Dual port optical transmit-receive assembly

Abstract

The application provides a double-port optical transmitting and receiving assembly, which comprises an optical transmitting group, an optical circulator, an optical turning element, a first input / output end, a second input / output end and an optical receiving group. The first input / output end and the second input / output end are arranged in a spaced manner. First signal light emitted by the optical transmitting group enters the first input / output end after passing through the optical circulator, and second signal light emitted by the optical transmitting group enters the second input / output end after passing through the optical circulator and being reflected by the optical turning element. Third signal light emitted from the first input / output end enters the optical receiving group after passing through the optical circulator, and fourth signal light emitted from the second input / output end enters the optical receiving group after being reflected by the optical turning element and passing through the optical circulator. The double-port optical transmitting and receiving assembly has a small size and a high channel utilization rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber communication technology, and particularly relates to a dual-port optical transmitting and receiving assembly. BACKGROUND

[0002] At present, according to different use purposes, a dual-port optical transmitting and receiving assembly can correspond to structural devices of different structural layouts. For example, the dual-input and output ports can receive signals of different wavelengths, or can transmit signals of two different wavelengths. Therefore, for different use modes, the dual-port optical transmitting and receiving assembly usually needs to be correspondingly designed with appropriate structural components to achieve the corresponding use requirements. In addition, the usual dual-port optical transmitting and receiving assembly usually adopts a discrete optical splitting core assembly, an optical transmitting group and a receiving group, which occupies a large module space, resulting in that the size cannot be compatible with the small form factor pluggable dual density (SFP-DD) multi-source agreement (MSA) standard (the distance between two ports is 6.25 mm, IEC61754-20), and the cost is high, which is not conducive to the integration of the dual-port optical transmitting and receiving assembly. SUMMARY

[0003] An object of the present application is to solve the problems existing in the prior art and provide a dual-port optical transmitting and receiving assembly with smaller volume and higher channel utilization.

[0004] To solve the above technical problems, the present application adopts the following technical solutions:

[0005] A dual-port optical transmitting and receiving assembly comprises:

[0006] an optical transmitting group, an optical circulator, an optical turning element, a first input and output port and a second input and output port, and an optical receiving group, wherein the first input and output port and the second input and output port are arranged in a spaced manner.

[0007] The first signal light emitted by the optical transmitting group enters the first input and output port after passing through the optical circulator, and the second signal light emitted by the optical transmitting group enters the second input and output port after passing through the optical circulator and being reflected by the optical turning element.

[0008] The third signal light emitted from the first input and output port enters the optical receiving group after passing through the optical circulator, and the fourth signal light emitted from the second input and output port enters the optical receiving group after being reflected by the optical turning element and passing through the optical circulator.

[0009] Further, the optical transmitting group is a tunable wavelength optical transmitting group, and the wavelength of the first signal light is different from the wavelength of the second signal light.

[0010] Further, a filter is arranged between the first input / output end and the light turning element, the first signal light passing through the light turning element passes through the filter and enters the first input / output end, and the second signal light is reflected by the filter and re-enters the light turning element, and then passes through the light turning element and enters the second input / output end.

[0011] Further, the light turning element has an asymmetric trapezoidal shape, and the two angles of the base of the trapezoid are not equal.

[0012] Further, a filter assembly is arranged between the optical circulator and the light turning element, the filter assembly comprising a light deviation element close to the optical circulator and a filter opposite to the optical circulator.

[0013] Further, one of the first signal light and the second signal light passing through the light deviation element can pass through the filter, and the other signal light is reflected by the filter and re-enters the light deviation element, and then is reflected and deviated by a distance by the light deviation element and exits the light deviation element.

[0014] Further, the light turning element has a parallelogram shape, the light deviation element is provided with an anti-reflection film on a local area on the side facing the optical circulator, and is provided with a high-reflection film on another local area.

[0015] Further, the light emission group is a double-path light emission group, and the first signal light and the second signal light have the same wavelength.

[0016] Further, the first signal light and the second signal light are parallel and have a spacing distance.

[0017] Further, the light turning element has a parallelogram shape.

[0018] Further, an optical absorption sheet is arranged on the side of the optical circulator away from the light receiving group, and the optical absorption sheet is used to absorb stray light and reduce the stray light entering the light receiving group.

[0019] Further, a light stop is arranged between the optical circulator and the light receiving group, and the light stop is provided with an opening to allow the third signal light and the fourth signal light to pass through.

[0020] From the above technical solution, the present application has at least the following advantages and positive effects:

[0021] In the present application, the above-mentioned dual-port optical transmitting and receiving assembly can realize that two-way signal light enters the first input / output end and the second input / output end from the optical transmitting group respectively through the optical transmitting group, the circulator assembly and the optical turning element, and also can realize that the other two-way signal light is transmitted from the first input / output end and the second input / output end to the optical receiving group respectively. Therefore, the dual-port optical transmitting and receiving assembly of the present application includes four optical paths, all of which use the same set of optical splitting core components (optical circulator, optical turning element), optical transmitting group and optical receiving group, realizes extremely high integration, improves space utilization so as to make it compatible in size with the small form factor pluggable dual density (SFP-DD) multi-source agreement (MSA) standard, and reduces the cost. At the same time, since the optical circulator is used to realize the transmission and reception of the optical path, the dual-port optical transmitting and receiving assembly has the characteristics of small loss and insensitivity to polarization. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the dual-port optical transmitting and receiving assembly of the present application using a two-way optical transmitting group with the same wavelength.

[0023] Figure 2 is a structural schematic diagram of another embodiment of the dual-port optical transmitting and receiving assembly using a two-way optical transmitting group with the same wavelength.

[0024] Figure 3 is a structural schematic diagram of the optical circulator shown in Figure 1

[0025] Figure 4 is an optical path diagram of the optical circulator shown in Figure 3

[0026] Figure 5 is an optical path diagram of two-way signal light from the dual-port optical transmitting and receiving assembly using a two-way optical transmitting group with the same wavelength to two input / output ends.

[0027] Figure 6 is an optical path diagram of the first signal light shown in Figure 5

[0028] Figure 7 is an optical path diagram of the second signal light shown in Figure 5

[0029] Figure 8 is another optical path diagram of the optical circulator shown in Figure 1

[0030] Figure 9 is an optical path diagram of two-way signal light from the dual-port optical transmitting and receiving assembly to the optical receiving group from two input / output ends.

[0031] Figure 10 is an optical path diagram of the optical circulator shown in Figure 9 ​​​​​A light path diagram of the third signal light.

[0032] Figure 11 A light path diagram of the fourth signal light. Figure 9 A light path diagram of the third signal light.

[0033] Figure 12 A structure diagram of a two-port optical transmitting / receiving assembly employing a tunable wavelength optical transmitting group.

[0034] Figure 13 A light path diagram of the fourth signal light. Figure 12 A light path diagram of the two signal lights of the two-port optical transmitting / receiving assembly from the optical transmitting group to the two input / output terminals.

[0035] Figure 14 A light path diagram of the third signal light. Figure 13 A light path diagram of the third signal light.

[0036] Figure 15 A light path diagram of the fourth signal light. Figure 13 A light path diagram of the fourth signal light.

[0037] Figure 16 A structure diagram of an optical turning element. Figure 13

[0038] A light path diagram of the optical turning element. Figure 17 Figure 16 A structure diagram of a second embodiment of a two-port optical transmitting / receiving assembly employing a tunable wavelength optical transmitting group.

[0039] Figure 18 A light path diagram of the two signal lights of the two-port optical transmitting / receiving assembly from the optical transmitting group to the two input / output terminals.

[0040] Figure 19 Figure 18 A light path diagram of the two signal lights of the two-port optical transmitting / receiving assembly from the optical transmitting group to the two input / output terminals.

[0041] Figure 20 A structure diagram of a third embodiment of a two-port optical transmitting / receiving assembly employing a tunable wavelength optical transmitting group.

[0042] Figure 21 A light path diagram of the two signal lights of the two-port optical transmitting / receiving assembly from the optical transmitting group to the two input / output terminals. Figure 20

[0043] A light path diagram of the two signal lights of the two-port optical transmitting / receiving assembly from the two input / output terminals to the optical receiving group. Figure 22 Figure 12 A light path diagram of the third signal light.

[0044] Figure 23 Figure 22 A light path diagram of the third signal light. ​​​​

[0045] Figure 24 is Figure 22 the light path diagram of the fourth signal light shown in FIG. 4.

[0046] Figure 25 is Figure 18 the light path diagram of the signal light transmitted from the two input / output ends to the light receiving group of the dual-port light transmitting / receiving assembly shown in FIG. 5.

[0047] Figure 26 is Figure 20 the light path diagram of the signal light transmitted from the two input / output ends to the light receiving group of the dual-port light transmitting / receiving assembly shown in FIG. 5.

[0048] The reference signs are explained as follows: 1, light transmitting group; 11, first lens; 2, optical circulator; 21, first polarization splitting element; 211, total reflection surface; 22, second polarization splitting element; 23, wave plate; 24, Faraday rotator assembly; 3, light turning element; 4, first input / output end; 5, second input / output end; 6, light receiving group; 61, second lens; 7, filter; 71, light shifting element; 8, light absorbing sheet; 9, light barrier; 91, aperture; 10, housing. DETAILED DESCRIPTION

[0049] The typical embodiments embodying the features and advantages of the present application will now be described in detail. It should be appreciated that the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0050] In the description of the present application, it should be understood that the indication of direction or positional relationship (such as up, down, left, right, front and back, etc.) in the embodiments shown in the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation. When the positions of these elements are changed, the indication of direction is also changed accordingly.

[0051] In addition, the terms "first", "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0052] The present application provides a dual-port light transmitting / receiving assembly. Please refer to Figure 1The dual-port optical transmitting-receiving assembly comprises an optical transmitting group 1, an optical circulator 2, an optical turning element 3, a first input-output end 4, a second input-output end 5, and an optical receiving group 6.

[0053] Specifically, the dual-port optical transmitting-receiving assembly is externally provided with a shell 10. The optical transmitting group 1 is arranged at one end of the shell 10, and the first input-output end 4 and the second input-output end 5 are arranged at the other end of the shell 10. The optical circulator 2 and the optical turning element 3 are accommodated in the shell 10. The optical receiving group 6 is arranged at the lower side of the shell 10. The optical receiving group 6 is distributed perpendicularly to the optical transmitting group 1.

[0054] The optical transmitting group 1 is used for transmitting laser signal light. Figure 1 In the embodiment shown, the optical transmitting group 1 is a dual-channel optical transmitting group with the same wavelength. Specifically, the dual-channel optical transmitting group can emit first signal light and second signal light with the same wavelength. The dual-channel optical transmitting group can realize optical separation of two channels by using two built-in lenses with a spacing of 750 microns in the laser.

[0055] In addition, one or two first lenses 11 can be arranged in front of the dual-channel optical transmitting group. The first lens 11 is used for collimating the first signal light and the second signal light. Please refer to Figure 2 When the first lens 11 is two, the two first lenses 11 can be used for collimating the first signal light and the second signal light, respectively. The signal light beam output by the optical transmitting group 1 adopts collimated light rather than conventional convergent light, which can increase the coupling efficiency and reduce stray light caused by coupling mismatch.

[0056] Please refer to Figure 3 The optical circulator 2 is a multi-port optical device with non-reciprocal characteristics. The optical circulator 2 comprises two deflection light splitting elements 21 and 22, a wave plate 23, and a Faraday rotator assembly 24. The two deflection light splitting elements are a first polarization light splitting element 21 and a second polarization light splitting element 22. A partial region of the first polarization light splitting element 21 is provided with a total reflection surface 211, on which the signal light can be totally reflected. The total reflection surface 211 can be provided with a high-reflection film or no film. The wave plate 23 can be a half-wave plate. The Faraday rotator assembly 24 can rotate the polarization state of light by using the Faraday effect.

[0057] Please refer to Figure 1 Specifically, in the embodiment, the dual-port optical transmitting-receiving assembly further comprises an optical absorption sheet 8. The optical absorption sheet 8 is arranged on the side (or upper side) of the optical circulator 2 away from the optical receiving group 6, and is used for absorbing stray light and reducing the entry of stray light into the optical receiving group 6. The optical absorption sheet is made of an optical absorption material.

[0058] The optical circulator 2 is arranged in front of the optical transmitting group 1. The first signal light and the second signal light emitted by the optical transmitting group 1 enter the optical circulator 2. Please refer to Figure 4 , Figure 4 The optical path diagram of the signal light emitted by the optical transmitting group 1 passing through the optical circulator 2 is shown in the figure. The first signal light or the second signal light is output from the optical transmitting group 1, collimated by the first lens 11, enters the optical circulator 2 respectively, is divided into two polarized lights by the first polarization beam splitter 21, passes through the Faraday rotator assembly 24 and the wave plate 23, and is combined by the second polarization beam splitter 22 and then emitted forward.

[0059] Further, please refer to Figure 5 , Figure 5 The optical path structure diagram of the first signal light and the second signal light transmitted by the double-path optical transmitting group 1 to the first input / output end 4 and the second input / output end 5 is shown in the figure. There is a certain interval between the first signal light and the second signal light. Moreover, the first signal light and the second signal light are emitted in parallel with each other. After collimation by the first lens 11, the first signal light and the second signal light enter the optical circulator 2 and are emitted with a certain interval on the upper and lower sides of the optical circulator 2 close to the first input / output end 4.

[0060] Please refer to Figure 6 , Figure 6 The optical path diagram of the first signal light is shown in the figure. After passing through the optical circulator 2, the first signal light can directly enter the first input / output end 4.

[0061] Please refer to Figure 7 , Figure 7 The optical path diagram of the second signal light is shown in the figure. After passing through the optical circulator 2, the second signal light enters the optical turning element 3. The second signal light is reflected twice inside the optical turning element 3 and is emitted from the side of the optical turning element 3 close to the second input / output end 5 to enter the second input / output end 5.

[0062] Specifically, the shape of the optical turning element 3 can be a parallelogram structure. Two short oblique sides of the parallelogram can be reflective surfaces, so that the second signal light can be reflected twice by the optical turning element 3 and reach the second input / output end 5.

[0063] The first input / output end 4 and the second input / output end 5 can be used for emitting and receiving signal light. In order to facilitate the description, the first input / output end 4 emits the third signal light and the second input / output end 5 emits the fourth signal light are taken as examples for description.

[0064] Please refer to Figure 8 , Figure 8This is an optical path diagram showing the propagation of the third or fourth signal light of the dual-port optical transmitter and receiver assembly within the optical circulator 2. When the third or fourth signal light enters the optical circulator 2, it is first split into two polarized beams by the second polarization beam splitter 22, then passes through the waveplate 23 and the Faraday rotator assembly 24, and finally passes through the first polarization beam splitter 21 to combine the beams before being emitted downwards and entering the optical receiver group 6.

[0065] Please see Figure 9 , Figure 9 The diagram shows the optical path of the third and fourth signal lights transmitted from the two input / output terminals to the optical receiving group. Lenses (not shown) are provided on the light-transmitting surfaces of the first input / output terminal 4 and the second input / output terminal 5. The lenses have a large bevel angle. Due to the increased bevel angle, the misalignment between the reflected stray light and the signal light is increased, reducing the proportion of energy of the reflected stray light entering the optical receiving group 6, thereby improving the signal-to-noise ratio.

[0066] Please refer to the details. Figure 10 , Figure 10 This is the optical path diagram of the third signal light. The third signal light is emitted from the first input / output terminal 4 and directly enters the optical circulator 2. After passing through the optical circulator 2, the third signal light is emitted from the side of the optical circulator 2 closest to the optical receiving group 6, converged by the second lens 61, and received by the optical receiving group 6.

[0067] Please see Figure 11 , Figure 11 This is the optical path diagram of the fourth signal light. The fourth signal light is emitted from the second input / output terminal 5, and after being reflected twice by the optical deflection element 3, it enters the optical circulator 2. The fourth signal light passes through the optical circulator 2 and is emitted from the side of the optical circulator toward the optical receiving group 6. It is then converged by the second lens 61 and received by the optical receiving group 6.

[0068] The optical receiver group 6 is used to receive signal light. A second lens 61 may also be provided in front of the optical receiver group 6. The second lens 61 is used to converge the third and fourth signal lights emitted from the first input / output terminal 4 and the second input / output terminal 5. The third and fourth signal lights that pass through the optical circulator 2 enter the optical receiver group 6 after being converged by the second lens 61.

[0069] Specifically, in this embodiment, the dual-port optical transmitter and receiver assembly may further include, for example: Figure 1 The aperture 9 is shown. Aperture 9 is placed on top of the optical receiving group 6. The opening 91 of aperture 9 allows the third and fourth signal lights to pass through, while the portion other than the opening 91 is used to block stray light returning from the fiber optic bevel and lens bevel. The surface of aperture 9 is preferably covered with a light-absorbing material to absorb stray light falling on aperture 9, preventing secondary reflections from entering the optical receiving group 6.

[0070] The first input / output terminal 4 can be used to transmit a third signal light and to receive a first signal light. The second input / output terminal 5 can be used to transmit a fourth signal light and to receive a second signal light. The first input / output terminal 4 and the second input / output terminal 5 are arranged side by side and spaced apart. Specifically, in this embodiment, the distance between the first input / output terminal 4 and the second input / output terminal 5 can be 6.25 mm, which meets the requirements of the international electrical standard IEC 61754-20.

[0071] like Figure 5 and Figure 9 As shown, the optical deflection element 3 is located on the light-emitting side of the optical circulator 2 and the light-input side of the second input / output terminal 5. This can be understood as the optical deflection element 3 being located between the optical circulator 2 and the second input / output terminal 5.

[0072] The optical deflector 3 can reflect the second signal light, allowing it to enter the second input / output terminal 5. Furthermore, the optical deflector 3 can also reflect the fourth signal light emitted from the second input / output terminal 5, allowing it to enter the optical circulator 2. Specifically, the optical deflector 3 can be a prism.

[0073] Specifically, in this embodiment, the light-transmitting surfaces of the optical circulator 2 and the optical deflection element 3 are preferably deflected at a certain angle relative to the optical path, forming a deflection angle between them. Due to the introduced deflection angle, the reflected stray light generated by the light-transmitting surfaces of the optical circulator 2 and the optical deflection element 3 is misaligned with the signal light, causing the reflected stray light to fall at the non-aperture position of the aperture 9, thus preventing it from entering the optical receiving group 6 through the aperture 91, which helps to reduce stray light entering the optical receiving group 6.

[0074] Furthermore, in this specific embodiment, at least one or more of the light emitting group 1, the light circulator 2, the light deflection element 3, the first input / output terminal 4, the second input / output terminal 5, and the light receiving group 6 are provided with anti-reflection films to reduce stray light reflected from the light-transmitting surface.

[0075] The structure of the dual-port optical transmitter and receiver assembly in the second embodiment is generally similar to that in the first embodiment. The identical parts will not be described again here. The main difference is that the optical transmitter group 1 in the second embodiment can be changed to a tunable wavelength optical transmitter group, and the wavelengths of the first signal light and the second signal light are different. Therefore, this dual-port optical transmitter and receiver assembly is a dual-port optical transmitter and receiver assembly with a tunable wavelength design.

[0076] Please see Figure 12 , Figure 12 This is a schematic diagram of the first embodiment of a two-port optical transmitter-receiver assembly employing a tunable wavelength optical transmitter group. The two-port optical transmitter-receiver assembly with variable wavelength design in this embodiment further includes a filter 7.

[0077] Filter 7 is positioned between the first input / output terminal 4 and the optical circulator 2. Since the wavelengths of the first signal light and the second signal light are different, filter 7 can be configured to transmit the first signal light and reflect the second signal light.

[0078] Please see Figure 13 , Figure 13 The diagram shows the optical path of the first and second signal lights emitted from the tunable wavelength light emitting group 1 and entering the first input / output terminal 4 and the second input / output terminal 5, respectively. The filter 7 transmits the first signal light and reflects the second signal light. The filter 7 can be positioned between the optical deflection element 3 and the first input / output terminal 4. The filter 7 is positioned opposite to the first input / output terminal 4.

[0079] Please see Figure 14 , Figure 14 This is a schematic diagram of the optical path of the first signal light from the optical emission group 1 to the first input / output terminal 4. That is, after the first signal light passes through the optical circulator 2, the first signal light passes through the optical deflection element 3 and enters the filter 7. Then, the first signal light passes through the filter 7 and directly enters the first input / output terminal 4.

[0080] Please see Figure 15 , Figure 15 This is a schematic diagram of the optical path of the second signal light from the optical emission group 1 to the second input / output terminal 5. After passing through the optical circulator 2, the second signal light is reflected by the filter 7 and then enters the optical deflection element 3 again. After two reflections by the optical deflection element 3, the second signal light is guided to the second input / output terminal 5.

[0081] Please see Figure 16 and Figure 17 Specifically, the optical deflector element 3 adopts an asymmetrical trapezoidal structure. The two acute angles at the base of the trapezoid, angle A and angle B, are unequal in size, thus achieving the effect of adjusting the optical path. For example... Figure 16 As shown. Specifically, the degree measure of angle A is less than the degree measure of angle B.

[0082] The optical path diagram of the signal light in the optical deflector element 3 and the filter 7 is as follows: Figure 17 As shown. After passing through the optical deflector 3 and filter 7, the two outgoing beams are parallel and the distance H is 6.25mm. Therefore, the distance between the first input / output terminal 4 and the second input / output terminal 5 can also be 6.25mm.

[0083] Please see Figure 18 and Figure 19 , Figure 18 This is a schematic diagram of the dual-port optical transmitter and receiver assembly of the tunable wavelength optical transmitter group in the second embodiment. Figure 19 for Figure 18The diagram shows the optical path of the two signal lights transmitted from the tunable wavelength optical transmitter group 1 to the first input / output terminal 4 and the second input / output terminal 5 in the dual-port optical transmitter / receiver assembly shown.

[0084] exist Figure 18 In this design, the filter 7 is disposed on the upper half of an optical deflection element 71, thus forming a filter assembly. The filter assembly includes an optical deflection element 71 near the optical circulator 2 and a filter 7 facing away from the optical circulator 2. The optical deflection element 71 is parallelogram-shaped, and its side, which is in contact with the filter 7, gradually slopes upwards towards the optical circulator 2. The filter assembly is disposed between the first input / output terminal 4 and the optical circulator 2. The filter 7 can be configured to transmit a first signal light and reflect a second signal light.

[0085] Please see Figure 19 After the first and second signal lights pass through the optical circulator 2, they pass through the optical deflection element 71 and enter the filter 7. The first signal light passes through the filter 7 and enters the first input / output terminal 4. The second signal light, after being reflected by the filter 7, re-enters the optical deflection element 71. After being reflected downwards by the optical deflection element 71, it enters the optical reversing element 3. Through the optical path reversing effect of the optical reversing element 3, the second signal light is guided to the second input / output terminal 5. Preferably, the optical deflection element 71 has an anti-reflection film in a local area facing the optical circulator 2 for the first and second signal lights to be incident, and a high-reflection film in another local area for reflecting the second signal light, thereby improving signal quality.

[0086] Please see Figure 20 and Figure 21 , Figure 20 This is a schematic diagram of the third embodiment of a dual-port optical transmitter and receiver assembly employing a tunable wavelength optical transmitter group. Figure 21 for Figure 20 The diagram shows the optical path of the dual-port optical transmitter and receiver assembly, in which the signal light is transmitted from the tunable wavelength optical transmitter group 1 to the first input / output terminal 4 and the second input / output terminal 5.

[0087] exist Figure 20 In this configuration, the filter 7 is disposed in the lower half of the optical deflection element 71, thus forming a filter assembly. The optical deflection element 71 is parallelogram-shaped, and its side, which is attached to the filter 7, gradually slopes downwards towards the optical circulator 2. The filter 7 is configured to reflect the first signal light and transmit the second signal light.

[0088] Please see Figure 21After the first and second signal lights pass through the optical circulator 2, they pass through the optical deflection element 71 and enter the filter 7. The first signal light, after being reflected by the filter 7, re-enters the optical deflection element 71 and exits towards the first input / output terminal 4. The second signal light passes through the filter 7 and enters the optical reversing element 3. The optical reversing element 3 guides the second signal light to the second input / output terminal 5. Preferably, the optical deflection element 71 has an anti-reflection coating in a localized area facing the optical circulator 2 for the first and second signal lights to be incident, and a high-reflection coating in another localized area for reflecting the first signal light, thereby improving signal quality.

[0089] Please see Figure 22 , Figure 22 for Figure 12 The diagram shows the optical path of the third and fourth signal lights in the dual-port optical transmitter and receiver assembly. The third and fourth signal lights are emitted from the first input / output terminal 4 and the second input / output terminal 5, respectively, and are ultimately received by the optical receiver group 6.

[0090] For details, please refer to Figure 23 , Figure 23 This is the optical path diagram of the third signal light. The third signal light is emitted from the first input / output terminal 4, passes through the filter 7 and the optical deflection element 3, and enters the optical circulator 2. After passing through the optical circulator 2, the third signal light is finally emitted from the side of the optical circulator 2 closest to the optical receiving group 6, and is converged by the second lens 61 and received by the optical receiving group 6.

[0091] Please see Figure 24 , Figure 24 This is the optical path diagram of the fourth signal light. The fourth signal light is emitted from the second input / output terminal 5, reflected twice by the optical deflection element 3, enters the filter 7, and is then reflected again by the filter 7 into the optical circulator 2. After being reflected by the optical circulator 2, the fourth signal light finally exits from the side of the optical circulator 2 closest to the optical receiving group 6, is converged by the second lens 61, and is received by the optical receiving group 6.

[0092] Figure 25 for Figure 18The diagram shows the optical paths of the third and fourth signal lights in the dual-port optical transmitter-receiver assembly. The third signal light is emitted from the first input / output terminal 4, passes through the filter 7 and the optical deflection element 3, and enters the optical circulator 2. The fourth signal light is emitted from the second input / output terminal 5, undergoes two reflections by the optical deflection element 3, enters the optical deflection element 71, is reflected by the optical deflection element 71, enters the filter 7, is reflected again by the filter 7, enters the optical deflection element 71, and then passes through the optical deflection element 71 into the optical circulator 2. After passing through the optical circulator 2, the third and fourth signal lights finally exit from the side of the optical circulator 2 closest to the optical receiver group 6, are converged by the second lens 61, and are received by the optical receiver group 6.

[0093] Figure 26 for Figure 20 The diagram shows the optical paths of the third and fourth signal lights in the dual-port optical transmitter-receiver assembly. The third signal light is emitted from the first input / output terminal 4, reflected by the optical deflector 71 to the filter 7, reflected again by the filter, and then enters the optical deflector 71 before passing through it and entering the optical circulator 2. The fourth signal light is emitted from the second input / output terminal 5, reflected twice by the optical deflector 3, enters the filter 7, and then passes through the filter 7 and the optical deflector 71 before entering the optical circulator 2. After passing through the optical circulator 2, the third and fourth signal lights finally exit from the side of the optical circulator 2 closest to the optical receiver group 6, are converged by the second lens 61, and are received by the optical receiver group 6.

[0094] Among them Figure 12 In the dual-port optical transmitter and receiver assembly shown, such as Figure 14 The first signal light transmitted from the light emitting group 1 to the first input / output terminal 4, as shown, is related to... Figure 23 The third signal light transmitted from the first input / output terminal 4 to the optical receiving group 6 is a group of signal lights with the same wavelength.

[0095] And such Figure 15 The second signal light transmitted from the light emission group 1 to the second input / output terminal 5, and as... Figure 24 The fourth signal light shown, transmitted from the second input / output terminal 5 to the optical receiving group 6, is another set of signal lights with the same wavelength.

[0096] However, the wavelengths of the third signal light emitted from the first input / output terminal 4 and the fourth signal light emitted from the second input / output terminal 5 can be different. For example, the wavelengths of both the first and third signal lights can be 1625 nm. The wavelengths of both the second and fourth signal lights can be 1627 nm.

[0097] The aforementioned dual-port optical transmitter-receiver assembly, through a dual-path optical transmitter group, an optical circulator 2, and an optical switching element 3, enables the transmission of the first and second signal lights from the optical transmitter group 1 to the first input / output terminal 4 and the second input / output terminal 5, respectively. It also enables the transmission of the third and fourth signal lights from the first input / output terminal 4 and the second input / output terminal 5 to the optical receiver group 6. Therefore, the dual-port optical transmitter-receiver assembly of this invention includes four optical paths, and both the input and output channels can use signal lights of different wavelengths, greatly improving channel utilization. Furthermore, the size of the aforementioned dual-port optical transmitter-receiver assembly is compatible with the Small Form Factor Pluggable Dual Density (SFP-DD) Multi-Source Protocol (MSA) standard, significantly reducing costs. Simultaneously, all four optical paths use the same set of beam splitting core components: the optical circulator 2 and the optical switching element 3, achieving extremely high integration, improving space utilization, and enabling size compatibility with the SFP hot-swappable module standard, while significantly reducing costs.

[0098] Furthermore, the dual-port optical transmitter and receiver assembly of this invention uses an optical circulator 2 to realize the transmission and reception of the optical path, and also features low loss and insensitivity to the polarization state of both the transmitted and received signal light. It can be applied to application scenarios with high requirements for channel utilization, space, cost, and loss, such as highly integrated optical time domain reflectometers (OTDRs).

[0099] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A dual-port optical transmitter and receiver assembly, characterized in that, include: An optical emitting group, an optical circulator, an optical deflector, a first input / output terminal and a second input / output terminal, and an optical receiving group, wherein the first input / output terminal and the second input / output terminal are arranged at intervals. The first signal light emitted by the optical emitting group passes through the optical circulator and enters the first input / output terminal. The second signal light emitted by the optical emitting group passes through the optical circulator and is reflected by the optical deflection element before entering the second input / output terminal. The third signal light emitted from the first input / output terminal passes through the optical circulator and enters the optical receiving group. The fourth signal light emitted from the second input / output terminal is reflected by the optical deflection element, passes through the optical circulator, and then enters the optical receiving group.

2. The dual-port optical transmitter and receiver assembly according to claim 1, characterized in that, The light emission group is a tunable wavelength light emission group, and the wavelength of the first signal light is different from the wavelength of the second signal light.

3. The dual-port optical transmitter and receiver assembly according to claim 2, characterized in that, It also includes a filter, which is disposed between the first input / output terminal and the optical deflection element. The first signal light passing through the optical deflection element passes through the filter and enters the first input / output terminal, while the second signal light is reflected by the filter and enters the optical deflection element again, and enters the second input / output terminal after being reflected by the optical deflection element.

4. The dual-port optical transmitter and receiver assembly according to claim 3, characterized in that, The optical deflection element has an asymmetrical trapezoidal shape, and the two included angles of the base of the trapezoid are not equal in size.

5. The dual-port optical transmitter and receiver assembly according to claim 2, characterized in that, It also includes a filter assembly disposed between the optical circulator and the optical deflection element, the filter assembly including an optical deflection element close to the optical circulator and a filter opposite to the optical circulator.

6. The dual-port optical transmitter and receiver assembly according to claim 5, characterized in that, One of the first signal light and the second signal light passing through the optical deflection element can pass through the filter; while the other signal light is reflected by the filter and re-enters the optical deflection element, is reflected by the optical deflection element and deflected a certain distance before leaving the optical deflection element.

7. The dual-port optical transmitter and receiver assembly according to claim 5, characterized in that, The shape of the light deflection element is a parallelogram; the light deflection element has an anti-reflection film in a local area facing the light circulator, and a high-reflection film in another local area.

8. The dual-port optical transmitter and receiver assembly according to claim 1, characterized in that, The light emission group is a dual-path light emission group, and the first signal light and the second signal light have the same wavelength.

9. The dual-port optical transmitter and receiver assembly according to claim 8, characterized in that, The first signal light and the second signal light are emitted in parallel and are spaced apart.

10. The dual-port optical transmitter and receiver assembly according to claim 8, characterized in that, The shape of the optical deflector element is a parallelogram.

11. The dual-port optical transmitter and receiver assembly according to claim 1, characterized in that, It also includes a light-absorbing sheet disposed on the side of the optical circulator opposite to the optical receiving group, the light-absorbing sheet being used to absorb stray light and reduce the stray light entering the optical receiving group.

12. The dual-port optical transmitter and receiver assembly according to claim 1, characterized in that, It also includes an aperture disposed between the optical circulator and the optical receiver group, the aperture having an opening to allow the third signal light and the fourth signal light to pass through it.

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