CN104838605A

CN104838605A - Optical transceiver and method for processing optical signal

Info

Publication number: CN104838605A
Application number: CN201380002436.8A
Authority: CN
Inventors: 陈波; 宋小鹿; 吕杰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-12-03
Filing date: 2013-12-03
Publication date: 2015-08-12
Anticipated expiration: 2033-12-03
Also published as: CN104838605B; WO2015081501A1

Abstract

Provided in an embodiment of the present invention are an optical transceiver and a method for processing optical signals. Low-loss reception and transmission of optical signals can be achieved simply by using an optical interface, a birefringent crystal, a polarization deflection component, a polarization beam splitter, a transmitter optical sub assembly, and a receiver optical sub assembly, without requiring many optical elements and having the advantages of easy assembly and low cost; in addition, fewer optical elements allow the corresponding optical transceiver to be more compact and smaller in size, thus meeting the requirement of modern communication device miniaturization.

Description

Optical transceiver and method for processing optical signal

A kind of optical transceiver and the method for handling optical signal

Technical field

The present invention relates to communication technical field, and in particular to a kind of optical transceiver and the method for handling optical signal.Background technology

Sending and receiving for optical signal is most basic function that optical communication field need to be realized.Sending and receiving for optical signal is realized often through optical transmitter and optical receiver.Because the transmission of optical signal is all generally two-way, need optical transmitter and optical receiver being embodied by an optical transceiver, for realizing sending and receiving for optical signal simultaneously.

Optical transceiver can convert electrical signals to optical signal and optical signal is coupled into optical fiber to send, while the optical signal received from optical fiber can be converted into electric signal.Number of fibers according to being used in optical transceiver communication process is classified, and optical transceiver can be divided into：Use transmitting optical assembly（Transmitter Optical Sub Assembly, TOSA) and optical assembly (Receiver Optical Sub Assembly are received, ROSA common optical transceiver), TOSA and ROSA, which are respectively used to realize, sends optical signal and reception optical signal, wherein send optical signal and receive optical signal and use independent optical fiber, one, which goes out one, enters to need two optical fiber；Another uni-core bidirectional optical transceiver uses two-way optical assembly（Bi-directional Optical Sub Assembly, BOSA), while realizing sending and receiving for optical signal, turnover shares an optical fiber.As schemed shown in la, the communication bilateral of common optical transceiver has two ports respectively, is respectively used to receive and dispatch optical signal, corresponding communication is also required to two optical fiber.As described in scheming lb, the communication bilateral of uni-core bidirectional optical transceiver each only needs to a port, while also only needing to the transmitting-receiving that an optical fiber enters traveling optical signal.Uni-core bidirectional optical transceiver can save the optical fiber of half, will be played a significant role in the optical communication system in modern and future.

Inventor has found in research process, the optical element that uni-core bidirectional optical transceiver of the prior art is included is more, cause assembly difficulty and cost larger, simultaneously, substantial amounts of optical element also make it that the overall volume of uni-core bidirectional optical transceiver is larger, it is difficult to adapt to the demand of communications field device miniaturization.The content of the invention

In view of this, the embodiment of the present invention provides a kind of optical transceiver and the method for handling optical signal.Optical transceiver provided in an embodiment of the present invention include optical interface, birefringece crystal, polarization deflection component, Polarization beam apparatus, light emitting members, light-receiving member, wherein：The optical interface, is used for and fiber coupling, receives the incident light from the optical fiber；The birefringece crystal, for by the incident light from the optical interface be decomposed into polarization direction be mutually perpendicular to, the first polarised light and the second polarised light of symport；The polarization deflection component, deflection for carrying out polarization direction at least a branch of polarised light in the first polarised light and the second polarised light of the birefringece crystal so that the polarization direction of the first polarised light and the second polarised light turns into the polarization direction of identical first；The polarization beam apparatus, the polarization direction for reflecting incidence is the first polarised light and the second polarised light of the first polarization direction；The light-receiving member, for receiving the first polarised light and the second polarised light that the polarization direction that the polarization beam apparatus is reflected is the first polarization direction；The light emitting members, for launching the 3rd polarised light that polarization direction is the second polarization direction, second polarization direction and first polarization direction are perpendicular；The polarization beam apparatus, it is additionally operable to pass through the 3rd polarised light from the light emitting members, wherein, through the 3rd polarised light of the polarization beam apparatus, it is located on the same line with the first polarised light of the incident polarization beam apparatus and transmission direction is opposite；The polarization deflection component, it is additionally operable to carry out the 3rd polarised light from the polarization beam apparatus deflection of polarization direction, wherein, the 3rd polarised light after the polarization deflection component deflection is located along the same line with the first polarised light of the incident polarization deflection component, transmission direction is opposite and polarization direction is identical；The birefringece crystal, is additionally operable to receive the 3rd polarised light from the polarization deflection component, and the 3rd polarised light received is transported into the optical interface；The optical interface, is additionally operable to the 3rd polarised light from the birefringece crystal transporting to the optical fiber.With reference to the optical transceiver, in a kind of possible implementation, the polarization deflection component includes magnetic rotation luminescent crystal, and the magnetic rotation luminescent crystal is used for the deflection at polarization direction 45 degree of angles of progress of polarised light under the influence of a magnetic field to the incident magnetic rotation luminescent crystal.Implementation with reference to more than, in another possible implementation, the polarization deflector horizontal deflection.Implementation with reference to more than, in another possible implementation, the polarization deflection component specifically includes the first magnetic rotation luminescent crystal and the first half-wave plate；First half-wave plate is used to enter the polarization direction from the first polarised light of the birefringece crystal horizontal deflection, and the first magnetic rotation luminescent crystal is used in the presence of the first magnetic field, to by described the first half The polarization direction of the first polarised light after wave plate deflection carries out 45 degree of deflections again, and the first polarised light after first half-wave plate and the first magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the first polarised light after first half-wave plate and the first magnetic rotation luminescent crystal deflection is first polarization direction；The first magnetic rotation luminescent crystal is additionally operable in the presence of first magnetic field, 45 degree of deflections are carried out for the polarization direction of the 3rd polarised light of the second polarization direction to the polarization direction from the polarization beam apparatus, first half-wave plate is additionally operable to enter the polarization direction of the 3rd polarised light after the first magnetic rotation luminescent crystal deflection again horizontal deflection, and the 3rd polarised light after the first magnetic rotation luminescent crystal and first half-wave plate deflection is transported into the birefringece crystal.Further, the polarization deflection component specifically also includes the second half-wave plate；Second half-wave plate is used to enter horizontal deflection to the polarization direction of the second polarised light from the birefringece crystal, the first magnetic rotation luminescent crystal is additionally operable in the presence of first magnetic field, 45 degree of deflections are carried out again to the polarization direction of the second polarised light after second half-wave plate deflection, and the second polarised light after second half-wave plate and the first magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the second polarised light after second half-wave plate and the first magnetic rotation luminescent crystal deflection is first polarization direction.The embodiment of the present invention also provides a kind of method for handling optical signal, including：Using birefringece crystal by the incident light that optical interface is received resolve into polarization direction be mutually perpendicular to, the first polarised light and the second polarised light of symport；Using polarize deflection component in the first polarised light and the second polarised light of the birefringece crystal at least a branch of polarised light carry out polarization direction deflection so that the polarization direction of the first polarised light and the second polarised light turn into the polarization direction of identical first；The first polarised light and the second polarised light from the polarization deflection component are reflected using polarization beam apparatus；The first polarised light and the second polarised light from the polarization beam apparatus are received using light-receiving member；Using the polarization beam apparatus through the 3rd polarised light that polarization direction is the second polarization direction, second polarization direction and first polarization direction are perpendicular；The deflection of polarization direction is carried out to the 3rd polarised light from the polarization beam apparatus using the polarization deflection component, wherein, the 3rd polarised light after the polarization deflection component deflection is located along the same line with the first polarised light of the incident polarization deflection component, transmission direction is opposite and polarization direction is identical；The 3rd polarised light from polarization deflection component is received using the birefringece crystal, and the 3rd polarised light received is transported into the optical interface.With reference to this method, in a kind of possible implementation, it is described using polarize deflection component in the first polarised light and the second polarised light of the birefringece crystal at least a branch of polarised light carry out polarization direction deflection so that the polarization direction of the first polarised light and the second polarised light is polarized as identical first Direction, including：The deflection of polarization direction is carried out at least a branch of polarised light in the first polarised light and the second polarised light of the birefringece crystal using the magnetic rotation luminescent crystal and half-wave plate polarized in deflection component, so that the polarization direction of the first polarised light and the second polarised light turns into the polarization direction of identical first, wherein, the magnetic rotation luminescent crystal is 45 degree to the deflection angle of the polarization direction of the polarised light of the incident magnetic rotation luminescent crystal.Optical transceiver provided in an embodiment of the present invention and the method for handling optical signal, the light received is divided into two perpendicular beam polarised lights of polarization direction using birefringece crystal, recycle deflection of the polarization deflection component at least a branch of carry out polarization direction in two beam polarised lights so that polarization side's receiving part of two beam polarised lights is received；In the reverse direction, the polarised light that light emitting members are launched is passed through using polarization beam apparatus, polarization deflection component is recycled to enter horizontal deflection to the polarised light from polarization beam apparatus, so that polarised light after the polarization deflection component deflection is located along the same line with a branch of in the incident two beam polarised lights for polarizing deflection component, transmission direction is opposite and polarization direction is identical, couples the light into corresponding optical interface finally by birefringece crystal and send.Optical transceiver provided in an embodiment of the present invention and the method for handling optical signal, only need optical interface, birefringece crystal, polarization deflection component, polarization beam apparatus, light emitting members, light-receiving member, the low damage that optical signal can be achieved is received and sent, used optical element is less, with assembling advantage easy, with low cost, simultaneously less optical element make it that corresponding optical transceiver is more compact, and volume is smaller, can meet the demand of modern communicationses device miniaturization.Brief description of the drawings

The accompanying drawing used required in embodiment or description of the prior art does one and singly introduced, apparently, drawings in the following description are some embodiments of the present invention, for those of ordinary skill in the art, without having to pay creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.

Figure la is a kind of optical transceiver provided in the prior art；

Figure lb is another optical transceiver provided in the prior art；

Fig. 2 is a kind of top view of optical transceiver provided in an embodiment of the present invention；

Fig. 3 is a kind of top view of optical transceiver provided in an embodiment of the present invention；

Fig. 4 is the side view of the optical transceiver provided in Fig. 3 of the embodiment of the present invention；

Fig. 5 is the side view of the optical transceiver provided in Fig. 3 of the embodiment of the present invention； Fig. 6 is a kind of top view of optical transceiver provided in an embodiment of the present invention；

Fig. 7 is the side view of the optical transceiver provided in Fig. 6 of the embodiment of the present invention;

Fig. 8 is a kind of side view of optical transceiver provided in an embodiment of the present invention；

Fig. 9 is a kind of side view of optical transceiver provided in an embodiment of the present invention.

Embodiment is to make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to the scope of protection of the invention.It is worth noting that, " coupling ", " connection " described in the embodiment of the present invention can include direct physical connection, it can also only refer to the annexation in light path.The embodiment of the present invention provides a kind of optical transceiver, including optical interface, birefringece crystal, polarization deflection component, polarization beam apparatus, light emitting members, light-receiving member, wherein：The optical interface, is used for and fiber coupling, receives the incident light from the optical fiber；The birefringece crystal, for by the incident light from the optical interface be decomposed into polarization direction be mutually perpendicular to, the first polarised light and the second polarised light of symport；The polarization deflection component, deflection for carrying out polarization direction at least a branch of polarised light in the first polarised light and the second polarised light of the birefringece crystal so that the polarization direction of the first polarised light and the second polarised light turns into the polarization direction of identical first；The polarization beam apparatus, the polarization direction for reflecting incidence is the first polarised light and the second polarised light of the first polarization direction；The light-receiving member, for receiving the first polarised light and the second polarised light that the polarization direction that the polarization beam apparatus is reflected is the first polarization direction；The light emitting members, for launching the 3rd polarised light that polarization direction is the second polarization direction, second polarization direction and first polarization direction are perpendicular；The polarization beam apparatus, it is additionally operable to pass through the 3rd polarised light from the light emitting members, wherein, through the 3rd polarised light of the polarization beam apparatus, it is located on the same line with the first polarised light of the incident polarization beam apparatus and transmission direction is opposite；The polarization deflection component, is additionally operable to carry out the 3rd polarised light from the polarization beam apparatus deflection of polarization direction, wherein, the after the polarization deflection component deflection Three polarised lights are located along the same line with the first polarised light of the incident polarization deflection component, transmission direction is opposite and polarization direction is identical；The birefringece crystal, is additionally operable to receive the 3rd polarised light from the polarization deflection component, and the 3rd polarised light received is transported into the optical interface；The optical interface, is additionally operable to the 3rd polarised light from the birefringece crystal transporting to the optical fiber.Optionally, the polarization deflection component includes magnetic rotation luminescent crystal, and the magnetic rotation luminescent crystal is used for the deflection at polarization direction 45 degree of angles of progress of polarised light under the influence of a magnetic field to the incident magnetic rotation luminescent crystal.Optionally, the polarization deflection component also includes half-wave plate, and the half-wave plate is used to enter horizontal deflection to the polarization direction of the polarised light of the incident half-wave plate.Optionally, the polarization deflection component specifically includes the first magnetic rotation luminescent crystal and the first half-wave plate；First half-wave plate is used to enter horizontal deflection to the polarization direction of the first polarised light from the birefringece crystal, the first magnetic rotation luminescent crystal is used in the presence of the first magnetic field, 45 degree of deflections are carried out again to the polarization direction of the first polarised light after first half-wave plate deflection, and the first polarised light after first half-wave plate and the first magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the first polarised light after first half-wave plate and the first magnetic rotation luminescent crystal deflection is first polarization direction；The first magnetic rotation luminescent crystal is additionally operable in the presence of first magnetic field, 45 degree of deflections are carried out for the polarization direction of the 3rd polarised light of the second polarization direction to the polarization direction from the polarization beam apparatus, first half-wave plate is additionally operable to enter the polarization direction of the 3rd polarised light after the first magnetic rotation luminescent crystal deflection again horizontal deflection, and the 3rd polarised light after the first magnetic rotation luminescent crystal and first half-wave plate deflection is transported into the birefringece crystal.Further, the polarization deflection component specifically also includes the second half-wave plate；Second half-wave plate is used to enter horizontal deflection to the polarization direction of the second polarised light from the birefringece crystal, the first magnetic rotation luminescent crystal is additionally operable in the presence of first magnetic field, 45 degree of deflections are carried out again to the polarization direction of the second polarised light after second half-wave plate deflection, and the second polarised light after second half-wave plate and the first magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the second polarised light after second half-wave plate and the first magnetic rotation luminescent crystal deflection is first polarization direction.Optionally, the polarization deflection component specifically includes the second magnetic rotation luminescent crystal and the 3rd half-wave plate；The second magnetic rotation luminescent crystal is used in the presence of the second magnetic field, to first from the birefringece crystal The polarization direction of polarised light carries out 45 degree of deflections, 3rd half-wave plate is used to enter horizontal deflection again to the polarization direction of the first polarised light after the second magnetic rotation luminescent crystal deflection, and the first polarised light after the second magnetic rotation luminescent crystal and the 3rd half-wave plate deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the first polarised light after the second magnetic rotation luminescent crystal and the 3rd half-wave plate deflection is first polarization direction；Horizontal deflection is entered in the polarization direction that 3rd half-wave plate is additionally operable to the polarization direction from the polarization beam apparatus for the 3rd polarised light of the second polarization direction, the second magnetic rotation luminescent crystal is additionally operable in the presence of second magnetic field, and 45 degree of deflections are carried out again to the polarization direction of the 3rd polarised light after the 3rd half-wave plate deflection.Further, the polarization deflection component specifically also includes the 4th half-wave plate；The second magnetic rotation luminescent crystal is additionally operable in the presence of second magnetic field, 45 degree of deflections are carried out to the polarization direction of the second polarised light from the birefringece crystal, 4th half-wave plate is additionally operable to enter horizontal deflection again to the polarization direction of the second polarised light after the second magnetic rotation luminescent crystal deflection, and the second polarised light after the second magnetic rotation luminescent crystal and the 4th half-wave plate deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the second polarised light after the second magnetic rotation luminescent crystal and the 4th half-wave plate deflection is first polarization direction.Optionally, the polarization deflection component specifically includes the 3rd magnetic rotation luminescent crystal and the 4th magnetic rotation luminescent crystal；The 3rd magnetic rotation luminescent crystal is used to carry out the polarization direction of the first polarised light from the birefringece crystal 45 degree of deflections, and the first polarised light after the 3rd magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the first polarised light after the 3rd magnetic rotation luminescent crystal deflection is first polarization direction；It is additionally operable to carry out 45 degree of deflections to the polarization direction from the polarization beam apparatus for the polarization direction of the 3rd polarised light of the second polarization direction；The 4th magnetic rotation luminescent crystal is used to carry out the polarization direction of the second polarised light from the birefringece crystal 45 degree of deflections, and the second polarised light after the 4th magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the second polarised light after the 4th magnetic rotation luminescent crystal deflection is first polarization direction.Optionally, the polarization deflection component specifically includes the 5th magnetic rotation luminescent crystal and the 5th half-wave plate；The 5th magnetic rotation luminescent crystal is used to carry out the polarization direction of the first polarised light from the birefringece crystal 45 degree of deflections, and the first polarised light after the 5th magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the first polarised light after the 5th magnetic rotation luminescent crystal deflection is first polarization direction；It is additionally operable to be the second polarization side to the polarization direction from the polarization beam apparatus To the 3rd polarised light polarization direction carry out 45 degree deflect；5th half-wave plate is used to carry out the polarization direction of the second polarised light from the birefringece crystal 45 degree of deflections, and the second polarised light after the 5th half-wave plate deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the second polarised light after the 5th half-wave plate deflection is first polarization direction.Optionally, the polarization deflection component also includes magnet ring, and the magnet ring is used to provide magnetic field for magnetic rotation luminescent crystal.Optionally, the light emitting members are the light emitting devices for launching single-wavelength light；Or, the light emitting members include the light emitting devices for being used to launch multiple wavelength lights, and for converging the multiplex device of multiple wavelength lights；The light-receiving member is the light receiving element for receiving single-wavelength light；Or, the light-receiving member includes multiple light receiving elements for being used to receive single-wavelength light, and the wave-dividing device for the light of each wavelength in separately multiple wavelength lights.The embodiment of the present invention also provides a kind of method for handling optical signal, including：Using birefringece crystal by the incident light that optical interface is received resolve into polarization direction be mutually perpendicular to, the first polarised light and the second polarised light of symport；Using polarize deflection component in the first polarised light and the second polarised light of the birefringece crystal at least a branch of polarised light carry out polarization direction deflection so that the polarization direction of the first polarised light and the second polarised light turn into the polarization direction of identical first；The first polarised light and the second polarised light from the polarization deflection component are reflected using polarization beam apparatus；The first polarised light and the second polarised light from the polarization beam apparatus are received using light-receiving member；Using the polarization beam apparatus through the 3rd polarised light that polarization direction is the second polarization direction, second polarization direction and first polarization direction are perpendicular；The deflection of polarization direction is carried out to the 3rd polarised light from the polarization beam apparatus using the polarization deflection component, wherein, the 3rd polarised light after the polarization deflection component deflection is located along the same line with the first polarised light of the incident polarization deflection component, transmission direction is opposite and polarization direction is identical；The 3rd polarised light from polarization deflection component is received using the birefringece crystal, and the 3rd polarised light received is transported into the optical interface.Optionally, it is described using polarize deflection component in the first polarised light and the second polarised light of the birefringece crystal at least a branch of polarised light carry out polarization direction deflection, so that the polarization direction of the first polarised light and the second polarised light turns into the polarization direction of identical first, including：Using the magnetic rotation luminescent crystal and half-wave plate polarized in deflection component in the first polarised light and the second polarised light of the birefringece crystal At least a branch of polarised light carry out polarization direction deflection, so that the polarization direction of the first polarised light and the second polarised light turns into the polarization direction of identical first, wherein, the magnetic rotation luminescent crystal is 45 degree to the deflection angle of the polarization direction of the polarised light of the incident magnetic rotation luminescent crystal.Below, the embodiment of the present invention will be described in detail with reference to accompanying drawing.As shown in Fig. 2, optical transceiver provided in an embodiment of the present invention includes optical interface, birefringece crystal, polarization deflection component, polarization beam apparatus, light-receiving member and light emitting members.Incident light in the exemplary only accompanying drawings of Fig. 2, figure（The light of external fiber input）It is broken down into the two orthogonal polarised lights in beam polarization direction, it is referred to as the first polarised light and the second polarised light, wherein, the polarization direction for the 3rd polarised light that the first polarised light in two beam polarised lights after being decomposed in figure is exemplarily sent with light emitting members is identical.In Fig. 2, the first polarised light is identical with the 3rd polarization light polarization direction, and transmission direction is on the contrary, in fact coincide together.The first polarised light coincided together and the 3rd polarised light transmitted in opposite directions in order to become apparent from explanation scheme in figure being located along the same line is shown as the state being slightly disengaged.It is merely illustrative in the embodiment of the present invention, optionally, 3rd polarised light can receive the signal being carried on the light of Same Wavelength again while can also sending signal with the light of the second polarised light rather than first one wavelength of polarization, it can be used for multi-wavelength bidirectional communication, the signal being carried on the light of multiple wavelength can be received again while being carried on the signal of the light of multiple wavelength by sending, it can also be that Single wavelength sends multi-wavelength and received or multi-wavelength transmission Single wavelength reception, it is without limitation.What deserves to be explained is, the first polarization direction in all embodiments of the invention is that vertical direction, the second polarization direction are horizontal direction, merely illustrative, is not construed as limiting the invention.Wherein, optical interface is coupled with external fiber（Or connection）, for receiving the optical signal from external fiber, and send the optical signal that the optical transceiver is sent out.Simultaneously, the optical interface is also coupled with birefringece crystal, i.e. optical interface first receives the optical signal of external fiber input, again by it is correspondingly received to optical signal transport to birefringece crystal, in the reverse direction, the optical signal from birefringece crystal is first received, then the optical signal from birefringece crystal is transported into external fiber.Specifically, the optical interface can be light connects device or coupled apparatus.Light beam incides anisotropic crystal, the phenomenon that can be decomposed into two-beam and be reflected along different directions, and this two-beam is the mutually perpendicular linearly polarized light in polarization direction.The crystal of this anisotropic is referred to as birefringence Crystal, English is incident lights of the Bi refr ingent Crys ta h from optical interface, in most cases Wei Elliptical Round polarised lights or linearly polarized light, it can certainly be natural light, the incident light is broken down into two beam polarised lights in birefringece crystal, and the first polarised light is referred to as here（The polarised light of top in figure）With the second polarised light（The polarised light of lower section in figure）.The polarization direction of the two polarised lights, one and principal plane（The plane that birefringece crystal optical axis is constituted with incident ray）Vertically, referred to as ordinary ray（0 light）；Another is in principal plane, referred to as extraordinary ray（E light）.Ordinary ray follows the law of refraction, and extraordinary ray does not follow the law of refraction.Polarize the deflection that deflection component carries out polarization direction at least a branch of polarised light in the first polarised light and the second polarised light.In Fig. 2, the deflection of polarization direction is exemplarily only carried out to the first polarised light；In fact, optionally, if there is skew from the direction of polarized light in the angle and Fig. 2 of the polarised light of birefringece crystal outgoing, the deflection of polarization direction is then all carried out to the first polarised light and the second polarised light, so that the polarization direction of the first polarised light and the second polarised light after deflection is identical, and it is perpendicular with the polarization light polarization direction of light emitting members transmitting.Polarization beam apparatus in the embodiment of the present invention can be used for the perpendicular polarised light in separated polarization direction.In Fig. 2, the first polarised light and the second polarization light polarization direction from polarization deflection component are identical but perpendicular with the polarization direction of the 3rd polarised light from light emitting members.Polarization beam apparatus is arranged to the polarised light that can just launch through light emitting members, and reflects the polarised light from polarization deflection component.Light-receiving member is used to receive the polarised light from polarization beam apparatus.Light-receiving member, can include PN type photodiodes, can include avalanche photodide, can also include other devices for being used to receive optical signal.Optionally, can be that two devices for receiving optical signals are respectively used to receive the first polarised light and the second polarised light, can be one reception optical signal device different zones receive respectively the first polarised light and the second polarised light or by coupled lens will the first polarised light and the second polarised light convergence after receive again.If in Single wavelength communication system, the light-receiving member can be corresponding photo-detector, such as PN types photodiode, or avalanche photodide, or other devices for receiving optical signal, or the combination of these photo-detectors and coupled lens.If in multi-wavelength communication system, light-receiving member can include multiple photo-detectors, and for separating the wave-dividing device of each wavelength, when receiving optical signal, the optical signal of each wavelength is separated first with wave-dividing device, recycles multiple photo-detectors to receive the optical signal of each wavelength respectively.Here wave-dividing device, function of its function equivalent to demultiplexer.Light-receiving member can be used for receiving after optical signal, convert optical signal into electric signal, Electric signal is transported into corresponding processing module again or processing component is handled.Light emitting members, can be the lasers for launching single wavelength, can be either the chip of laser for the laser array or separation for launching multiple wavelength, or array laser chip.If in Single wavelength communication, then light emitting members can be only the laser of a transmitting Single wavelength；If in multi-wavelength communication system, the light emitting members can include the laser array for being used to launch multiple wavelength, or the chip of laser separated, or array laser chip, and for converging the multiplex device of multiple wavelength lights.Laser array, chip of laser or array laser chip, the light for the multiple wavelength launched need to finally be launched again by the first multiplex of multiple multiplex devices, transport to polarization beam apparatus.Here function of the function equivalent to multiplexer of multiplex device.Wherein, if in multi-wavelength communication system, the polarization direction for multiple polarised lights that light emitting members are launched is identical, forms the 3rd polarised light after multiple polarised light multiplex, namely the 3rd polarised light here can contain that multiple wavelength are different but polarization direction identical polarised light.It is appreciated that carrying corresponding communication information in the light that laser is launched.Further, corresponding polarization direction can also be included in light emitting members and adjusts part, the polarization direction for modulating the polarised light that laser or laser array are sent so that what light emitting members were finally sent

When receiving optical signal, the optical signal received is first transported to birefringece crystal by the optical interface coupled with external fiber.The optical signal received is decomposed into that polarization direction is orthogonal by birefringece crystal, the first polarised light and the second polarised light of cocurrent and parallel transmission.Polarization deflection component enters horizontal deflection processing at least a branch of polarised light in the first polarised light and the second polarised light, so that the polarization direction of the first polarised light and the second polarised light after deflection is the polarization direction of identical first, the polarised light that polarization direction is the first polarization direction is represented Yong the lines of Dai Round points in Fig. 2.Because, in incident polarization deflection component, the polarization direction of first polarised light and the polarization direction of the second polarised light are perpendicular, make it that both polarization directions are identical after polarization deflection, then the deflection angle of two beam polarised lights will differ 90 degree during to incidence.If i.e. incident polarization deflection component when, when the polarization direction of the second polarised light is just the first polarization direction, without carrying out polarised light to the second polarised light, need to only carry out 90 degree to the first polarised light and deflect.If during incident polarization deflection component, the polarization direction of the second polarised light and the first polarization direction into Θ spend when, Θ degree deflections can be carried out to the second polarised light, and the first polarised light is carried out（90+ Θ) degree deflection, Θ can be that positive-angle can also be negative angle here.The first polarised light and the second polarised light after polarization deflection are in the first polarization direction, are received after being reflected by polarization beam apparatus by light-receiving member.When launching optical signal, it is the 3rd inclined of the second polarization direction that light emitting members, which first send polarization direction, Shake light, represents polarised light of the polarization direction for the second polarization direction in Fig. 2 with the lines with short-term.Polarization beam apparatus is arranged to the 3rd polarised light through the second polarization direction, and the 3rd polarised light and the first polarised light coincidence transmission direction through polarization beam apparatus are opposite.Polarize deflection component, the deflection of polarization direction is carried out to the 3rd polarised light so that the 3rd polarised light after the polarization deflection component deflection is located along the same line with the first polarised light of the incident polarization deflection component, transmission direction is opposite and polarization direction is identical.In Fig. 2, the first polarised light and the 3rd polarization light polarization direction on the right side of polarization deflection component are identical, and the polarization direction of the first polarised light and the 3rd polarised light on the left of polarization deflection component differs 90 degree.It can be seen that, polarization deflection component differs 90 degree for the deflection angle of two opposite the first polarised lights of beam polarised light of transmission direction and the 3rd polarised light.The difference of this deflection angle, in a kind of mode, polarization deflection component can include magnetic rotation luminescent crystal and half-wave plate, combined and realized using the nonreciprocity of polarization deflection and the polarization deflection of half-wave plate of magnetic rotation luminescent crystal；In another way, polarization deflection component can include circulator, half-wave plate, can first pass through the circulator light different to the direction of propagation and carry out branch, and the light for recycling different half-wave plates different to the direction of propagation carries out the different polarization deflection of angle respectively；Other can also be used known or the different device of the following polarization deflection angle that can realize different directions that can be used.The 3rd polarised light after polarization deflection component deflection is coupled into the optical interface via birefringece crystal, is finally sent to external fiber.

Optical transceiver provided in an embodiment of the present invention and the method for handling optical signal, the light received is divided into two perpendicular beam polarised lights of polarization direction using birefringece crystal, recycle deflection of the polarization deflection component at least a branch of carry out polarization direction in two beam polarised lights so that polarization side's receiving part of two beam polarised lights is received；In the reverse direction, the polarised light that light emitting members are launched is passed through using polarization beam apparatus, polarization deflection component is recycled to enter horizontal deflection to the polarised light from polarization beam apparatus, so that polarised light after the polarization deflection component deflection is located along the same line with a branch of in the incident two beam polarised lights for polarizing deflection component, transmission direction is opposite and polarization direction is identical, couples the light into corresponding optical interface finally by birefringece crystal and send.Optical transceiver provided in an embodiment of the present invention and the method for handling optical signal, only need optical interface, birefringece crystal, polarization deflection component, polarization beam apparatus, light emitting members, light-receiving member, the low damage that optical signal can be achieved is received and sent, used optical element is less, with assembling advantage easy, with low cost, simultaneously less optical element make it that corresponding optical transceiver is more compact, and volume is smaller, can meet the demand of modern communicationses device miniaturization.Below, the details of just several polarization deflection components is deployed to illustrate. As shown in figure 3, Fig. 3 provides a kind of optical transceiver, in this embodiment, polarization deflection component includes magnetic rotation luminescent crystal and half-wave plate, optionally, can include being used for the magnet ring for magnetic rotation luminescent crystal.In this embodiment, the polarization direction of the first polarised light after birefringece crystal is decomposed is the second polarization direction（Represented with the lines with short-term）, the polarization direction of the second polarised light is the first polarization direction（Represented Yong the lines of Dai Round points）, half-wave plate is used to the polarization direction of the first polarised light deflecting 45 degree, can be that clockwise deflection can also be deflection counterclockwise, magnetic rotation luminescent crystal is used to deflect 45 degree again under the influence of a magnetic field.Wherein, half-wave plate is identical with the yawing moment of magnetic rotation luminescent crystal, is clockwise or is counterclockwise, and deflection twice is total up to 90 degree.As can be seen that after the deflection twice of half-wave plate and magnetic rotation luminescent crystal, the polarization direction of the first polarised light is changed into the first polarization direction via the second polarization direction.In this embodiment, polarization deflection component does not enter horizontal deflection to the polarization direction of the second polarised light.Wherein, magnetic field required for providing magnetic rotation luminescent crystal using magnet ring is one of which embodiment, known in those skilled in the art, the mode in also many other offer magnetic fields, such as using permanent magnet, exciting current is such as utilized, herein not --- enumerate.Fig. 4, which gives, to be eliminated magnet ring in the three-dimensional side view of this embodiments of Fig. 3, Fig. 4 and specifies magnetic direction, and Fig. 4 gives light path when receiving light simultaneously.In Fig. 4, the second polarization direction is represented with the short-term of level, and the first polarization direction is represented with vertical short-term.The optical axis of the half-wave plate is located at the left side of vertical curve, and in vertical direction with 22. 5 degree angles, because the polarization direction of the first incident polarised light is horizontal direction, and the polarization direction of the first polarised light and half-wave plate optical axis are into 67. 5 degree of angles.From general knowledge known in this field it is recognised that the polarization direction for the first polarised light that will be turned over 1 35 degree, i.e. outgoing half-wave plate through the polarization direction of the polarization direction light of the polarised light of half-wave plate is the right side of vertical curve, and in vertical direction with 45 degree of angles.What deserves to be explained is, in the embodiment of the present invention, 135 degree of deflection is equivalent with 45 degree of deflection counterclockwise clockwise, therefore be also all to have deflected 45 degree counterclockwise 1 35 degree etc. of deflection clockwise, accordingly, if the angle of deflection is (X, it is also assumed that it is in reverse direction upper deflecting（180- α) degree.As can be known from Fig. 4, the first polarised light of incident magnetic rotation luminescent crystal, namely outgoing half-wave plate the first polarised light, its polarization direction be vertical direction to the right into 45 degree of angles.Again by 45 degree of angles of magnetic rotation Crystal Rotation, overlapped when the polarization direction of the first polarised light of outgoing magnetic rotation luminescent crystal is i.e. with vertical direction, also as the first polarization direction.Half-wave plate and magnetic rotation luminescent crystal do not enter horizontal deflection to the second polarised light.Fig. 5 is essentially identical with Fig. 4, and difference is to give light path when sending optical signal.Sending During optical signal, the 3rd polarised light of light emitting members transmitting is into the second polarization direction, namely horizontal direction.3rd polarised light is after magnetic rotation luminescent crystal counterclockwise deflection 45 again after the deflection of half-wave plate, its polarization direction is identical with the first polarization light polarization direction of outgoing birefringece crystal, so the 3rd polarised light can be just coupled into the optical interface by birefringece crystal, so as to send.The first polarised light of the second polarization direction is after the deflection of half-wave plate and magnetic rotation luminescent crystal in Fig. 4, polarization direction has deflected 90 degree and has been referred to as the first polarization direction, and the 3rd polarised light of the second polarization direction is after the deflection of magnetic rotation luminescent crystal and half-wave plate, its yawing moment or the second polarization direction, it is main reason is that the rotation effect of magnetic rotation luminescent crystal is nonreciprocity.When linearly polarized light passes through medium, if Jia one in media as well parallel to light the direction of propagation magnetic field, the vibration plane of light will rotate, and this magnetic rotation phenomenon is to be found first by faraday for 1845, therefore referred to as Faraday effect.The angle of this deflection is relevant with magnetic direction, dielectric thickness and dielectric material, and unrelated with the direction of propagation of light.Therefore, the polarised light that opposite direction is propagated is in the presence of Faraday effect, and the angle of its yawing moment rotation is in the same direction and equal.In other words, magnetic rotation luminescent crystal has carried out the deflection at 45 degree of angles counterclockwise for the polarization direction of the first incident polarised light, the deflection angle of the polarization direction of its pair threeth polarised light opposite with the first polarization optical transmission direction is also 45 degree counterclockwise, which results in the different polarised light of transmission direction, its angle deflected is different.

Meanwhile, exactly because the also this nonreciprocity of magnetic rotation luminescent crystal, can effectively prevent the light that light-receiving member reflects from entering optical fiber, so as to reduce crosstalk.Generally, light-receiving member is during optical signal is received, and its light received is not absolutely, to have sub-fraction light and be reflected back along original optical path, if this part light enters optical fiber together with the light that light emitting members are launched, it will cause the crosstalk of optical signal.In embodiments of the present invention, it can be seen that the polarised light of light-receiving member reflection（Reflection process will not change the polarization direction of light）For the first polarization direction, the polarization direction of this 3rd polarised light launched with light emitting members is perpendicular, it is not easy to cause crosstalk.Simultaneously, when the reflected light of the first polarization direction reversely sequentially passes through magnetic rotation luminescent crystal and half-wave plate, with Fig. 3, 4, exemplified by embodiment in 5, when the reflected light of first polarization direction passes through magnetic rotation luminescent crystal, it is 22. 5 degree that it, which is polarized, again after half-wave plate is deflected, the polarization direction of reflected light will be returned to the first polarization direction, the polarization direction of this and the first polarised light after birefringece crystal is decomposed is perpendicular, difference on this polarization direction prevents the reflected light to return to optical interface from the original optical path along the first polarised light, sent so as to which external fiber will not be coupled into, avoid reflected light and cause crosstalk. In another embodiment, as shown in fig. 6, in the embodiment, polarization deflection component includes two half-wave plates and a magnetic rotation luminescent crystal, its middle magnetic ring is optional.Wherein, in Fig. 6, the processing for the first polarised light and the 3rd polarised light is identical with Fig. 3,4,5, will not be described in detail herein.In the embodiment of fig. 6, polarization deflection component also carries out the deflection of polarization direction to the second polarised light so that the polarization direction that the second polarised light of deflection component is polarized described in outgoing is the first polarization direction.

As shown in Figure 7, wherein Fig. 7 is corresponding with Fig. 6, and the light path of left-hand component and the processing in Fig. 3,4,5 are the same in figure, in Fig. 7, polarizing deflection component also includes an optical axis on the right side of vertical curve, in vertical direction with the half-wave plate at 22. 5 degree of angles.Meeting and vertical direction during the second polarised light outgoing half-wave plate of the polarization direction on the first polarization direction, namely first polarization direction into 45 degree of angle, again by 45 degree of rotation of magnetic rotation luminescent crystal, the polarization direction of the second polarised light has been returned to the first polarization direction.And from light-receiving member, the reflected light of the second polarised light returned along original optical path, polarization direction by reflected light during magnetic rotation luminescent crystal will deflect 45 degree counterclockwise, reflection direction after deflection will be changed into the second polarization direction, that is horizontal direction, so the polarization direction for reaching the reflected light of the second polarised light of birefringece crystal is the second polarization direction, it is perpendicular that this polarizes light polarization direction with the second of birefringece crystal outgoing, so optical interface can not be returned to along the original optical path of the second polarised light, so as to avoid reflection optical crosstalk.

As shown in figure 8, in another embodiment, polarization deflection component includes magnetic rotation luminescent crystal and half-wave plate, optionally, may also include magnet ring.The polarization direction of the first polarised light after birefringence is decomposed is located on the right side of vertical curve, and in vertical direction with 45 degree of angles, and the second polarised light is located on the left of vertical curve, and in vertical direction with 45 degree of angles.In this embodiment, the deflection at 45 degree of angles counterclockwise is carried out to the polarization direction of the first polarised light merely with magnetic rotation luminescent crystal, and the deflection at 45 degree of angles clockwise is carried out to the polarization direction of the second polarised light using half-wave plate, the polarization direction of the first polarised light after deflection and the second polarised light is so allowed for all on the first polarization direction.When launching optical signal, the polarization direction of light emitting members transmitting is the 3rd polarised light of the second polarization direction, after the 45 degree of deflection counterclockwise of magnetic rotation luminescent crystal, the polarization direction of the first polarised light after just being decomposed with birefringece crystal is identical, according to the reversible principle of light path, the polarised light of the polarization direction just can be coupled into optical interface by birefringece crystal, so as to send.

As shown in figure 9, in one embodiment, polarization deflection component includes two magnetic rotation luminescent crystals, optionally, two magnet rings can be included.Fig. 9 embodiment and Fig. 8 are similar, and difference is figure The deflection to the second polarization light polarization direction is realized using half-wave plate in 8, and the deflection to the second polarization light polarization direction is realized using magnetic rotation luminescent crystal in Fig. 9.In Fig. 9 example, two magnetic rotation luminescent crystal materials are identical, but in the opposite magnetic field of magnetic direction, both yawing moment contrasts.In fact, also two magnetic rotation luminescent crystals can be positioned in same magnetic field, and the magnetic rotation luminescent crystal of unlike material is selected respectively so that one is realized deflection clockwise, and another is deflected counterclockwise.It should be noted that, in all embodiments of the invention, magnetic direction is merely illustrative, such as it can also be and direction in opposite direction in each figure, at this moment the polarization direction of each polarised light is clockwise, as long as the polarization angle of half-wave plate is also clockwise, then 90 degree of deflections of polarization light polarization direction can also be realized.For another example, it is different during the direction of the magnetic rotation Crystal Rotation of unlike material, the magnetic rotation luminescent crystal of some materials is turned clockwise by axle of magnetic direction, and the magnetic rotation luminescent crystal of some materials is using magnetic direction as axle rotate counterclockwise, therefore when magnetic direction is still direction as illustrated throughout the figures, but when the material of magnetic rotation luminescent crystal changes, it may also may require that the polarization angle of ripple half produces certain change.In a word, as long as choosing suitable half-wave plate, magnetic rotation luminescent crystal and magnetic field, it can realize and the polarization direction of the first polarization light polarization is deflected to the first polarization direction from the second polarization direction, and in the direction that shakes.

Meanwhile, the first polarised light and the second polarised light in the embodiment of the present invention after birefringece crystal is decomposed are respectively the second polarization direction and the first polarization direction, and such case is merely illustrative.In fact, no matter what kind of the polarization direction of the first polarised light after birefringece crystal is decomposed and the second polarised light is, such as may be at a certain angle with the second polarization direction and the first polarization direction respectively, the polarization direction of corresponding polarised light can be adjusted to suitable direction with half-wave plate, so that from the polarised light of half-wave plate outgoing after magnetic rotation luminescent crystal polarization, its polarization direction is the first polarization direction.On implementing, half-wave plate optical axis and the angle of corresponding polarised light need to be only adjusted to suitable angle.In addition, the front and back position of half-wave plate and magnetic rotation luminescent crystal can be exchanged, its deflection effect to light is consistent, and certainly, the optical axis direction of half-wave plate needs to do certain adjustment.The method of processing optical signal provided in an embodiment of the present invention is similar to the principle of optical transceiver, reference can be made to the explanation of optical transceiver part.Optical transceiver provided in an embodiment of the present invention and the method for handling optical signal, the deflection using the polarization spectro of birefringece crystal, polarization deflection component to polarised light, and polarization beam apparatus is to polarization direction The beam splitting of different polarised lights, optical signal can also be received by realizing while single optical interface sends optical signal.Meanwhile, optical transceiver provided in an embodiment of the present invention and the method for handling optical signal, the optical device utilized is few, and used optical device brings extra loss in addition to coupling loss, or not therefore there is low-loss advantage.The embodiment of the present invention uses less optical element, with assembling advantage easy, with low cost.Meanwhile, just because of the optical element used is less so that the processing of optical transceiver and optical signal is compacter, it can meet in communication system the need for device miniaturization.In the prior art, light-receiving member can reflect a part of optical signal, the optical signal formation interference launched light emitting members is possible to, so as to cause the crosstalk of optical signal, while the optical signal formation crosstalk that the optical signal of light emitting members transmitting may also be to receiving.The polarization direction for the polarised light that the polarization direction of the polarised light of the light-receiving member reflection of the embodiment of the present invention is launched with light emitting members is perpendicular, it is not easy to occur crosstalk.Simultaneously, polarization deflection component in the embodiment of the present invention contains magnetic rotation luminescent crystal, when the nonreciprocity of magnetic rotation luminescent crystal make it that the polarised light that light-receiving member reflects returns to birefringece crystal, because different from the polarization direction of the polarised light of original birefringece crystal outgoing, and be difficult to along original optical path coupled into optical fibres, so as to further reduce the crosstalk of signal.Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although the present invention is described in detail with reference to foregoing embodiments, it will be understood by those within the art that：It can still modify to the technical scheme described in foregoing embodiments, or carry out equivalent substitution to which part or all technical characteristic；And these modifications or replacement, the essence of appropriate technical solution is departed from the scope of various embodiments of the present invention technical scheme.

Claims

Claims

1st, a kind of optical transceiver, it is characterised in that the optical transceiver includes optical interface, birefringece crystal, polarization deflection component, polarization beam apparatus, light emitting members, light-receiving member, wherein：The optical interface, is used for and fiber coupling, receives the incident light from the optical fiber；The birefringece crystal, for by the incident light from the optical interface be decomposed into polarization direction be mutually perpendicular to, the first polarised light and the second polarised light of symport；The polarization deflection component, deflection for carrying out polarization direction at least a branch of polarised light in the first polarised light and the second polarised light of the birefringece crystal so that the polarization direction of the first polarised light and the second polarised light turns into the polarization direction of identical first；The polarization beam apparatus, the polarization direction for reflecting incidence is the first polarised light and the second polarised light of the first polarization direction；The light-receiving member, for receiving the first polarised light and the second polarised light that the polarization direction that the polarization beam apparatus is reflected is the first polarization direction；The light emitting members, for launching the 3rd polarised light that polarization direction is the second polarization direction, second polarization direction and first polarization direction are perpendicular；The polarization beam apparatus, it is additionally operable to pass through the 3rd polarised light from the light emitting members, wherein, through the 3rd polarised light of the polarization beam apparatus, it is located on the same line with the first polarised light of the incident polarization beam apparatus and transmission direction is opposite；The polarization deflection component, it is additionally operable to carry out the 3rd polarised light from the polarization beam apparatus deflection of polarization direction, wherein, the 3rd polarised light after the polarization deflection component deflection is located along the same line with the first polarised light of the incident polarization deflection component, transmission direction is opposite and polarization direction is identical；The birefringece crystal, is additionally operable to receive the 3rd polarised light from the polarization deflection component, and the 3rd polarised light received is transported into the optical interface；The optical interface, is additionally operable to the 3rd polarised light from the birefringece crystal transporting to the optical fiber. 2nd, optical transceiver according to claim 1, it is characterised in that：The polarization deflection component includes magnetic rotation luminescent crystal, and the magnetic rotation luminescent crystal is used for the deflection at polarization direction 45 degree of angles of progress of polarised light under the influence of a magnetic field to the incident magnetic rotation luminescent crystal.

3rd, optical transceiver according to claim 2, it is characterised in that：The polarization deflection component also includes half-wave plate, and the half-wave plate is used to enter horizontal deflection to the polarization direction of the polarised light of the incident half-wave plate.

4th, optical transceiver according to claim 3, it is characterised in that：The polarization deflection component specifically includes the first magnetic rotation luminescent crystal and the first half-wave plate；First half-wave plate is used to enter horizontal deflection to the polarization direction of the first polarised light from the birefringece crystal, the first magnetic rotation luminescent crystal is used in the presence of the first magnetic field, 45 degree of deflections are carried out again to the polarization direction of the first polarised light after first half-wave plate deflection, and the first polarised light after first half-wave plate and the first magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the first polarised light after first half-wave plate and the first magnetic rotation luminescent crystal deflection is first polarization direction；The first magnetic rotation luminescent crystal is additionally operable in the presence of first magnetic field, 45 degree of deflections are carried out for the polarization direction of the 3rd polarised light of the second polarization direction to the polarization direction from the polarization beam apparatus, first half-wave plate is additionally operable to enter the polarization direction of the 3rd polarised light after the first magnetic rotation luminescent crystal deflection again horizontal deflection, and the 3rd polarised light after the first magnetic rotation luminescent crystal and first half-wave plate deflection is transported into the birefringece crystal.

5th, the optical transceiver according to claim requirement 4, it is characterised in that：The polarization deflection component specifically also includes the second half-wave plate；Second half-wave plate is used to enter horizontal deflection to the polarization direction of the second polarised light from the birefringece crystal, the first magnetic rotation luminescent crystal is additionally operable in the presence of first magnetic field, 45 degree of deflections are carried out again to the polarization direction of the second polarised light after second half-wave plate deflection, and the second polarised light after second half-wave plate and the first magnetic rotation luminescent crystal deflection is transported into the polarization beam splitting Device, wherein, the polarization direction of the second polarised light after second half-wave plate and the first magnetic rotation luminescent crystal deflection is first polarization direction.

6th, the optical transceiver according to claim requirement 3, it is characterised in that：The polarization deflection component specifically includes the second magnetic rotation luminescent crystal and the 3rd half-wave plate；The second magnetic rotation luminescent crystal is used in the presence of the second magnetic field, 45 degree of deflections are carried out to the polarization direction of the first polarised light from the birefringece crystal, 3rd half-wave plate is used to enter horizontal deflection again to the polarization direction of the first polarised light after the second magnetic rotation luminescent crystal deflection, and the first polarised light after the second magnetic rotation luminescent crystal and the 3rd half-wave plate deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the first polarised light after the second magnetic rotation luminescent crystal and the 3rd half-wave plate deflection is first polarization direction；

To the polarization direction of the 3rd polarised light enter horizontal deflection, the second magnetic rotation luminescent crystal is additionally operable in the presence of second magnetic field, and 45 degree of deflections are carried out again to the polarization direction of the 3rd polarised light after the 3rd half-wave plate deflection.

7th, optical transceiver according to claim 6, it is characterised in that：The polarization deflection component specifically also includes the 4th half-wave plate；The second magnetic rotation luminescent crystal is additionally operable in the presence of second magnetic field, 45 degree of deflections are carried out to the polarization direction of the second polarised light from the birefringece crystal, 4th half-wave plate is additionally operable to enter horizontal deflection again to the polarization direction of the second polarised light after the second magnetic rotation luminescent crystal deflection, and the second polarised light after the second magnetic rotation luminescent crystal and the 4th half-wave plate deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the second polarised light after the second magnetic rotation luminescent crystal and the 4th half-wave plate deflection is first polarization direction.

8th, optical transceiver according to claim 2, it is characterised in that：The polarization deflection component specifically includes the 3rd magnetic rotation luminescent crystal and the 4th magnetic rotation luminescent crystal；The 3rd magnetic rotation luminescent crystal is used for the polarization side to the first polarised light from the birefringece crystal Deflected to carrying out 45 degree, and the first polarised light after the 3rd magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the first polarised light after the 3rd magnetic rotation luminescent crystal deflection is first polarization direction；It is additionally operable to carry out 45 degree of deflections to the polarization direction from the polarization beam apparatus for the polarization direction of the 3rd polarised light of the second polarization direction；The 4th magnetic rotation luminescent crystal is used to carry out the polarization direction of the second polarised light from the birefringece crystal 45 degree of deflections, and the second polarised light after the 4th magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the second polarised light after the 4th magnetic rotation luminescent crystal deflection is first polarization direction.

9th, optical transceiver according to claim 3, it is characterised in that：The polarization deflection component specifically includes the 5th magnetic rotation luminescent crystal and the 5th half-wave plate；The 5th magnetic rotation luminescent crystal is used to carry out the polarization direction of the first polarised light from the birefringece crystal 45 degree of deflections, and the first polarised light after the 5th magnetic rotation luminescent crystal deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the first polarised light after the 5th magnetic rotation luminescent crystal deflection is first polarization direction；It is additionally operable to carry out 45 degree of deflections to the polarization direction from the polarization beam apparatus for the polarization direction of the 3rd polarised light of the second polarization direction；5th half-wave plate is used to carry out the polarization direction of the second polarised light from the birefringece crystal 45 degree of deflections, and the second polarised light after the 5th half-wave plate deflection is transported into the polarization beam apparatus, wherein, the polarization direction of the second polarised light after the 5th half-wave plate deflection is first polarization direction.

10th, optical transceiver according to claim 2, it is characterised in that：The polarization deflection component also includes magnet ring, and the magnet ring is used to provide magnetic field for magnetic rotation luminescent crystal.

11st, the optical transceiver according to any one of claim 1 to 10, it is characterised in that：The light emitting members are the light emitting devices for launching single-wavelength light；Or, the light emitting members include the light emitting devices for being used to launch multiple wavelength lights, and for converging the multiplex device of multiple wavelength lights； The light-receiving member is the light receiving element for receiving single-wavelength light；Or, the light-receiving member includes multiple light receiving elements for being used to receive single-wavelength light, and the wave-dividing device for the light of each wavelength in separately multiple wavelength lights.

12nd, a kind of method for handling optical signal, it is characterised in that methods described includes：Using birefringece crystal by the incident light that optical interface is received resolve into polarization direction be mutually perpendicular to, the first polarised light and the second polarised light of symport；Using polarize deflection component in the first polarised light and the second polarised light of the birefringece crystal at least a branch of polarised light carry out polarization direction deflection so that the polarization direction of the first polarised light and the second polarised light turn into the polarization direction of identical first；The first polarised light and the second polarised light from the polarization deflection component are reflected using polarization beam apparatus；The first polarised light and the second polarised light from the polarization beam apparatus are received using light-receiving member；Using the polarization beam apparatus through the 3rd polarised light that polarization direction is the second polarization direction, second polarization direction and first polarization direction are perpendicular；The deflection of polarization direction is carried out to the 3rd polarised light from the polarization beam apparatus using the polarization deflection component, wherein, the 3rd polarised light after the polarization deflection component deflection is located along the same line with the first polarised light of the incident polarization deflection component, transmission direction is opposite and polarization direction is identical；The 3rd polarised light from polarization deflection component is received using the birefringece crystal, and the 3rd polarised light received is transported into the optical interface.

13, according to claim 12 methods described, it is characterised in that：It is described using polarize deflection component in the first polarised light and the second polarised light of the birefringece crystal at least a branch of polarised light carry out polarization direction deflection, so that the polarization direction of the first polarised light and the second polarised light turns into the polarization direction of identical first, including：Using the magnetic rotation luminescent crystal and half-wave plate polarized in deflection component to from the birefringece crystal At least a branch of polarised light in one polarised light and the second polarised light carries out the deflection of polarization direction, so that the polarization direction of the first polarised light and the second polarised light turns into the polarization direction of identical first, wherein, the magnetic rotation luminescent crystal is 45 degree to the deflection angle of the polarization direction of the polarised light of the incident magnetic rotation luminescent crystal.