Dual-port light emitting and receiving assembly

Abstract

The invention provides a dual-port light emitting and receiving assembly. The dual-port light emitting and receiving assembly comprises a light emitting group, an optical circulator, a light turning element, a first input / output end, a second input / output end and a light receiving group, the first input and output ends and the second input and output ends are arranged at intervals. First signal light emitted by the light emitting group passes through the optical circulator and then enters the first input and output end, and second signal light emitted by the light emitting group passes through the optical circulator and then enters the second input and output end after being reflected by the light turning element. Third signal light emitted from the first input and output end passes through the optical circulator and then enters the light receiving group, and fourth signal light emitted from the second input and output end is reflected by the light turning element, passes through the optical circulator and then enters the light receiving group. The dual-port optical transmitting and receiving assembly is small in size and high in channel utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber communication, and in particular to a dual-port optical transmitting and receiving component. Background Art

[0002] At present, for dual-port optical transmitting and receiving components, different structural layouts can be formed according to different usage purposes. For example, the dual input and output ports can receive signals of different wavelengths, and can also transmit signals of two different wavelengths. Therefore, for different usage modes, the dual-port optical transmitting and receiving components usually need to design corresponding structural components to achieve the corresponding usage requirements. In addition, the conventional dual-port optical transmitting and receiving components mostly use discrete splitting core components, optical transmitting groups and receiving groups, which occupy a large module space, resulting in the size being incompatible with the small form factor pluggable double density (SFP-DD) multi-source agreement (MSA) standard (two-port spacing 6.25mm, IEC61754-20), and the high cost is not conducive to the integration of dual-port optical transmitting and receiving components. Summary of the invention

[0003] An object of the present invention is to solve the deficiencies in the prior art and to provide a dual-port optical transmitting and receiving component with a small volume and a high channel utilization rate.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A dual-port optical transmitting and receiving component, comprising:

[0006] An optical transmitting group, an optical circulator, an optical turning element, a first input-output end and a second input-output end, and an optical receiving group, wherein the first input-output end and the second input-output end are arranged in an alternating manner;

[0007] The first signal light emitted by the optical transmission group passes through the optical circulator and then enters the first input-output end, and the second signal light emitted by the optical transmission group passes through the optical circulator and then enters the second input-output end after being reflected by the optical turning element;

[0008] The third signal light emitted from the first input / output end passes through the optical circulator and then enters the optical receiving group. The fourth signal light emitted from the second input / output end is reflected by the optical turning element and then passes through the optical circulator and then enters the optical receiving group.

[0009] Furthermore, the optical emission group is a wavelength-adjustable optical emission group, and the wavelength of the first signal light is different from the wavelength of the second signal light.

[0010] Furthermore, it also includes a filter, which is arranged between the first input and output ends and the light turning element. The first signal light passing through the light turning element enters the first input and output ends after passing through the filter, and the second signal light enters the light turning element again after being reflected by the filter, and enters the second input and output ends after being reflected by the light turning element.

[0011] Furthermore, the light deflection element has an outer shape of an asymmetric trapezoid, and the sizes of the two included angles of the bottom sides of the trapezoid are not equal.

[0012] Furthermore, it also includes a filter component disposed between the optical circulator and the optical deflection element, wherein the filter component includes an optical deviation element close to the optical circulator and a filter facing away from the optical circulator.

[0013] Furthermore, one of the first signal light and the second signal light passing through the optical shifting element can pass through the filter; while the other signal light is reflected by the filter and then enters the optical shifting element again, and leaves the optical shifting element after being reflected and shifted a certain distance by the optical shifting element.

[0014] Furthermore, the light deflection element is in the shape of a parallelogram; the light deflection element is provided with an anti-reflection film in a local area on a side facing the optical circulator, and is provided with a high-reflection film in another local area.

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

[0016] Furthermore, the first signal light and the second signal light are emitted in parallel and have a spacing distance therebetween.

[0017] Furthermore, the light deflection element is in the shape of a parallelogram.

[0018] Furthermore, it also includes a light absorbing sheet arranged on a side of the optical circulator away from the light receiving group, and the light absorbing sheet is used to absorb stray light and reduce the stray light from entering the light receiving group.

[0019] Furthermore, it also includes an aperture arranged between the optical circulator and the light receiving group, and the aperture is provided with an opening to allow the third signal light and the fourth signal light to pass therethrough.

[0020] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

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

[0022] Figure 1 It is a structural schematic diagram of a dual-port optical transmitting and receiving component of the present invention using a dual-path optical transmitting group with the same wavelength.

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

[0024] Figure 3 yes Figure 1 The structural schematic diagram of the optical circulator shown in FIG.

[0025] Figure 4 yes Figure 3 Light path diagram of the optical circulator shown.

[0026] Figure 5 It is an optical path diagram of two signal lights being transmitted from a dual-port optical transmitting and receiving component of a dual-path optical transmitting group using the same wavelength to two input and output ends.

[0027] Figure 6 yes Figure 5 The optical path diagram of the first signal light is shown.

[0028] Figure 7 yes Figure 5 The optical path diagram of the second signal light is shown.

[0029] Figure 8 yes Figure 1 Another optical path diagram of the optical circulator shown.

[0030] Fig. 9 It is an optical path diagram of the two signal lights of the dual-port optical transmitting and receiving component being transmitted from the two input and output ends to the optical receiving group.

[0031] Fig.10 yes Fig. 9 The optical path diagram of the third signal light is shown.

[0032] Fig.11 yes Fig. 9 The optical path diagram of the fourth signal light is shown.

[0033] Fig.12 It is a structural schematic diagram of a dual-port optical transmitting and receiving component using an adjustable wavelength optical transmitting group.

[0034] Fig.13 yes Fig.12 The optical path diagram of the two signal lights of the dual-port optical transmitting and receiving component transmitted from the optical transmitting group to the two input and output ends.

[0035] Fig.14 yes Fig.13 The optical path diagram of the first signal light is shown.

[0036] Fig.15 yes Fig.13 The optical path diagram of the second signal light is shown.

[0037] Fig.16 yes Fig.13 Schematic diagram of the structure of the light turning element shown.

[0038] Fig.17 yes Fig.16 Light path diagram of the light turning element shown.

[0039] Fig.18 It is a schematic structural diagram of a second embodiment of a dual-port optical transmitting and receiving component using an adjustable wavelength optical transmitting group.

[0040] Fig.19 yes Fig.18 The optical path diagram of the two signal lights of the dual-port optical transmitting and receiving component transmitted from the optical transmitting group to the two input and output ends.

[0041] Fig. 20 It is a schematic structural diagram of a third embodiment of a dual-port optical transmitting and receiving component using an adjustable wavelength optical transmitting group.

[0042] Fig.21 yes Fig. 20 The optical path diagram of the two signal lights of the dual-port optical transmitting and receiving component transmitted from the optical transmitting group to the two input and output ends.

[0043] Fig. 22 yes Fig.12 The optical path diagram of the two signal lights of the dual-port optical transmitting and receiving component transmitted from the two input and output ends to the optical receiving group.

[0044] Fig.23 yes Fig. 22 The optical path diagram of the third signal light is shown.

[0045] Fig.24 yes Fig. 22 The optical path diagram of the fourth signal light is shown.

[0046] Fig.25 yes Fig.18 The optical path diagram of the signal light of the dual-port optical transmitting and receiving component is transmitted from the two input and output ends to the optical receiving group.

[0047] Fig.26 yes Fig. 20 The optical path diagram of the signal light of the dual-port optical transmitting and receiving component is transmitted from the two input and output ends to the optical receiving group.

[0048] The description of the accompanying drawings is as follows: 1. light emitting group; 11. first lens; 2. optical circulator; 21. first polarization beam splitter; 211. total reflection surface; 22. second polarization beam splitter; 23. wave plate; 24. Faraday rotation plate assembly; 3. light turning element; 4. first input and output end; 5. second input and output end; 6. light receiving group; 61. second lens; 7. filter; 71. light shifting element; 8. light absorbing plate; 9. aperture; 91. opening; 10. shell. DETAILED DESCRIPTION

[0049] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0050] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

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

[0052] The present invention provides a dual-port optical transmitting and receiving component. Figure 1The dual-port optical transmitting and receiving component includes an optical transmitting group 1, an optical circulator 2, an optical turning element 3, a first input and output end 4, a second input and output end 5 and an optical receiving group 6.

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

[0054] The light emitting group 1 is used to emit laser signal light. Figure 1 In the embodiment shown, the optical emission group 1 is a dual-path optical emission group with the same wavelength. Specifically, the dual-path optical emission group can emit a first signal light and a second signal light with the same wavelength. The dual-path optical emission group can achieve light separation of two channels through two built-in lenses with a spacing of 750 microns in the laser.

[0055] In addition, one or two first lenses 11 may be provided in front of the dual-path optical emission group. The first lens 11 is used to collimate the first signal light and the second signal light. Figure 2 When there are two first lenses 11, the two first lenses 11 can be used to collimate the first signal light and the second signal light respectively. The signal light beam output by the optical emission group 1 uses collimated light instead of conventional convergent light, which can increase the coupling efficiency and reduce the stray light generated by coupling mismatch.

[0056] See also Figure 3 The optical circulator 2 is a multi-port optical device with non-reciprocal characteristics. The optical circulator 2 includes two deflection beam splitters 21, 22, a wave plate 23 and a Faraday rotator assembly 24. The two deflection beam splitters are a first polarization beam splitter 21 and a second polarization beam splitter 22. A total reflection surface 211 is provided in a local area of ​​the first polarization beam splitter 21, and the signal light can be totally reflected on the total reflection surface 211. 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] See also Figure 1 Specifically, in this embodiment, the dual-port optical transmitting and receiving assembly further includes a light absorbing sheet 8. The light absorbing sheet 8 is disposed on a side (or upper side) of the optical circulator 2 away from the light receiving group 6, and the light absorbing sheet 8 is used to absorb stray light and reduce stray light from entering the light receiving group 6. The light absorbing sheet is made of light absorbing material.

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

[0059] For further information, see Figure 5 , Figure 5 The diagram is a schematic diagram of the optical path structure of the first signal light and the second signal light transmitted from the dual-path optical transmission group 1 to the first input-output terminal 4 and the second input-output terminal 5. There is a certain distance between the first signal light and the second signal light. In addition, the first signal light and the second signal light are emitted in parallel with each other. After being collimated by the first lens 11, the first signal light and the second signal light enter the optical circulator 2, and are emitted at a distance from the upper and lower sides of the optical circulator 2 close to the first input-output terminal 4.

[0060] Please refer to Figure 6 , Figure 6 : is an optical path diagram of the first signal light. The first signal light can directly enter the first input / output terminal 4 after passing through the optical circulator 2.

[0061] See also Figure 7 , Figure 7 The second signal light passes through the optical circulator 2 and then 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 and enters the second input / output end 5.

[0062] Specifically, the shape of the light deflection element 3 may be a parallelogram structure, and the two short oblique sides of the parallelogram may be reflection surfaces, so that the second signal light may be reflected twice by the light deflection element 3 and reach the second input / output end 5 .

[0063] The first input / output terminal 4 and the second input / output terminal 5 can both be used to transmit and receive signal light. For the convenience of description, this article takes "the first input / output terminal 4 transmits the third signal light, and the second input / output terminal 5 transmits the fourth signal light" as an example for description.

[0064] See also Figure 8 , Figure 8The optical path diagram of the third signal light or the fourth signal light of the dual-port optical transmitting and receiving component propagating in the optical circulator 2. When the third signal light or the fourth signal light enters the optical circulator 2, it first passes through the second polarization beam splitter 22 to be split into two polarized lights, then passes through the wave plate 23 and the Faraday rotator assembly 24, and finally passes through the first polarization beam splitter 21 to combine the lights and then emit downward and enter the optical receiving group 6.

[0065] See also Fig. 9 , Fig. 9 The optical path diagram of the third signal light and the fourth signal light transmitted from the two input and output ends to the light receiving group. Lenses (not shown) are provided on the light passing surfaces of the first input and output end 4 and the second input and output end 5. The bevel angle of the lens is relatively large. As the bevel angle increases, the misalignment between the reflected stray light and the signal light increases, reducing the energy proportion of the reflected stray light entering the light receiving group 6, thereby improving the signal-to-noise ratio.

[0066] Please refer to Fig.10 , Fig.10 : 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 close to the light receiving group 6, converged by the second lens 61, and received by the light receiving group 6.

[0067] See also Fig.11 , Fig.11 : is the optical path diagram of the fourth signal light. The fourth signal light is emitted from the second input / output terminal 5, and enters the optical circulator 2 after being reflected twice by the optical turning element 3. The fourth signal light passes through the optical circulator 2, and is emitted from the side of the optical circulator toward the light receiving group 6, and is converged by the second lens 61 and received by the light receiving group 6.

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

[0069] Specifically in this embodiment, the dual-port optical transmitting and receiving component may also include: Figure 1 The aperture 9 is shown. The aperture 9 is placed on the upper side of the light receiving group 6. The opening 91 of the aperture 9 allows the third signal light and the fourth signal light to pass therethrough, and the portion other than the opening 91 is used to block the stray light returned by the optical fiber bevel and the lens bevel. The surface of the aperture 9 is preferably covered with a light absorbing material to absorb the stray light falling on the aperture 9 to prevent secondary reflection from entering the light receiving group 6.

[0070] The first input-output terminal 4 can be used to transmit the third signal light and to receive the first signal light. The second input-output terminal 5 can be used to transmit the fourth signal light and to receive the second signal light. The first input-output terminal 4 and the second input-output terminal 5 are arranged in parallel and at intervals. Specifically in this embodiment, the spacing between the first input-output terminal 4 and the second input-output terminal 5 can be 6.25 mm, which can meet the requirements of the international electrical standard IEC 61754-20.

[0071] like Figure 5 and Fig. 9 As shown, the light turning element 3 is disposed on the light output side of the optical circulator 2 and the light input side of the second input / output end 5. It can be understood that the light turning element 3 can be disposed between the optical circulator 2 and the second input / output end 5.

[0072] The light turning element 3 can reflect the second signal light, so that the second signal light enters the second input / output end 5. In addition, the light turning element 3 can also reflect the fourth signal light emitted from the second input / output end 5, so that the fourth signal light enters the optical circulator 2. Specifically, the light turning element 3 can be a prism.

[0073] Specifically in this embodiment, the light passing surfaces of the optical circulator 2 and the light turning element 3 are preferably deflected at a certain angle relative to the optical path, and a deflection angle is formed between the light passing surfaces of the optical circulator 2 and the light turning element 3. Due to the introduction of the deflection angle, the reflected stray light generated by the light passing surfaces of the optical circulator 2 and the light turning element 3 is misaligned with the signal light, so that the reflected stray light falls on the non-opening part of the aperture 9, and thus cannot enter the light receiving group 6 through the opening 91, which is conducive to reducing the stray light entering the light receiving group 6.

[0074] Furthermore, specifically in this embodiment, at least one or more of the optical transmitting group 1, the optical circulator 2, the optical turning element 3, the first input and output end 4, the second input and output end 5 and the optical receiving group 6 are provided with an anti-reflection film to reduce the reflected stray light of the light-transmitting surface.

[0075] The structure of the dual-port optical transmitting and receiving assembly of the second embodiment is substantially similar to that of the first embodiment. The same parts are not repeated here. The main differences include that the optical transmitting group 1 in the second embodiment can be changed to an adjustable wavelength optical transmitting group, and the wavelength of the first signal light is different from the wavelength of the second signal light. Then the dual-port optical transmitting and receiving assembly is a dual-port optical transmitting and receiving assembly designed for adjustable wavelength.

[0076] See also Fig.12 , Fig.12 The structure diagram of the first embodiment of the dual-port optical transmitting and receiving component using the adjustable wavelength optical transmitting group is shown in FIG.

[0077] The filter 7 is arranged 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, the filter 7 can be arranged to transmit the first signal light and reflect the second signal light.

[0078] See also Fig.13 , Fig.13 The optical path diagram of the first signal light and the second signal light emitted from the adjustable wavelength optical emission group 1 and entering the first input-output terminal 4 and the second input-output terminal 5. The filter 7 transmits the first signal light and reflects the second signal light. The filter 7 can be arranged between the optical turning element 3 and the first input-output terminal 4. The filter 7 is arranged opposite to the first input-output terminal 4.

[0079] See also Fig.14 , Fig.14 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 turning element 3 and enters the filter 7, and then the first signal light passes through the filter 7 and directly enters the first input-output terminal 4.

[0080] See also Fig.15 , Fig.15 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 enters the optical turning element 3 again. After two reflections by the optical turning element 3, the second signal light is guided to the second input / output terminal 5.

[0081] See also Fig.16 and Fig.17 Specifically, the light deflection element 3 adopts an asymmetric trapezoidal structure. The two acute angles of the bottom side of the trapezoid, angle A and angle B, are not equal in size, so that the effect of adjusting the light path can be achieved. Fig.16 Specifically, the degree of angle A is less than the degree of angle B.

[0082] The optical path diagram of the signal light in the optical turning element 3 and the filter 7 is as follows: Fig.17 After passing through the light deflection element 3 and the filter 7, the two outgoing lights are parallel and the distance H is 6.25 mm. Then the distance between the first input-output terminal 4 and the second input-output terminal 5 can also be 6.25 mm.

[0083] See also Fig.18 and Fig.19 , Fig.18 This is a schematic structural diagram of a dual-port optical transmitting and receiving component of a wavelength-adjustable optical transmitting group according to a second embodiment. Fig.19 for Fig.18The schematic diagram of the optical path of two signal lights in the dual-port optical transmitting and receiving assembly is shown in FIG. 1 , which is transmitted from the adjustable wavelength optical transmitting group 1 to the first input-output port 4 and the second input-output port 5 .

[0084] exist Fig.18 In the embodiment, the filter 7 is arranged at the upper half of an optical shifting element 71 to form a filter assembly. The filter assembly includes the optical shifting element 71 close to the optical circulator 2 and the filter 7 facing away from the optical circulator 2. The optical shifting element 71 is in a parallelogram shape, and the side thereof attached to the filter 7 is gradually inclined from bottom to top toward the optical circulator 2. The filter assembly is arranged between the first input / output terminal 4 and the optical circulator 2. The filter 7 can be set to transmit the first signal light and reflect the second signal light.

[0085] See also Fig.19 , after the first signal light and the second signal light pass through the optical circulator 2, the first signal light and the second signal light pass through the optical shifting 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 enters the optical shifting element 71 again after being reflected by the filter 7, and after being reflected by the optical shifting element 71 and shifted downward for a certain distance, enters the optical turning element 3, and is guided to the second input-output terminal 5 through the optical path turning effect of the optical turning element 3. The optical shifting element 71 is preferably provided with an anti-reflection film in a local area on the side facing the optical circulator 2 for the first signal light and the second signal light to be incident, and a high-reflection film in another local area for reflecting the second signal light, so as to improve the signal quality.

[0086] See also Fig. 20 and Fig.21 , Fig. 20 It is a schematic structural diagram of a third embodiment of a dual-port optical transmitting and receiving component using an adjustable wavelength optical transmitting group. Fig.21 for Fig. 20 In the dual-port optical transmitting and receiving assembly shown, the optical path diagram of the signal light is transmitted from the adjustable wavelength optical transmitting group 1 to the first input-output port 4 and the second input-output port 5.

[0087] exist Fig. 20 In the embodiment, the filter 7 is arranged at the lower half of the optical shifting element 71 to form a filter assembly. The optical shifting element 71 is in the shape of a parallelogram, and the side thereof attached to the filter 7 is gradually inclined from top to bottom toward the optical circulator 2. The filter 7 is arranged to reflect the first signal light and transmit the second signal light.

[0088] See also Fig.21After the first signal light and the second signal light pass through the optical circulator 2, the first signal light and the second signal light enter the filter 7 through the optical shift element 71. After being reflected by the filter 7, the first signal light enters the optical shift element 71 again, and is reflected by the optical shift element 71 and emitted toward the first input / output end 4. The second signal light passes through the filter 7 and enters the optical turning element 3, and is guided to the second input / output end 5 through the optical path turning effect of the optical turning element 3. The optical shift element 71 is preferably provided with an anti-reflection film in a local area on the side facing the optical circulator 2 for the first signal light and the second signal light to be incident, and a high-reflection film in another local area for reflecting the first signal light, so as to improve the signal quality.

[0089] See also Fig. 22 , Fig. 22 for Fig.12 The optical path diagram of the third signal light and the fourth signal light of the dual-port optical transmitting and receiving assembly is shown. The third signal light and the fourth signal light are respectively emitted from the first input-output terminal 4 and the second input-output terminal 5, and finally all are received by the optical receiving group 6.

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

[0091] See also Fig.24 , Fig.24 : 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 turning element 3, enters the filter 7, and then reflected by the filter 7 to enter the optical circulator 2. The fourth signal light is reflected by the optical circulator 2, and finally emitted from the side of the optical circulator 2 close to the optical receiving group 6, converged by the second lens 61, and received by the optical receiving group 6.

[0092] Fig.25 for Fig.18The optical path diagram of the third signal light and the fourth signal light of the dual-port optical transmitting and receiving component shown. The third signal light is emitted from the first input-output terminal 4, passes through the filter 7 and the optical turning element 3, and enters the optical circulator 2. The fourth signal light is emitted from the second input-output terminal 5, is reflected twice by the optical turning element 3, enters the optical shifting element 71, is reflected by the optical shifting element 71 and enters the filter 7, enters the optical shifting element 71 again after being reflected by the filter 7, and then passes through the optical shifting element 71 and enters the optical circulator 2. After passing through the optical circulator 2, the third signal light and the fourth signal light are finally emitted from the side of the optical circulator 2 close to the optical receiving group 6, converged by the second lens 61, and received by the optical receiving group 6.

[0093] Fig.26 for Fig. 20 The optical path diagram of the third signal light and the fourth signal light of the dual-port optical transmitting and receiving assembly shown. The third signal light is emitted from the first input-output terminal 4, first reflected by the optical shift element 71 to the filter 7, and then reflected by the filter and enters the optical shift element 71 again, and enters the optical circulator 2 after passing through the optical shift element 71. The fourth signal light is emitted from the second input-output terminal 5, and after being reflected twice by the optical turning element 3, enters the filter 7, and enters the optical circulator 2 after passing through the filter 7 and the optical shift element 71 in sequence. After passing through the optical circulator 2, the third signal light and the fourth signal light are finally emitted from the side of the optical circulator 2 close to the optical receiving group 6, converged by the second lens 61, and received by the optical receiving group 6.

[0094] Among them Fig.12 In the dual-port optical transmitting and receiving assembly shown in FIG. Fig.14 The first signal light transmitted from the light emitting group 1 to the first input-output terminal 4 is Fig.23 The third signal light transmitted from the first input-output terminal 4 to the light receiving group 6 is a group of signal lights having the same wavelength.

[0095] And as Fig.15 The second signal light transmitted from the light emitting group 1 to the second input / output terminal 5 is Fig.24 The fourth signal light transmitted from the second input-output terminal 5 to the light receiving group 6 is another group of signal lights having the same wavelength.

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

[0097] The above-mentioned dual-port optical transmitting and receiving assembly can realize the transmission of the first signal light and the second signal light from the optical transmitting group 1 to the first input and output end 4 and the second input and output end 5 respectively through the dual-path optical transmitting group, the optical circulator 2 and the optical turning element 3, and can also realize the transmission of the third signal light and the fourth signal light from the first input and output end 4 and the second input and output end 5 to the optical receiving group 6. Therefore, the dual-port optical transmitting and receiving assembly of the present invention includes four optical paths, and the input channel and the output channel can use signal lights of different wavelengths, which greatly improves the utilization rate of the channel. In addition, the size of the above-mentioned dual-port optical transmitting and receiving assembly is compatible with the small form factor pluggable double density (SFP-DD) multi-source agreement (MSA) standard and greatly reduces the cost. At the same time, the four optical paths all use the same set of splitting core components: optical circulator 2 and optical turning element 3, which achieves extremely high integration, improves space utilization, makes it compatible with the standard of SFP hot-swappable module in size, and greatly reduces costs.

[0098] In addition, the dual-port optical transmitting and receiving assembly of the present invention uses an optical circulator 2 to realize the transmission and reception of the optical path, and also has the characteristics of low loss and insensitivity to the polarization state of the transmitted and received signal light. It can be applied to application scenarios with high requirements on channel utilization, space, cost, and loss, such as a highly integrated optical time domain reflectometer OTDR (Optical Time Domain Reflectometer).

[0099] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of 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, so all changes 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 transmitting and receiving component, characterized in that: include: An optical transmitting group, an optical circulator, an optical turning element, a first input-output end and a second input-output end, and an optical receiving group, wherein the first input-output end and the second input-output end are arranged in an alternating manner; The first signal light emitted by the optical transmission group passes through the optical circulator and then enters the first input-output end, and the second signal light emitted by the optical transmission group passes through the optical circulator and then enters the second input-output end after being reflected by the optical turning element; The third signal light emitted from the first input / output end passes through the optical circulator and then enters the optical receiving group. The fourth signal light emitted from the second input / output end is reflected by the optical turning element and then passes through the optical circulator and then enters the optical receiving group.

2. The dual-port optical transmitting and receiving component according to claim 1, characterized in that: The light emission group is a wavelength-adjustable 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 transmitting and receiving component according to claim 2, characterized in that: It also includes a filter, which is arranged between the first input and output ends and the light turning element. The first signal light passing through the light turning element enters the first input and output ends after passing through the filter, and the second signal light enters the light turning element again after being reflected by the filter, and enters the second input and output ends after being reflected by the light turning element.

4. The dual-port optical transmitting and receiving component according to claim 3, characterized in that: The light deflection element has an asymmetric trapezoidal shape, and the sizes of the two included angles of the bottom sides of the trapezoid are not equal.

5. The dual-port optical transmitting and receiving component according to claim 2, characterized in that: The invention also comprises a filter assembly arranged between the optical circulator and the optical deflection element. The filter assembly comprises an optical deviation element close to the optical circulator and a filter facing away from the optical circulator.

6. The dual-port optical transmitting and receiving component according to claim 5, characterized in that: One of the first signal light and the second signal light passing through the optical shifting element can pass through the filter; while the other signal light is reflected by the filter and then enters the optical shifting element again, and leaves the optical shifting element after being reflected and shifted a certain distance by the optical shifting element.

7. The dual-port optical transmitting and receiving component according to claim 5, characterized in that: The shape of the light deflection element is a parallelogram; the light deviation element is provided with an anti-reflection film in a local area on a side facing the optical circulator, and a high-reflection film in another local area.

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

9. The dual-port optical transmitting and receiving component according to claim 8, characterized in that: The first signal light and the second signal light are emitted in parallel and have a spacing distance therebetween.

10. The dual-port optical transmitting and receiving component according to claim 8, characterized in that: The light deflection element is in the shape of a parallelogram.

11. The dual-port optical transmitting and receiving component according to claim 1, characterized in that: It also includes a light absorbing sheet arranged on a side of the optical circulator away from the light receiving group, and the light absorbing sheet is used to absorb stray light and reduce the stray light from entering the light receiving group.

12. The dual-port optical transmitting and receiving component according to claim 1, characterized in that: It also includes an aperture arranged between the optical circulator and the light receiving group, and the aperture is provided with an opening to allow the third signal light and the fourth signal light to pass therethrough.

Images