CN1424829A - Stage linked body holographic grating intensive WDM implement manufacture and system thereof - Google Patents
Stage linked body holographic grating intensive WDM implement manufacture and system thereof Download PDFInfo
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Abstract
A method for preparing cascaded bulk holographic raster DWDM device features that the holographic record medium is divided into different space subregions for recording 1-4 bulk holographic rasters in each subregion, the vector directions of all bulk rastors have a 45 deg of included angle relative to the end face, when raster is recorded by short wavelength, the plane of writing-in beam is perpendicular to the plane of I/O beams, the output channels for all wavelengthes are parallel for highest diffraction efficiency, the diffraction efficiency and wavelength selectivity are optimized, the crosstalking between channels is suppressed, and the service life of raster is elongated by thermal or optical fixing.
Description
Technical field
Stage linked body holographic grating dense wave division multiplexer spare manufacture method and system thereof belong to optical communication technique and sensory field of optic fibre.
Background technology
At present wavelength division multiplex device (WDM) in optical communication system and optical fiber sensing system for enhanced system transmission capacity and the important effect of the positive play more and more of application flexibility.Existing several WDM device comprises Mach-Zehnder interferometer, array waveguide grating (AWG), planar light spectrometer, directional coupler etc.; For the device application of estimating, for example Fiber to the home uses, and big number of active lanes, low insertion loss and the compatibility that is connected coupling, LASER Light Source and detector with optical fiber all are the advantageous characteristic feature of WDM device; In addition, wavelength selectivity and branch light action also are two kinds of desired functional characteristics.
The Bragg grating device has high diffraction efficiency, high wavelength selectivity and high angular selectivity, being subjected to considerable research recent years pays close attention to, the device described in following list of references [1]-[4] for example: [1] Piepaolo Boffi, Maria Chiara Ubaldi Piccinin, Claudio Frascolla, and Mario Martinelli, " 1550-nm Volume Holography for Optical Communication Devices ", IEEE Photonics Technol.Lett., Vol.12, No.10, pp.1355,2000[2] Xiaoli Fu, Martin Fay, and J.M.Xu, " 1 * 8 Supergrating wavelength-division demultiplexer in a silica planar waveguide ", Optics Letters, Vol.22, No.21, pp.1627,1997[3] Revital Shechter, Yaakov Amital, and Asher A.Friesem, " Compact wavelength division multiplexers and demultiplexers ", Applied Optics, Vol.41, No.7, pp.1256,2002[4] United States Patent (USP) U.S.Pat.No.5,970,190.
These devices adopt proximal surface input path (i.e. 90 ° of light paths) or transmission-type record how much usually with the pairing grating multiplexing recording of different wave length passage the same area at medium, and Fig. 1 has provided a typical device example, and the 1st, comprise wavelength X
1And λ
2Reading optical beam, the 2nd, body holographic recording medium, the 3rd, corresponding wavelength λ
1Diffraction light, the 4th, corresponding wavelength λ
2Diffraction light, 5 and 6 is two body gratings that overlap that are recorded in the medium, grating vector separately is respectively K
1And K
2Its cardinal principle is: for given body grating, have only the angle θ of input light
iAnd wavelength X
iRelation between (i=1,2) satisfies Bragg condition 2 Λ
iSin θ
i=λ
i(Λ wherein
iBe corresponding wavelength λ
1The grating fringe face between spacing, θ
iBe the angle between incident light and the grating fringe face), just can produce effective diffraction and promptly export light.
The major defect of these devices is: 1) owing to the pairing grating multiplexing recording of different wave length passage the same area at medium, when body grating uses as wavelength multiplexing (or demultiplexing) device, usually require output light (or input light) to propagate, so the grating fringe face of different wavelength correspondences must have different orientation along same direction.Its result, the input light of different wave length passage (or output light) must be propagated along different angle directions, for optical fiber input and output coupling brings huge difficulty; 2) under existing recorded material and technical conditions, because the recording wavelength (being the sensitive wave length of medium) of volume holographic grating differs very big with the infrared communication wave band, if record all adopts 90 ° of light paths with use, bragg condition can not satisfy, and therefore has to adopt very complicated tape deck; 3) use for high density, big figure WDM, the raster count M that superposes in same volume medium is subjected to the limited refractive index dynamic range of recording medium and the restriction of signal to noise ratio, and (the η ∝ 1/M that must cause the diffraction efficiency of each passage seriously to descend
2), promptly serious insertion loss; 4) secondary lobe is higher, and when the wavelength departure peak wavelength, diffraction efficiency is sinc with wavelength change basically
2Functional form, incompatible with the finite bandwidth of light source light spectrum, crosstalk in different interchannels generations; 5) body grating that writes down in photorefractive crystal as easy as rolling off a log being wiped free of and losing in readout repeatedly also can be failed simultaneously in time gradually, produces unacceptable insertion loss.
Summary of the invention
The objective of the invention is to overcome aforementioned disadvantages, propose a kind of the making and simple in structurely be easy to realize, the diffraction efficiency height, have height wavelength selectivity and method and dedicated system thereof good spectral response, stage linked body holographic grating dense wave division multiplexer spare.
Stage linked body holographic grating dense wave division multiplexer spare manufacture method stage linked body holographic grating dense wave division multiplexer spare manufacture method of the present invention, including the diffraction optical element with wavelength filtering function is the volume hologram that optical means is made in essence, that is: the relevant plane light wave of two bundles is intersected in the inside of holographic recording medium, form the interference fringe plane that light and shade replaces; Recording medium is to the strength sensitive of illumination, produce and the proportional variations in refractive index of luminous intensity, thereby form the phase-type body grating, of the present invention it is characterized in that: 1, the body holographic recording medium is divided into different spatial sub zones, one to four volume holographic grating of each spatial sub regional record, the grating vector direction of all volume holographic gratings all becomes miter angle with end face, and the size of grating vector has nothing in common with each other.Be that end face and side (perpendicular to the input and output end face) at medium carries out when 2, writing down volume holographic grating with the short wavelength, it is orthogonal promptly to write the plane at light beam place and plane that the input-output light beam is formed.Thereby do not need to increase complicated refractive index match mechanism.Like this, when the light beam that includes a plurality of wavelength during along the end face vertical-incidence transmission, each grating only satisfies bragg condition to its wavelength of correspondence when the design record, this wavelength of diffraction almost completely, and allow other wavelength see through.3, adopt two-dimensional coupled-wave theory that the diffraction efficiency and the wavelength selectivity of volume holographic grating are optimized.4, adopt the mask that has the hole in the placement of body holographic recording medium surface, the regional exposure that light is only limited the hole is finished the grating that record forms; In order to make body grating that approximate response uniformly be arranged in the wavelength channel bandwidth of using, the secondary lobe beyond the inhibition passage can make the grating index modulation degree become the function of locus.Implementation method is: after grating record is finished, at the front of recording medium 11 placement space optical modulator 24, by the notion of common shading rate but make it by sinc
2Function is wiped with even UV-irradiation then.After this non-homogeneous wiping, obtaining the spatial modulation degree is sinc
2The grating that function distributes.5, for eliminating the volatibility of body grating, prolong the useful life of grating, at last volume holographic grating is carried out heat fixation, or adopt the method for double-colored record in record, to realize photofixation.
Stage linked body holographic grating dense wave division multiplexer spare manufacture method feature also is: 1, the recording method of described volume holographic grating is, the wavelength that laser 7 is sent is λ
WLight form wide collimated light beam through beam-expanding collimation device 8, and through beam splitting-bundling device system 9 be divided into beam intensity ratio be approximately 1: 1 two the bundle, and be directed to the position at body holographic recording medium 11 places of cubic, the two is intersected in medium, and its angle is size 2 α of an appointment
W1, after exposure a period of time, grating promptly forms, after having write down a grating, again body holographic recording medium 11 is moved to adjacent next record position, and change the direction of two writing light beams simultaneously symmetrically, make its angle change into 2 α by beam splitting-bundling device system 9
W2, write down next grating ... .., so move in circles, after finishing, all N grating record be fixed, form the wavelength division multiplex device of N passage.
Among the present invention surface with the mask screen body holographic recording medium 11 that has rectangular aperture, the crystalline region exposure that two-beam is only limited the square hole, and adjacent body grating is closely linked to each other and non-overlapping copies.During 2, owing to record, (for example the normal of end face L * W) is within the same plane for the direction of propagation of two writing light beams and body holographic recording medium 11 some surfaces, (H * W) becomes miter angle to make grating vector direction and end face, so after end face has write down N holographic grating and has fixed, can be with body holographic recording medium 11 around end face normal direction half-twist, write down N grating again, form the wavelength division multiplex device of 2N passage; And the like a surface recording 2N hologram and fixing after, can be on another surface (side H * for example L) again with 2N hologram of the same manner record, the wavelength division multiplex device of 4N passage of formation.Since 4 holograms of at most only multiplexing storage in same volume, and adopted technique for fixing, and each passage still can obtain very high diffraction efficiency.When the tandem type body grating that 3, is made into is used as the wave multiplexer spare (being multiplexing device) of wavelength division multiplexing, be to use wavelength to be λ
iInput light along being coupled to some passage i perpendicular to the direction of body holographic recording medium 11 end faces, bottom surface or side, the light of different wave length all converges from terminal surface D, becomes to close ripple output.
When the tandem type body grating that is made into is used as the wave-dividing device (being the demultiplexing device) of wavelength division multiplexing, will contain a plurality of use wavelength X
1, λ
2...., λ
i... input light along perpendicular to end face C direction input, its medium wavelength is λ
iLight will export by corresponding output face by i passage, become an angle of 90 degrees between input signal beam and the output beam.The less device of port number also can be used as the set out on a journey device and the following road device of optical wavelength-division multiplex.Fig. 5 is the schematic diagram of the tandem type body grating of N passage as the demultiplexing device of wavelength division multiplexing.4, when the pairing passage i of the different use wavelength X i of record, record angle 2 α that adopted
WiDetermine by following formula:
λ wherein
WBe recording wavelength, n
iBe that recording materials are at λ
iRefractive index.n
iBe that recording materials are at λ
iRefractive index, when using up when selling off lithium columbate crystal n as recording materials
iWith n
iWith λ
iThe pass be:
T is an absolute temperature in the formula.5, the grating that relates to owing to this type of device is present in the limited bulk of three-dimensional medium, if its diffraction property is with traditional Kogelnik theory, promptly at H.Kogelnik, " Coupled wave theoryfor thick hologram gratings ", The Bell Syst.Tech.J., Vol.48,2909-2947, describing of putting down in writing in 1969 documents will have than mistake.The present invention at two-dimensional coupled-wave theory promptly at L.Solymar and D.J.Cooke, " Volume Holography and VolumeGratings ", Academic Press, London, 1981, developed a kind of effective algorithm on the basis of the theory of putting down in writing in the document, its basic point is to adopt the finite difference calculus direct integral to find the solution the coupling partial differential equation of binary, thereby grating diffration efficient, wavelength selectivity and response characteristic are optimized.6, as adopting two plane wave recording holographic gratings, the grating that obtains has the uniform modulation degree in space.The spectral response of this grating is sinc
2Function type promptly when wavelength departure centre wavelength, also some secondary lobes can occur in the process that diffraction efficiency descends with wavelength, cause different interchannels intolerable crosstalking to occur.But according to the two-dimensional coupled-wave theory The numerical results, if the Grating Modulation degree also changes according to certain rules with the space, for example with sinc
2The function rule changes, and secondary lobe just can be inhibited effectively.By when writing down body grating, on light path, add specially designed mask; Perhaps after the record grating is finished and before fixing, place mask at grating surface and carry out non-homogeneous method such as wipe, the modulation degree of grating is changed according to certain rules, effectively suppressed sidelobes with the space, improve the wavelength response characteristic of grating, suppress crosstalking between the output channel.7, the fixing means of holographic body grating can be a heat fixation among the present invention, also can be photofixation; The heat fixation method of holographic grating can be disposable thermal fixing also can be heat fixation in batches, can be overall thermal fixing also can be the local heat fixation.
The dedicated system of the stage linked body holographic grating dense wave division multiplexer spare manufacture method in the technical solution of the present invention is characterised in that: it includes Optical devices, grating is carried out device that non-homogeneous light wipes and the optical transmission part that links to each other with body holographic recording medium 11; Wherein Optical devices comprise that the wavelength that sends is λ
WThe laser 7 of light, λ
WLight is through forming the beam-expanding collimation device 8 of wide collimated light beam, be divided into beam intensity ratio be approximately 1: 1 two-beam and can the accurate beam splitting-bundling device system 9 that adjusts two beam angle, the linear translation platform 17 at supporting mass holographic recording medium 11 and its translation direction and work top angle at 45, linear translation platform 17 vertical fixing optics vibration isolation table 10 thereon; Grating is carried out the device that non-homogeneous light is wiped, comprise the cable 26 that is connected with computer 27, by the optical modulator 24 that cable 26 is connected with computer 27, optical modulator 24 is placed on the front near holographic recording medium 11; The optical transmission that links to each other with body holographic recording medium 11 partly comprises, by N wavelength (λ
1, λ
2...., λ
n) signal beams 18 and the input optical fibre 19 that links to each other with input optical fibre coupling element 20, corresponding with N wavelength, with N output optical fibre coupling element 21 link to each other, a N output optical fibre 22, end face C direction perpendicular to body holographic recording medium 11 is set to: the corresponding output channel of output optical fibre, and become the rule of an angle of 90 degrees to be arranged on the end face of body holographic recording medium 11 according between input signal beam and the output beam.
The beam splitting of the present invention's proposition-close the beam optics system configuration, the linear translation platform that only needs precision of use to control just can be realized the angle control to two beam recording light simultaneously.Referring to Fig. 4, incide on the speculum 14 through lens 13 through expansion bundle and collimated laser light bundle 12, being divided into two-beam also converges to respectively on two other speculum 15, this two-beam after the reflection is more respectively by two lens, 16 collimations, and intersect in recording medium 11, and its angle is size 2 α of an appointment
WiLens 13 and speculum 14 are fixed on the linear translation platform 28 of an accurate control simultaneously, can accurately change angle 2 αs of two writing light beams in medium by translation stage along the fine motion of incident light direction
Wi, guarantee that simultaneously the crossing locus of two light beams is constant.
The body holographic recording medium of selecting in the dedicated system of stage linked body holographic grating dense wave division multiplexer spare manufacture method 11 can be to recording wavelength λ
WResponsive photorefractive crystal also can be to recording wavelength λ
WResponsive isotropic body holographic storage material.The crystalline axis direction of crystal should parallel with the surface and at 45 with end face angle, makes grating vector parallel with crystallographic axis, so that obtain the highest diffraction efficiency; Perhaps the crystalline axis direction of crystal should be along its length, make the angles that all become identical 45 degree towards the grating vector of the different directions of all direction diffraction, so that obtain balanced diffraction efficiency with crystallographic axis.
The present invention proposes a kind of simple body grating holographic recording and optimization method, can guarantee that input channel and output channel angle are 90 degree, the output channel of all wavelengths is parallel mutually, each passage has the maximum diffraction efficient that recording materials may provide, spectral response is good, secondary lobe is suppressed the long-life.
Description of drawings:
Fig. 1: the schematic diagram 1 of the holographic wavelength division multiplex device of conventional bulk, comprise wavelength X
1And λ
2Reading optical beam, 2, be the body holographic recording medium, 3, be corresponding wavelength λ
1Diffraction light, 4, be corresponding wavelength λ
2Diffraction light, 5,6 is two body gratings that overlap that are recorded in the medium, grating vector separately is respectively K
1And K
2
Fig. 2: single-frequency, the single-mode laser of stage linked body holographic grating dense wave division multiplexer spare recording principle Fig. 7, continuously running, 8, the beam-expanding collimation device, 9, beam splitting-close the beam optics system, 10, the optics vibration-isolating platform, 17 precision linear translation stages;
Fig. 3: the definition on cube recording medium 11 shapes and each surface;
Fig. 4: beam splitting-close beam optics system schematic 12, through expanding bundle and collimated laser light bundle, 13, convergent lens, 14,15 speculums, 16, collimating lens, 28, micromotion platform;
Fig. 5: stage linked body holographic grating dense wave division multiplexer spare uses signal Figure 18, comprises N wavelength (λ
1, λ
2...., λ
n) signal beams, 19, input optical fibre, 20, the input optical fibre coupling element, 21, the output optical fibre coupling element, 22, output optical fibre, 23, wavelength is λ
1Output beam;
Fig. 6: the schematic diagram of making non-homogeneous modulated grating; 24, LCD space light modulator, 25, even ultraviolet light, 26, stube cable, 27, computer;
Fig. 7: the three dB bandwidth curve of stage linked body holographic grating dense wave division multiplexer spare;
Fig. 8: the wavelength response curve of each passage of stage linked body holographic grating dense wave division multiplexer spare;
Specific embodiments:
Present embodiment is an example with the wavelength division multiplex device of 8 passages.Adopt preceding method, with the doped iron lithium niobate (Fe:LiNbO of 45 ° of cuttings
3) photorefractive crystal is as recording medium, recording medium 11 is that length is that L, width are W, highly are the cube of H, all surface all is the good optical surface, the definition on its shape and each surface as shown in Figure 3, it is of a size of 8 * 4 * 3 (mm
3).Crystal is placed on the precision linear translation stage 17, and its resolution and reseting precision can reach 0.1 μ m.The precision linear translation stage itself is vertically fixed on the optics vibration isolation table 10, and its translation direction and work top angle at 45.The wavelength that sends from single-frequency, single mode, the laser 7 of running continuously is λ
WThe coherent light of=532nm, the end face A of crystal is incided in process beam splitting-close beam optics system 9 (seeing Fig. 4 for details) symmetrically.For using wavelength X
1=1540nm, the angle of cut that calculates two beam recording light according to aforementioned formula (1) and (2) is 2 α
W1=32.7314 °.Place the mask that has rectangular opening near plane of crystal, the hole is of a size of 3mm * 1mm, the crystalline region exposure that two-beam is only limited the square hole.Through the exposure of about 30sec, write down a grating.The linear translation platform that will support crystal then moves 1mm, finely tunes beam splitting-close the linear translation platform 17 in the beam optics system simultaneously, makes the angle of cut of two light beams change into 2 α
W2=32.7216 °.So proceed, finish until the whole records of the grating of 8 passages.The use wavelength of each passage and recording angular are listed and are seen Table one:
After grating all writes down and finishes, grating is carried out non-homogeneous light to be wiped, method is: with a LCD space light modulator (LCD-SLM) 24 that is connected with computer 27 by cable 26, its resolution is 1024 * 768, and each pixel is of a size of 18 μ m * 18 μ m.At width is LCD-SLM zone (448 row) 8 identical images of loading of 8mm, and the shading rate that makes every row is by sinc
2Function.With the end face A of this LCD-SLM, with the about 5min of even ultraviolet light 25 irradiations, referring to Fig. 6 near crystal 11.Obtaining the spatial modulation degree like this is sinc
2The grating that function distributes.The 24th, LCD space light modulator (LCD-SLM) is that a kind of the loading by computer is the spatial light modulator of electrical addressing, also can be other two dimensional spatial light modulator.
Adopt the method for heat fixation that grating is fixed.Method is: crystal is placed be preheated to 120-140 ℃ heating furnace, and hold warm 20min, naturally cool to room temperature.Use even UV-irradiation development 10min then.
More than the 3dB wavelength bandwidth of 8 gratings be 0.25nm left and right sides (see figure 7), illustrate that the wavelength selectivity of the grating that this method is made satisfies the requirement of channel spacing 0.4nm in the communications applications.The wavelength selectivity curve of each grating is shown in Fig. 8, compares with the grating of even modulation, and secondary lobe is suppressed significantly, has greatly reduced interchannel crosstalking.Table one: the use wavelength and the recording angular of each passage:
| Channel number i | Wavelength X i(nm) | Angle 2 α Wi(°) |
| ???1 | ????1.5400 | ????32.7314 |
| ???2 | ????1.5404 | ????32.7216 |
| ???3 | ????1.5408 | ????32.7118 |
| ???4 | ????1.5412 | ????32.7020 |
| ???5 | ????1.5416 | ????32.6922 |
| ???6 | ????1.5420 | ????32.6825 |
| ???7 | ????1.5424 | ????32.6727 |
| ???8 | ????1.5428 | ????32.6629 |
Claims (12)
1, stage linked body holographic grating dense wave division multiplexer spare manufacture method, including the diffraction optical element with wavelength filtering function is the volume hologram that optical means is made in essence, that is: the relevant plane light wave of two bundles is intersected in the inside of holographic recording medium, form the interference fringe plane that light and shade replaces; Recording medium is to the strength sensitive of illumination, produce and the proportional variations in refractive index of luminous intensity, thereby form the phase-type body grating, the invention is characterized in: 1. the body holographic recording medium is divided into different spatial sub zones, one to four volume holographic grating of each spatial sub regional record, the grating vector direction of all volume holographic gratings all becomes miter angle with end face, and the size of grating vector has nothing in common with each other; 2. adopt on body holographic recording medium surface and place the mask that has the hole, the regional exposure that light is only limited the hole is finished the grating that record forms; Be that end face and side (perpendicular to the input and output end face) at medium carries out when 3. writing down volume holographic grating with the short wavelength, it is orthogonal promptly to write the plane at light beam place and plane that the input-output light beam is formed; 4. adopt two-dimensional coupled-wave theory that the diffraction efficiency and the wavelength selectivity of volume holographic grating are optimized; 5. after grating record is finished, at the front of recording medium placement space optical modulator (24), with this optical modulator (24) near body holographic recording medium (11), by the notion of common shading rate but make it by sinc
2Function is wiped with even UV-irradiation then.After this non-homogeneous wiping, obtaining the spatial modulation degree is sinc
2The grating that function distributes.6. at last volume holographic grating is carried out heat fixation, or adopt the method for double-colored record in record, to realize photofixation.
2, stage linked body holographic grating dense wave division multiplexer spare manufacture method according to claim 1 is characterized in that the recording method of described volume holographic grating is, the wavelength that laser (7) is sent is λ
WLight through the beam-expanding collimation device (8) form wide collimated light beam, and through beam splitting-bundling device system (9) be divided into beam intensity ratio be approximately 1: 1 two the bundle, and be directed to the position at body holographic recording medium (11) place of cubic, the two is intersected in medium, and its angle is size 2 α of an appointment
W1, after exposure a period of time, grating promptly forms, after having write down a grating, again body holographic recording medium (11) is moved to adjacent next record position, and, make its angle change into 2 α by the direction that beam splitting-bundling device system (9) changes two writing light beams simultaneously symmetrically
W2, write down next grating ... .., so move in circles, after finishing, all N grating record be fixed, form the wavelength division multiplex device of N passage.
3, stage linked body holographic grating dense wave division multiplexer spare manufacture method according to claim 1 and 2, the recording method feature of described volume holographic grating also is, because during record, (for example the normal of end face L * W) is within the same plane for the direction of propagation of two writing light beams and the some surfaces of body holographic recording medium (11), (H * W) becomes miter angle to make grating vector direction and end face, so after end face has write down N holographic grating and has fixed, can be with body holographic recording medium (11) around end face normal direction half-twist, write down N grating again, form the wavelength division multiplex device of 2N passage; And the like a surface recording 2N hologram and fixing after, can be on another surface (side H * for example L) again with 2N hologram of the same manner record, the wavelength division multiplex device of 4N passage of formation.
4, stage linked body holographic grating dense wave division multiplexer spare manufacture method according to claim 1 is characterized in that, when the tandem type body grating that is made into is used as the wave multiplexer spare of wavelength division multiplexing, is to use wavelength to be λ
iInput light along being coupled to some passage i perpendicular to the direction of body holographic recording medium (11) end face, bottom surface or side, the light of different wave length all converges from terminal surface D, becomes to close ripple output; When being used as the wave-dividing device of wavelength division multiplexing, will contain a plurality of use wavelength X
1, λ
2...., λ
i... input light along perpendicular to end face C direction input, its medium wavelength is λ
iLight will export by corresponding output face by i passage, become an angle of 90 degrees between input signal beam and the output beam.
5, stage linked body holographic grating dense wave division multiplexer spare manufacture method according to claim 1 and 2 is characterized in that in the different use wavelength X of record
iDuring pairing passage i, record angle 2 α that adopted
WiDetermine by following formula:
λ wherein
WBe recording wavelength, n
iBe that recording materials are at λ
iRefractive index, when using up when selling off lithium columbate crystal n as recording materials
iWith λ
iThe pass be:
T is an absolute temperature in the formula.
6, stage linked body holographic grating dense wave division multiplexer spare manufacture method according to claim 1 and 2, it is characterized in that the diffraction efficiency and the wavelength selectivity of volume holographic grating are optimized, be on the basis of common two-dimensional coupled-wave theory, the method that adopts the finite difference calculus direct integral to find the solution the coupling partial differential equation of binary is finished.
7, according to claim 1 or 6 described stage linked body holographic grating dense wave division multiplexer spare manufacture methods, it is characterized in that, carry out spatial light heterogeneous and wipe by adding mask, realize the spatial variations of refractive index modulation degree, can also can when record, adopt the recording light of space non-uniform Distribution to realize after the record grating is finished and before fixing.
8, stage linked body holographic grating dense wave division multiplexer spare manufacture method according to claim 1, it is characterized in that, use has the surface of the mask screen body holographic recording medium (11) of rectangular aperture, the crystalline region exposure that two-beam is only limited the square hole, and adjacent body grating is closely linked to each other and non-overlapping copies.
9, stage linked body holographic grating dense wave division multiplexer spare manufacture method according to claim 1 is characterized in that, the fixing means of holographic body grating can be a heat fixation, also can be photofixation; The heat fixation method of holographic grating can be disposable thermal fixing also can be heat fixation in batches, can be overall thermal fixing also can be the local heat fixation.
10, the dedicated system of stage linked body holographic grating dense wave division multiplexer spare manufacture method is characterised in that: include Optical devices, grating is carried out device that non-homogeneous light wipes and the optical transmission part that links to each other with body holographic recording medium (11); Wherein Optical devices comprise that the wavelength that sends is λ
WThe laser of light (7), λ
WLight is through forming the beam-expanding collimation device (8) of wide collimated light beam, be divided into beam intensity ratio be approximately 1: 1 two-beam and can the accurate beam splitting-bundling device system (9) that adjusts two beam angle, supporting mass holographic recording medium (11) and its translation direction become the linear translation platform (17) at 45 ° of angles with work top, linear translation platform (17) vertical fixing optics vibration isolation table (10) thereon; Grating is carried out the device that non-homogeneous light is wiped, comprise the cable (26) that is connected with computer (27), by the optical modulator (24) that cable (26) is connected with computer (27), optical modulator (24) is placed on the front near holographic recording medium (11); The optical transmission that links to each other with body holographic recording medium (11) partly comprises, by N wavelength (λ
1, λ
2...., λ
n) signal beams (18) and the input optical fibre (19) that links to each other with input optical fibre coupling element (20), with N corresponding, link to each other with N output optical fibre coupling element (21), the N output optical fibre (22) of wavelength, end face C direction perpendicular to body holographic recording medium (11) is set to: the corresponding output channel of output optical fibre, and become the rule of an angle of 90 degrees to be arranged on the end face of body holographic recording medium (11) according between input signal beam and the output beam.
11, the dedicated system of stage linked body holographic grating dense wave division multiplexer spare manufacture method according to claim 8, it is characterized in that beam splitting-bundling device system (9) comprises the laser beam (12) behind expansion bundle and the collimation, two speculums (14) through lens (13) incident, two speculums (15) that the two-beam that speculum (14) is next is assembled respectively, in body holographic recording medium (11), intersect, will be through two lens (16) of the two-beam collimation after speculum (15) reflection, lens (13) and speculum (14) are fixed on the same linear translation platform (28).
12, the dedicated system of stage linked body holographic grating dense wave division multiplexer spare manufacture method according to claim 8 is characterized in that having adopted to recording wavelength λ
WResponsive photorefractive crystal is perhaps to recording wavelength λ
WThe body holographic recording medium (11) of responsive isotropic body holographic storage material; The crystalline axis direction of this crystal should be parallel with the surface and with end face angle at 45, make grating vector parallel with crystallographic axis; Perhaps the crystalline axis direction of crystal should be along its length, make the angles that all become 45 degree towards the grating vector of the different directions of all direction diffraction with crystallographic axis.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101018098B (en) * | 2007-01-26 | 2010-09-29 | 西北工业大学 | Wave division multiplexer/demultiplexer and its making method |
| CN103765329A (en) * | 2011-06-06 | 2014-04-30 | 视瑞尔技术公司 | Method and device for the layered production of thin volume grid stacks, and beam combiner for a holographic display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5970190A (en) * | 1996-12-02 | 1999-10-19 | Photonics Research Ontario | Grating-in-etalon polarization insensitive wavelength division multiplexing devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101018098B (en) * | 2007-01-26 | 2010-09-29 | 西北工业大学 | Wave division multiplexer/demultiplexer and its making method |
| CN103765329A (en) * | 2011-06-06 | 2014-04-30 | 视瑞尔技术公司 | Method and device for the layered production of thin volume grid stacks, and beam combiner for a holographic display |
| CN105892057A (en) * | 2016-05-16 | 2016-08-24 | 中国民航大学 | Polymer multilayer film-based holographic color diffraction head-up display device |
| CN105892057B (en) * | 2016-05-16 | 2018-08-31 | 中国民航大学 | A kind of colored diffraction head-up display of holography based on polymer multilayer film |
| CN106599465A (en) * | 2016-12-13 | 2017-04-26 | 东南大学 | 1*N demultiplexer/multiplexer optimization method |
| CN106599465B (en) * | 2016-12-13 | 2020-04-24 | 东南大学 | Optimization method of 1 XN wave-splitting/wave-combining device |
| CN114690305A (en) * | 2017-10-04 | 2022-07-01 | 阿科尼亚全息有限责任公司 | Comb-shaped shifting skew mirror |
| CN108646331A (en) * | 2018-05-07 | 2018-10-12 | 浙江大学 | The exposure method and exposure stage of a kind of gradual change volume holographic grating using free-form surface lens |
| CN108646331B (en) * | 2018-05-07 | 2020-01-14 | 浙江大学 | Exposure method and exposure platform for gradient volume holographic grating using free-form surface lens |
| US11662511B2 (en) | 2020-07-22 | 2023-05-30 | Samsung Electronics Co., Ltd. | Beam expander and method of operating the same |
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