CN104459904A - Single-fiber bidirectional BOSA structure - Google Patents
Single-fiber bidirectional BOSA structure Download PDFInfo
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- CN104459904A CN104459904A CN201310424754.5A CN201310424754A CN104459904A CN 104459904 A CN104459904 A CN 104459904A CN 201310424754 A CN201310424754 A CN 201310424754A CN 104459904 A CN104459904 A CN 104459904A
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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
- G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
- G02B6/4208—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback using non-reciprocal elements or birefringent plates, i.e. quasi-isolators
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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
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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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
- G02B6/26—Optical coupling means
- G02B6/34—Optical coupling means utilising prism or grating
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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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- 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
- G02B6/4213—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being polarisation selective optical elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
Abstract
The invention discloses a single-fiber bidirectional BOSA structure. The single-fiber bidirectional BOSA structure comprises a packaging housing, a TOSA, an ROSA, and a light transmit-receive integrated optical structure. The TOSA comprises a light emitting group and a wavelength division multiplexing structure, and the ROSA comprises a light receiving group and a wavelength division de-multiplexing structure; one end of the housing is provided with an optical interface, and optical signals received by the optical interface are emitted to the wavelength division de-multiplexing structure of the ROSA through the light transmit-receive integrated optical structure; signal light emitted by the TOSA, after light combination through the wavelength division multiplexing structure, is transmitted to the optical interface through the light transmit-receive integrated optical structure, and the optical interface outputs the signal light emitted by the TOSA; and the TOSA, the ROSA and the light transmit-receive integrated optical structure are packaged in the housing. According to the invention, the structure is used for a four-channel high-speed transmit-receive system, uplink and downlink transmission is carried out directly on one fiber, external devices or equipment is unnecessary, the system structure is greatly simplified, the operation cost is decreased, the assembling is convenient, the insertion loss is effectively reduced, the coupling efficiency is enhanced, the temperature performance is good, and long-distance transmission of the optical signals is facilitated.
Description
Technical field
The present invention relates to technical field of optical fiber communication, particularly relate to a kind of light single fiber bi-directional BOSA structure for 4 passage high speed receive-transmit systems.
Background technology
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 preventing 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 multichannel 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 passages, 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 optical patchcord interfaces are needed to transmit and receive, if need transmit and receive a shared optical fiber, then need to access additional 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 passage 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 encapsulating housing, TOSA and ROSA, described TOSA comprises light transmitting group and WDM structure; Described ROSA comprises light-receiving group and Wave Decomposition multiplexing structure; Also comprise a light transmitting-receiving and share optical texture; Described shell 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; Described TOSA, ROSA and light transmitting-receiving are share optical texture and are packaged in housing.
Further, described light transmitting-receiving is share optical texture and is comprised the first polarization splitting prism, Faraday rotator, half wave plate group and the second polarization splitting prism that arrange according to light path, and is located at the conjunction photon structure between the Wave Decomposition multiplexing structure of ROSA and the first polarization splitting prism, described first polarization splitting prism and the second polarization splitting prism include two oblique 45 ° of polarization spectro faces be arranged in parallel, and two polarization splitting prisms are vertically arranged mutually, on the WDM structure output light path that two polarization spectro faces of described first polarization splitting prism lay respectively at TOSA and on the input light path of ROSA Wave Decomposition multiplexing structure, described half wave plate group comprises half-wave plate and lower half-wave plate, lays respectively in light path corresponding to the second polarization splitting prism two polarization beam splitter faces, described half wave plate group and Faraday rotator combine, together by by the light polarization direction half-twist of half wave plate group and Faraday rotator or 0 °, S light and P light two-route wire polarized light is divided into through the second polarization splitting prism by the flashlight of described optical interface incidence, two-route wire polarized light is respectively through upper half-wave plate and lower half-wave plate, again by after Faraday rotator, two linearly polarized lights are all become P light by rotation and close photon structure by incident after the first polarization splitting prism two secondary reflection, ECDC photon structure is combined into light beam and incides in the Wave Decomposition multiplexing structure of ROSA, and the linearly polarized light that the WDM structure of TOSA exports is directly transmitted through inciding Faraday rotator after the first polarization splitting prism, exported by described optical interface after half wave plate group and the second polarization splitting prism, or two linearly polarized light directly incide conjunction photon structure transmitted through after the first polarization splitting prism through all becoming S light after Faraday rotator, ECDC photon structure is combined into light beam and incides in the Wave Decomposition multiplexing structure of ROSA, the linearly polarized light that the WDM structure of described TOSA exports incides Faraday rotator after two secondary reflections of the first polarization splitting prism, is exported after half wave plate group and the second polarization splitting prism by described optical interface.
Further, described conjunction photon structure comprises the 3rd polarization splitting prism and half of wave plate; Described 3rd polarization splitting prism comprises two oblique 45 ° of polarization spectro faces be arranged in parallel, in the light path that a described half-wave plate polarization beam splitter face located therein is corresponding, between the 3rd polarization splitting prism and the first polarization splitting prism, the angle of its optical axis direction and horizontal polarization light is 45 °.
Further, between described 3rd polarization splitting prism and the first polarization splitting prism, be also provided with a glass sheet, arranged side by side with described half-wave plate, be located in light path corresponding to the 3rd another polarization beam splitter face of polarization splitting prism.
Further, in described housing, be divided into two independently accommodation spaces by a central dividing plate, be respectively used to hold TOSA and ROSA; Described dividing plate is provided with a through hole, and described first polarization splitting prism is arranged on this through hole, and two polarization spectro face lays respectively in two accommodation spaces; Described Faraday rotator, half wave plate group and the second polarization splitting prism and TOSA are located in one accommodation space, or are located in one accommodation space with ROSA.
Further, the light transmitting group of described TOSA comprises laser array and the collimation lens set of four different wave lengths, described WDM structure comprises two conjunction photon unit, and described conjunction photon unit comprises the first completely reflecting mirror, polarization splitting prism, half-wave plate, the second completely reflecting mirror and isolator, and the angle of described half-wave plate optical axis direction and horizontal polarization light is 45 °, laser array sends the linearly polarized light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, and after collimation lens set collimation, λ 1 and λ 2 incides and wherein one closes photon unit, and λ 3 and λ 4 incides another and closes photon unit, the half-wave plate of described conjunction photon unit is located at before polarization splitting prism, be positioned in the input path of λ 1 or λ 3, by the λ 1 of incidence or the polarization direction half-twist of λ 3, described first completely reflecting mirror is positioned in the input path of λ 2 or λ 4, λ 2 or λ 4 is reflexed on described polarization splitting prism, and be orthogonal on the light splitting surface of this polarization splitting prism with λ 1 or λ 3, λ 1 and λ 2 closes bundle respectively and exports after the polarization splitting prism reflection of same conjunction photon unit and transmission, and by the second completely reflecting mirror reflex to described light receive and dispatch share on the first polarization splitting prism of optical texture, the conjunction photon unit of λ 3 and λ 4 also respectively through its place polarization splitting prism reflection and transmission after close bundle export, and by the second completely reflecting mirror reflex to described light transmitting-receiving share on the first polarization splitting prism of optical texture, the isolator of described conjunction photon unit is polarization-dependent isolator, the polarization direction of the linearly polarized light through its isolation is rotated 45 ° again, this isolator is located at polarization splitting prism and second and is all-trans between light-radiating lens, or be located between the second completely reflecting mirror and the first polarization splitting prism, its optical axis direction and level and vertical polarized light are all in 45 ° of angles, and two to close the isolator optical axis direction of photon unit consistent.
Further, the light transmitting group of described TOSA comprises laser array and the collimation lens set of four different wave lengths; Described WDM structure comprises two conjunction photon unit, and described conjunction photon unit comprises the first completely reflecting mirror, filtering diaphragm, the second completely reflecting mirror and isolator; Laser array sends the linearly polarized light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, and after collimation lens set collimation, λ 1 and λ 3 incides and wherein one closes photon unit, and λ 2 and λ 4 incides another and closes photon unit; Wherein oblique 45 ° of a filtering diaphragm closing photon unit is located in λ 1 input path, λ 1 height is opposed that λ 3 is anti-reflection, oblique 45 ° of first completely reflecting mirror is located in λ 3 input path, λ 3 is reflexed on described filtering diaphragm, and be orthogonal on this filtering diaphragm with λ 1, the λ 3 of transmission afterwards closes to restraint with the λ 1 of reflection and exports, and reflexes to the transmitting-receiving of described light share on the first polarization splitting prism of optical texture through the second completely reflecting mirror; Another oblique 45 ° of filtering diaphragm closing photon unit is located in the input path of λ 2, λ 2 height is opposed that λ 4 is anti-reflection, oblique 45 ° of first completely reflecting mirror of this conjunction photon unit is located in the input path of λ 4, λ 4 is reflexed on described filtering diaphragm, and be orthogonal on this filtering diaphragm with λ 2, the λ 4 of transmission afterwards exports with 2-in-1 bundle of λ of reflection, reflexes to the transmitting-receiving of described light share on the first polarization splitting prism of optical texture through the second completely reflecting mirror; The optical axis direction of described isolator is consistent with the polarization direction of incident light, is located between filtering diaphragm and the second completely reflecting mirror, or is located between the second completely reflecting mirror and the first polarization splitting prism.
Further, described WDM structure also comprises a half-wave plate, being located at described two closes between photon unit and the first polarization splitting prism, and its optical axis direction and two closes photon unit, and to export polarisation of light direction be 45 ° of angles, by the output light polarization direction half-twist of two conjunction photon unit.
Further, the light transmitting group of described TOSA comprises laser array and the collimation lens set of four different wave lengths; Described WDM structure comprises two conjunction photon unit, light unit and isolator are closed in the second level; Described conjunction photon unit comprises the first completely reflecting mirror and filtering diaphragm; The described second level is closed light unit and is comprised semi-permeable and semi-reflecting mirror and absorbing sheet; Wherein a conjunction photon unit also comprises one second completely reflecting mirror; Laser array sends the linearly polarized light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, and after collimation lens set collimation, λ 1 and λ 3 incides and wherein one closes photon unit, and λ 2 and λ 4 incides another and closes photon unit; Wherein oblique 45 ° of a filtering diaphragm closing photon unit is located in λ 1 input path, λ 1 height is opposed that λ 3 is anti-reflection, oblique 45 ° of first completely reflecting mirror is located in λ 3 input path, λ 3 is reflexed on described filtering diaphragm, and be orthogonal on this filtering diaphragm with λ 1, the λ 3 of transmission afterwards closes to restraint with the λ 1 of reflection and exports, and reflexes in described semi-permeable and semi-reflecting mirror through the second completely reflecting mirror; Another oblique 45 ° of filtering diaphragm closing photon unit is located in the input path of λ 2, λ 2 height is opposed that λ 4 is anti-reflection, oblique 45 ° of first completely reflecting mirror of this conjunction photon unit is located in the input path of λ 4, λ 4 is reflexed on described filtering diaphragm, and be orthogonal on this filtering diaphragm with λ 2, the λ 4 of transmission afterwards exports with 2-in-1 bundle of λ of reflection, is directly incident in described semi-permeable and semi-reflecting mirror, and is orthogonal on this semi-transflective reflective minute surface with the conjunction Shu Guang of λ 1 and λ 3; In this semi-permeable and semi-reflecting mirror, the λ 2 of transmission and λ 4 closes the λ 1 of Shu Guangyu reflection and λ 3 and closes Shu Guang and again close bundle and export on extinction sheet and absorbed, the λ 2 of reflection and λ 4 closes the λ 1 of Shu Guangyu transmission and λ 3 and closes Shu Guang and again close bundle and export, and incides the transmitting-receiving of described light and share on the first polarization splitting prism of optical texture after described isolator; The optical axis direction of described isolator is consistent with the polarization direction of incident light, is unpolarized dependent isolator; Or described isolator is polarization-dependent isolator, light polarization direction through this isolator is rotated 45 °, and half of wave plate is set up between this isolator and described first polarization splitting prism, the optical axis direction of this half-wave plate and incident light polarization angular separation are 67.5 ° or 22.5 °.
Further, the light-receiving group of described ROSA 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 and three completely reflecting mirrors; The light signal of what described optical interface received comprise four different wave length λ 1, λ 2, λ 3, λ 4 incides on this Wave Decomposition multiplexing structure after optical texture is share in light transmitting-receiving; Described first filtering diaphragm is anti-reflection high anti-to λ 1-λ 3 to λ 4; Described second filtering diaphragm is anti-reflection to λ 3, high anti-to λ 1 and λ 2; Described 3rd filtering diaphragm is anti-reflection to λ 2, high anti-to λ 1; Receiving and dispatching by light the light signal share optical texture outgoing is directly incident on the first 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 this first filtering diaphragm, reflexes on the second 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 second filtering diaphragm, reflexes on the 3rd 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 3rd filtering diaphragm, directly converged to by focus lens group after the reflection of this completely reflecting mirror on PD corresponding to PD group, or the 4th filtering diaphragm is set up between this completely reflecting mirror and convergence lens combination, anti-reflection to λ 1, high anti-to other wavelength light, converged on PD corresponding to PD group by focus lens group transmitted through after the 4th filtering diaphragm by the λ 1 that this completely reflecting mirror reflects.
Beneficial effect of the present invention is: utilize the combination of Faraday rotator, half-wave plate and polarization splitting prism to realize the orthogonal transformation of outgoing and receiving beam polarization state, outgoing beam and receiving beam are produced on polarization splitting prism function that different trends realizes single fiber bi-directional, 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 is single fiber bi-directional BOSA constructive embodiment one schematic diagram of the present invention;
Fig. 2 is TOSA structure one and light path schematic diagram in BOSA structure;
Fig. 3 is ROSA structure and light path schematic diagram in BOSA structure;
Fig. 4 is TOSA structure two and light path schematic diagram in BOSA structure;
Fig. 5 is TOSA structure three and light path schematic diagram in BOSA structure;
Fig. 6 holds light path schematic diagram for the ROSA corresponding to the structure of TOSA shown in Fig. 5 three;
Fig. 7 is single fiber bi-directional BOSA constructive embodiment two schematic diagram.
Accompanying drawing indicates: 1, housing; 101, dividing plate; 2, optical texture is share in light transmitting-receiving; 21, the first polarization splitting prism; 22, Faraday rotator; 221, Faraday rotation sheet; 222, magnetic patch; 23, half wave plate group; 231, upper half-wave plate; 232, lower half-wave plate; 24, the second polarization splitting prism; 25, the 3rd polarization splitting prism; 26, half-wave plate; 27, glass sheet; 3, laser array; 4, collimation lens set; 5, WDM structure; 511, polarization splitting prism; 512, half-wave plate; 513, the first completely reflecting mirror; 514, the second completely reflecting mirror; 515, isolator; 521, the first completely reflecting mirror; 522, filtering diaphragm; 523, the second completely reflecting mirror; 524, isolator; 525, half-wave plate; 531, the first completely reflecting mirror; 532, filtering diaphragm; 533, the second completely reflecting mirror; 534, semi-permeable and semi-reflecting mirror; 535, extinction sheet; 536, isolator; 537, half-wave plate; 6, PD group; 7, focus lens group; 8, WDM structure; 801, the first filtering diaphragm; 802, the second filtering diaphragm; 803, the 3rd filtering diaphragm; 804, the 4th filtering diaphragm; 805, completely reflecting mirror; 9, single optical fiber calibrator.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
The object of the present invention is to provide a kind of single fiber bi-directional BOSA structure for 4 passage 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.Concrete, this single fiber bi-directional BOSA structure, comprise encapsulating housing, TOSA and ROSA, described TOSA comprises light transmitting group and WDM structure; Described ROSA comprises light-receiving group and Wave Decomposition multiplexing structure; This BOSA structure also comprises a light transmitting-receiving and share optical texture; Described shell 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; Described TOSA, ROSA and light transmitting-receiving are share optical texture and are packaged in housing.Utilize the combination of Faraday rotator, half-wave plate and polarization splitting prism to realize the orthogonal transformation of outgoing and receiving beam polarization state, outgoing beam and receiving beam are produced on polarization splitting prism function that different trends realizes single fiber bi-directional.Concrete following embodiment.
As in the embodiment disclosed in figs. 1-3 one, light transmitting-receiving is share optical texture 2 and is comprised the first polarization splitting prism 21, Faraday rotator 22, half wave plate group 23 and the second polarization splitting prism 24 that arrange according to light path, and is located at the conjunction photon structure between the Wave Decomposition multiplexing structure 8 of ROSA and the first polarization splitting prism 21.Wherein, close photon structure and comprise the 3rd polarization splitting prism 25 and half of wave plate 26.First polarization splitting prism 21, second polarization splitting prism 24 and the 3rd polarization splitting prism 25 include two oblique 45 ° of polarization spectro faces be arranged in parallel, and the first polarization splitting prism 21 is arranged with the second polarization splitting prism 24 is vertical with the 3rd polarization splitting prism 25.On WDM structure 5 output light path that two polarization spectro faces of the first polarization splitting prism 21 lay respectively at TOSA and on the input light path of ROSA Wave Decomposition multiplexing structure 8; Described half wave plate group 23 comprises half-wave plate 231 and lower half-wave plate 232, lays respectively in light path corresponding to the second polarization splitting prism 24 two polarization beam splitter faces.
As Fig. 1, be divided into upper and lower two independently accommodation spaces by a central dividing plate 101 in housing 1, be respectively used to hold TOSA and ROSA.Dividing plate 101 is provided with a through hole, and the first polarization splitting prism 21 is arranged on this through hole, and two polarization spectro face lays respectively in two accommodation spaces.Faraday rotator 22, half wave plate group 23 and the second polarization splitting prism 24 are with TOSA with being located in the accommodation space on upper strata, and ROSA is located in lower floor's accommodation space.What optical interface adopted is single optical fiber calibrator 9, is located at the accommodation space one end holding TOSA.
As Fig. 2, be the TOSA structure that this embodiment adopts, its light transmitting group comprises laser array 3 and the collimation lens set 4 of four different wave lengths; WDM structure 5 comprises two conjunction photon unit, this conjunction photon unit comprises the first completely reflecting mirror 513, polarization splitting prism 511, half-wave plate 512, second completely reflecting mirror 514 and isolator 515, and the angle of described half-wave plate 512 optical axis direction and horizontal polarization light is 45 °.Laser array 3 sends the horizontal linear polarization light P light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, and after collimation lens set 4 collimates, λ 1 and λ 2 incides and wherein one closes photon unit, and λ 3 and λ 4 incides another and closes photon unit.Be arranged in the conjunction photon unit of λ 1 and λ 2 light path, its half-wave plate 512 is located at before polarization splitting prism 511, is positioned in the input path of λ 1, is S light by the polarization direction half-twist of the λ 1 of incidence; Its first completely reflecting mirror 513 is positioned in the input path of λ 2, by λ 2(P light) reflex on its polarization splitting prism 511, and be orthogonal on the light splitting surface of this polarization splitting prism 511 with λ 1, λ 1(S light) and λ 2(P light) respectively through this polarization splitting prism 511 reflection and transmission after close bundle export, and by the second completely reflecting mirror 514 reflex to light transmitting-receiving share on the first polarization splitting prism 21 of optical texture 2.Similar, the polarization splitting prism 511 of the conjunction photon unit of λ 3 and λ 4 also respectively through its place reflects and closes bundle after transmission and exports, and reflexes to the transmitting-receiving of described light by the second completely reflecting mirror 514 and share on the first polarization splitting prism 21 of optical texture 2.In this TOSA structure, the isolator 515 closing photon unit is polarization-dependent isolator, the polarization direction of the linearly polarized light through its isolation is rotated 45 ° again, this isolator 515 is located at polarization splitting prism 511 and second and is all-trans between light-radiating lens 514, or be located between the second completely reflecting mirror 514 and the first polarization splitting prism 21, its optical axis direction and horizontal polarization light P light and vertical polarized light S light are all in 45 ° of angles, and two to close isolator 515 optical axis direction of photon unit consistent.In this structure, the λ 1 of conjunction bundle and λ 2 is after the second completely reflecting mirror 514 reflects, incide on the first polarization splitting prism 21 through isolator 515, the λ 1 of S light and the λ 2 of P light incides isolator 515, λ 1 and λ 2 only have the polarized component consistent with isolator 515 optical axis direction (45 °) to pass through, and after being rotated 45 ° again by this isolator 515, become the S light of vertical polarization, incide afterwards on the first polarization splitting prism 21.And close λ 3 and the first S light also exporting vertical polarization after same isolator 515 of λ 4 of bundle, then reflex on the first polarization splitting prism 21 through the second completely reflecting mirror 514, and two bundle S light light paths are parallel to each other.Due to the first polarization splitting prism 21 and the second polarization splitting prism 24, close photon unit polarization splitting prism 511 mutually vertical, so S light is P light for the first polarization splitting prism 21, therefore the λ 1 of conjunction bundle and λ 2, λ 3 and λ 4 can directly incide on Faraday rotator 22 transmitted through the first polarization splitting prism 21.This Faraday rotator 22 comprises the magnetic patch 222 at Faraday rotation sheet 221 and two ends thereof, the polarization direction of the linearly polarized light of process can be rotated 45 °, to illustrate clockwise, S light transmitted through the vertical polarization of the first polarization splitting prism 21 has all been turned clockwise 45 ° after Faraday rotator 22, incides the upper half-wave plate 231 of half wave plate group 23 and lower half-wave plate 232 afterwards respectively.The optical axis angle wherein going up half-wave plate 231 is 22.5 °, and the conjunction Shu Guang of λ 1 and λ 2 incides and this turned clockwise again 45 ° and become P light and incide on the second polarization splitting prism 24 after half-wave plate 231; The optical axis angle of lower half-wave plate 232 is then 67.5 °, and the conjunction Shu Guang of λ 3 and λ 4 incides this lower half-wave plate 232 rear polarizer direction and has been rotated counterclockwise 45 ° and become S light and incide on the second polarization splitting prism 24.The direct transmission of P light (the conjunction Shu Guang of λ 1 and λ 2) inciding the second polarization splitting prism 24 outputs on single optical fiber calibrator 9, the S light (the conjunction Shu Guang of λ 3 and λ 4) inciding the second polarization splitting prism 24 then exports with 2-in-1 bundle of λ 1 and λ after the reflection of the second polarization splitting prism 24 two polarization spectro faces, and be coupled in optical fiber through single optical fiber calibrator 9, achieve TOSA and hold the transmission of four road light to restraint with conjunction.
As Fig. 3, be the ROSA structure that this embodiment adopts, its light-receiving group comprises PD group 6 and focus lens group 7, and Wave Decomposition multiplexing structure 8 comprises the first filtering diaphragm 801, second filtering diaphragm 802, the 3rd filtering diaphragm 803 and three completely reflecting mirrors 805.Wherein, it is high anti-to λ 1-λ 3 that the first 801 pairs, filtering diaphragm λ 4 is anti-reflection, is arranged in the light path of λ 4; Second 802 pairs, filtering diaphragm λ 3 is anti-reflection, high anti-to λ 1 and λ 2, is arranged in the light path of λ 3; 3rd 803 pairs, filtering diaphragm λ 2 is anti-reflection, high anti-to λ 1, is arranged in the light path of λ 2.Three completely reflecting mirrors 805 to be located at after the second filtering diaphragm the 802, the 3rd filtering diaphragm 803 below and in the light path of λ 1 respectively.In this structure, also between the completely reflecting mirror 805 and convergence lens combination 7 of λ 1 light path, set up the 4th filtering diaphragm 804, anti-reflection to λ 1, high anti-to other wavelength light.The light signal received by single optical fiber calibrator 9 includes flashlight λ 1, λ 2, the λ 3 and λ 4 of four road different wave lengths, this light beam is divided into orthogonal two bundle directional light P light and the S light of polarization state after the second polarization splitting prism 24, wherein P light is directly transmitted through the second polarization splitting prism 24, S light is then exported from polarization spectro face below by after twice reflection of two polarization spectro face, and parallel with P optical transmission direction.Wherein P light is turned clockwise 45 ° (seeing in face of this P optical propagation direction) on 22.5 after half-wave plate 231, reenter after being mapped to Faraday rotator 22 afterwards, be rotated counterclockwise 45 ° by Faraday rotator 22 and be reduced to P light, the direction of propagation of holding because of this direction of propagation and TOSA is before contrary, see in face of optical propagation direction equally, Faraday rotator 22 is respectively clockwise with counterclockwise its sense of rotation.And S light is rotated counterclockwise 45 ° after 67.5 ° of lower half-wave plates 232, reenter after being mapped to Faraday rotator 22 afterwards, be rotated counterclockwise 45 ° again by Faraday rotator 22 and become P light.So far the P light that incident light signal is divided into two-way parallel incides on the first polarization splitting prism 21.Because the first polarization splitting prism 21 is mutually vertical with the second polarization splitting prism 24, therefore the P light of incidence is S light for it, thus reflexed to its underpart by two polarization spectro faces of the first polarization splitting prism 21, polarization spectro face below it exports, and incide ROSA end, as shown in Figure 1.As Fig. 3, from two parallel P light of the first polarization splitting prism 21 outgoing (be S light for the first polarization splitting prism 21), incide and close on photon structure, half-wave plate 26 half-twist that wherein 45 °, a P polarisation of light direction, road is arranged becomes S light and incides on the 3rd polarization splitting prism 25, another road P light is directly incident or incide on the 3rd polarization splitting prism 25 through a glass sheet 27, directly then export with P combiner after two polarization spectro face reflections of the 3rd polarization splitting prism 25 transmitted through the 3rd polarization splitting prism 25, S light.This conjunction Shu Guang incides on the first filtering diaphragm 801 of Wave Decomposition multiplexing structure 8, wherein converge on the PD of PD group 6 correspondence by focus lens group 7 after the direct transmission of λ 4, λ 1-λ 3 is reflexed on completely reflecting mirror 805 by this first filtering diaphragm 801, reflex on the second filtering diaphragm 802 through completely reflecting mirror 805, wherein, converge on the PD of PD group 6 correspondence by focus lens group 7 after the direct transmission of λ 3; λ 1 and λ 2 is reflexed on another completely reflecting mirror 805 by the second filtering diaphragm 802, reflexes on the 3rd filtering diaphragm 803 through this completely reflecting mirror 805, wherein, converges on the PD of PD group 6 correspondence after the direct transmission of λ 2 by focus lens group 7; λ 1 is reflexed on last completely reflecting mirror 805 by the 3rd filtering diaphragm 803, incide on the 4th filtering diaphragm 804 after the reflection of this completely reflecting mirror 805, converged on the PD of PD group 6 correspondence by focus lens group 7 transmitted through after the 4th filtering diaphragm 804, realize demultiplexing and the reception of four-way signal beams.
Be illustrated in figure 4 another structure that TOSA end adopts, its light transmitting group comprises laser array 3 and the collimation lens set 4 of four different wave lengths; WDM structure 5 comprises two conjunction photon unit, and described conjunction photon unit comprises the first completely reflecting mirror 521, filtering diaphragm 522, second completely reflecting mirror 523 and isolator 524.Preferably, in this structure, close between photon unit and the first polarization splitting prism 21 at two and be also provided with half of wave plate 525, its optical axis direction and two closes photon unit, and to export polarisation of light direction be 45 ° of angles, by the output light polarization direction half-twist of two conjunction photon unit.Laser array 3 sends the horizontal linear polarization light P light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, and after collimation lens set 4 collimates, λ 1 and λ 3 incides and wherein one closes photon unit, and λ 2 and λ 4 incides another and closes photon unit.Wherein, be arranged in the conjunction photon unit of λ 1 and λ 3 light path, oblique 45 ° of filtering diaphragm 522 is located in λ 1 input path, λ 1 height is opposed that λ 3 is anti-reflection, oblique 45 ° of first completely reflecting mirror 521 is located in λ 3 input path, λ 3 is reflexed on described filtering diaphragm 522, and be orthogonal on this filtering diaphragm 522 with λ 1, the λ 3 of transmission afterwards closes to restraint with the λ 1 of reflection and exports, reflex on isolator 524 through the second completely reflecting mirror 523, this isolator 524 optical axis direction is consistent with light beam polarization direction, the light beam exported through isolator 524 is still P light, reenter and be mapped on described half-wave plate 525.Another closes in photon unit, oblique 45 ° of filtering diaphragm 52 is located in the input path of λ 2, λ 2 height is opposed that λ 4 is anti-reflection, oblique 45 ° of first completely reflecting mirror 521 of this conjunction photon unit is located in the input path of λ 4, λ 4 is reflexed on described filtering diaphragm 522, and be orthogonal on this filtering diaphragm 522 with λ 2, the λ 4 of transmission afterwards exports with 2-in-1 bundle of λ of reflection, reflexed to by the second completely reflecting mirror 523 after isolator 524 and be parallel to each other with the conjunction Shu Guang of λ 1 and λ 3, and incide on described half-wave plate 525; Same, isolator 524 optical axis direction in this conjunction photon unit is consistent with light beam polarization direction, and the light beam exported through this isolator 524 is still P light.Two parallel P light incide described half-wave plate 525, this half-wave plate optical axis direction is 45 ° of settings, two P polarisation of light direction half-twists are become two bundle S light to be incided on the first polarization splitting prism 21, and it is identical that light path afterwards and the light of the structure of TOSA shown in Fig. 2 rear end receive and dispatch the light path share in optical texture.
As shown in Figure 5 be TOSA end adopt another structure, its light transmitting group comprises laser array 3 and the collimation lens set 4 of four different wave lengths; Described WDM structure 5 comprises two conjunction photon unit, light unit and isolator 536 are closed in the second level; Described conjunction photon unit comprises the first completely reflecting mirror 531 and filtering diaphragm 532; The described second level is closed light unit and is comprised semi-permeable and semi-reflecting mirror 534 and absorbing sheet 535; Wherein a conjunction photon unit also comprises one second completely reflecting mirror 533.Laser array 3 sends the horizontal linear polarization light P light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, and after collimation lens set 4 collimates, λ 1 and λ 3 incides and wherein one closes photon unit, and λ 2 and λ 4 incides another and closes photon unit.Wherein, be arranged in the conjunction photon unit of λ 1 and λ 3 light path, oblique 45 ° of filtering diaphragm 532 is located in λ 1 input path, λ 1 height is opposed that λ 3 is anti-reflection, oblique 45 ° of first completely reflecting mirror 531 is located in λ 3 input path, is reflexed on described filtering diaphragm 532 by λ 3, and is orthogonal on this filtering diaphragm 532 with λ 1, the λ 3 of transmission afterwards closes to restraint with the λ 1 of reflection and exports, and reflexes in described semi-permeable and semi-reflecting mirror 534 through the second completely reflecting mirror 533; Another closes in photon unit, oblique 45 ° of filtering diaphragm 532 is located in the input path of λ 2, λ 2 height is opposed that λ 4 is anti-reflection, oblique 45 ° of first completely reflecting mirror 531 of this conjunction photon unit is located in the input path of λ 4, λ 4 is reflexed on described filtering diaphragm 532, and be orthogonal on this filtering diaphragm 532 with λ 2, the λ 4 of transmission afterwards exports with 2-in-1 bundle of λ of reflection, be directly incident in described semi-permeable and semi-reflecting mirror 534, and be orthogonal in this semi-permeable and semi-reflecting mirror 534 with the conjunction Shu Guang of λ 1 and λ 3; In this semi-permeable and semi-reflecting mirror 534, the λ 2 of transmission and λ 4 closes the λ 1 of Shu Guangyu reflection and λ 3 and closes Shu Guang and again close bundle and export on extinction sheet 535 and absorbed, the λ 2 of reflection and λ 4 closes the λ 1 of Shu Guangyu transmission and λ 3 and closes Shu Guang and again close bundle and export, and the conjunction bundle light P light of λ 1-λ 4 incides the transmitting-receiving of described light and share on the first polarization splitting prism 21 of optical texture 2 after described isolator 536.The optical axis direction of isolator 536 is consistent with the polarization direction of incident light, for unpolarized dependent isolator, and the half-wave plate 537 that optical axis is 45 ° is set between isolator 536 and the first polarization splitting prism 21, the P light of incidence being rotated to be 90 ° becomes S light and incides on the first polarization splitting prism 21.Or isolator 536 is polarization-dependent isolator, for counterclockwise, the P light polarization direction of incidence is rotated counterclockwise 45 °, and the half-wave plate 537 that optical axis is 67.5 ° is set between isolator 536 and the first polarization splitting prism 21, the direction of polarized light exported by isolator 536 is again rotated counterclockwise 45 ° and becomes S light, reenters and is mapped on the first polarization splitting prism 21.Arrange because the first polarization splitting prism 21 is vertical with other polarization splitting prism, therefore the S light of incidence is P light for the first polarization splitting prism 21, directly transmitted through its polarization spectro face, can incides on Faraday rotator.
In this structure, because the light beam in TOSA direction share on optical texture 2 for being combined into light beam transmission in light transmitting-receiving, therefore Faraday rotator 22 only can be located at the second polarization splitting prism 24 correspondence that polarization beam splitter in face of face, another one polarization spectro face output light path does not need Faraday rotator 22, and the reception light half-twist that ROSA holds by the half-wave plate only needing 45 °, an optical axis to arrange carries out orthogonal transformation.Specifically as shown in Figure 5, the S Transmission light that TOSA exports turns clockwise 45 ° by Faraday rotator 22 after crossing the first polarization splitting prism 21, turn clockwise 45 ° through the upper half-wave plate 231 of 22.5 ° more afterwards and become P light, thus directly transmitted through the second polarization spectroscope 24, and be coupled in optical fiber by single optical fiber calibrator 9, achieve TOSA and hold the transmission of four road light to restraint with conjunction.As shown in Figure 6, in this structure, the light signal that single optical fiber calibrator 9 receives includes flashlight λ 1, λ 2, the λ 3 and λ 4 of four road different wave lengths, this light beam is divided into orthogonal two bundle directional light P light and the S light of polarization state after the second polarization splitting prism 24, wherein P light is directly transmitted through the second polarization splitting prism 24, S light is then exported from polarization spectro face below by after twice reflection of two polarization spectro face, and parallel with P optical transmission direction.Wherein P light is turned clockwise 45 ° (seeing in face of this P optical propagation direction) on 22.5 after half-wave plate 231, reenter afterwards and be mapped to Faraday rotator 22, be rotated counterclockwise 45 ° by Faraday rotator 22 and be reduced to P light, the direction of propagation of holding because of this direction of propagation and TOSA is before contrary, see in face of optical propagation direction equally, Faraday rotator 22 is respectively clockwise with counterclockwise its sense of rotation.Be directly incident on the first polarization splitting prism 21 after lower half-wave plate 232 half-twist that S light is then arranged through 45 ° becomes P light.Two bundle P light reflex to its underpart through two polarization spectro faces of the first polarization splitting prism 21, and the polarization spectro face below it exports, and incides ROSA end, and light path is afterwards the same with structure shown in Fig. 3.
As shown in Figure 7, for BOSA constructive embodiment two of the present invention, with structure one unlike, light is received and dispatched the Faraday rotator 22, half wave plate group 23 second polarization splitting prism 34 and the ROSA that share optical texture 2 and is held with being located in lower floor's accommodation space of housing, accordingly, optical interface is also located at accommodation space one end face holding ROSA.Its inner structure only needs to make the polarization state of its light beam carry out corresponding orthogonal transformation by the setting of half-wave plate.Such as, the light polarization that TOSA end exports is transformed to P light to be incided on the first polarization splitting prism 21, this P light is S light for the first polarization splitting prism 21, therefore reflex to its underpart through the first polarization splitting prism 21 two polarization spectro faces, incide afterwards on Faraday rotator 22.Equally, through single optical fiber calibrator 9 receive flashlight by corresponding conversion, becoming S light incides on the first polarization splitting prism 21, then direct transmitted through the first polarization splitting prism 21 incide close photon structure close Shu Houzai enter on the Wave Decomposition multiplexing structure 8 of ROSA.
The various embodiments described above utilize the combination of Faraday rotator, half-wave plate and polarization splitting prism to realize the orthogonal transformation of outgoing and receiving beam polarization state, outgoing beam and receiving beam are produced on polarization splitting prism function that different trends realizes single fiber bi-directional, 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.
Although specifically show in conjunction with preferred embodiment and describe the present invention; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; in the form and details to the various changes that the present invention makes, be protection scope of the present invention.
Claims (10)
1. a single fiber bi-directional BOSA structure, comprises encapsulating housing, TOSA and ROSA, and described TOSA comprises light transmitting group and WDM structure; Described ROSA comprises light-receiving group and Wave Decomposition multiplexing structure; It is characterized in that: also comprise a light transmitting-receiving and share optical texture; Described shell 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; Described TOSA, ROSA and light transmitting-receiving are share optical texture and are packaged in housing.
2. single fiber bi-directional BOSA structure as claimed in claim 1, it is characterized in that: described light transmitting-receiving is share optical texture and comprised the first polarization splitting prism, Faraday rotator, half wave plate group and the second polarization splitting prism that arrange according to light path, and is located at the conjunction photon structure between the Wave Decomposition multiplexing structure of ROSA and the first polarization splitting prism, described first polarization splitting prism and the second polarization splitting prism include two oblique 45 ° of polarization spectro faces be arranged in parallel, and two polarization splitting prisms are vertically arranged mutually, on the WDM structure output light path that two polarization spectro faces of described first polarization splitting prism lay respectively at TOSA and on the input light path of ROSA Wave Decomposition multiplexing structure, described half wave plate group comprises half-wave plate and lower half-wave plate, lays respectively in light path corresponding to the second polarization splitting prism two polarization beam splitter faces, described half wave plate group and Faraday rotator combine, together by by the light polarization direction half-twist of half wave plate group and Faraday rotator or 0 °, S light and P light two-route wire polarized light is divided into through the second polarization splitting prism by the flashlight of described optical interface incidence, two-route wire polarized light is respectively through upper half-wave plate and lower half-wave plate, again by after Faraday rotator, two linearly polarized lights are all become P light by rotation and close photon structure by incident after the first polarization splitting prism two secondary reflection, ECDC photon structure is combined into light beam and incides in the Wave Decomposition multiplexing structure of ROSA, and the linearly polarized light that the WDM structure of TOSA exports is directly transmitted through inciding Faraday rotator after the first polarization splitting prism, exported by described optical interface after half wave plate group and the second polarization splitting prism, or two linearly polarized light directly incide conjunction photon structure transmitted through after the first polarization splitting prism through all becoming S light after Faraday rotator, ECDC photon structure is combined into light beam and incides in the Wave Decomposition multiplexing structure of ROSA, the linearly polarized light that the WDM structure of described TOSA exports incides Faraday rotator after two secondary reflections of the first polarization splitting prism, is exported after half wave plate group and the second polarization splitting prism by described optical interface.
3. single fiber bi-directional BOSA structure as claimed in claim 2, is characterized in that: described conjunction photon structure comprises the 3rd polarization splitting prism and half of wave plate; Described 3rd polarization splitting prism comprises two oblique 45 ° of polarization spectro faces be arranged in parallel, in the light path that a described half-wave plate polarization beam splitter face located therein is corresponding, between the 3rd polarization splitting prism and the first polarization splitting prism, the angle of its optical axis direction and horizontal polarization light is 45 °.
4. single fiber bi-directional BOSA structure as claimed in claim 3, it is characterized in that: between described 3rd polarization splitting prism and the first polarization splitting prism, be also provided with a glass sheet, arranged side by side with described half-wave plate, be located in light path corresponding to the 3rd another polarization beam splitter face of polarization splitting prism.
5. single fiber bi-directional BOSA structure as described in any one of claim 2-4, is characterized in that: be divided into two independently accommodation spaces by a central dividing plate in described housing, is respectively used to hold TOSA and ROSA; Described dividing plate is provided with a through hole, and described first polarization splitting prism is arranged on this through hole, and two polarization spectro face lays respectively in two accommodation spaces; Described Faraday rotator, half wave plate group and the second polarization splitting prism and TOSA are located in one accommodation space, or are located in one accommodation space with ROSA.
6. single fiber bi-directional BOSA structure as described in claim 2-4, is characterized in that: the light transmitting group of described TOSA comprises laser array and the collimation lens set of four different wave lengths, described WDM structure comprises two conjunction photon unit, and described conjunction photon unit comprises the first completely reflecting mirror, polarization splitting prism, half-wave plate, the second completely reflecting mirror and isolator, and the angle of described half-wave plate optical axis direction and horizontal polarization light is 45 °, laser array sends the linearly polarized light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, and after collimation lens set collimation, λ 1 and λ 2 incides and wherein one closes photon unit, and λ 3 and λ 4 incides another and closes photon unit, the half-wave plate of described conjunction photon unit is located at before polarization splitting prism, be positioned in the input path of λ 1 or λ 3, by the λ 1 of incidence or the polarization direction half-twist of λ 3, described first completely reflecting mirror is positioned in the input path of λ 2 or λ 4, λ 2 or λ 4 is reflexed on described polarization splitting prism, and be orthogonal on the light splitting surface of this polarization splitting prism with λ 1 or λ 3, λ 1 and λ 2 closes bundle respectively and exports after the polarization splitting prism reflection of same conjunction photon unit and transmission, and by the second completely reflecting mirror reflex to described light receive and dispatch share on the first polarization splitting prism of optical texture, the conjunction photon unit of λ 3 and λ 4 also respectively through its place polarization splitting prism reflection and transmission after close bundle export, and by the second completely reflecting mirror reflex to described light transmitting-receiving share on the first polarization splitting prism of optical texture, the isolator of described conjunction photon unit is polarization-dependent isolator, the polarization direction of the linearly polarized light through its isolation is rotated 45 ° again, this isolator is located at polarization splitting prism and second and is all-trans between light-radiating lens, or be located between the second completely reflecting mirror and the first polarization splitting prism, its optical axis direction and level and vertical polarized light are all in 45 ° of angles, and two to close the isolator optical axis direction of photon unit consistent.
7. single fiber bi-directional BOSA structure as described in claim 2-4, is characterized in that: the light transmitting group of described TOSA comprises laser array and the collimation lens set of four different wave lengths; Described WDM structure comprises two conjunction photon unit, and described conjunction photon unit comprises the first completely reflecting mirror, filtering diaphragm, the second completely reflecting mirror and isolator; Laser array sends the linearly polarized light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, and after collimation lens set collimation, λ 1 and λ 3 incides and wherein one closes photon unit, and λ 2 and λ 4 incides another and closes photon unit; Wherein oblique 45 ° of a filtering diaphragm closing photon unit is located in λ 1 input path, λ 1 height is opposed that λ 3 is anti-reflection, oblique 45 ° of first completely reflecting mirror is located in λ 3 input path, λ 3 is reflexed on described filtering diaphragm, and be orthogonal on this filtering diaphragm with λ 1, the λ 3 of transmission afterwards closes to restraint with the λ 1 of reflection and exports, and reflexes to the transmitting-receiving of described light share on the first polarization splitting prism of optical texture through the second completely reflecting mirror; Another oblique 45 ° of filtering diaphragm closing photon unit is located in the input path of λ 2, λ 2 height is opposed that λ 4 is anti-reflection, oblique 45 ° of first completely reflecting mirror of this conjunction photon unit is located in the input path of λ 4, λ 4 is reflexed on described filtering diaphragm, and be orthogonal on this filtering diaphragm with λ 2, the λ 4 of transmission afterwards exports with 2-in-1 bundle of λ of reflection, reflexes to the transmitting-receiving of described light share on the first polarization splitting prism of optical texture through the second completely reflecting mirror; The optical axis direction of described isolator is consistent with the polarization direction of incident light, is located between filtering diaphragm and the second completely reflecting mirror, or is located between the second completely reflecting mirror and the first polarization splitting prism.
8. single fiber bi-directional BOSA structure as claimed in claim 7, it is characterized in that: described WDM structure also comprises a half-wave plate, being located at described two closes between photon unit and the first polarization splitting prism, its optical axis direction and two closes photon unit, and to export polarisation of light direction be 45 ° of angles, closes the output light polarization direction half-twist of photon unit by two.
9. single fiber bi-directional BOSA structure as described in claim 2-4, is characterized in that: the light transmitting group of described TOSA comprises laser array and the collimation lens set of four different wave lengths; Described WDM structure comprises two conjunction photon unit, light unit and isolator are closed in the second level; Described conjunction photon unit comprises the first completely reflecting mirror and filtering diaphragm; The described second level is closed light unit and is comprised semi-permeable and semi-reflecting mirror and absorbing sheet; Wherein a conjunction photon unit also comprises one second completely reflecting mirror; Laser array sends the linearly polarized light of λ 1, λ 2, λ 3 and λ 4 four different wave lengths, and after collimation lens set collimation, λ 1 and λ 3 incides and wherein one closes photon unit, and λ 2 and λ 4 incides another and closes photon unit; Wherein oblique 45 ° of a filtering diaphragm closing photon unit is located in λ 1 input path, λ 1 height is opposed that λ 3 is anti-reflection, oblique 45 ° of first completely reflecting mirror is located in λ 3 input path, λ 3 is reflexed on described filtering diaphragm, and be orthogonal on this filtering diaphragm with λ 1, the λ 3 of transmission afterwards closes to restraint with the λ 1 of reflection and exports, and reflexes in described semi-permeable and semi-reflecting mirror through the second completely reflecting mirror; Another oblique 45 ° of filtering diaphragm closing photon unit is located in the input path of λ 2, λ 2 height is opposed that λ 4 is anti-reflection, oblique 45 ° of first completely reflecting mirror of this conjunction photon unit is located in the input path of λ 4, λ 4 is reflexed on described filtering diaphragm, and be orthogonal on this filtering diaphragm with λ 2, the λ 4 of transmission afterwards exports with 2-in-1 bundle of λ of reflection, is directly incident in described semi-permeable and semi-reflecting mirror, and is orthogonal on this semi-transflective reflective minute surface with the conjunction Shu Guang of λ 1 and λ 3; In this semi-permeable and semi-reflecting mirror, the λ 2 of transmission and λ 4 closes the λ 1 of Shu Guangyu reflection and λ 3 and closes Shu Guang and again close bundle and export on extinction sheet and absorbed, the λ 2 of reflection and λ 4 closes the λ 1 of Shu Guangyu transmission and λ 3 and closes Shu Guang and again close bundle and export, and incides the transmitting-receiving of described light and share on the first polarization splitting prism of optical texture after described isolator; The optical axis direction of described isolator is consistent with the polarization direction of incident light, is unpolarized dependent isolator; Or described isolator is polarization-dependent isolator, light polarization direction through this isolator is rotated 45 °, and half of wave plate is set up between this isolator and described first polarization splitting prism, the optical axis direction of this half-wave plate and incident light polarization angular separation are 67.5 ° or 22.5 °.
10. single fiber bi-directional BOSA structure as described in claim 2-4, is characterized in that: the light-receiving group of described ROSA 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 and three completely reflecting mirrors; The light signal of what described optical interface received comprise four different wave length λ 1, λ 2, λ 3, λ 4 incides on this Wave Decomposition multiplexing structure after optical texture is share in light transmitting-receiving; Described first filtering diaphragm is anti-reflection high anti-to λ 1-λ 3 to λ 4; Described second filtering diaphragm is anti-reflection to λ 3, high anti-to λ 1 and λ 2; Described 3rd filtering diaphragm is anti-reflection to λ 2, high anti-to λ 1; Receiving and dispatching by light the light signal share optical texture outgoing is directly incident on the first 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 this first filtering diaphragm, reflexes on the second 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 second filtering diaphragm, reflexes on the 3rd 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 3rd filtering diaphragm, directly converged to by focus lens group after the reflection of this completely reflecting mirror on PD corresponding to PD group, or the 4th filtering diaphragm is set up between this completely reflecting mirror and convergence lens combination, anti-reflection to λ 1, high anti-to other wavelength light, converged on PD corresponding to PD group by focus lens group transmitted through after the 4th filtering diaphragm by the λ 1 that this completely reflecting mirror reflects.
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| CN104950407A (en) * | 2015-06-30 | 2015-09-30 | 匠研光学科技（上海）有限公司 | BOSA (bi-directional optical sub-assembly) structure |
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