An optical transceiver device

Abstract

The embodiment of the present application provides an optical transceiver device, which comprises: an optical collimation unit, used for receiving an optical signal, performing optical collimation processing on the optical signal, and sending the optical collimation-processed optical signal to an optical processing unit; the optical processing unit is connected with the optical emission unit, and at least comprises a thin film band-pass filter, the thin film band-pass filter is a dense wavelength division multiplexing optical thin film band-pass filter; the optical processing unit is used for filtering the optical collimation-processed optical signal through the thin film band-pass filter to obtain a filtered signal; and an optical receiving unit is connected with the optical processing unit, used for receiving the filtered signal and converting the filtered signal into an electrical signal.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of optical communication technology, and relate to but are not limited to an optical transceiver device. BACKGROUND

[0002] With the rapid development of Internet services and the explosive growth of data traffic, data center optical interconnection has gradually developed into a research hotspot in optical communication. The explosive growth of communication capacity forces optical interconnection modules to develop towards high speed and large capacity. High-speed parallel optical transmission modules or devices have the characteristics of large communication capacity, low energy consumption and miniaturization, and are increasingly widely used in data centers.

[0003] Wavelength Division Multiplexer (WDM) technology has always been the mainstream direction of parallel optical transmission technology. In the field of high-speed optical modules for optical communication, coarse wavelength division multiplexer (Coarse Wavelength Division Multiplexer, CWDM) / local area network wavelength division multiplexer (Local Area Network Wavelength Division Multiplexer, LAN WDM) high-speed parallel optical transmission devices packaged using coarse / fine wavelength division multiplexing / demultiplexing technology are particularly common.

[0004] However, high-speed parallel optical transmission devices based on Dense Wavelength Division Multiplexing (DWDM) have been rarely reported on the market, and the traditional coarse / fine wavelength division multiplexing / demultiplexing technical solution is no longer suitable for the packaging of high-speed parallel DWDM optical transmission devices. SUMMARY

[0005] Based on the problems in the related art, embodiments of the present application provide an optical transceiver device.

[0006] The technical solution of the embodiments of the present application is implemented as follows:

[0007] The embodiments of the present application provide an optical transceiver device, which comprises:

[0008] An optical collimation unit is configured to receive an optical signal, perform optical collimation processing on the optical signal, and send the optical collimation-processed optical signal to an optical processing unit.

[0009] The optical processing unit is connected to the optical transmitting unit, and the optical processing unit comprises at least a thin film bandpass filter, which is a dense wavelength division multiplexed optical thin film bandpass filter.

[0010] The light processing unit is configured to filter the light collimated processed light signal through the thin film band-pass filter to obtain a filtered signal.

[0011] The light receiving unit is connected with the light processing unit and configured to receive the filtered signal and convert the filtered signal into an electrical signal.

[0012] In some embodiments, the light collimating unit comprises an incident optical fiber and a collimating lens corresponding to the incident optical fiber; the incident optical fiber is configured to emit the light signal to the collimating lens; and the collimating lens is configured to perform the light collimating process on the light signal and send the light collimated processed light signal to the light processing unit.

[0013] In some embodiments, the light collimating unit comprises at least two lasers and one collimating lens corresponding to each laser; each laser corresponds to an incident wavelength.

[0014] Each laser is configured to emit a light signal of the corresponding incident wavelength to the collimating lens.

[0015] Each collimating lens is configured to perform the light collimating process on the light signal of the corresponding incident wavelength and send the light collimated processed light signal to the light processing unit.

[0016] In some embodiments, the light processing unit further comprises a polarization processing unit; the polarization processing unit comprises at least a polarization conversion unit, a first polarization beam splitter, and a non-reciprocal polarization rotator.

[0017] The polarization conversion unit is configured to receive the light collimated processed light signal and decompose the light collimated processed light signal into two parallel sub-beams with the same polarization state.

[0018] The first polarization beam splitter is configured to deflect the propagation direction of the two sub-beams and forward the deflected two sub-beams into the non-reciprocal polarization rotator to obtain two symmetrical sub-beams.

[0019] The thin film band-pass filter is configured to filter the two symmetrical sub-beams to obtain two first filtered signals with a first preset wavelength and a mixed filtered signal with a different wavelength from the first filtered signal; and the first filtered signal constitutes the filtered signal.

[0020] In some embodiments, the light processing unit further comprises a quarter-wave plate and a plane mirror.

[0021] The thin-film band-pass filter is further configured to reflect the mixed filtered signal, so that the mixed filtered signal reversely passes through the non-reciprocal polarization rotator, and the non-reciprocal polarization rotator is configured to change the polarization direction of the mixed filtered signal to form a first polarization filtered signal.

[0022] The first polarization beam splitter is configured to make the first polarization filtered signal enter the quarter-wave plate and the plane mirror.

[0023] The plane mirror is configured to reflect the first polarization filtered signal, so that the reflected first polarization filtered signal is directed to the quarter-wave plate, and the quarter-wave plate is configured to change the polarization direction of the reflected first polarization filtered signal to form a second polarization filtered signal.

[0024] The first polarization beam splitter is further configured to deflect the propagation direction of the second polarization filtered signal, so that the deflected second polarization filtered signal is directly incident on the non-reciprocal polarization rotator and enters the thin-film band-pass filter.

[0025] The thin-film band-pass filter is further configured to filter the second polarization filtered signal to obtain two second filtered signals having a second preset wavelength and a residual filtered signal; and the first filtered signal and the second filtered signal constitute the filtered signal.

[0026] In some embodiments, the polarization conversion unit includes a second polarization beam splitter and a half-wave plate.

[0027] The second polarization beam splitter is configured to receive the collimated optical signal and decompose the collimated optical signal into orthogonally polarized ordinary light and extraordinary light.

[0028] The half-wave plate is configured to perform polarization conversion on the extraordinary light to obtain polarization-converted ordinary light; and the ordinary light and the polarization-converted ordinary light constitute the two parallel sub-beams having the same polarization state.

[0029] In some embodiments, the polarization conversion unit includes a second polarization beam splitter and a half-wave plate.

[0030] The second polarization beam splitter is configured to receive the collimated optical signal and decompose the collimated optical signal into orthogonally polarized ordinary light and extraordinary light.

[0031] The half-wave plate is further configured to perform polarization conversion on the ordinary light to obtain polarization-converted extraordinary light; and the extraordinary light and the polarization-converted extraordinary light constitute the two parallel sub-beams having the same polarization state.

[0032] In some embodiments, the polarization conversion unit is further configured to polarization combine the two beams of the first filtered signals and the two beams of the second filtered signals respectively, to form a first collimated light beam having the first preset wavelength and a second collimated light beam having the second preset wavelength.

[0033] In some embodiments, the light receiving unit comprises at least one light receiving detector and a converging lens corresponding to each light receiving detector, each light receiving detector corresponding to a receiving wavelength.

[0034] The converging lens is configured to converge the first collimated light beam and the second collimated light beam respectively, to obtain a converged first collimated light beam and a converged second collimated light beam.

[0035] The light receiving detector corresponding to the first preset wavelength is configured to receive the converged first collimated light beam.

[0036] The light receiving detector corresponding to the second preset wavelength is configured to receive the converged second collimated light beam.

[0037] In some embodiments, the first polarization beam splitter is further configured to transmit the remaining filtered signals.

[0038] The optical transceiver provided by the embodiments of the present application comprises an optical collimating unit, an optical processing unit and a light receiving unit. The optical collimating unit is configured to receive an optical signal, perform optical collimation processing on the optical signal, and transmit the optical collimation-processed optical signal to the optical processing unit. The optical processing unit is connected with the optical transmitting unit. The optical processing unit comprises at least a thin film bandpass filter. The thin film bandpass filter is a dense wavelength division multiplexing optical thin film bandpass filter. The optical processing unit is configured to filter the optical collimation-processed optical signal through the thin film bandpass filter, to obtain a filtered signal. The light receiving unit is configured to receive the filtered signal and convert the filtered signal into an electrical signal. Connection Thus, the optical processing unit provided by the embodiments of the present application filters the optical signal through the dense wavelength division multiplexing optical thin film bandpass filter, so that the optical transceiver provided by the embodiments of the present application has a compact optical path, and solves the problem of miniaturized packaging of the dense wavelength division multiplexing optical transmission device. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 FIG. 1 is a schematic diagram of a composition structure of an optical transceiver provided by the embodiments of the present application;

[0040] Figure 2 FIG. 2 is a schematic diagram of a composition structure of a 4-way parallel optical transceiver provided by the embodiments of the present application;

[0041] Figure 3is a schematic diagram of a component structure of a 4-way parallel optical transceiver device provided by an embodiment of the present application;

[0042] Figure 4 is a schematic diagram of a component structure of a 4-way parallel optical transceiver device provided by an embodiment of the present application;

[0043] Reference signs:

[0044] 101 - optical collimation unit; 102 - optical processing unit; 1021 - thin film bandpass filter; 103 - optical receiving unit; 201 - incident optical fiber; 202 - collimation lens; 203 - polarization conversion unit; 2031 - second polarization beam splitter; 2032 - half wave plate; 204 - first polarization beam splitter; S202 to S205 - cemented light splitting surface; S201 - high reflection surface; S206 to S213 - anti-reflection light transmitting surface; 205 - non-reciprocal polarization rotator; 206 - thin film bandpass filter; 207 - quarter wave plate; 208 - plane mirror; 209 - optical receiving detector array; 209-1 to 209-4 - optical receiving detector; 210 - converging lens array; 210-1 to 210-4 - converging lens; 301 - incident optical fiber; 302 - collimation lens; 303 - polarization conversion unit; 3031 - second polarization beam splitter; 3032 - half wave plate; 304 - first polarization beam splitter; S302 to S305 - cemented light splitting surface; S301 and S306 - high reflection surface; S307 to S315 - anti-reflection light transmitting surface; 305 - non-reciprocal polarization rotator; 306 - optical thin film bandpass filter array; 307 - quarter wave plate; 308 - plane mirror; 309 - optical receiving detector array; 309-1 to 309-4 - optical receiving detector; 310 - converging lens array; 310-1 to 310-4 - converging lens; 401 - laser array; 401-1 to 401-4 - laser; 402 - collimation lens; 402-1 to 402-4 - collimation lens unit array; 403 - optical thin film bandpass filter array; 404 - Faraday rotator; 405 - half wave plate; 406 - first polarization beam combiner; S402 to S404 - cemented light splitting surface; S401 and S405 - high reflection surface; S406 to S411 - anti-reflection light transmitting surface; 407 - quarter wave plate; 408 - plane mirror; 409 - converging lens; 410 - optical output fiber. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described in further detail below with reference to the drawings, and the described embodiments should not be regarded as limiting the present application, and all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0046] In the following description, reference is made to "some embodiments", which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets as each other and as other subsets of all possible embodiments, and can be combined with each other, unless otherwise noted. Unless otherwise defined, all technical and scientific terms used in the application embodiments have the same meaning as those commonly understood by one of ordinary skill in the art to which the application embodiments belong. The terms used in the application embodiments are only for the purpose of describing the application embodiments and are not intended to limit the application.

[0047] In the related art, the size of the DWDM arrayed waveguide grating (AWG) is large, which cannot meet the requirement of miniaturization of high-speed parallel optical devices for optical modules. Affected by technical problems such as polarization-dependent bandwidth effect, polarization sensitivity of center wavelength and insertion loss, the range of incident angles that can be used by the DWDM optical thin film filter of the traditional technology is very limited, and the commonly used Z-BLOCK wave division scheme of the medium thin film filter (TFF) is no longer applicable to the packaging of miniaturized parallel optical transceiver devices.

[0048] Based on the problems in the related art, the application embodiments provide an optical transceiver device, which includes an optical collimation unit, an optical processing unit and an optical receiving unit. The optical processing unit with a dense wavelength division multiplexing optical thin film bandpass filter is used to filter the optical signal, so that the optical path of the optical transceiver device provided by the application embodiments is compact, and the miniaturized packaging problem of the dense wavelength division multiplexing optical transmission device is solved.

[0049] Figure 1 is a schematic diagram of a composition structure of an optical transceiver device provided by the application embodiments, as Figure 1 shown, the optical transceiver device 10 includes an optical collimation unit 101, an optical processing unit 102 and an optical receiving unit 103, wherein the optical collimation unit 101 is used to receive an optical signal, perform optical collimation processing on the optical signal, and send the optical collimation-processed optical signal to the optical processing unit 102; the optical processing unit 102 is connected with the optical collimation unit 101, and the optical processing unit 102 at least includes a thin film bandpass filter 1021, and the thin film bandpass filter 1021 is a dense wavelength division multiplexing optical thin film bandpass filter; the optical processing unit 102 is used to filter the optical collimation-processed optical signal through the thin film bandpass filter 1021 to obtain a filtered signal; the optical receiving unit 103 is connected with the optical processing unit 102, and is used to receive the filtered signal and convert the filtered signal into an electrical signal.

[0050] The optical processing unit with the dense wavelength division multiplexing optical thin film band pass filter filters the optical signal, so that the optical transceiver device provided by the embodiment has a compact optical path, and the problem of miniaturized packaging of the dense wavelength division multiplexing optical transmission device is solved.

[0051] Based on the foregoing embodiments, Figure 2 is a schematic structural diagram of a 4-way parallel optical transceiver device provided by the embodiment, Figure 2 The optical transceiver device can be an optical receiver device, such as Figure 2 As shown, the optical collimation unit can include an incident optical fiber 201 and a collimation lens 202 corresponding to the incident optical fiber 201, wherein the incident optical fiber 201 is used to emit an optical signal to the collimation lens 202, the collimation lens 202 is used to perform optical collimation processing on the optical signal, and the optical collimation processing is performed on the optical signal. The optical signal after processing is sent to the optical processing unit.

[0052] In some embodiments, the optical processing unit further includes a polarization processing unit, and the polarization processing unit at least includes a polarization conversion unit 203, a first polarization beam splitter 204, and a non-reciprocal polarization rotator 205 (which is a Faraday rotator 2051 and a half-wave plate 2052). Wherein, the polarization conversion unit 203 is used to receive the optical collimation processing optical signal, and decompose the optical collimation processing optical signal into two sub-beams with the same polarization state and parallel; the first polarization beam splitter 204 is used to deflect the propagation direction of the two sub-beams, and the deflected two sub-beams are injected into the non-reciprocal polarization rotator 205 in a positive direction, to obtain two symmetric sub-beams; the thin film band pass filter 206 is used to filter the two symmetric sub-beams, to obtain two first filtered signals with a first preset wavelength, and a mixed filtered signal with a different wavelength from the first filtered signal.

[0053] In some embodiments, the light processing unit further comprises a quarter wave plate 207 and a plane mirror 208; the thin film band pass filter 206 is further configured to reflect the mixed filtered signal, so that the mixed filtered signal passes through the non-reciprocal polarization rotator 205 in a reverse direction, the non-reciprocal polarization rotator 205 is configured to change the polarization direction of the mixed filtered signal to form a first polarization filtered signal; the first polarization filtered signal is made to enter the quarter wave plate 207 and the plane mirror 208 through the first polarization beam splitter 204; the plane mirror 208 is configured to reflect the first polarization filtered signal, so that the reflected first polarization filtered signal is made to enter the quarter wave plate 207, the quarter wave plate is configured to change the polarization direction of the reflected first polarization filtered signal to form a second polarization filtered signal; the first polarization beam splitter 204 is further configured to deflect the propagation direction of the second polarization filtered signal, so that the deflected second polarization filtered signal enters the non-reciprocal polarization rotator 205 in a forward direction and enters the thin film band pass filter 206; the thin film band pass filter 206 is further configured to filter the second polarization filtered signal to obtain two second filtered signals having a second preset wavelength and a residual filtered signal; wherein the first filtered signal and the second filtered signal constitute the filtered signal.

[0054] In some embodiments, the polarization conversion unit 203 is further configured to polarization combine the two first filtered signals and the two second filtered signals respectively to form a first collimated light beam having a first preset wavelength and a second collimated light beam having a second preset wavelength.

[0055] In some embodiments, the light receiving unit comprises at least one light receiving detector 209 and a converging lens 210 corresponding to each light receiving detector 209, each light receiving detector 209 corresponds to a receiving wavelength; the converging lens 210 is configured to converge the first collimated light beam and the second collimated light beam respectively to obtain a converged first collimated light beam and a converged second collimated light beam; a light receiving detector 209-1 corresponding to the first preset wavelength is configured to receive the converged first collimated light beam; a light receiving detector 209-2 corresponding to the second preset wavelength is configured to receive the converged second collimated light beam.

[0056] It should be noted that the embodiments of the present application can receive light signals of different arm lengths through light receiving detectors corresponding to different wavelengths, as shown in Figure 2 The embodiments of the present application can receive light signals of wavelengths λ1 to λ4 through four light receiving detectors (e.g., 209-1 to 209-4).

[0057] In some embodiments, the optical transceiver device provided by the embodiments of the present application can be regarded as being composed of four functional modules. The first functional module is a fiber collimation coupling module, which includes an incident fiber 201 and a collimation lens 202. The second functional module is a polarization processing module, which includes a second polarization beam splitter 2031 and a polarization conversion unit 203 composed of a set of half wave plates (HWP) 2032, a first polarization beam splitter 204, a non-reciprocal polarization rotator 205, and a quarter-wave plate (QWP) 207. The third functional module is an optical filtering functional unit, which includes a plane mirror 208 and an optical thin film bandpass filter array 206. The fourth functional module is an optical detection module, which includes an optical receiving detector array 209 and a converging lens array 210.

[0058] In some embodiments, the first polarization beam splitter 204 is further used for transmitting an outgoing remaining filtered signal. Figure 2 In some embodiments, the remaining filtered signal with a wavelength other than λ1 to λ4 is transmitted out through the anti-reflection surface S213 of the first polarization beam splitter 204.

[0059] In some embodiments, the polarization conversion unit 203 includes the second polarization beam splitter 2031 and the half wave plate 2032. The second polarization beam splitter 2031 is used to receive the collimated optical signal and decompose the collimated optical signal into orthogonally polarized ordinary light and extraordinary light. The half wave plate 2032 is used to perform polarization conversion processing on the extraordinary light to obtain converted ordinary light. The ordinary light and the converted ordinary light constitute two parallel sub-beams with the same polarization state.

[0060] In some embodiments, the polarization conversion unit 203 can decompose and convert the incident light with a random polarization state into two linearly polarized beams with the same polarization state, and can also synthesize two linearly polarized beams with the same polarization state into one beam. The second polarization beam splitter 2031 is an optical element for separating linearly polarized beams. Orthogonally polarized beams are transmitted along different optical paths in the second polarization beam splitter 2031. The second polarization beam splitter 2031 can be realized by a polarization beam splitting birefringent crystal with an optical axis parallel to the optical ray main section of the embodiments of the present application.

[0061] In some embodiments, the non-polarized input light enters from the input fiber 201, is collimated by the collimating lens 202, and then enters the birefringent crystal, which decomposes the light into orthogonally polarized ordinary light (S-polarization: the direction of electric field vibration is perpendicular to the incident plane) and extraordinary light (P-polarization: the direction of electric field vibration is parallel to the incident plane) in the main section, and then exits the crystal in parallel with a certain spatial interval. The optical axis of the half-wave plate 2032 is at a 45° angle with the main plane formed by the optical axis of the second polarizing beam splitter 2031 and the light rays. After the linearly polarized light beam passes through the half-wave plate 2032, the polarization is converted, and the P-polarization incident can be converted into S-polarization, and the S-polarization incident can be converted into P-polarization.

[0062] In some embodiments, the half-wave plate 2032 is a set of half-wave plates, as shown in Figure 2 2032-1 to 2032-5.

[0063] In some embodiments, the first polarizing beam splitter 204 includes a plurality of polarizing beam splitting cemented light splitting surfaces (as shown in Figure 2 S202 to S205), one high-reflection surface (as shown in Figure 2 S201), and a plurality of anti-reflection light transmitting surfaces (as shown in Figure 2 S206 to S213). Among them, the cemented light splitting surfaces S202 to S205 are parallel to each other, and the high-reflection surface S201 is perpendicular to them in the main section of the light rays. The cemented light splitting surfaces S202 to S205 are coated with a polarizing beam splitting medium film, which is preferably arranged at a 45° angle, and the cemented light splitting surfaces S202 to S205 transmit P-polarized light and totally reflect S-polarized light. The high-reflection surface S201 totally reflects light of all wavelengths, and the reflected light remains essentially unchanged in polarization state relative to the incident light.

[0064] In some embodiments, the non-reciprocal polarization rotator 205 uses the Faraday optical rotation effect of magneto-optical materials to keep the polarization direction of the linearly polarized light unchanged when it passes in the forward direction, and converts the linearly polarized light into linearly polarized light with an orthogonal polarization state when it passes in the reverse direction.

[0065] In some embodiments, the non-isotropic polarization rotator 205 comprises a Faraday rotator and a half-wave plate. Specifically, 2051 is a Faraday rotator capable of rotating the linear polarization direction clockwise (observed against the direction of the beam directed towards the photodetector module) by 45°, and 2052 is a half-wave plate whose optical axis forms a 67.5° angle with the principal plane formed by the light rays and optical axis of the second polarization beam splitter 2031; or 2051 is a Faraday rotator capable of rotating the linear polarization direction counterclockwise (observed against the direction of the beam directed towards the photodetector module) by 45°, and 2052 is a half-wave plate whose optical axis forms a 67.5° angle with the principal plane formed by the light rays and optical axis of the second polarization beam splitter 2031. The optical axis of the beam splitter 2051 forms a 22.5° angle with the principal plane formed by the light rays and the optical axis of the second polarizing beam splitter 2031; or 2052 is a Faraday rotator that can rotate the linear polarization direction counterclockwise (observed against the direction of the beam directed towards the optical detection module) by 45°; or 2051 is a half-wave plate with the optical axis forming a 22.5° angle with the principal plane formed by the light rays and the optical axis of the second polarizing beam splitter 2031; 2052 is a Faraday rotator that can rotate the linear polarization direction clockwise by 45°.

[0066] In some embodiments, the optical thin-film bandpass filter array 206 is composed of multiple units, such as... Figure 2 In sections 206-1 to 206-4, each unit filter corresponds to the cemented beam-splitting surface of the first polarization beam splitter 204. Each unit filter receives two sub-beams of the same polarization incident at a small angle, transmitting wavelengths within the corresponding channel and reflecting wavelengths outside the channel. For example... Figure 2 As shown, the two sub-beams in the S-polarization state are symmetrically incident on the physical center 206 of the optical thin-film bandpass filter, eliminating the influence of the non-uniformity of the optical thin film surface on the polarization-dependent loss (PDL). Therefore, the optical thin-film bandpass filter array 206 can be directly composed of conventional DWDM filters. Each unit filter of the optical thin-film bandpass filter array 206 has a different filter band, and the center wavelength (λ1 to λ4) of the transmission band corresponds to the output wavelength of the transmitting end of the optical transceiver device in this embodiment. The bandpass filter array 206 can be disposed between the non-isotropic polarization rotator 205 and the polarization conversion unit 203, or between the second polarization beam splitter 2031 and the converging lens array 210.

[0067] In some embodiments, the highly reflective surface of the plane mirror 208 is coated with a single-polarization high-reflection film, which reflects all wavelengths of light, and the polarization state of the reflected light remains basically unchanged relative to the incident light.

[0068] In some embodiments, the light-receiving detector array 209 is an array of multiple discrete detector chips or an array of a single detector chip with multiple detector units. The detector units of the light-receiving detector array 209 correspond to the filter units of the band-pass filter array 206 one-to-one and are arranged in sequence on the back focal plane of the converging lens array 210 for receiving light signals of different wavelengths transmitted by the different filter units.

[0069] In some embodiments, each lens unit of the converging lens array 210 corresponds to a detector unit of the light-receiving detector array 209 one-to-one. The light signals of different wavelengths transmitted by the different filter units of the band-pass filter array 206 are converged by the corresponding lens units of the converging lens array 210 to the corresponding detector units of the light-receiving detector array 209.

[0070] The working principle of the optical receiver device provided in the embodiments of the present application will be described in detail below with reference to the optical schematic diagram of a 4-way parallel optical receiver shown in Figure 2 The arbitrary-polarization light signal containing multiple optical channels of λ1 to λ4 is emitted from the incident fiber 201, collimated by the lens 202, and incident to the polarization conversion unit 203. The polarization conversion unit 203 decomposes the incident light signal into two parallel sub-beams having the same S-polarization state (i.e., ordinary light) and spatially separated. The sub-beams pass through the anti-reflection surface S206 of the first polarization beam splitter 204, are totally reflected on the high-reflection surface S201, the transmission direction is reversed, and are projected on the polarization splitting surface S202 of the first polarization beam splitter 204. The polarization splitting surface S202 reflects the sub-beams of the S-polarization state, and the transmission direction of the sub-beams is reversed again. The reversed beams pass through the anti-reflection surface S206 again, are emitted along the direction of the first time passing through the anti-reflection surface S206, and pass through the non-reciprocal polarization rotator 205 in the forward direction. The two sub-beams of the S-polarization pass through the non-reciprocal polarization rotator 205 in the forward direction without change in the polarization state and symmetrically incident to the physical center of the unit filter 206-1 of the optical thin-film band-pass filter array 206. The unit filter 206-1 transmits the optical wave signals in the λ1 channel and reflects the optical wave signals outside the λ1 channel.

[0071] In the embodiments of the present application, the two optical wave signals of the λ1 channel with the fixed positional relationship transmitted from the unit filter 206-1 continue to transmit, are polarization combined by the polarization conversion unit 203, and form a collimated beam. The collimated beam is converged by the corresponding lens unit 210-1 of the converging lens array, and finally the optical wave signals of the λ1 channel are received by the detector unit 209-1 of the light-receiving detector array.

[0072] In the embodiment of the present application, the light wave signals of the channels other than the λ1 channel reflected from the unit filter 206-1 become P-polarized light again after passing through the non-reciprocal polarization rotator 205 in reverse, and then are incident on the polarization splitting surface S202 of the first polarization beam splitter 204 again. The P-polarized light wave signals of the channels other than the λ1 channel directly transmit through the polarization splitting surface S202, and are directed to the quarter-wave plate 207 and the plane mirror 208. The light wave signals reflected from the plane mirror 208 are converted into S-polarized light after passing through the quarter-wave plate 207 again, and are reflected by the polarization splitting surface S202 of the first polarization beam splitter 204 to be directed to the splitting surface S203 of the first polarization beam splitter 204.

[0073] In the embodiment of the present application, the two light wave signals of the λ2 channel with the fixed positional relationship transmitted from the unit filter 206-2 continue to transmit, are polarization-converted and combined by the polarization conversion unit, and form a collimated light beam. The collimated light beam is converged by the corresponding lens unit 210-2 of the converging lens array, and finally the light wave signals of the λ2 channel are received by the detection unit 209-2 of the light-receiving detector array.

[0074] In the embodiment of the present application, the light wave signals of the channels other than the λ1 and λ2 channels reflected from the unit filter 206-2 become P-polarized light again after passing through the non-reciprocal polarization rotator 205 in reverse, and then are incident on the polarization splitting surface S203 of the first polarization beam splitter 204 again. The P-polarized light wave signals of the channels other than the λ1 and λ2 channels directly transmit through the polarization splitting surface S203, and are directed to the quarter-wave plate 207 and the plane mirror 208. The light wave signals reflected from the plane mirror 208 are converted into S-polarized light after passing through the quarter-wave plate 207 again, and are reflected by the polarization splitting surface S203 of the first polarization beam splitter 204 to be directed to the splitting surface S204 of the first polarization beam splitter 204.

[0075] In the embodiment of the present application, the light paths of the light wave signals propagate in the above-mentioned regular manner, and the light wave signals pass through the non-reciprocal polarization rotator 205, the first polarization beam splitter 204, the quarter-wave plate 207, the plane mirror 208, the polarization conversion unit 203 and the plurality of unit filters 206 multiple times. The light wave signals of the λ3 and λ4 channels are finally received by the detection units 209-3 and 209-4 of the light-receiving detector array 209, respectively, and the light wave signals of the channels other than the λ1 to λ4 channels are transmitted out through the antireflection surface S213 of the first polarization beam splitter 204.

[0076] Based on the foregoing embodiments, the embodiments of the present application further provide an optical transceiver device, wherein the second polarization beam splitter 2031 is configured to receive the collimated optical signal and split the collimated optical signal into ordinary light and extraordinary light with orthogonal polarizations, and the half-wave plate 3032 is further configured to perform polarization conversion on the ordinary light to obtain converted extraordinary light. The extraordinary light and the converted extraordinary light constitute two parallel sub-beams with the same polarization state.

[0077] As shown in FIG. 4, Figure 3 Figure 3 is a schematic diagram of a 4-way parallel optical transceiver device provided by the embodiments of the present application. The optical transceiver device provided by the embodiments of the present application is different from the optical transceiver device in the foregoing embodiments in that the half-wave plate 3032 is opposite to the S-polarization state sub-beam position of the second polarization beam splitter 3031 in the embodiments of the present application.

[0078] As shown in FIG. 5, the first polarization beam splitter 304 includes a plurality of polarization beam splitting cemented optical surfaces (S302-S305), two high-reflection surfaces (S301 and S306) perpendicular to each other in the main section of the light, and a plurality of anti-reflection optical surfaces (S307-S315). The cemented optical surfaces are parallel to each other and perpendicular to the high-reflection surface S301 in the main section of the light. The cemented optical surfaces are coated with a polarization beam splitting dielectric film, arranged in a 45-line configuration, and configured to transmit P-polarized light and totally reflect S-polarization state light. The high-reflection surface totally reflects light of all wavelengths, and the reflected light is substantially unchanged in polarization state relative to the incident light. Figure 3 Figure 3 The optical thin-film bandpass filter array 306 in the embodiments of the present application corresponds to the cemented optical surfaces S303-S305 and the high-reflection surface S306 of the first polarization beam splitter 304. Figure 3 Figure 3

[0079]

[0080] ​​​​​In the embodiment of the present application, the light signal of any polarization containing multiple light channels of λ1 to λ4 is collimated by the collimating lens 302 and is incident on the polarization conversion unit 303. The polarization conversion unit 303 decomposes the incident light signal into two parallel sub-beams having the same P-polarization state and being spatially separated. The two P-polarized sub-beams pass through the anti-reflection surface S307 of the first polarization beam splitter 304, are totally reflected on the high-reflection surface S301, and are deflected in the transmission direction. The two P-polarized sub-beams pass through the polarization splitting surfaces S302, S303, S304, and S305 of the first polarization beam splitter 304 in sequence without any obstruction, are reflected by the high-reflection surface S306, and are finally transmitted through the anti-reflection surface S311 of the first polarization beam splitter 304. The two P-polarized sub-beams transmitted through the anti-reflection surface S311 of the first polarization beam splitter 304 pass through the non-reciprocal polarization rotator 305 in the forward direction without any change in the polarization state, and are symmetrically incident on the physical center of the unit filter 306-4 in the optical thin-film bandpass filter array 306. The unit filter 306-4 transmits the light wave signal in the λ4 channel and reflects the light wave signal outside the λ4 channel.

[0081] In the embodiment of the present application, the two light wave signals of the λ4 channel having a fixed positional relationship and transmitted through the unit filter 306-4 continue to be transmitted, are polarization combined by the polarization conversion unit 303, and form a collimated light beam. The collimated light beam is again condensed by the corresponding lens unit 310-4 of the condensing lens array, and finally the light wave signal of the λ4 channel is received by the detection unit 309-4 of the light-receiving detector array.

[0082] In the embodiment of the present application, the P-polarized light wave signal outside the λ4 channel and reflected by the unit filter 306-4 becomes S-polarized light after being reversed and passing through the non-reciprocal polarization rotator 305 again, and is then reflected by the high-reflection surface S306 of the first polarization beam splitter 304 and guided to the polarization splitting surface S305 of the first polarization beam splitter 304. The S-polarized light wave signal outside the λ4 channel and reflected by the polarization splitting surface S305 is again deflected in the transmission direction and is directed to the quarter-wave plate 307 and the plane mirror 308. The plane mirror 308 reflects the light wave signal, and the light wave signal is converted into P-polarized light after passing through the quarter-wave plate 307 again. The P-polarized light wave signal outside the λ4 channel passes through the anti-reflection surface S312, the polarization splitting surface S305, and the anti-reflection surface S310 of the first polarization beam splitter 304 and the non-reciprocal polarization rotator 305 in sequence without any obstruction. The P-polarized light wave signal outside the λ4 channel passes through the non-reciprocal polarization rotator 305 in the forward direction without any change in the polarization state, and is symmetrically incident on the physical center of the unit filter 306-3 in the optical thin-film bandpass filter array. The unit filter 306-3 transmits the light wave signal in the λ3 channel and reflects the light wave signal outside the λ3 channel.

[0083] In the embodiment of the present application, the two light wave signals of the λ3 channel with fixed positional relationship transmitted from the unit filter 306-3 continue to transmit, are polarized and combined by the polarization conversion unit 303 to form a collimated light beam. The collimated light beam is converged by the corresponding lens unit 310-3 of the converging lens array, and finally the light wave signals of the λ3 channel are received by the detection unit 309-3 of the light receiving detector array.

[0084] In the embodiment of the present application, the light wave signals of the λ3 and λ4 channels reflected from the unit filter 306-3 pass through the non-orthogonal polarization rotator again in reverse, become S-polarized light, and then are incident to the polarization splitting surface S305 of the first polarization beam splitter 304 again. The light path of the light wave signals is reflected and transmitted according to the above rules, and the light wave signals pass through the non-orthogonal polarization rotator 305, the first polarization beam splitter 304, the quarter wave plate 307, the plane mirror 308, the polarization conversion unit 303 and the plurality of unit filters 306 multiple times. The light wave signals of the λ2 and λ1 channels are finally received by the detection units 309-2 and 309-1 of the light receiving detector array respectively. The light wave signals of the channels other than the λ1 to λ4 channels are transmitted out through the antireflection surface S315 of the second polarization beam splitter.

[0085] It should be noted that in the light receiving device in the embodiment of the present application, the optical thin film band pass filter array 306 can also be arranged between the polarization conversion unit 303 and the converging lens array 310.

[0086] In some embodiments, the light collimating unit can further include at least two lasers and a collimating lens corresponding to each laser, wherein each laser corresponds to an incident wavelength. Each laser is configured to emit a light signal of the corresponding incident wavelength to the collimating lens, and each collimating lens is configured to perform light collimation processing on the light signal having the corresponding incident wavelength and send the light collimation processed light signal to the light processing unit.

[0087] As shown in Figure 4 , Figure 4 is a schematic structural diagram of a 4-way parallel optical transceiver provided by an embodiment of the present application, Figure 4 The optical transceiver can be an optical transmitter, and the 4-way parallel optical transmitter is composed of four functional modules. The first functional module is an optical transmitting module, including a laser array 401 and a collimating lens array 402. The second functional module is an optical combining functional unit, including a plane mirror 408 and an optical thin film band pass filter array 403. The third functional module is a polarization processing module, including a first polarization combiner 406, a non-orthogonal polarization rotator and a quarter wave plate (QWP) 407. The fourth functional module is a fiber coupling module, including a converging lens 409 and a coupling output fiber 410.

[0088] In some embodiments, the laser array 401 is a multi-channel array composed of multiple laser chips of different wavelengths, for example, the laser array 401 includes lasers 401-1 to 401-4, and the output light signal polarization of the lasers is parallel to the side-by-side plane of the laser chip array (P-polarization). The optical thin-film bandpass filter array 403 (corresponding to Figure 4 units 403-1 to 403-4) has different filter bands (corresponding to Figure 4 with central wavelengths λ1 to λ4, respectively), and the passband wavelength of each unit filter corresponds to the wavelength of the corresponding channel laser, respectively. The unit filter transmits the wavelength in the corresponding optical channel and reflects the wavelength outside the channel. The optical thin-film bandpass filter array 403 can be directly composed of conventional DWDM filters on the market. The collimating lens array has one-to-one correspondence between each lens unit and the laser array.

[0089] In the embodiments of the present application, the first polarization beam combiner 406 includes multiple polarization beam splitting cemented optical surfaces (corresponding to Figure 4 S402 to S404), two mutually parallel high-reflection surfaces (corresponding to Figure 4 S401 and S405), and multiple anti-reflection optical surfaces (corresponding to Figure 4 S406 to S411). The cemented optical surfaces are parallel to each other and perpendicular to the high-reflection surfaces S401 and S405 in the principal section of the light rays. The cemented optical surfaces are coated with a polarization beam splitting dielectric film, configured at 45°, and configured to transmit P-polarized light and totally reflect S-polarized light. The high-reflection surfaces totally reflect light of all wavelengths, and the reflected light has substantially unchanged polarization state relative to the incident light.

[0090] In the embodiments of the present application, the main function of the non-reciprocal polarization rotator is to use the Faraday optical rotation effect of magneto-optical material to keep the polarization direction of linearly polarized light passing in the forward direction (from the laser array 401) unchanged, and convert the linearly polarized light passing in the reverse direction into linearly polarized light with orthogonal polarization state. In the optical transmitter provided in the embodiments of the present application, the non-reciprocal polarization rotator also functions as an optical isolator.

[0091] In the embodiment of the present application, the non-orthogonal polarization rotator is composed of a Faraday rotator and a half-wave plate. The Faraday rotator 404 can rotate the linear polarization direction clockwise (in the direction opposite to the light signal emission direction of the laser array 401) by 45°, and the half-wave plate 405 has an optical axis direction that forms an angle of 67.5° with the polarization direction (P polarization) of the light signal emitted by the laser array 401; or the Faraday rotator 404 can rotate the linear polarization direction counterclockwise (in the direction opposite to the light signal emission direction of the laser array 401) by 45°, and the half-wave plate 405 has an optical axis direction that forms an angle of 22.5° with the polarization direction (P polarization) of the light signal emitted by the laser array 401; or the half-wave plate 404 has an optical axis direction that forms an angle of 67.5° with the polarization direction (P polarization) of the light signal emitted by the laser array 401, and the Faraday rotator 405 can rotate the linear polarization direction counterclockwise (in the direction opposite to the light signal emission direction of the laser array 401) by 45°; or the half-wave plate 404 has an optical axis direction that forms an angle of 22.5° with the polarization direction (P polarization) of the light signal emitted by the laser array 401, and the Faraday rotator 405 can rotate the linear polarization direction clockwise by 45°.

[0092] In the embodiment of the present application, the plane mirror 408 has a single polarization high reflection film coated on the high reflection surface, and reflects all wavelengths of light, and the polarization state of the reflected light is basically unchanged relative to the incident light.

[0093] In the embodiment of the present application, the quarter-wave plate (QWP) 407 has an optical axis that forms an angle of 45° with the polarization direction of the light signal emitted by the laser array 401, and is arranged between the first polarization beam combiner 406 and the plane mirror 408.

[0094] In the embodiment of the present application, the light signal λ1 is emitted from the laser 401-1 and collimated by the collimating lens unit 402-1. The light signal λ1 has a wavelength that is just within the transmission band of the unit filter 403-1, and is not hindered to directly transmit through the unit filter 403-1, and the polarization state remains unchanged as P polarization. The light wave signal in the λ1 channel continues to transmit, and the reflected light path is deflected on the high reflection surface S405 of the first polarization beam combiner 406. The reflected light is not hindered to sequentially pass through the polarization splitting surfaces S404, S403 and S402 of the first polarization beam combiner 406, and the reflected light path is deflected on the high reflection surface S401 of the first polarization beam combiner 406. Finally, the reflected light passes through the converging lens 409 and is coupled into the coupling output optical fiber 410.

[0095] In the embodiment of the present application, the light signal λ2 is emitted from the light emitting unit 401-2 and collimated by the collimating lens unit 402-2. The light signal λ2 is in the transmission band of the spectrum of the unit filter 403-2 and directly transmits through the unit filter 403-2 without obstruction, passes through the non-reciprocal polarization rotator in the forward direction, and the polarization state remains unchanged as P polarization. The P-polarized light signal λ2 continues to propagate and directly passes through the polarization splitting surface S404 of the first polarization beam combiner 406 and is emitted from the antireflection surface S411 to the quarter-wave plate 407 and the plane mirror 408. The plane mirror 408 reflects the light signal λ2, which is converted into S-polarized light after passing through the quarter-wave plate 407 again. The S-polarized light signal λ2 enters the first polarization beam combiner 406 again from the antireflection surface S411, is reflected on the polarization splitting surface S404 of the first polarization beam combiner 406, and the optical path is deflected. The projection point positions of the light signal λ2 and the light signal λ1 on the polarization splitting surface S404 of the first polarization beam combiner 406 are substantially coincident. After deflection, the S-polarized light signal λ2 propagates forward along the propagation direction of the light signal λ1, is reflected again on the polarization splitting surface S403 of the first polarization beam combiner 406, is deflected, is emitted from the antireflection surface S407 of the first polarization beam combiner 406, passes through the non-reciprocal polarization rotator in the reverse direction, and the polarization state is converted from S polarization to P polarization. The light signal λ2 is in the reflection band of the spectrum of the unit filter 403-3 and is reflected by the unit filter 403-3. The P-polarized light signal λ2 passes through the non-reciprocal polarization rotator in the forward direction, and the polarization state remains unchanged as P polarization. The P-polarized light signal λ2 continues to propagate, directly passes through the polarization splitting surface S403 of the first polarization beam combiner 406, and is emitted from the antireflection surface S410 to the quarter-wave plate 407 and the plane mirror 408. The plane mirror 408 reflects the light signal λ2, which is converted into S-polarized light after passing through the quarter-wave plate 407 again. The S-polarized light signal λ2 enters the first polarization beam combiner 406 again from the antireflection surface S410, is reflected on the polarization splitting surface S403 of the first polarization beam combiner 406, and the optical path is deflected. The projection point positions of the light signal λ1 and the light signal λ2 on the polarization splitting surface S403 of the first polarization beam combiner 406 are substantially coincident. After deflection, the S-polarized light signal λ2 continues to propagate forward along the propagation direction of the light signal λ1, is reflected again on the polarization splitting surface S402 of the first polarization beam combiner 406, is deflected, is emitted from the antireflection surface S406 of the first polarization beam combiner 406, passes through the non-reciprocal polarization rotator in the reverse direction, and the polarization state is converted from S polarization to P polarization. The light signal λ2 is in the reflection band of the spectrum of the unit filter 403-4 and is reflected by the unit filter 403-4. The P-polarized light signal λ2 passes through the non-reciprocal polarization rotator in the forward direction, and the polarization state remains unchanged as P polarization.The P-polarized light signal λ2 continues to propagate, directly passes through the polarization splitting surface S402 of the first polarization beam combiner 406, and is emitted from the antireflection surface S409 to the quarter-wave plate 407 and the plane mirror 408. The plane mirror 408 reflects the light signal λ2, which is converted into S-polarized light after passing through the quarter-wave plate 407 again. The S-polarized light signal λ2 enters the first polarization beam combiner 406 again from the antireflection surface S409, is reflected twice by the polarization splitting surface S402 and the high-reflection surface S401 of the first polarization beam combiner 406, and is finally emitted from the antireflection surface S409 of the first polarization beam combiner 406, thereby completing the beam combination with the light signal λ1. The combined light signal is coupled into the coupling-out optical fiber 410 through the converging lens 409.

[0096] In the embodiment of the present application, the implementation of the beam combination process of the light wave signals λ3 and λ4 through the back-and-forth reflection propagation is similar to that of the light wave signal λ2, which will not be described herein again. It should be noted that the unit filter 403-1 is not necessary. The purpose of adding the unit filter 403-1 in the embodiment of the present application is to further reduce the influence of the echo light signals of other wavelengths in the optical path on the wavelength stability of the light-emitting unit 401-1.

[0097] The optical processing unit with the dense wavelength division multiplexing optical thin-film bandpass filter is used to filter the light signal in the embodiment of the present application, so that the optical transceiver device optical path provided by the embodiment of the present application is compact, and the miniaturization packaging problem of the dense wavelength division multiplexing optical transmission device is solved.

[0098] The above merely describes the embodiments of the present application, but does not serve to limit the protection scope of the present application. Any modification, equivalent replacement, and improvement made within the spirit and scope of the present application shall fall within the protection scope of the present application.

[0099] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures, or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that the size of the serial number of the above processes in various embodiments of the present application does not mean the execution order, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The serial number of the above embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments.

[0100] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element. In the several embodiments provided in the present document, it is to be understood that the disclosed devices and methods can be carried out by other ways of practicing that are either explicitly indicated, related to such implied, specific no matter how many substitutions, permuta tions, additions or modifications can be made thereto without departing from the scope and spirit of the disclosure. The embodiments described above are only illustrative, for example, the division of units is only a logical function division, and in actual implementation, other division manners can be used, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0101] The above description is merely illustrative of the application, and the scope of the application is not limited thereto. Any skilled in the art can easily make changes or replacements within the scope of the present application, and all changes and replacements should be covered within the scope of the present application. Therefore, the scope of the present application should be subject to the scope of protection of the claims.

Claims

1. An optical transceiver device, comprising: The optical transceiver device comprises: an optical collimation unit, configured to receive an optical signal, perform optical collimation processing on the optical signal, and send the optical collimation-processed optical signal to an optical processing unit; the optical processing unit is connected with the optical collimation unit, and comprises at least a thin-film band-pass filter, a polarization processing unit, a quarter-wave plate, and a plane mirror, the thin-film band-pass filter is an optical thin-film band-pass filter for dense wavelength division multiplexing, and the polarization processing unit comprises at least a polarization conversion unit, a first polarization beam splitter, and a non-reciprocal polarization rotator; the optical processing unit is configured to perform filtering processing on the optical collimation-processed optical signal through the thin-film band-pass filter to obtain a filtered signal; an optical receiving unit connected with the optical processing unit, configured to receive the filtered signal and convert the filtered signal into an electrical signal; wherein the polarization conversion unit is configured to receive the optical collimation-processed optical signal and decompose the optical collimation-processed optical signal into two parallel sub-beams with the same polarization state; the first polarization beam splitter is configured to deflect the propagation direction of the two sub-beams and make the deflected two sub-beams enter the non-reciprocal polarization rotator in a forward direction to obtain two symmetrical sub-beams; the thin-film band-pass filter is configured to perform filtering processing on the two symmetrical sub-beams to obtain two first filtered signals with a first preset wavelength and a mixed filtered signal with a different wavelength from the first filtered signal; wherein the first filtered signal constitutes the filtered signal; the thin-film band-pass filter is further configured to reflect the mixed filtered signal so that the mixed filtered signal passes through the non-reciprocal polarization rotator in a reverse direction, and the non-reciprocal polarization rotator is configured to change the polarization direction of the mixed filtered signal to form a first polarization filtered signal; the first polarization beam splitter is configured to make the first polarization filtered signal enter the quarter-wave plate and the plane mirror; the plane mirror is configured to reflect the first polarization filtered signal so that the reflected first polarization filtered signal is directed to the quarter-wave plate, and the quarter-wave plate is configured to change the polarization direction of the reflected first polarization filtered signal to form a second polarization filtered signal; the first polarization beam splitter is further configured to deflect the propagation direction of the second polarization filtered signal so that the deflected second polarization filtered signal enters the non-reciprocal polarization rotator in a forward direction and enters the thin-film band-pass filter; the thin-film band-pass filter is further configured to perform filtering processing on the second polarization filtered signal to obtain two second filtered signals with a second preset wavelength and a residual filtered signal; wherein the first filtered signal and the second filtered signal constitute the filtered signal.

2. The optical transceiver device of claim 1, wherein, The optical collimation unit comprises an incident optical fiber and a collimation lens corresponding to the incident optical fiber; the incident optical fiber is configured to emit the optical signal to the collimation lens; the collimation lens is configured to perform the optical collimation processing on the optical signal and send the optical collimation-processed optical signal to the optical processing unit.

3. The optical transceiver device of claim 1, wherein, The light collimation unit comprises at least two lasers and one collimation lens corresponding to each laser; each laser corresponds to an incident wavelength; Each laser is configured to emit a light signal of the corresponding incident wavelength to the collimation lens; Each collimation lens is configured to perform the light collimation processing on the light signal having the corresponding incident wavelength and send the light collimated signal to the light processing unit.

4. The optical transceiver device of claim 1, wherein, The polarization conversion unit comprises a second polarization beam splitter and a half-wave plate; The second polarization beam splitter is configured to receive the light collimated signal, decompose the light collimated signal into orthogonally polarized ordinary light and extraordinary light; The half-wave plate is configured to perform polarization conversion processing on the extraordinary light to obtain polarized converted ordinary light; wherein the ordinary light and the polarized converted ordinary light constitute the two sub-beams having the same polarization state and being parallel.

5. The optical transceiver device of claim 1, wherein, The polarization conversion unit comprises a second polarization beam splitter and a half-wave plate; The second polarization beam splitter is configured to receive the light collimated signal, decompose the light collimated signal into orthogonally polarized ordinary light and extraordinary light; The half-wave plate is further configured to perform polarization conversion processing on the ordinary light to obtain polarized converted extraordinary light; wherein the extraordinary light and the polarized converted extraordinary light constitute the two sub-beams having the same polarization state and being parallel.

6. The optical transceiver device of claim 1, wherein, The polarization conversion unit is further configured to perform polarization beam combining on the two beams of first filtered signals and the two beams of second filtered signals respectively, to form a first collimated light beam having the first preset wavelength and a second collimated light beam having the second preset wavelength.

7. The optical transceiver device of claim 6, wherein, The light receiving unit comprises at least one light receiving detector and a converging lens corresponding to each light receiving detector, each light receiving detector corresponding to a receiving wavelength; The converging lens is configured to converge the first collimated light beam and the second collimated light beam respectively, to obtain a converged first collimated light beam and a converged second collimated light beam; The light receiving detector corresponding to the first preset wavelength is configured to receive the converged first collimated light beam; The light receiving detector corresponding to the second preset wavelength is configured to receive the converged second collimated light beam.

8. The optical transceiver device of claim 1, wherein, The first polarization beam splitter is further configured to output the remaining filtered signals.

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