CN104950407A - BOSA (bi-directional optical sub-assembly) structure - Google Patents
BOSA (bi-directional optical sub-assembly) structure Download PDFInfo
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- CN104950407A CN104950407A CN201510376969.3A CN201510376969A CN104950407A CN 104950407 A CN104950407 A CN 104950407A CN 201510376969 A CN201510376969 A CN 201510376969A CN 104950407 A CN104950407 A CN 104950407A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
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Abstract
The invention discloses a BOSA (bi-directional optical sub-assembly) structure. The BOSA structure comprises a TOSA (transmitter optical sub-assembly) structure, an ROSA (receiver optical sub-assembly) structure and a light receiving and transmitting combined optical structure, wherein the TOSA structure comprises a light emission structure and a wavelength division multiplexing structure; the ROSA structure comprises a light receiving structure and a wavelength division multiplexing structure; an optical interface is arranged at one end of the BOSA structure, an optical signal received by the optical interface radiates the wavelength division multiplexing structure of the ROSA structure through the light receiving and transmitting combined optical structure, and signal light emitted by the TOSA structure is combined through the wavelength division multiplexing structure of the TOSA structure and then is transmitted to the optical interface through the light receiving and transmitting combined optical structure. The signal light emitted by the TOSA structure is output from the light interface. The structure is used for a four-channel high-speed receiving and transmitting system and performs uplink and downlink transmission on one optical fiber, the system structure is greatly simplified, the operation cost is reduced, and the transmission rate is increased.
Description
Technical field
The present invention relates to technical field of optical fiber communication, particularly relate to a kind of single fiber bi-directional BOSA structure for 4 passage high speed receive-transmit systems.
Growing along with communication field, traditional transmission technology has been difficult to the requirement meeting transmission capacity and speed, in typical application as fields such as data center, network connection, search engine, high-performance calculations, for improving the deficiency of broadband resource, common carrier and service suppliers dispose planning express network agreement of new generation, and this just needs corresponding high speed transceiver module to meet the data transportation requirements of high density two-forty.In information transmission system at a high speed, need to substitute traditional optical module with highdensity optical module, adopt multi-wavelength passage light transmit-receive technology, more transponder and receiver can be concentrated in less space and go, especially in the fiber solution of 40Gbps or 100Gbps, adopt the transmission technology of 4 wavelength channels, carry out data transmission with every path 10 Gbps or higher speed, its capacity can reach 4 times even higher of conventional one-channel transmission.And in such high speed transceiver module, namely its core component is BOSA structure in module.
Traditional BOSA structure is the discrete frame modes of employing two housings, one of them is TOSA transmitter module, another is ROSA receiver module, this will make the bulky of BOSA module, and causes the waste of resource, even if TOSA and ROSA is contained in same module, also two-way optical patchcord interface is needed to transmit and receive, if need transmit and receive a shared optical fiber, then need to access additional optical circulator, this turn increases the difficulty of operating cost and light path undoubtedly.
Summary of the invention
The object of the invention is to propose a kind of single fiber bi-directional BOSA structure for 4 wavelength channel high speed receive-transmit systems, directly on an optical fiber, carry out uplink and downlink transmission, without the need to external device or equipment, enormously simplify system architecture, reduce operation cost.
For achieving the above object, the technical scheme that the present invention proposes is: a kind of single fiber bi-directional BOSA structure, and comprise the transmitting-receiving of TOSA structure, ROSA structure and light and share optical texture three part-structure, described TOSA structure comprises again light emission structure and WDM structure; Described ROSA structure comprises again Wave Decomposition multiplexing structure and light-receiving structure; There is an optical interface described BOSA structure one end, and optical interface share optical texture from the light signal that outside single fiber receives through described light transmitting-receiving and incides the Wave Decomposition multiplexing structure of ROSA structure, then to light-receiving structure; The flashlight that described TOSA structure is launched, after its WDM structure closes light, share optical texture through described light transmitting-receiving and is transferred to optical interface, exports the flashlight of TOSA transmitting to outside single fiber by this optical interface.
Optical texture is share in light transmitting-receiving of the present invention, comprises the first birefringent polarizing analyzing crystal element successively, Faraday rotator assembly, the second birefringent polarizing analyzing crystal element.Described Faraday rotator assembly can be 45 ° of independent rotation angle Faraday rotation sheets, also can be the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate (Half Waveplate), the subassembly of 45 ° of rotation angle Faraday rotation sheets and 45 ° of rotation angle Faraday rotation sheets and half-wave plate all can do nonreciprocal rotation to two of a light mutually orthogonal linearly polarized light direction, the first and second described birefringent polarizing analyzing crystal elements, all processed by birefringent crystal material, there is specific optical axis direction and physical dimension, there is the effect of the linearly polarized light being divided into two bundles mutually orthogonal light, the element with this effect can be birefringece crystal angle of wedge sheet (Birefringent CrystalWedge), light beam deviator (PBD Polarization Beam Displacer), Wollaston (Wollaston) prism polarizers, two Wollaston prism (Double Wollaston prism) polarizer, Lip river breast (Rochon) prism, Niccol (Nicol) prism, Glan-Foucault prism (Glan-Foucault prism), Glan-Taylor prism (Glan-Taylor prism), Glan-Thompson prism (Glan-Thompson prism), Senarmont prism (Senarmont Prism) or promise MAERSK prism (Nomarski Prism), birefringent crystal material can be Yttrium Orthovanadate (YVO4) crystal, rutile (Rutile) crystal, lithium niobate (LiNbO3) crystal etc.Share in optical texture in same light transmitting-receiving, described in the present invention, the first birefringent polarizing analyzing crystal element is processed by identical birefringent crystal material with the second birefringent polarizing analyzing crystal element, and there is specific identical appearance size, especially, the angle that birefringent polarizing analyzing crystal element two ends lead to light face is the identical angle of wedge, claims this angle of wedge to be θ.
Further, collimated light beam is divided into the mutually orthogonal linearly polarized light of two bundle polarizations after inciding the axial first birefringent polarizing analyzing crystal element of specific light, and this two bunch polarized light can be parallel, also can be uneven; The orthogonal two bunch polarized lights in polarization direction are rotated by the nonreciprocity that Faraday rotator assembly subsequently does certain angle, the anglec of rotation of 45 ° of rotation angle Faraday rotation sheets is 45 °, and the anglec of rotation of the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate is 90 °; Bundle is closed in the above-mentioned orhtogonal linear polarizaiton light space separated by the axial second birefringent polarizing analyzing crystal element of specific light.During light reverse transfer, the second birefringent polarizing analyzing crystal element receives that space is separated and has two bundle orhtogonal linear polarizaiton light of certain degree, makes two bundle orhtogonal linear polarizaiton light be transported to Faraday rotator assembly after deviation respectively; Faraday rotator assembly does nonreciprocity to this reverse incident linearly polarized light and rotates, corresponding to forward entrance light, this backlight is through the rotation angle of 45 ° of rotation angle Faraday rotation sheets for being 45 °, and the rotation angle through the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate is 0 °; Last two beam reversal's transmission lights are closed bundle by the first birefringent polarizing analyzing crystal component space.The nonreciprocity of Faraday rotation sheet polarization optically-active, making the transmitting-receiving of described light share optical texture can first be divided into two bundle orhtogonal linear polarizaiton light to the light beam of forward transmission, then bundle is closed in space; Also bundle is closed to the cross line polarization light space that two bundle spaces of reverse transfer are separated simultaneously.During light reverse transfer, charge to penetrate the second birefringent polarizing analyzing crystal element two bundle spaces be separated orhtogonal linear polarizaiton light between the particular space angle of departure be β, when birefringent crystal material is determined, the size of β is relevant with the wedge angle that birefringent polarizing analyzing crystal element two ends lead to light face, and its relational expression is:
β＝2·arcsin[(ne-no)·tanθ]
Wherein, ne and no is extraordinary ray and the ordinary refraction index of birefringent polarizing analyzing crystal element respectively, and the span of wedge angle is the critical angle that total reflection occurs from 0 ° to θ c, θ c.Angle of departure β is larger, and the transmitting-receiving of described light is share optical texture and more easily obtained high forward and transmit isolation between reverse transfer light signal.The process that the forward transmission polarization spectro that optical texture is share in the transmitting-receiving of described light closes the process of bundle and reverse transfer polarization coupling is again only relevant with polarisation of light, and has nothing to do with wavelength, and described light transmitting-receiving share optical texture without wavelength selectivity.
The better scheme that optical texture is share in light transmitting-receiving of the present invention comprises the first light beam deviator successively, the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate, the second light beam deviator.In this programme, the incident light of two beam reversal's transmission and the emergent light of a branch of forward transmission are parallel to each other, and need the distance separately enough large in space, could obtain the high-isolation between forward transmission and reverse transfer light signal.
Another better scheme that optical texture is share in light transmitting-receiving of the present invention comprises the first birefringece crystal angle of wedge sheet successively, Faraday rotator assembly, the second birefringece crystal angle of wedge sheet.Described Faraday rotator assembly can be 45 ° of independent rotation angle Faraday rotation sheets, also can be the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate.In this programme, the angle of departure of reverse incident light can be larger, and the emergent light transmitted with forward also becomes larger angle, the emergent light of the incident light of reverse transfer and forward transmission, without the need to separating too large distance in space, just can obtain the high-isolation between forward transmission with reverse transfer light signal.
A better scheme of TOSA structure of the present invention is, the light emission structure of described TOSA structure comprises laser array and the collimation lens set of four different wave lengths; Described WDM structure comprises the first filtering diaphragm, the second filtering diaphragm, the 3rd filtering diaphragm and three completely reflecting mirrors; Described laser array launches the light signal of four different wave length λ 1, λ 2, λ 3, λ 4; Described first filtering diaphragm is anti-reflection high anti-to λ 2, λ 3 and λ 4 to λ 1; Described second filtering diaphragm is anti-reflection to λ 2, high anti-to λ 1, λ 3 and λ 4; Described 3rd filtering diaphragm is anti-reflection to λ 3, high anti-to λ 1, λ 2 and λ 4.
Laser array sends the linearly polarized light of High Extinction Ratio of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, after collimation lens set collimation, λ 1 is successively reflected by high reflective mirror, the second filtering diaphragm, with the 2-in-1 bundle of λ through the second filtering diaphragm, λ 1, λ 2 are successively reflected by high reflective mirror, the 3rd filtering diaphragm, close with the λ 3 through the 3rd filtering diaphragm and restraint, λ 1, λ 2, λ 3 are successively reflected by high reflective mirror, the 4th filtering diaphragm, close restraint with the λ 4 through the first filtering diaphragm.λ 1, λ 2, λ 3 and λ 4 finally close the linearly polarized light that the light restrainted is still High Extinction Ratio, and the conjunction bundle of this programme only only has a kind of linearly polarized light of polarization direction.Usually do not increasing in the element situation that can improve extinction ratio, quantum-well laser directly can meet the requirement of High Extinction Ratio linearly polarized light in the present invention program.
Another better scheme of TOSA structure of the present invention is that described TOSA structure is made up of two TOSA minor structures, and light emission structure comprises one group of the laser instrument subgroup of totally two groups of different wave lengths and collimation lens subgroup between two; Described WDM structure comprises two minor structures, is made up of respectively the second filtering diaphragm and completely reflecting mirror, the 4th filtering diaphragm and a completely reflecting mirror; Described two laser instrument subgroups comprise the light signal of four different wave length λ 1, λ 2, λ 3, λ 4 altogether; Described second filtering diaphragm is anti-reflection high anti-to λ 1, λ 3 and λ 4 to λ 2; Described 4th filtering diaphragm is anti-reflection to λ 4, high anti-to λ 1, λ 2 and λ 3.Two groups of more last schemes of this programme of this programme have used the 3rd filtering diaphragm and a completely reflecting mirror less.
Two laser instrument subgroups send the High Extinction Ratio linearly polarized light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, after collimation lens set collimation, λ 1 is successively reflected by high reflective mirror, the second filtering diaphragm, with the 2-in-1 bundle of λ through the second filtering diaphragm, the light of the 2-in-1 bundle of λ 1 and λ is still the linearly polarized light of High Extinction Ratio; λ 3 is successively reflected by high reflective mirror, the 4th filtering diaphragm, close with the λ 4 through the 4th filtering diaphragm and restraint, the light that λ 3 and λ 4 close bundle is still the linearly polarized light of High Extinction Ratio, and the conjunction bundle light of this programme two TOSA minor structures can be the mutually orthogonal two bunch polarized lights of two kinds of polarizations.Usually do not increasing in the element situation that can improve extinction ratio, quantum-well laser directly can meet the requirement of High Extinction Ratio linearly polarized light in the present invention program.
A better scheme of ROSA structure of the present invention is that the light-receiving structure of described ROSA structure comprises PD group and focus lens group; Described Wave Decomposition multiplexing structure comprises the first filtering diaphragm, the second filtering diaphragm, the 3rd filtering diaphragm, the 4th filtering diaphragm and three completely reflecting mirrors; Described first filtering diaphragm is anti-reflection high anti-to λ 2, λ 3 and λ 4 to λ 1; Described second filtering diaphragm is anti-reflection to λ 2, high anti-to λ 1, λ 3 and λ 4; Described 3rd filtering diaphragm is anti-reflection to λ 3, high anti-to λ 1, λ 2 and λ 4; Described 4th filtering diaphragm is anti-reflection to λ 4, high anti-to λ 1, λ 2 and λ 3.Receiving and dispatching by light the light signal share optical texture outgoing is directly incident on the 4th filtering diaphragm, wherein converges on PD corresponding to PD group by focus lens group after the direct transmission of λ 4; λ 1-λ 3 is reflexed on completely reflecting mirror by the 4th filtering diaphragm, reflexes on the 3rd filtering diaphragm through completely reflecting mirror, wherein, converges on PD corresponding to PD group after the direct transmission of λ 3 by focus lens group; λ 1 and λ 2 is reflexed on another completely reflecting mirror by the 3rd filtering diaphragm, reflexes on the second filtering diaphragm through this completely reflecting mirror, wherein, converges on PD corresponding to PD group after the direct transmission of λ 2 by focus lens group; λ 1 is reflexed on last completely reflecting mirror by the second filtering diaphragm, through the first filtering diaphragm after the reflection of this completely reflecting mirror, is converged on PD corresponding to PD group by focus lens group.
Light transmitting-receiving in described single fiber bi-directional BOSA structure share optical texture without wavelength selectivity, as long as increase or reduce the wavelength channel number of described TOSA structure and ROSA structure respectively, just can form the single fiber bi-directional BOSA structure that uplink and downlink wavelength channel number and wavelength channel kind are not limit, make described single fiber bi-directional BOSA structure have very strong dirigibility and adaptability.
Beneficial effect of the present invention is: utilize Faraday rotator and half-wave plate to realize the nonreciprocal conversion of outgoing and receiving beam polarization state, outgoing beam and receiving beam is made to produce the function that different trends realizes single fiber bi-directional on birefringent polarizing analyzing crystal element, drastically increase efficiency, save resource, and it is simple and compact for structure, easy to assembly, effectively reduce Insertion Loss, improve coupling efficiency, there is good temperature performance, be conducive to the long range propagation of light signal.
Accompanying drawing explanation
Fig. 1 .1, Fig. 1 .2, Fig. 1 .3 are birefringece crystal angle of wedge sheet schematic diagram
Fig. 2 is light beam deviator schematic diagram
Fig. 3 .1 is 22.5 ° of half-wave plate schematic diagram
Fig. 3 .2 is 45 ° of Faraday rotation sheet schematic diagram
Fig. 4 .1, Fig. 4 .2 are that Faraday rotator assembly rotates schematic diagram to light polarization direction
Fig. 5 .1, Fig. 5 .2 are that the light in BOSA structure receives and dispatches the structural representation and the index path that share one of optical texture
Fig. 6 .1, Fig. 6 .2 are that the light in BOSA structure receives and dispatches the structural representation and the index path that share optical texture two
Fig. 7 .1, Fig. 7 .2 are that the light in BOSA structure receives and dispatches the structural representation and the index path that share optical texture three
Fig. 8 is light emission structure in one of TOSA structure and WDM structure and light path schematic diagram
Fig. 9 .1, Fig. 9 .2 are minor structure and the light path schematic diagram of light emission structure in two of TOSA structure and WDM structure
Figure 10 is light-receiving structure in ROSA structure and Wave Decomposition multiplexing structure and light path schematic diagram
Figure 11 single fiber bi-directional BOSA constructive embodiment 1 schematic diagram
Figure 12 single fiber bi-directional BOSA constructive embodiment 2 schematic diagram
Figure 13 single fiber bi-directional BOSA constructive embodiment 3 schematic diagram
Figure 14 single fiber bi-directional BOSA constructive embodiment 4 schematic diagram
Accompanying drawing indicates: reference numerals identical in this instructions represents the identical element of optical texture, size and function and subassembly.
101-0 ° of birefringece crystal angle of wedge sheet, 103-90 ° of birefringece crystal angle of wedge sheet, 105-22.5 ° birefringece crystal angle of wedge sheet, 107-light beam deviator, 201-half-wave plate, 203-Faraday rotation sheet, 204-half-wave plate and Faraday rotation chip module, 002-four-way laser array, 004-four-way collimation lens set, 006-bis-passage laser array, 008-bis-passage collimation lens set, 010-bis-passage laser array, 014-four-way PD group, 016-four-way collimation lens set, 300-completely reflecting mirror, 301-first filtering diaphragm, 302-second filtering diaphragm, 303-the 3rd filtering diaphragm, 304-the 4th filtering diaphragm, 001-optical fiber, 003-collimation lens, 400-four-way TOSA structure, 501-bis-passage TOSA structon structure, 502-bis-passage TOSA structon structure, 600-four-way ROSA structure.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail:
Fig. 1 .1, Fig. 1 .2, Fig. 1 .3 are the birefringece crystal angle of wedge sheet schematic diagram of three kinds of different optical axis directions, the vertical x-y plane of birefringece crystal angle of wedge sheet 101 optical axis; The vertical x-z plane of birefringece crystal angle of wedge sheet 103 optical axis; The parallel y-z plane of birefringece crystal angle of wedge sheet 105 optical axis, becomes 22.5 ° of angles with z-axis.
Fig. 2 is light beam deviator schematic diagram, the parallel x-z plane of light beam deviator 107 optical axis, angled with z-axis.
Fig. 3 .1, Fig. 3 .2 are optical axis 22.5 ° of half-wave plates and 45 ° of Faraday rotation sheet schematic diagram, and the optical axis of zero-order half-wave sheet 201 becomes 22.5 ° of angles with z-axis; The rotation angle of Faraday rotation sheet 203 is 45 °.
Fig. 4 .1, Fig. 4 .2 are that 45 ° of Faraday rotation sheets and 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies rotate schematic diagram to the nonreciprocity of light polarization direction, and 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies 204 are bonded by 45 ° of Faraday rotation sheets 203 and optical axis 22.5 ° of half-wave plates 201.
After the linearly polarized light beam in electric field vector parallel z-axis direction passes 45 ° of Faraday rotation sheets 203 along y-axis forward, when observing along optical transmission direction, polarization direction has been rotated counterclockwise 45 °, electric field intensity direction is positioned at two of x-z coordinate plane, four-quadrant, angle at 45 ° with z-axis, when electric field intensity direction is positioned at two of x-z coordinate plane, four-quadrant, after passing 45 ° of Faraday rotation sheets 203 with the linearly polarized light at z-axis angle at 45 ° along y-axis negative sense, when observing along optical transmission direction, polarization direction has turned clockwise 45 °, polarization direction is vertical with z-axis, relatively aforesaid forward entrance polarisation of light direction, this polarization direction is also vertical.
After the linearly polarized light beam in electric field vector parallel z-axis direction passes 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies 204 along y-axis forward, when observing along optical transmission direction, polarization direction has been rotated counterclockwise 90 °, the parallel x-axis in electric field intensity direction, after the linearly polarized light of the parallel x-axis in electric field intensity direction passes 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies 204 along y-axis negative sense, when observing along optical transmission direction, polarization direction does not change, polarization direction is parallel with x-axis, relatively aforesaid forward entrance polarisation of light direction, this polarization direction is also vertical.
Fig. 5 .1, Fig. 5 .2 are that in the BOSA structure that forms of 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies and birefringece crystal angle of wedge sheet, light receives and dispatches the structural representation and index path of share optical texture.
The parallel z-axis of optical axis of the first birefringece crystal angle of wedge sheet 101, the parallel x-axis of optical axis of the second birefringece crystal angle of wedge sheet 103, at an angle of 90, Faraday rotator assembly is 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies 204 for the optical axis of the first birefringece crystal angle of wedge sheet 101 and the optical axis of the second birefringece crystal angle of wedge sheet 103.
Light beam is along y-axis forward entrance first birefringece crystal angle of wedge sheet 101, light beam is divided into two bundle orhtogonal linear polarizaiton light, polarization direction is the direction of optical axis direction along angle of wedge sheet and vertical optical axis, this two-beam forms an angle, extraordinary ray and ordinary light respectively, Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 are by two bundle polarized lights counter clockwise direction half-twist simultaneously subsequently, above-mentioned extraordinary ray is just parallel with the optical axis direction of the second birefringece crystal angle of wedge sheet 103 by Faraday rotation sheet and optical axis 22.5 ° of postrotational polarization faces of half-wave plate assembly 204, the polarization face of ordinary light is vertical with optical axis, the second last birefringece crystal angle of wedge sheet 103 by two bundle polarized lights cross union space close bundle.
Two bundle orhtogonal linear polarizaiton polarisation of light faces are parallel and vertical with the optical axis of the second birefringece crystal angle of wedge sheet 103 respectively, and two-beam is spatially separated from each other and becomes a certain degree, along the incident second birefringece crystal angle of wedge sheet 103 of y-axis negative sense, become extraordinary ray and the ordinary light of the second birefringece crystal angle of wedge sheet 103 respectively, sent to Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 by after the respective deviation of the second birefringece crystal angle of wedge sheet 103, Faraday rotation sheet subsequently and optical axis 22.5 ° of half-wave plate assemblies 204 are to two bundle polarized lights non rotating simultaneously, the polarization face of the extraordinary ray of above-mentioned second birefringece crystal angle of wedge sheet 103 is just vertical with the optical axis direction of the first birefringece crystal angle of wedge sheet 101, ordinary light plane of polarization is parallel with optical axis, last first birefringece crystal angle of wedge sheet 101 by two bundle spaces be separated polarized light cross union space close bundle.θ in figure is the angle of wedge of birefringece crystal angle of wedge sheet, and β is the space angle of departure of two oppositely incident bundle orhtogonal linear polarizaiton light.
Fig. 6 .1, Fig. 6 .2 are that the light in the BOSA structure of 45 ° of Faraday rotation sheets and birefringece crystal angle of wedge sheet formation receives and dispatches the structural representation and the index path that share optical texture.
The parallel x-z plane of optical axis of the first birefringece crystal angle of wedge sheet 105, direction is positioned at one, three quadrants, 22.5 ° of angles are pressed from both sides with z-axis, the parallel x-z plane of optical axis of the second birefringece crystal angle of wedge sheet 105, direction is positioned at two, four-quadrant, press from both sides 22.5 ° of angles with z-axis, the optical axis of the first birefringece crystal angle of wedge sheet 105 and the optical axis angle at 45 ° of the second birefringece crystal angle of wedge sheet 105, Faraday rotator assembly is 45 ° of Faraday rotation sheets 203.
Light beam is along y-axis forward entrance first birefringece crystal angle of wedge sheet 105, light beam is divided into two bundle orhtogonal linear polarizaiton light, polarization direction is the direction of optical axis direction along angle of wedge sheet and vertical optical axis, this two-beam becomes certain space to be separated angle, extraordinary ray and ordinary light respectively, two bundle polarized lights are counterclockwise rotated 45 ° by 45 ° of Faraday rotation sheets 203 simultaneously subsequently, above-mentioned extraordinary ray is just parallel with the optical axis direction of the second birefringece crystal angle of wedge sheet 105 by 45 ° of postrotational polarization faces of Faraday rotation sheet 203, also the extraordinary ray of the second birefringece crystal angle of wedge sheet 105 is become, ordinary light plane of polarization is vertical with optical axis, the second last birefringece crystal angle of wedge sheet 105 by two bundle spaces be separated polarized light cross union space close bundle.
The orhtogonal linear polarizaiton polarisation of light face that two bundle spaces are separated is parallel and vertical with the optical axis of the second birefringece crystal angle of wedge sheet 105 respectively, each other in the certain space angle of departure along the incident second birefringece crystal angle of wedge sheet 105 of y-axis negative sense, become extraordinary ray and the ordinary light of the second birefringece crystal angle of wedge sheet 105 respectively, sent to 45 ° of Faraday rotation sheets 203 by after the second birefringece crystal angle of wedge sheet 105 deviation, the clockwise direction while of two bundle polarized lights is rotated 45 ° by 45 ° of Faraday rotation sheets 203 subsequently, the extraordinary ray of above-mentioned second birefringece crystal angle of wedge sheet 105 is just vertical with the optical axis direction of the first birefringece crystal angle of wedge sheet 105 by the postrotational polarization face of Faraday rotator assembly 203, ordinary light plane of polarization is parallel with optical axis, last first birefringece crystal angle of wedge sheet 105 by two bundle spaces be separated polarized light cross union space close bundle.
Fig. 7 .1, Fig. 7 .2 are that the light in the BOSA structure that forms of 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies and light beam deviator receives and dispatches the structural representation and index path of share optical texture.
First light beam deviator 107 y-z plane parallel with the optical axis of the second light beam deviator 107 is also in one, three quadrants, and Faraday rotator assembly is 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies 204.
Along y-axis forward entrance first light beam deviator 107, light beam is divided into two bundle orhtogonal linear polarizaiton light, polarization direction is that other places are in y-z face and vertical y-z face, this two-beam forms an angle, extraordinary ray and ordinary light respectively, Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 are by two bundle polarized lights counter clockwise direction half-twist simultaneously subsequently, the extraordinary ray of above-mentioned first light beam deviator 107 is just vertical with the optical axis of the second light beam deviator 107 by the polarization face after Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assembly 204 half-twists, the plane of polarization of ordinary light is parallel with optical axis, the second last light beam deviator 107 by two bundle polarized lights cross union space close bundle.
Two bundle orhtogonal linear polarizaiton polarisation of light faces are parallel and vertical with the optical axis of the second light beam deviator 107 respectively, parallel each other and at a distance of a determining deviation, along the incident second light beam deviator 107 of y-axis negative sense, become extraordinary ray and the ordinary light of the second light beam deviator 107 respectively, reduced spacing by the second light beam deviator 107 and parallelly send Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 to, Faraday rotation sheet subsequently and optical axis 22.5 ° of half-wave plate assemblies 204 to two bundle polarized lights without spin simultaneously, the polarization face of the extraordinary ray of above-mentioned second light beam deviator 107 is just parallel with the optical axis of the first light beam deviator 107, become the extraordinary ray of the first light beam deviator 107, ordinary light plane of polarization is vertical with the optical axis optical axis of the first light beam deviator 107, last first light beam deviator 107 by two bundle polarized lights cross union space close bundle.Fig. 8 is light emission structure in one of TOSA structure and WDM structure and light path schematic diagram.
The light emission structure of one of described TOSA structure 400 comprises laser array 002 and the collimation lens set 004 of four different wave lengths; Described WDM structure comprises the second filtering diaphragm 302, the 3rd filtering diaphragm 303, the 4th filtering diaphragm 304 and three completely reflecting mirrors 300; Described light emission structure comprises the light signal of four different wave length λ 1, λ 2, λ 3, λ 4; It is high anti-to λ 1, λ 3 and λ 4 that described second filtering diaphragm 302 couples of λ 2 are anti-reflection; ; Described 3rd filtering diaphragm is anti-reflection to λ 3, high anti-to λ 1, λ 2 and λ 4; Described 4th filtering diaphragm is anti-reflection to λ 4, high anti-to λ 1, λ 2 and λ 3.
Laser array 002 sends the linearly polarized light of High Extinction Ratio of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, after collimation lens set 004 collimates, λ 1 is successively reflected by high reflective mirror 300, second filtering diaphragm 302, with the 2-in-1 bundle of λ through the second filtering diaphragm 302, λ 1, λ 2 are successively reflected by high reflective mirror 300, the 3rd filtering diaphragm 303, close with the λ 3 through the 3rd filtering diaphragm 303 and restraint, λ 1, λ 2, λ 3 are successively reflected by high reflective mirror 300, the 4th filtering diaphragm 304, close restraint with the λ 4 through the 4th filtering diaphragm 304.Light λ 1, the λ 2 of final conjunction bundle, λ 3 and λ 4 are still the linearly polarized lights of High Extinction Ratio.
Fig. 9 .1, Fig. 9 .2 are minor structure and the light path schematic diagram of light emission structure in two of TOSA structure and WDM structure, described TOSA structure two by two light emission structures arranged side by side and WDM structure one of minor structure and two to form.
The light emission structure minor structure 501 of one of described light emission structure and WDM structure minor structure comprises a laser instrument subgroup 006 and a collimation lens subgroup 008; Described WDM structure minor structure comprises the second filtering diaphragm 302 and a completely reflecting mirror 300; Described Laser emission subgroup 006 comprises the light signal of two different wave length λ 1, λ 2 altogether; Described second filtering diaphragm 302 couples of λ 2 are anti-reflection to λ 1, λ 3, λ 4 height instead.
Laser instrument subgroup 006 sends the High Extinction Ratio linearly polarized light of λ 1 and λ 2 two different wave lengths, after collimation lens subgroup 008 collimates, λ 1 is successively reflected by high reflective mirror 300, second filtering diaphragm 302, with the 2-in-1 bundle of λ through the second filtering diaphragm 302, the light λ 1 of final conjunction bundle and λ 2 is still the linearly polarized light of High Extinction Ratio.
The light emission structure minor structure 502 of described light emission structure and WDM structure minor structure two comprises a laser instrument subgroup 010 and a collimation lens subgroup 008; Described WDM structure minor structure comprises the 4th filtering diaphragm 304 and a completely reflecting mirror 300; Described Laser emission subgroup 010 comprises the light signal of two different wave length λ 3, λ 4 altogether; Described 4th filtering diaphragm 304 couples of λ 4 are anti-reflection to λ 1, λ 2, λ 3 height instead.
Laser instrument subgroup 010 sends the High Extinction Ratio linearly polarized light of λ 3 and λ 4 two different wave lengths, after collimation lens subgroup 008 collimates, λ 3 is successively reflected by high reflective mirror 300, the 4th filtering diaphragm 304, close with the λ 4 through the 4th filtering diaphragm 304 and restraint, the light λ 3 of final conjunction bundle and λ 4 is still the linearly polarized light of High Extinction Ratio.
Figure 10 is light-receiving structure in ROSA structure and Wave Decomposition multiplexing structure and light path schematic diagram
The light-receiving structure of ROSA structure 600 of the present invention comprises PD group 014 and focus lens group 016; Described Wave Decomposition multiplexing structure comprises the first filtering diaphragm 301, second filtering diaphragm 302, the 3rd filtering diaphragm the 303, four filtering diaphragm 304 and three completely reflecting mirrors 300; It is high anti-to λ 2-λ 4 that described first filtering diaphragm 301 couples of λ 1 are anti-reflection; 302 couples of λ 2 are anti-reflection for described second filtering diaphragm, high anti-to λ 1, λ 2 and λ 3; 303 couples of λ 3 are anti-reflection for described 3rd filtering diaphragm, high anti-to λ 1, λ 2 and λ 4; 304 couples of λ 4 are anti-reflection for described 4th filtering diaphragm, high anti-to λ 1, λ 2 and λ 3.Receiving and dispatching by light the light signal share optical texture outgoing is directly incident on the 4th filtering diaphragm 304, wherein converges on the PD of PD group 014 correspondence by focus lens group 016 after the direct transmission of λ 4; λ 1-λ 3 is reflexed on completely reflecting mirror 300 by the 4th filtering diaphragm 304, reflexes on the 3rd filtering diaphragm 303 through completely reflecting mirror 300, wherein, converges on the PD of PD group 014 correspondence after the direct transmission of λ 3 by focus lens group 016; λ 1 and λ 2 is reflexed on another completely reflecting mirror 300 by the 3rd filtering diaphragm 303, reflexes on the second filtering diaphragm 302 through this completely reflecting mirror 300, wherein, converges on the PD of PD group 014 correspondence after the direct transmission of λ 2 by focus lens group 016; λ 1 is reflexed on another completely reflecting mirror 300 by the second filtering diaphragm 302, reflexes on the first filtering diaphragm 301 through this completely reflecting mirror 300, is converged on the PD of PD group 014 correspondence after the direct transmission of λ 1 by focus lens group 016.
[embodiment 1]
In Figure 11, BOSA structure comprises input optical fibre 001 and collimation lens 003, first birefringece crystal angle of wedge sheet 101,45 ° of Faraday rotation sheets thereof and optical axis 22.5 ° of half-wave plate assemblies 204, second birefringece crystal angle of wedge sheet 103 and arranged side by side 2 passage TOSA minor structure 501,2 passage TOSA minor structure 502 and 4 passage ROSA structures 600 successively.
The parallel z-axis of optical axis of the first birefringece crystal angle of wedge sheet 101, the parallel x-axis of optical axis of the second birefringece crystal angle of wedge sheet 103, at an angle of 90, Faraday rotator assembly is 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies 204 for the optical axis of the first birefringece crystal angle of wedge sheet 101 and the optical axis of the second birefringece crystal angle of wedge sheet 103.
The multi-wavelength diverging light of optical fiber 001 outgoing collimates through collimation lens 003, along y-axis forward entrance first birefringece crystal angle of wedge sheet 101, light beam is divided into two bundle orhtogonal linear polarizaiton light, polarization direction is the direction of optical axis direction along angle of wedge sheet 101 and vertical optical axis, this two-beam forms an angle, extraordinary ray and ordinary light respectively, Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 are by two bundle polarized lights counter clockwise direction half-twist simultaneously subsequently, above-mentioned extraordinary ray is just consistent with the optical axis direction of the second birefringece crystal angle of wedge sheet 103 by Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assembly 204 postrotational polarization directions, become the second birefringece crystal angle of wedge sheet 103 extraordinary ray, ordinary light is vertical with the optical axis of the second birefringece crystal angle of wedge sheet 103, the second last birefringece crystal angle of wedge sheet 103 by two bundle polarized lights cross union space close bundle, close the ROSA structure 600 of incident 4 passages of the light after bundle, after the light wave decomposition multiplex of the λ 1 in incident light, λ 2, λ 3 and λ 4 wavelength, enter corresponding PD, be converted into corresponding electric signal, complete the light signal receiving function of BOSA structure.
Make peace vertical with the optical axis one of the second birefringece crystal angle of wedge sheet 103 by TOSA minor structure 501 respectively with the direction of the two bundle orhtogonal linear polarizaiton light that TOSA minor structure 502 sends, form an angle along the incident second birefringece crystal angle of wedge sheet 103 of y-axis negative sense each other, become extraordinary ray and the ordinary light of the second birefringece crystal angle of wedge sheet 103 respectively, sent to Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 by after the second birefringece crystal angle of wedge sheet 103 deviation, Faraday rotation sheet subsequently and optical axis 22.5 ° of half-wave plate assemblies 204 are to two bundle polarized lights non rotating simultaneously, the plane of polarization of the extraordinary ray of above-mentioned second birefringece crystal angle of wedge sheet 103 is just vertical with the optical axis direction of the first birefringece crystal angle of wedge sheet 101, ordinary light plane of polarization is parallel with the optical axis of the first birefringece crystal angle of wedge sheet 101, last first birefringece crystal angle of wedge sheet 101 by two bundle polarized lights cross union space close bundle, optical fiber 001 is coupled to eventually through collimation lens 003, complete the optical signal launch function of BOSA structure.
[embodiment 2]
In Figure 12, BOSA structure comprises input optical fibre 001 and collimation lens 003, first birefringece crystal angle of wedge sheet 105,45 ° of Faraday rotation sheet 203, second birefringece crystal angle of wedge sheets 105 thereof and arranged side by side 2 passage TOSA minor structure 501,2 passage TOSA minor structure 502 and 4 passage ROSA structures 600 successively.
The parallel x-z plane of optical axis of the first birefringece crystal angle of wedge sheet 105, direction is positioned at one, three quadrants, 22.5 ° of angles are pressed from both sides with z-axis, the parallel x-z plane of optical axis of the second birefringece crystal angle of wedge sheet 105, direction is positioned at two, four-quadrant, press from both sides 22.5 ° of angles with z-axis, the optical axis of the first birefringece crystal angle of wedge sheet 105 and the optical axis angle at 45 ° of the second birefringece crystal angle of wedge sheet 105, Faraday rotator assembly is 45 ° of Faraday rotation sheets 203.
The multi-wavelength diverging light of optical fiber 001 outgoing collimates through collimation lens 003, along y-axis forward entrance first birefringece crystal angle of wedge sheet 105, light beam is divided into two bundle orhtogonal linear polarizaiton light, polarization direction is the direction of optical axis direction along angle of wedge sheet 105 and vertical optical axis, this two-beam forms an angle, extraordinary ray and ordinary light respectively, two bundle polarized lights are counterclockwise rotated 45 ° by 45 ° of Faraday rotation sheets 203 simultaneously subsequently, above-mentioned extraordinary ray is just parallel with the optical axis direction of the second birefringece crystal angle of wedge sheet 105 by 45 ° of postrotational polarization faces of Faraday rotation sheet 203, ordinary light is vertical with the optical axis of the second birefringece crystal angle of wedge sheet 105, the second last birefringece crystal angle of wedge sheet 105 by two bundle polarized lights cross union space close bundle.Close the ROSA structure 600 of incident 4 passages of the light after bundle, after the light wave decomposition multiplex of the λ 1 in incident light, λ 2, λ 3 and λ 4 wavelength, enter corresponding PD, be converted into corresponding electric signal, complete the light signal receiving function of BOSA structure.
Make peace vertical with the optical axis one of the second birefringece crystal angle of wedge sheet 105 by TOSA minor structure 501 respectively with the direction of the two bundle orhtogonal linear polarizaiton light that TOSA minor structure 502 sends, form an angle along the incident second birefringece crystal angle of wedge sheet 105 of y-axis negative sense each other, become extraordinary ray and the ordinary light of the second birefringece crystal angle of wedge sheet 105 respectively, 45 ° of Faraday rotation sheets 203 are sent to after being reduced angle by the second birefringece crystal angle of wedge sheet 105, the clockwise direction while of two bundle polarized lights is rotated 45 ° by 45 ° of Faraday rotation sheets 203 subsequently, the extraordinary ray of above-mentioned second birefringece crystal angle of wedge sheet 105 is just parallel with the optical axis direction of the first birefringece crystal angle of wedge sheet 105 by 45 ° of postrotational polarization faces of Faraday rotation sheet 203, ordinary light plane of polarization is parallel with the optical axis of the first birefringece crystal angle of wedge sheet 105, last first birefringece crystal angle of wedge sheet 105 by two bundle polarized lights cross union space close bundle.Be coupled to optical fiber 001 eventually through collimation lens 003, complete the optical signal launch function of BOSA structure.
[embodiment 3]
In Figure 13, BOSA structure comprises input optical fibre 001 and collimation lens 003, first light beam deviator 107,45 ° of Faraday rotation sheets thereof and optical axis 22.5 ° of half-wave plate assemblies 204, second light beam deviator 107 and arranged side by side 4 passage TOSA structure 400 and 4 passage ROSA structures 600 successively.
First light beam deviator 107 y-z plane parallel with the optical axis of the second light beam deviator 107 is also in one, three quadrants, and Faraday rotator assembly is 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies 204.
The multi-wavelength diverging light of optical fiber 001 outgoing collimates through collimation lens 003, along y-axis forward entrance first light beam deviator 107, light beam is divided into two bundle orhtogonal linear polarizaiton light, polarization direction is that other places are in y-z face and vertical y-z face, this two-beam forms an angle, extraordinary ray and ordinary light respectively, Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 are by two bundle polarized lights counter clockwise direction half-twist simultaneously subsequently, the extraordinary ray of above-mentioned first light beam deviator 107 is just vertical with the optical axis of the second light beam deviator 107 by the polarization face after Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assembly 204 half-twists, the plane of polarization of ordinary light is parallel with the optical axis of the second light beam deviator 107, the second last light beam deviator 107 by two bundle polarized lights cross union space close bundle.Close the ROSA structure 600 of incident 4 passages of the light after bundle, after the light wave decomposition multiplex of the λ 1 in incident light, λ 2, λ 3 and λ 4 wavelength, enter corresponding PD, be converted into corresponding electric signal, complete the light signal receiving function of BOSA structure.
The direction of a branch of linearly polarized light sent by 4 passage TOSA structures 400 is vertical with the optical axis of the second light beam deviator 107, parallel with y-axis and at a distance of a determining deviation, along the incident second light beam deviator 107 of y-axis negative sense, become the ordinary light of the second light beam deviator 107, straight-line pass second light beam deviator 107, and send Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 to, Faraday rotation sheet subsequently and optical axis 22.5 ° of half-wave plate assemblies 204 do not do this bundle polarized light and rotate, the ordinary light plane of polarization of above-mentioned second light beam deviator 107 is just vertical with the optical axis of the first light beam deviator 000, also be the ordinary light of the first light beam deviator 107, straight-line pass first light beam deviator 107, optical fiber 001 is coupled to by collimation lens 003, thus complete the optical signal launch function of BOSA structure.
[embodiment 4]
In Figure 14, BOSA structure comprises input optical fibre 001 and collimation lens 003, first light beam deviator 107,45 ° of Faraday rotation sheets thereof and optical axis 22.5 ° of half-wave plate assemblies 204, second light beam deviator 107 and arranged side by side 2 passage TOSA minor structure 501,2 passage TOSA minor structure 502 and 4 passage ROSA structures 600 successively.
First light beam deviator 107 y-z plane parallel with the optical axis of the second light beam deviator 107 is also in one, three quadrants, and Faraday rotator assembly is 45 ° of Faraday rotation sheets and optical axis 22.5 ° of half-wave plate assemblies 204.
The multi-wavelength diverging light of optical fiber 001 outgoing collimates through collimation lens 003, along y-axis forward entrance first light beam deviator 107, light beam is divided into two bundle orhtogonal linear polarizaiton light, polarization direction is that other places are in y-z face and vertical y-z face, this two-beam forms an angle, extraordinary ray and ordinary light respectively, Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 are by two bundle polarized lights counter clockwise direction half-twist simultaneously subsequently, the extraordinary ray of above-mentioned first light beam deviator 107 is just vertical with the optical axis of the second light beam deviator 107 by the inclined frontal after Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assembly 204 half-twists, become the ordinary light of the second light beam deviator 107, the plane of polarization of ordinary light is parallel with the optical axis of the second light beam deviator 107, become the extraordinary ray of the second light beam deviator 107, the second last light beam deviator 107 by two bundle polarized lights cross union space close bundle.Close the ROSA structure 600 of incident 4 passages of the light after bundle, after the light wave decomposition multiplex of the λ 1 in incident light, λ 2, λ 3 and λ 4 wavelength, enter corresponding PD, be converted into corresponding electric signal, complete the light signal receiving function of BOSA structure.
Parallel and vertical with the optical axis of the second light beam deviator 107 respectively with the direction of the two bundle orhtogonal linear polarizaiton light that TOSA minor structure 502 sends by TOSA minor structure 501, parallel each other and at a distance of a determining deviation, along the incident second light beam deviator 107 of y-axis negative sense, become extraordinary ray and the ordinary light of the second light beam deviator 107 respectively, reduced spacing by the second light beam deviator 107 and parallelly send Faraday rotation sheet and optical axis 22.5 ° of half-wave plate assemblies 204 to, Faraday rotation sheet subsequently and optical axis 22.5 ° of half-wave plate assemblies 204 are to two bundle polarized lights non rotating simultaneously, the polarization face of the extraordinary ray of above-mentioned second light beam deviator 204 is just parallel with the optical axis of the first light beam deviator 107, ordinary light plane of polarization is vertical with the optical axis of the first light beam deviator 107, last first light beam deviator 107 by two bundle polarized lights cross union space close bundle.Be coupled to optical fiber 001 eventually through collimation lens 003, complete the optical signal launch function of BOSA structure.
Claims (8)
1. a single fiber bi-directional BOSA structure, comprises TOSA structure and ROSA structure, and described TOSA structure comprises light emission structure and WDM structure; Described ROSA structure comprises light-receiving structure and Wave Decomposition multiplexing structure; It is characterized in that: also comprise a light transmitting-receiving and share optical texture; Described BOSA one end is provided with an optical interface, and the light signal that optical interface receives share optical texture through described light transmitting-receiving and incides on the Wave Decomposition multiplexing structure of ROSA; The flashlight that described TOSA launches, after its WDM structure closes light, share optical texture through described light transmitting-receiving and is transferred to described optical interface, exported the flashlight of TOSA transmitting by this optical interface.
2. single fiber bi-directional BOSA structure as claimed in claim 1, is characterized in that: described light transmitting-receiving is share optical texture and comprised the first birefringent polarizing analyzing crystal element successively, Faraday rotator assembly, the second birefringent polarizing analyzing crystal element.Described Faraday rotator assembly can be 45 ° of independent rotation angle Faraday rotation sheets, also can be the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate; The first described birefringent polarizing analyzing crystal element and the second birefringent polarizing analyzing crystal element are the optical elements that the geomery that processes with identical birefringent crystal material is identical, can be birefringece crystal angle of wedge sheet, also can be light beam deviator.When using 45 ° of rotation angle Faraday rotation sheets, the mutual angle at 45 ° of optical axis of the first birefringece crystal angle of wedge sheet and the second birefringece crystal angle of wedge sheet; When using the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate, the mutual angle in 90 ° of optical axis of the first birefringece crystal angle of wedge sheet and the second birefringece crystal angle of wedge sheet; When using the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate, the first light beam deviator is parallel with the optical axis of the second light beam deviator.Described light transmitting-receiving share optical texture to the forward transmitting beam elder generation cross polarization beam splitting from the first birefringent polarizing analyzing crystal element incidence, and rear space closes bundle, then bundle is closed space to the cross line polarization light that two bundle spaces of the reverse transfer from the second birefringent polarizing analyzing crystal element incidence are separated, the size of the space angle of departure β of reverse incident light is relevant with the wedge angle that birefringent polarizing analyzing crystal element two ends lead to light face, β=2arcsin [(ne-no) tan θ], wherein, ne and no is extraordinary ray and the ordinary refraction index of birefringent polarizing analyzing crystal element respectively, the span of wedge angle is from 0 ° to θ c, θ c is the critical angle that total reflection occurs, the angle of departure is that β is larger, the transmitting-receiving of described light is share optical texture and is more easily obtained high forward and transmit isolation between reverse transfer light signal.
3. single fiber bi-directional BOSA structure as claimed in claim 1 or 2, it is characterized in that: the process that the forward transmission polarization spectro that optical texture is share in the transmitting-receiving of described light closes the process of bundle and reverse transfer polarization coupling is again only relevant with polarisation of light, and have nothing to do with wavelength, described light transmitting-receiving share optical texture without wavelength selectivity.
4. single fiber bi-directional BOSA structure as claimed in claim 1 or 2, is characterized in that: it is comprise the first light beam deviator successively that optical texture is share in described light transmitting-receiving, the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate, the second light beam deviator.
5. single fiber bi-directional BOSA structure as claimed in claim 1 or 2, is characterized in that: it is comprise the first birefringece crystal angle of wedge sheet successively, Faraday rotator assembly that optical texture is share in described light transmitting-receiving, the second birefringece crystal angle of wedge sheet; Described Faraday rotator assembly is 45 ° of independent rotation angle Faraday rotation sheets, or the subassembly of 45 ° of rotation angle Faraday rotation sheets and half-wave plate.
6. single fiber bi-directional BOSA structure as claimed in claim 1, is characterized in that: the light emission structure of described TOSA structure comprises laser array and the collimation lens set of four different wave lengths; Described WDM structure comprises the first filtering diaphragm, the second filtering diaphragm, the 3rd filtering diaphragm and three completely reflecting mirrors; Described laser array launches the light signal of four different wave length λ 1, λ 2, λ 3, λ 4; Described first filtering diaphragm is anti-reflection high anti-to λ 2, λ 3 and λ 4 to λ 1; Described second filtering diaphragm is anti-reflection to λ 2, high anti-to λ 1, λ 3 and λ 4; Described 3rd filtering diaphragm is anti-reflection to λ 3, high anti-to λ 1, λ 2 and λ 4; Close the linearly polarized light that bundle only only has a kind of polarization direction; The another kind of structure of described TOSA structure is made up of two TOSA minor structures, and light emission structure comprises one group of the laser instrument subgroup of totally two groups of different wave lengths and collimation lens subgroup between two; Described WDM structure comprises two minor structures, is made up of respectively the second filtering diaphragm and completely reflecting mirror, the 4th filtering diaphragm and a completely reflecting mirror; Described two laser instrument subgroups comprise the light signal of four different wave length λ 1, λ 2, λ 3, λ 4 altogether; Described second filtering diaphragm is anti-reflection high anti-to λ 1, λ 3 and λ 4 to λ 2; Described 4th filtering diaphragm is anti-reflection to λ 4, high anti-to λ 1, λ 2 and λ 3; The linearly polarized light of conjunction Shu Guangwei two polarized orthogonals of two minor structures.
7. single fiber bi-directional BOSA structure as claimed in claim 1, is characterized in that: the light-receiving structure of described ROSA structure comprises PD group and focus lens group; Described Wave Decomposition multiplexing structure comprises the first filtering diaphragm, the second filtering diaphragm, the 3rd filtering diaphragm, the 4th filtering diaphragm and three completely reflecting mirrors; Described first filtering diaphragm is anti-reflection high anti-to λ 2, λ 3 and λ 4 to λ 1; Described second filtering diaphragm is anti-reflection to λ 2, high anti-to λ 1, λ 3 and λ 4; Described 3rd filtering diaphragm is anti-reflection to λ 3, high anti-to λ 1, λ 2 and λ 4; Described 4th filtering diaphragm is anti-reflection to λ 4, high anti-to λ 1, λ 2 and λ 3; Receiving and dispatching by light the light signal share optical texture outgoing is directly incident on the 4th filtering diaphragm, wherein converges on PD corresponding to PD group by focus lens group after the direct transmission of λ 4; λ 1-λ 3 is reflexed on completely reflecting mirror by the 4th filtering diaphragm, reflexes on the 3rd filtering diaphragm through completely reflecting mirror, wherein, converges on PD corresponding to PD group after the direct transmission of λ 3 by focus lens group; λ 1 and λ 2 is reflexed on another completely reflecting mirror by the 3rd filtering diaphragm, reflexes on the second filtering diaphragm through this completely reflecting mirror, wherein, converges on PD corresponding to PD group after the direct transmission of λ 2 by focus lens group; λ 1 is reflexed on last completely reflecting mirror by the second filtering diaphragm, through the first filtering diaphragm after the reflection of this completely reflecting mirror, is converged on PD corresponding to PD group by focus lens group.
8. single fiber bi-directional BOSA structure as claimed in claim 1, it is characterized in that: the light transmitting-receiving in described single fiber bi-directional BOSA structure share optical texture without wavelength selectivity, as long as increase or reduce the wavelength channel number of described TOSA structure and ROSA structure respectively, just can form the single fiber bi-directional BOSA structure that uplink and downlink wavelength channel number and wavelength channel kind are not limit, make described single fiber bi-directional BOSA structure have very strong dirigibility and adaptability.
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| WO2021057291A1 (en) * | 2019-09-26 | 2021-04-01 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN112558238A (en) * | 2019-09-26 | 2021-03-26 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN112698450A (en) * | 2019-10-22 | 2021-04-23 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN112698450B (en) * | 2019-10-22 | 2023-03-24 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN113267851A (en) * | 2019-12-23 | 2021-08-17 | 讯芸电子科技(中山)有限公司 | Optical communication module |
| US11366271B2 (en) | 2019-12-23 | 2022-06-21 | Shunyun Technology (Zhong Shan) Limited | Optical communication module of reduced size utilizing one birefringent crystal to separate light signals |
| CN112198592A (en) * | 2020-09-03 | 2021-01-08 | 武汉光迅科技股份有限公司 | Optical system |
| CN112198592B (en) * | 2020-09-03 | 2023-09-05 | 武汉光迅科技股份有限公司 | Optical system |
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