, and light signal is coupled into first to N drop Voice Channel optical fiber and along propagating through first in the other direction to N drop Voice Channel blazed fiber bragg grating.
The present invention compares the beneficial effect that is had with prior art:
Compare the Add/drop Voice Channel device based on dielectric film wave filter wavelength division multiplexer, structure according to the invention is full fibre-optical substrate, becomes possibility with the low-loss welding of fibre circuit, and need not the dielectric film of larger volume, has reduced the insertion loss; Compare the Add/drop Voice Channel device based on coupling mechanism, structure according to the invention promotes the selectivity of wavelength greatly, and the selection of wavelength and wave band is controlled arbitrarily through the wavelength and the bandwidth of adjustment blazed fiber bragg grating; Compare the Add/drop Voice Channel device based on the body diffraction grating, the selection of structure medium wavelength according to the invention relies on blazed fiber bragg grating, and manufacturing technology is ripe, and precision is high, and is repeatable strong; Compare Add/drop Voice Channel device based on array waveguide grating; Structure according to the invention is an all optical fibre structure; Volume reduces greatly, and stability improves, and wavelength and wave band quantity control through the quantity that changes blazed fiber bragg grating; Workable, and the increase of number of wavelengths brings difficulty can't for the making of total.Compare the Add/drop Voice Channel device of existing all optical fibre structure, structure according to the invention requires at the craft precision that inserts loss, making, the influence of adjacent channel all reduces greatly.The difference maximum with existing Add/drop Voice Channel device is; Most Add/drop Voice Channel device light paths are reversible; When realizing the light signal Add/drop Voice Channel, to face the problem of signal feedback, need to install isolator additional at each port in order addressing this problem, this makes cost further increase; And the insertion loss is also bigger; Structure of the present invention itself has the function of isolator, and the light signal that is decided to be the Add/drop Voice Channel wavelength for frequency-selecting does not have the reversibility of light path in this structure, reduced light signal fed back greatly to the total system Effect on Performance.
Description of drawings
Fig. 1 is the Add/drop Voice Channel device based on blazed fiber bragg grating of 0 °＜θ＜45 °.
Fig. 2 is single up channel of 0 °＜θ＜45 °, the Add/drop Voice Channel device based on blazed fiber bragg grating of single drop Voice Channel.
Fig. 3 is single up channel of 45 °＜θ＜90 °, the Add/drop Voice Channel device based on blazed fiber bragg grating of single drop Voice Channel.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment one
Add/drop Voice Channel device based on blazed fiber bragg grating; Like Fig. 1; This Add/drop Voice Channel device comprises light-sensitive optical fibre 9; First to N up channel light-sensitive optical fibre 81,82,83 ..., 8N; First to N drop Voice Channel optical fiber 71,72,73 ..., 7N, respectively with ultraviolet photolithographic write on first to N up channel light-sensitive optical fibre 81,82,83 ..., 8N last first to N up channel blazed fiber bragg grating 61,62,63 ..., 6N, be scribed at successively first on the light-sensitive optical fibre 9 to N drop Voice Channel blazed fiber bragg grating 51,52,53 ..., 5N.
1 port one is the drop Voice Channel input port; The straight-through port of 2 ports, 2 non-processor wavelength and the output port of up channel wavelength; First to N drop Voice Channel port 31,32,33 ..., 3N is the drop Voice Channel output port of wavelength signals that need to handle; First to N up channel port 41,42,43 ..., 4N has been for handled the up channel input port of wavelength.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the first drop Voice Channel optical fiber 71; The edge minimum distance is h; 9 one-tenth θ angles of one-tenth grid face and light-sensitive optical fibre of the first drop Voice Channel blazed fiber bragg grating 51; Vertical with light-sensitive optical fibre 9 with the first drop Voice Channel optical fiber, 71 residing planes, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the second drop Voice Channel optical fiber 72; The edge minimum distance is h; 9 one-tenth θ angles of one-tenth grid face and light-sensitive optical fibre of the second drop Voice Channel blazed fiber bragg grating 52; Vertical with light-sensitive optical fibre 9 with the second drop Voice Channel optical fiber, 72 residing planes, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the 3rd drop Voice Channel optical fiber 73; The edge minimum distance is h; 9 one-tenth θ angles of one-tenth grid face and light-sensitive optical fibre of the 3rd drop Voice Channel blazed fiber bragg grating 53; Vertical with light-sensitive optical fibre 9 with the 3rd drop Voice Channel optical fiber 73 residing planes, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with N drop Voice Channel optical fiber 7N; The edge minimum distance is h; 9 one-tenth θ angles of the one-tenth grid face of N drop Voice Channel blazed fiber bragg grating 5N and light-sensitive optical fibre; Vertical with light-sensitive optical fibre 9 with the residing plane of N drop Voice Channel optical fiber 7N, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the first up channel light-sensitive optical fibre 81; The edge minimum distance is h; 81 one-tenth θ angles of the one-tenth grid face of the first up channel blazed fiber bragg grating 61 and the first up channel light-sensitive optical fibre; Vertical with light-sensitive optical fibre 9 with the first up channel light-sensitive optical fibre, 81 residing planes, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the second up channel light-sensitive optical fibre 82; The edge minimum distance is h; 82 one-tenth θ angles of the one-tenth grid face of the second up channel blazed fiber bragg grating 62 and the second up channel light-sensitive optical fibre; Vertical with light-sensitive optical fibre 9 with the second up channel light-sensitive optical fibre, 82 residing planes, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the 3rd up channel light-sensitive optical fibre 83; The edge minimum distance is h; 83 one-tenth θ angles of the one-tenth grid face of the 3rd up channel blazed fiber bragg grating 63 and the 3rd up channel light-sensitive optical fibre; Vertical with light-sensitive optical fibre 9 with the 3rd up channel light-sensitive optical fibre 83 residing planes, and satisfy: 0 °＜θ＜45 °.
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Light-sensitive optical fibre 9 is in the same plane and parallel placement with N up channel light-sensitive optical fibre 8N; The edge minimum distance is h; The one-tenth grid face of N up channel blazed fiber bragg grating 6N becomes the θ angle with N up channel light-sensitive optical fibre 8N; Vertical with light-sensitive optical fibre 9, and satisfy: 0 ° of θ＜45 ° with the residing plane of N up channel light-sensitive optical fibre 8N.
Described h satisfies: 0≤h≤10cm.
Described N is an integer, and satisfies: N >=1.
The drop Voice Channel light signal is imported from 1 port one, transfers to the first drop Voice Channel blazed fiber bragg grating 51 along light-sensitive optical fibre 9, and the light signal in its bandwidth is coupled to the first drop Voice Channel optical fiber 71, from 31 outputs of the first drop Voice Channel port; Light signal outside the first drop Voice Channel blazed fiber bragg grating, 51 bandwidth directly continues transmission through the first drop Voice Channel blazed fiber bragg grating 51 along light-sensitive optical fibre 9; Close bundle with transfer to the light signal that the first up channel blazed fiber bragg grating 61 is coupled to light-sensitive optical fibre 9 from the input of the first up channel port 41 along the first up channel light-sensitive optical fibre 81, and continue transmission along light-sensitive optical fibre 9.
Transfer to the second drop Voice Channel blazed fiber bragg grating 52 along light-sensitive optical fibre 9, the light signal in its bandwidth is coupled to the second drop Voice Channel optical fiber 72, from 32 outputs of the second drop Voice Channel port; Light signal outside the second drop Voice Channel blazed fiber bragg grating, 52 bandwidth directly continues transmission through the second drop Voice Channel blazed fiber bragg grating 52 along light-sensitive optical fibre 9; Close bundle with transfer to the light signal that the second up channel blazed fiber bragg grating 62 is coupled to light-sensitive optical fibre 9 from the input of the second up channel port 42 along the second up channel light-sensitive optical fibre 82, and continue transmission along light-sensitive optical fibre 9.
Transfer to the 3rd drop Voice Channel blazed fiber bragg grating 53 along light-sensitive optical fibre 9, the light signal in its bandwidth is coupled to the 3rd drop Voice Channel optical fiber 73, from 33 outputs of the 3rd drop Voice Channel port; Light signal outside the 3rd drop Voice Channel blazed fiber bragg grating 53 bandwidth directly continues transmission through the 3rd drop Voice Channel blazed fiber bragg grating 53 along light-sensitive optical fibre 9; Close bundle with transfer to the light signal that the 3rd up channel blazed fiber bragg grating 63 is coupled to light-sensitive optical fibre 9 from the input of the 3rd up channel port 43 along the 3rd up channel light-sensitive optical fibre 83, and continue transmission along light-sensitive optical fibre 9.
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Transfer to N drop Voice Channel blazed fiber bragg grating 5N along light-sensitive optical fibre 9, the light signal in its bandwidth is coupled to N drop Voice Channel optical fiber 7N, exports from N drop Voice Channel port 3N; Light signal outside N drop Voice Channel blazed fiber bragg grating 5N bandwidth directly continues transmission through N drop Voice Channel blazed fiber bragg grating 5N along light-sensitive optical fibre 9; Close bundle with transfer to the light signal that N up channel blazed fiber bragg grating 6N is coupled to light-sensitive optical fibre 9 from N up channel port 4N input along N up channel light-sensitive optical fibre 8N, and transfer to 2 outputs of 2 ports along light-sensitive optical fibre 9.
Centre wavelength, the bandwidth of the described first up channel blazed fiber bragg grating 61 and the first drop Voice Channel blazed fiber bragg grating 51 are all consistent.
Centre wavelength, the bandwidth of the described second up channel blazed fiber bragg grating 62 and the second drop Voice Channel blazed fiber bragg grating 52 are all consistent.
Centre wavelength, the bandwidth of described the 3rd up channel blazed fiber bragg grating 63 and the 3rd drop Voice Channel blazed fiber bragg grating 53 are all consistent.
Centre wavelength, the bandwidth of described N up channel blazed fiber bragg grating 6N and N drop Voice Channel blazed fiber bragg grating 5N are all consistent.
First to N up channel blazed fiber bragg grating 61,62,63 ..., 6N different, the bandwidth of centre wavelength do not have public part.
Described first to N drop Voice Channel blazed fiber bragg grating 51,52,53 ..., 5N and first to N up channel blazed fiber bragg grating 61,62,63 ..., 6N is spaced along light-sensitive optical fibre 9, promptly put in order into:
The first drop Voice Channel blazed fiber bragg grating, 51, the first up channel blazed fiber bragg gratings, 61, the second drop Voice Channel blazed fiber bragg gratings 52; The second up channel blazed fiber bragg grating 62; The 3rd drop Voice Channel blazed fiber bragg grating 53, the three drop Voice Channel blazed fiber bragg gratings 63 ... N drop Voice Channel blazed fiber bragg grating 5N, N up channel blazed fiber bragg grating 6N.
Described light-sensitive optical fibre 9, the first to N up channel light-sensitive optical fibre 81,82,83 ..., 8N and first to N drop Voice Channel optical fiber 71,72,73 ..., 7N all places air, water, refractive index index-matching fluid or the quartz crystal smaller or equal to the fibre cladding refractive index.
Described first to N up channel blazed fiber bragg grating 61,62,63 ..., 6N and first to N drop Voice Channel blazed fiber bragg grating 51,52,53 ..., 5N is Bragg blazed fiber bragg grating, long period blazed fiber bragg grating, the take a sample blazed fiber bragg grating or the blazed fiber bragg grating of warbling.
The index modulation cycle of Bragg blazed fiber bragg grating is less than 1 micron;
The index modulation cycle of long period blazed fiber bragg grating is greater than 1 micron;
There are a plurality of sudden change values in the index modulation cycle of sampling blazed fiber bragg grating;
The warble index modulation cycle gradual change of blazed fiber bragg grating.
Embodiment two
Add/drop Voice Channel device based on blazed fiber bragg grating; Like Fig. 2; This Add/drop Voice Channel device comprises light-sensitive optical fibre 9, the first up channel light-sensitive optical fibres 81, the first drop Voice Channel optical fiber 71; Write on the first up channel blazed fiber bragg grating 61 on the first up channel light-sensitive optical fibre 81 with ultraviolet photolithographic, be scribed at the first drop Voice Channel blazed fiber bragg grating 51 on the light-sensitive optical fibre 9.
1 port one is the drop Voice Channel input port; The straight-through port of 2 ports, 2 non-processor wavelength and the output port of up channel wavelength; The first drop Voice Channel port 31 is the drop Voice Channel output port that needs the wavelength signals of processing; The first up channel port 41 is for handle the up channel input port of wavelength.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the first drop Voice Channel optical fiber 71; The edge minimum distance is h; 9 one-tenth θ angles of one-tenth grid face and light-sensitive optical fibre of the first drop Voice Channel blazed fiber bragg grating 51; Vertical with light-sensitive optical fibre 9 with the first drop Voice Channel optical fiber, 71 residing planes, and satisfy: 0 °＜θ＜45 °.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the first up channel light-sensitive optical fibre 81; The edge minimum distance is h; 81 one-tenth θ angles of the one-tenth grid face of the first up channel blazed fiber bragg grating 61 and the first up channel light-sensitive optical fibre; Vertical with light-sensitive optical fibre 9 with the first up channel light-sensitive optical fibre, 81 residing planes, and satisfy: 0 °＜θ＜45 °.
Described h satisfies: 0≤h≤10cm.
The drop Voice Channel light signal is imported from 1 port one, transfers to the first drop Voice Channel blazed fiber bragg grating 51 along light-sensitive optical fibre 9, and the light signal in its bandwidth is coupled to the first drop Voice Channel optical fiber 71, from 31 outputs of the first drop Voice Channel port; Light signal outside the first drop Voice Channel blazed fiber bragg grating, 51 bandwidth directly continues transmission through the first drop Voice Channel blazed fiber bragg grating 51 along light-sensitive optical fibre 9; Close bundle with transfer to the light signal that the first up channel blazed fiber bragg grating 61 is coupled to light-sensitive optical fibre 9 from the input of the first up channel port 41 along the first up channel light-sensitive optical fibre 81, and continue to transfer to 2 outputs of 2 ports along light-sensitive optical fibre 9.
Centre wavelength, the bandwidth of the described first up channel blazed fiber bragg grating 61 and the first drop Voice Channel blazed fiber bragg grating 51 are all consistent.
Described light-sensitive optical fibre 9, the first up channel light-sensitive optical fibres 81 and the first drop Voice Channel optical fiber 71 all place air.
The described first up channel blazed fiber bragg grating 61 and the first drop Voice Channel blazed fiber bragg grating 51 are the blazed fiber bragg grating of warbling.Realize the Add/drop Voice Channel function of broadband light wave band.
Embodiment three
Add/drop Voice Channel device based on blazed fiber bragg grating; Like Fig. 3; This Add/drop Voice Channel device comprises light-sensitive optical fibre 9, the first up channel light-sensitive optical fibres 81, the first drop Voice Channel optical fiber 71; Write on the first up channel blazed fiber bragg grating 61 on the first up channel light-sensitive optical fibre 81 with ultraviolet photolithographic, be scribed at the first drop Voice Channel blazed fiber bragg grating 51 on the light-sensitive optical fibre 9.
1 port one is the drop Voice Channel input port; The straight-through port of 2 ports, 2 non-processor wavelength and the output port of up channel wavelength; The first drop Voice Channel port 31 is the drop Voice Channel output port that needs the wavelength signals of processing; The first up channel port 41 is for handle the up channel input port of wavelength.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the first drop Voice Channel optical fiber 71; The edge minimum distance is h; 9 one-tenth θ angles of one-tenth grid face and light-sensitive optical fibre of the first drop Voice Channel blazed fiber bragg grating 51; Vertical with light-sensitive optical fibre 9 with the first drop Voice Channel optical fiber, 71 residing planes, and satisfy: 45 °＜θ＜90 °.
Light-sensitive optical fibre 9 is in the same plane and parallel placement with the first up channel light-sensitive optical fibre 81; The edge minimum distance is h; 81 one-tenth θ angles of the one-tenth grid face of the first up channel blazed fiber bragg grating 61 and the first up channel light-sensitive optical fibre; Vertical with light-sensitive optical fibre 9 with the first up channel light-sensitive optical fibre, 81 residing planes, and satisfy: 45 °＜θ＜90 °.
Described h satisfies: 0≤h≤10cm.
The drop Voice Channel light signal is imported from 1 port one, transfers to the first drop Voice Channel blazed fiber bragg grating 51 along light-sensitive optical fibre 9, and the light signal in its bandwidth is coupled to the first drop Voice Channel optical fiber 71, along transferring to 31 outputs of the first drop Voice Channel port in the other direction; Light signal outside the first drop Voice Channel blazed fiber bragg grating, 51 bandwidth directly continues transmission through the first drop Voice Channel blazed fiber bragg grating 51 along light-sensitive optical fibre 9; Close bundle with transfer to the light signal that the first up channel blazed fiber bragg grating 61 is coupled to light-sensitive optical fibre 9 from the input of the first up channel port 41 along the first up channel light-sensitive optical fibre 81, and continue to transfer to 2 outputs of 2 ports along light-sensitive optical fibre 9.
Centre wavelength, the bandwidth of the described first up channel blazed fiber bragg grating 61 and the first drop Voice Channel blazed fiber bragg grating 51 are all consistent.
Described light-sensitive optical fibre 9, the first up channel light-sensitive optical fibres 81 and the first drop Voice Channel optical fiber 71 all place water.
The described first up channel blazed fiber bragg grating 61 and the first drop Voice Channel blazed fiber bragg grating 51 are the blazed fiber bragg grating of warbling.Realize the Add/drop Voice Channel function of broadband light wave band.
Claims (8)
1. based on the Add/drop Voice Channel device of blazed fiber bragg grating; It is characterized in that: this Add/drop Voice Channel device comprises light-sensitive optical fibre (9); First to N up channel light-sensitive optical fibre (81,82,83 ..., 8N); First to N drop Voice Channel optical fiber (71,72,73 ..., 7N); Respectively with ultraviolet photolithographic write on first to N up channel light-sensitive optical fibre (81,82,83 ..., 8N) on first to N up channel blazed fiber bragg grating (61,62,63 ..., 6N), be scribed at successively first on the light-sensitive optical fibre (9) to N drop Voice Channel blazed fiber bragg grating (51,52,53 ..., 5N);
1 port (1) is the drop Voice Channel input port; The straight-through port of 2 ports (2) non-processor wavelength and the output port of up channel wavelength; First to N drop Voice Channel end (31,32,33 ..., 3N) be the drop Voice Channel output port of wavelength signals that need to handle; First to N up channel end (41,42,43 ..., 4N) for having handled the up channel input port of wavelength;
Light-sensitive optical fibre (9) is in the same plane and parallel placement with the first drop Voice Channel optical fiber (71); The edge minimum distance is h; The one-tenth grid face of the first drop Voice Channel blazed fiber bragg grating (51) becomes 0 angle with light-sensitive optical fibre (9); Vertical with light-sensitive optical fibre (9) with the residing plane of the first drop Voice Channel optical fiber (71), and satisfy: 0 °＜θ＜45 °;
Light-sensitive optical fibre (9) is in the same plane and parallel placement with the second drop Voice Channel optical fiber (72); The edge minimum distance is h; The one-tenth grid face of the second drop Voice Channel blazed fiber bragg grating (52) becomes the θ angle with light-sensitive optical fibre (9); Vertical with light-sensitive optical fibre (9) with the residing plane of the second drop Voice Channel optical fiber (72), and satisfy: 0 °＜θ＜45 °;
Light-sensitive optical fibre (9) is in the same plane and parallel placement with the 3rd drop Voice Channel optical fiber (73); The edge minimum distance is h; The one-tenth grid face of the 3rd drop Voice Channel blazed fiber bragg grating (53) becomes the θ angle with light-sensitive optical fibre (9); Vertical with light-sensitive optical fibre (9) with the residing plane of the 3rd drop Voice Channel optical fiber (73), and satisfy: 0 °＜θ＜45 °;
Light-sensitive optical fibre (9) is in the same plane and parallel placement with N drop Voice Channel optical fiber (7N); The edge minimum distance is h; The one-tenth grid face of N drop Voice Channel blazed fiber bragg grating (5N) becomes the θ angle with light-sensitive optical fibre (9); Vertical with light-sensitive optical fibre (9) with the residing plane of N drop Voice Channel optical fiber (7N), and satisfy: 0 °＜θ＜45 °;
Light-sensitive optical fibre (9) is in the same plane and parallel placement with the first up channel light-sensitive optical fibre (81); The edge minimum distance is h; The one-tenth grid face of the first up channel blazed fiber bragg grating (61) becomes the θ angle with the first up channel light-sensitive optical fibre (81); Vertical with light-sensitive optical fibre (9) with the residing plane of the first up channel light-sensitive optical fibre (81), and satisfy: 0 °＜θ＜45 °;
Light-sensitive optical fibre (9) is in the same plane and parallel placement with the second up channel light-sensitive optical fibre (82); The edge minimum distance is h; The one-tenth grid face of the second up channel blazed fiber bragg grating (62) becomes the θ angle with the second up channel light-sensitive optical fibre (82); Vertical with light-sensitive optical fibre (9) with the residing plane of the second up channel light-sensitive optical fibre (82), and satisfy: 0 °＜θ＜45 °;
Light-sensitive optical fibre (9) is in the same plane and parallel placement with the 3rd up channel light-sensitive optical fibre (83); The edge minimum distance is h; The one-tenth grid face of the 3rd up channel blazed fiber bragg grating (63) becomes the θ angle with the 3rd up channel light-sensitive optical fibre (83); Vertical with light-sensitive optical fibre (9) with the residing plane of the 3rd up channel light-sensitive optical fibre (83), and satisfy: 0 °＜θ＜45 °;
Light-sensitive optical fibre (9) is in the same plane and parallel placement with N up channel light-sensitive optical fibre (8N); The edge minimum distance is h; The one-tenth grid face of N up channel blazed fiber bragg grating (6N) becomes the θ angle with N up channel light-sensitive optical fibre (8N); Vertical with light-sensitive optical fibre (9) with the residing plane of N up channel light-sensitive optical fibre (8N), and satisfy: 0 °＜θ＜45 °.
2. the Add/drop Voice Channel device based on blazed fiber bragg grating according to claim 1 is characterized in that:
Described h satisfies: 0≤h≤10cm;
Described N is an integer, and satisfies: N >=1.
3. the Add/drop Voice Channel device based on blazed fiber bragg grating according to claim 1 is characterized in that:
The drop Voice Channel light signal transfers to the first drop Voice Channel blazed fiber bragg grating (51) from 1 port (1) input along light-sensitive optical fibre (9), and the light signal in its bandwidth is coupled to the first drop Voice Channel optical fiber (71), exports from the first drop Voice Channel port (31); Light signal outside first drop Voice Channel blazed fiber bragg grating (51) bandwidth directly continues transmission through the first drop Voice Channel blazed fiber bragg grating (51) along light-sensitive optical fibre (9); Close bundle with transfer to the light signal that the first up channel blazed fiber bragg grating (61) is coupled to light-sensitive optical fibre (9) from the first up channel port (41) input along the first up channel light-sensitive optical fibre (81), and continue transmission along light-sensitive optical fibre (9);
Transfer to the second drop Voice Channel blazed fiber bragg grating (52) along light-sensitive optical fibre (9), the light signal in its bandwidth is coupled to the second drop Voice Channel optical fiber (72), exports from the second drop Voice Channel port (32); Light signal outside second drop Voice Channel blazed fiber bragg grating (52) bandwidth directly continues transmission through the second drop Voice Channel blazed fiber bragg grating (52) along light-sensitive optical fibre (9); Close bundle with transfer to the light signal that the second up channel blazed fiber bragg grating (62) is coupled to light-sensitive optical fibre (9) from the second up channel port (42) input along the second up channel light-sensitive optical fibre (82), and continue transmission along light-sensitive optical fibre (9);
Transfer to the 3rd drop Voice Channel blazed fiber bragg grating (53) along light-sensitive optical fibre (9), the light signal in its bandwidth is coupled to the 3rd drop Voice Channel optical fiber (73), exports from the 3rd drop Voice Channel port (33); Light signal outside the 3rd drop Voice Channel blazed fiber bragg grating (53) bandwidth directly continues transmission through the 3rd drop Voice Channel blazed fiber bragg grating (53) along light-sensitive optical fibre (9); Close bundle with transfer to the light signal that the 3rd up channel blazed fiber bragg grating (63) is coupled to light-sensitive optical fibre (9) from the 3rd up channel port (43) input along the 3rd up channel light-sensitive optical fibre (83), and continue transmission along light-sensitive optical fibre (9);
Transfer to N drop Voice Channel blazed fiber bragg grating (5N) along light-sensitive optical fibre (9), the light signal in its bandwidth is coupled to N drop Voice Channel optical fiber (7N), exports from N drop Voice Channel port (3N); Light signal outside N drop Voice Channel blazed fiber bragg grating (5N) bandwidth directly continues transmission through N drop Voice Channel blazed fiber bragg grating (5N) along light-sensitive optical fibre (9); Close bundle with transfer to the light signal that N up channel blazed fiber bragg grating (6N) is coupled to light-sensitive optical fibre (9) from N up channel port (4N) input along N up channel light-sensitive optical fibre (8N), and transfer to 2 ports (2) output along light-sensitive optical fibre (9).
4. the Add/drop Voice Channel device based on blazed fiber bragg grating according to claim 1 is characterized in that:
Centre wavelength, the bandwidth of the described first up channel blazed fiber bragg grating (61) and the first drop Voice Channel blazed fiber bragg grating (51) are all consistent;
Centre wavelength, the bandwidth of the described second up channel blazed fiber bragg grating (62) and the second drop Voice Channel blazed fiber bragg grating (52) are all consistent;
Centre wavelength, the bandwidth of described the 3rd up channel blazed fiber bragg grating (63) and the 3rd drop Voice Channel blazed fiber bragg grating (53) are all consistent;
Centre wavelength, the bandwidth of described N up channel blazed fiber bragg grating (6N) and N drop Voice Channel blazed fiber bragg grating (5N) are all consistent;
First to N up channel blazed fiber bragg grating (61,62,63 ..., 6N) different, the bandwidth of centre wavelength do not have public part.
5. the Add/drop Voice Channel device based on blazed fiber bragg grating according to claim 1 is characterized in that:
Described first to N drop Voice Channel blazed fiber bragg grating (51,52,53 ..., 5N) and first to N up channel blazed fiber bragg grating (61,62,63 ..., 6N) be spaced along light-sensitive optical fibre (9), promptly put in order into:
The first drop Voice Channel blazed fiber bragg grating (51), the first up channel blazed fiber bragg grating (61), the second drop Voice Channel blazed fiber bragg grating (52); The second up channel blazed fiber bragg grating (62); The 3rd drop Voice Channel blazed fiber bragg grating (53), the 3rd drop Voice Channel blazed fiber bragg grating (63) ... N drop Voice Channel blazed fiber bragg grating (5N), N up channel blazed fiber bragg grating (6N).
6. the Add/drop Voice Channel device based on blazed fiber bragg grating according to claim 1 is characterized in that:
Described light-sensitive optical fibre (9), first to N up channel light-sensitive optical fibre (81,82,83 ..., 8N) and first to N drop Voice Channel optical fiber (71,72,73 ..., 7N) all place air, water, refractive index index-matching fluid or quartz crystal smaller or equal to the fibre cladding refractive index.
7. the Add/drop Voice Channel device based on blazed fiber bragg grating according to claim 1 is characterized in that:
Described first to N up channel blazed fiber bragg grating (61,62,63 ..., 6N) and first to N drop Voice Channel blazed fiber bragg grating (51,52,53 ..., 5N) be Bragg blazed fiber bragg grating, long period blazed fiber bragg grating, the take a sample blazed fiber bragg grating or the blazed fiber bragg grating of warbling.
8. the Add/drop Voice Channel device based on blazed fiber bragg grating according to claim 1 is characterized in that:
When satisfied 45 °＜θ＜90 °; Light signal through first to N up channel blazed fiber bragg grating (61,62,63 ..., 6N) be coupled into light-sensitive optical fibre (9) and along propagating in the other direction, light signal through first to N drop Voice Channel blazed fiber bragg grating (51,52,53 ..., 5N) be coupled into first to N drop Voice Channel optical fiber (71,72,73 ..., 7N) and along propagating in the other direction.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6212318B1 (en) * | 1998-10-22 | 2001-04-03 | Thomas & Betts International, Inc. | Add/drop filters and multiplexers fabricated from cladding mode couplers and fiber bragg gratings |
| CN1430369A (en) * | 2001-12-31 | 2003-07-16 | 深圳朗光科技有限公司 | Coarse wave division complexing apparatus and preparation method of its used conpler |
| CN2650160Y (en) * | 2003-04-15 | 2004-10-20 | 南开大学 | Mechanical adjusting light-modulating attenuator |
| CN101004465A (en) * | 2006-12-31 | 2007-07-25 | 北京交通大学 | Wave combiner / separator composed of tight coupled optical fiber grating group with micro insertion loss |
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2012
- 2012-04-10 CN CN2012101039832A patent/CN102608711A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6212318B1 (en) * | 1998-10-22 | 2001-04-03 | Thomas & Betts International, Inc. | Add/drop filters and multiplexers fabricated from cladding mode couplers and fiber bragg gratings |
| CN1430369A (en) * | 2001-12-31 | 2003-07-16 | 深圳朗光科技有限公司 | Coarse wave division complexing apparatus and preparation method of its used conpler |
| CN2650160Y (en) * | 2003-04-15 | 2004-10-20 | 南开大学 | Mechanical adjusting light-modulating attenuator |
| CN101004465A (en) * | 2006-12-31 | 2007-07-25 | 北京交通大学 | Wave combiner / separator composed of tight coupled optical fiber grating group with micro insertion loss |
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