Low-crosstalk same-wavelength BOSA optical device

Abstract

The utility model relates to the technical field of optical communication, in particular to a low-crosstalk same-wavelength BOSA optical device, which is characterized in that a circulator assembly is packaged in the BOSA device, so that the size of the device is greatly reduced compared with that of a device packaged by a conventional circulator, and the low-crosstalk same-wavelength BOSA optical device has the advantage of high coupling efficiency compared with a BOSA optical device packaged by a conventional 45-degree slide scheme; the end faces of the spherical lens and the single-mode insertion core are provided with the inclined planes with the first preset angles, so that compared with a conventional mode that a convergent lens is coupled with an insertion core assembly, the influence of reflected light between the convergent lens and the end face of an insertion pin on a detector is reduced; and the antireflection film is arranged on the inclined surface, so that the reflection of the signal light emitted by the light emitting assembly by the end surface of the spherical lens and the end surface of the single-mode insertion core can be reduced, the crosstalk of the light emitting assembly to the light receiving assembly is reduced, and the return loss of the BOSA optical device can be increased.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, and in particular to a low crosstalk co-wavelength BOSA optical device. Background Technology

[0002] With the continuous development of optical communication technology and the advancement of optical applications, the industry has higher demands for the performance, cost, and packaging size of Optical Time Domain Reflectometer (OTDR) optical modules. Bi-Directional Optical Sub-Assembly (BOSA) includes an adapter, a transmitting component, a receiving component, and a round / square tube housing. The transmitting component can be in a TO (Transisitor Outline) package, while the receiving component is generally in a TO package. The round / square tube housing includes metal parts, filters, isolators, absorbers, and other components.

[0003] However, traditional same-wavelength BOSAs use 45° filters for beam splitting, and the components in the round and square tubes of BOSAs are designed separately. This leads to problems such as low coupling efficiency, excessive crosstalk, difficulty in controlling the overall length of the device, and interference from the optical receiver subassembly (ROSA) in the optical module. As a result, it cannot meet the requirements of the trend of "miniaturization and integration" of devices.

[0004] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Utility Model Content

[0005] The technical problem to be solved by this invention is how to address the issues of low coupling efficiency and excessive crosstalk in existing BOSA devices.

[0006] The present invention adopts the following technical solution:

[0007] This invention provides a low crosstalk same-wavelength BOSA optical device, including an adapter assembly 1, a circulator assembly 2, an optical receiver assembly 3, an optical transmitter assembly 4, and a mounting tube 5. The circulator assembly 2 is disposed in the inner cavity of the mounting tube 5. The adapter assembly 1 is disposed at the first port of the mounting tube 5 and corresponds to the first port of the circulator assembly 2. The optical receiver assembly 3 is disposed at the second port of the mounting tube 5 and corresponds to the second port of the circulator assembly 2. The optical transmitter assembly 4 is disposed at the third port of the mounting tube 5 and corresponds to the third port of the circulator assembly 2.

[0008] The adapter assembly 1 includes a spherical lens 10 and a single-mode ferrule 11 coupled sequentially along the optical path. The spherical lens 10 is coupled to the first port of the circulator assembly 2. Anti-reflective coatings are provided on the coupling end faces of the single-mode ferrule 11 and the spherical lens 10, respectively, and are respectively at a first preset angle.

[0009] Preferably, the adapter assembly 1 further includes a pin socket 12, a ceramic sleeve 13, and a metal sleeve 14;

[0010] The spherical lens 10 and the single-mode ferrule 11 are sequentially arranged in the pin holder 12, the ceramic sleeve 13 is sleeved on one end of the single-mode ferrule 11, and the metal sleeve 14 is sleeved on a portion of the ceramic sleeve 13.

[0011] Preferably, the circulator assembly 2 includes a first prism unit 20, a Faraday rotator 21, a half-wave plate 22, and a second prism unit 23 arranged sequentially; the Faraday rotator 21 and the half-wave plate 22 are arranged sequentially between the vertical planes of the first prism unit 20 and the second prism unit 23.

[0012] Preferably, the first prism unit 20 includes a first optical prism 200 and a second optical prism 201, and each of the second prism units 23 includes a third optical prism 230 and a fourth optical prism 231.

[0013] The 45° surfaces where the first optical prism 200 and the second optical prism 201 meet are coated with a polarization separation film, and the 45° surfaces where the third optical prism 230 and the fourth optical prism 231 meet are coated with a polarization separation film.

[0014] The first optical prism 200 has a 45° surface in contact with air coated with a high-reflectivity film, and the third optical prism 230 has a 45° surface in contact with air coated with a high-reflectivity film.

[0015] The signal light emitted by the light emitting component 4 passes sequentially through the first optical prism 200, the second optical prism 201, the Faraday rotator 21, the half-wave plate 22, the third optical prism 230, and the fourth optical prism 231 to be output from the first port of the circulator component 2 to the adapter component 1;

[0016] The received light from the adapter assembly 1 passes sequentially through the third optical prism 230, the fourth optical prism 231, the half-wave plate 22, the Faraday rotator 21, the first optical prism 200, and the second optical prism 201 to be output from the second port of the circulator assembly 2 to the light receiving assembly 3.

[0017] Preferably, the circulator assembly 2 further includes a bottom magnet 24, and the first prism unit 20, the Faraday rotator 21, the half-wave plate 22 and the second prism unit 23 are all mounted on the bottom magnet 24 at a second preset angle, and then mounted in the inner cavity of the mounting tube 5.

[0018] Preferably, the BOSA optical device further includes a relay lens 6, which is disposed between the third port of the circulator assembly 2 and the light emitting assembly 4.

[0019] Preferably, the light emitting component 4 includes a laser chip 40 and a converging lens 41 arranged sequentially;

[0020] The optical signal output by the laser chip 40 passes sequentially through the converging lens 41, the relay lens 6, and the third port of the circulator assembly 2 to obtain signal light, which is then output from the adapter assembly 1.

[0021] Preferably, the optical receiving assembly 3 includes a receiving tube 30, a flat window TO cap 31, a transimpedance amplifier 32, a photodetector chip 33, and a receiving lens 34; the transimpedance amplifier 32, the photodetector chip 33, the flat window TO cap 31, and the receiving lens 34 are sequentially disposed in the receiving tube 30; the receiving lens 34 is coupled to the second port of the circulator assembly 2.

[0022] Preferably, the BOSA optical device further includes a 0° filter 7, which is disposed in the mounting tube 5 and is coupled to the second port of the circulator assembly 2 and the receiving lens 34, respectively.

[0023] Preferably, the BOSA optical device further includes a mounting cover plate 8, which is disposed on one side of the mounting tube 5.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] This invention significantly reduces the size of the BOSA device by encapsulating the circulator assembly 2 within it, compared to conventional circulator-encapsulated devices. Compared to conventional BOSA optical devices encapsulated with a 45° glass plate, it offers the advantage of high coupling efficiency. The end faces of both the spherical lens 10 and the single-mode ferrule 11 are provided with inclined surfaces at a first preset angle. Compared to conventional coupling between the converging lens and the ferrule assembly, this reduces the impact of reflected light between the converging lens and the ferrule end face on the detector. Furthermore, the anti-reflection coating on the inclined surfaces reduces the reflection of signal light emitted from the light emitting assembly 4 by the end faces of the spherical lens 10 and the single-mode ferrule 11, thereby reducing crosstalk between the light emitting assembly 4 and the light receiving assembly 3, while also increasing the return loss of the BOSA optical device. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a low crosstalk co-wavelength BOSA optical device provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of an adapter assembly provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of a circulator assembly provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of another circulator assembly provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the optical path in a circulator assembly provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the transmission direction of signal light provided in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the transmission direction of received light provided in an embodiment of this utility model;

[0034] Figure 8 This is a more specific structural schematic diagram of a low crosstalk same-wavelength BOSA optical device provided in an embodiment of the present invention.

[0035] In all the accompanying drawings, the same reference numerals denote the same structure, wherein:

[0036] Adapter assembly 1, spherical lens 10, single-mode ferrule 11, pin socket 12, ceramic sleeve 13, metal sleeve 14, circulator assembly 2, first prism unit 20, first optical prism 200, second optical prism 201, Faraday rotator 21, half-wave plate 22, second prism unit 23, third optical prism 230, fourth optical prism 231, bottom magnet 24, light receiving assembly 3, receiving tube 30, flat window TO cap 31, transimpedance amplifier 32, light detection chip 33, receiving lens 34, light emitting assembly 4, laser chip 40, converging lens 41, mounting tube 5, first lens slot, second lens slot, relay lens 6, 0° filter 7, mounting cover plate 8. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as openly inclusive, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples; that is, although they may be incorporated into embodiments or examples using the above terms for reasons such as order and position, it does not limit them to be incorporated in combination by a single embodiment or example.

[0039] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, for example, the description may use the prefix "A" or "B" to describe the same type of nouns as two independent entities. In this case, the features defined with "A" and "B" are used only to distinguish between similar entities and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0040] In describing some embodiments, the terms "coupled," "coupled," and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "connected" or "coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other, such as "optical coupling" or "wireless connection." The embodiments disclosed herein are not necessarily limited to the scope of this invention.

[0041] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0042] Example 1:

[0043] To address the problems of the prior art, in one embodiment, a low-crosstalk co-wavelength BOSA optical device is provided, such as... Figure 1 As shown, the device includes an adapter assembly 1, a circulator assembly 2, a light receiving assembly 3, a light emitting assembly 4, and a mounting tube 5. The circulator assembly 2 is disposed in the inner cavity of the mounting tube 5. The adapter assembly 1 is disposed at the first port of the mounting tube 5 and corresponds to the first port of the circulator assembly 2. The light receiving assembly 3 is disposed at the second port of the mounting tube 5 and corresponds to the second port of the circulator assembly 2. The light emitting assembly 4 is disposed at the third port of the mounting tube 5 and corresponds to the third port of the circulator assembly 2.

[0044] like Figure 2 As shown, the adapter assembly 1 includes a spherical lens 10 and a single-mode ferrule 11 sequentially coupled along the optical path. The spherical lens 10 is coupled to the first port of the circulator assembly 2. Anti-reflective coatings are provided on the coupling end faces of both the single-mode ferrule 11 and the spherical lens 10, and are respectively at a first preset angle. The first preset angle can be 8°, and in other embodiments, it can be other degrees.

[0045] The circulator assembly 2 is located within the cavity of the mounting tube 5 and is used for optical path switching and isolation. The circulator assembly 2 includes at least three ports for interconnecting other components. The adapter assembly 1 introduces external optical signals into the optical device or outputs internal optical signals to the outside for connection with external optical fibers. The optical receiving assembly 3 receives the optical signals transmitted through the circulator assembly 2 and converts them into electrical signals or other forms of signals for subsequent processing. The optical transmitting assembly 4 converts electrical signals into optical signals and transmits them to the outside via the circulator assembly 2 and the adapter assembly 1.

[0046] In the adapter assembly 1, the spherical lens 10 refracts and converges the optical signal, allowing it to be transmitted at a suitable angle and in a suitable manner. The single-mode ferrule 11 is used to fix and guide the single-mode fiber, ensuring stable transmission of the optical signal within it. Coupled with the spherical lens 10, it ensures that the optical signal exiting the spherical lens 10 accurately enters the single-mode fiber corresponding to the single-mode ferrule 11. Anti-reflection coatings are provided on the coupling end faces of both the single-mode ferrule 11 and the spherical lens 10. The anti-reflection coating reduces reflection of the optical signal at the interface between the two optical elements, increases the transmittance of the optical signal, thereby enhancing the overall performance of the optical device and reducing light energy loss. Setting the coupling end faces of the single-mode ferrule 11 and the spherical lens 10 at a first preset angle allows the optical signal to be transmitted between them, satisfying specific optical principles and optical path requirements. This allows the optical signal to be refracted at a specific angle, achieving better optical path matching and signal transmission, and reducing signal scattering and crosstalk.

[0047] In one embodiment, the antireflective membrane may be made of Ta2O5.

[0048] In one embodiment, refer to Figure 2 The adapter assembly 1 further includes a pin holder 12, a ceramic sleeve 13, and a metal sleeve 14. The spherical lens 10 and the single-mode ferrule 11 are sequentially disposed in the pin holder 12. The ceramic sleeve 13 is sleeved on one end of the single-mode ferrule 11, and the metal sleeve 14 is sleeved on a portion of the ceramic sleeve 13. The single-mode ferrule 11 and the metal sleeve 14 are both interference-fitted with the pin holder 12. An interference fit utilizes the elasticity of the material to enlarge and deform the hole, allowing it to fit onto the shaft. When the hole returns to its original shape, it generates a clamping force on the shaft, connecting the two components. Here, the shaft is the single-mode ferrule 11, and the hole is the mounting hole in the pin holder 12 and the metal sleeve 14.

[0049] The pin holder 12 provides a stable mounting position for the spherical lens 10 and the single-mode ferrule 11, ensuring that the two are accurately and sequentially arranged along the optical path.

[0050] The ceramic sleeve 13 plays two main roles. First, ceramic materials possess excellent wear resistance and high-precision machining performance. When the single-mode ferrule 11 is connected to other optical fibers or undergoes insertion / removal operations, the ceramic sleeve 13 protects the end face of the single-mode ferrule 11, reducing wear and ensuring the smoothness and precision of the end face, thereby ensuring efficient coupling and transmission of optical signals. Second, the ceramic sleeve 13 also possesses a certain degree of dimensional accuracy and stability, enabling accurate positioning of the single-mode ferrule 11 and maintaining a precise relative position with the spherical lens 10. This facilitates accurate transmission and coupling of optical signals, further reducing optical signal loss and crosstalk.

[0051] The metal sleeve 14 is fitted onto part of the ceramic sleeve 13, serving to enhance structural strength and provide protection. The metal material possesses high strength and rigidity, providing additional mechanical protection for the ceramic sleeve 13 and the internal single-mode ferrule 11, preventing the ceramic sleeve 13 from cracking or being damaged by external forces during use. Furthermore, the metal sleeve 14 also provides a degree of shielding, reducing the impact of external electromagnetic interference on optical signal transmission, improving the anti-interference capability of the optical device, and ensuring the stability and reliability of optical signal transmission. Simultaneously, the presence of the metal sleeve 14 facilitates the mechanical connection and fixation of the adapter assembly 1 with other components (such as the mounting tube 5), enhancing the overall integrity and robustness of the entire optical device structure.

[0052] In one embodiment, such as Figure 3 and Figure 4 As shown, the circulator assembly 2 includes a first prism unit 20, a Faraday rotator 21, a half-wave plate 22, and a second prism unit 23 arranged sequentially; wherein the first prism unit 20 and the second prism unit 23 are centrally symmetrical; the Faraday rotator 21 and the half-wave plate 22 are sequentially disposed between the vertical planes of the first prism unit 20 and the second prism unit 23. The vertical planes of the first prism unit 20 and the second prism unit 23 refer to... Figure 3 The vertically corresponding surfaces of the first prism unit 20 and the second prism unit 23 in the middle.

[0053] In one embodiment, refer to Figure 3 and Figure 4The first prism unit 20 includes a first optical prism 200 and a second optical prism 201, and the second prism unit 23 includes a third optical prism 230 and a fourth optical prism 231. The first optical prism 200 and the third optical prism 230 are centrally symmetrical, and the second optical prism 201 and the fourth optical prism 231 are centrally symmetrical. The 45° surfaces where the first optical prism 200 and the second optical prism 201 meet are coated with polarization separation films, and the 45° surfaces where the third optical prism 230 and the fourth optical prism 231 meet are coated with polarization separation films. The 45° surface of the first optical prism 200 that is in contact with air is coated with a high-reflectivity film, and the 45° surface of the third optical prism 230 that is in contact with air is coated with a high-reflectivity film.

[0054] The first optical prism 200 and the third optical prism 230 have the same structure, and the second optical prism 201 and the fourth optical prism 231 have the same structure.

[0055] In one embodiment, such as Figure 5 and Figure 6 As shown, the signal light emitted by the light emitting component 4 passes sequentially through the first optical prism 200, the second optical prism 201, the Faraday rotator 21, the half-wave plate 22, the third optical prism 230, and the fourth optical prism 231 to be output from the first port of the circulator component 2 to the adapter component 1; as Figure 5 and Figure 7 As shown, the received light from the adapter assembly 1 passes sequentially through the third optical prism 230, the fourth optical prism 231, the half-wave plate 22, the Faraday rotator 21, the first optical prism 200, and the second optical prism 201 to be output from the second port of the circulator assembly 2 to the light receiving assembly 3.

[0056] Let the coupling surface of the first optical prism 200 and the second optical prism 201 be the first coupling surface (as shown in A), and the coupling surface of the third optical prism 230 and the fourth optical prism 231 be the second coupling surface (as shown in B). The signal light (solid line in the figure) is incident from a vertical surface of the first optical prism 200 (i.e., the third port of the circulator assembly 2), passes through the first coupling surface and is output from a vertical surface of the second optical prism 201, passes sequentially through the Faraday rotator 21 and the half-wave plate 22 and is then incident on a vertical surface of the third optical prism 230, then reflected by a 45° surface of the third optical prism 230 to the second coupling surface, reflected again by the second coupling surface and output from the other vertical surface of the third optical prism 230 (i.e., the first port of the circulator assembly 2).

[0057] The received light (as shown by the dotted line in the figure) enters from another vertical surface of the third optical prism 230 (i.e., the first port of the circulator assembly 2), passes through the second coupling surface and exits from a vertical surface of the fourth optical prism 231, passes sequentially through the half-wave plate 22 and the Faraday rotator 21 and then enters a vertical surface of the first optical prism 200, is reflected by a 45° surface of the first optical prism 200 to the first coupling surface, is transmitted through the first coupling surface and exits from the second optical prism 201 (i.e., the second port of the circulator assembly 2).

[0058] In one embodiment, refer to Figure 3 and Figure 4 The circulator assembly 2 further includes a bottom magnet 24. The first prism unit 20, the Faraday rotator 21, the half-wave plate 22, and the second prism unit 23 are all mounted on the bottom magnet 24 at a second preset angle, and then assembled in the inner cavity of the mounting tube 5. The second preset angle can be 3°; mounting at a 3° angle can reduce the return loss of the BOSA optical device.

[0059] In one embodiment, such as Figure 6 and Figure 8 As shown, the BOSA optical device also includes a relay lens 6, which is disposed between the third port of the circulator assembly 2 and the light emitting assembly 4. A first lens slot (not shown) is provided in the mounting tube 5 corresponding to the third port of the circulator assembly 2, and the relay lens 6 is disposed in the first lens slot. The relay lens 6 is an aspherical collimating lens, used to convert the signal light emitted from the light emitting assembly 4 into parallel light, so that it can be incident on the third port of the circulator assembly 2.

[0060] In one embodiment, refer to Figure 8 The light emitting component 4 includes a laser chip 40 and a converging lens 41 arranged sequentially. The light signal output by the laser chip 40 passes sequentially through the converging lens 41, the relay lens 6, and the third port of the circulator component 2 to obtain signal light, which is then output from the adapter component 1. The laser chip 40 can be a laser without a cooler or a laser with a cooler. The laser chip 40 can be a directly modulated laser (DML) or an externally modulated laser (EML) modulated laser chip 40.

[0061] In one embodiment, refer to Figure 8The light receiving assembly 3 includes a receiving tube 30, a flat-window TO cap 31, a transimpedance amplifier 32, a photodetector chip 33, and a receiving lens 34. The transimpedance amplifier 32, the photodetector chip 33, the flat-window TO cap 31, and the receiving lens 34 are sequentially disposed within the receiving tube 30. The receiving lens 34 is coupled to the second port of the circulator assembly 2. The photodetector chip 33 can be an avalanche photodiode (APD). The receiving lens 34 is an aspherical converging lens used to convert the parallel light output from the circulator assembly 2 into converged light.

[0062] In one embodiment, refer to Figure 8 The BOSA optical device further includes a 0° filter 7, which is disposed in the mounting tube 5 and coupled to both the second port of the circulator assembly 2 and the receiving lens 34. The 0° filter 7 is used to filter the optical signal from the second port of the circulator assembly 2 to obtain the received light.

[0063] In one embodiment, refer to Figure 8 The BOSA optical device also includes a mounting cover plate 8, which is disposed on one side of the mounting tube 5.

[0064] The inner cavity of the mounting tube 5 is attached to the top of the circulator assembly 2 and has a recessed groove (not shown in the figure), and the mounting cover plate 8 is disposed in the groove.

[0065] In one embodiment, the mounting tube 5 has a square opening (not labeled in the figure) directly above the circulator assembly 2, which facilitates both the mounting of the circulator assembly 2 and the observation of the mounting position of the circulator assembly 2.

[0066] In summary, this embodiment significantly reduces the size of the device by encapsulating the circulator component 2 into the BOSA device compared to conventional circulator-encapsulated devices. Compared to conventional BOSA optical devices encapsulated with a 45° glass plate, it has the advantage of high coupling efficiency. The end faces of the spherical lens 10 and the single-mode ferrule 11 are both provided with inclined surfaces at a first preset angle, and anti-reflection films are provided on the inclined surfaces to reduce the reflection of signal light emitted by the light emitting component 4 from the end faces of the spherical lens 10 and the single-mode ferrule 11, thereby reducing the crosstalk between the light emitting component 4 and the light receiving component 3, and also increasing the return loss of the BOSA optical device.

[0067] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low crosstalk co-wavelength BOSA optical device, characterized in that, The application relates to an optical adapter, which comprises an adapter assembly (1), a circulator assembly (2), a light receiving assembly (3), a light emitting assembly (4) and a mounting pipe body (5); the circulator assembly (2) is arranged in the inner cavity of the mounting pipe body (5), the adapter assembly (1) is arranged at the first port of the mounting pipe body (5) and corresponds to the first port of the circulator assembly (2); the light receiving assembly (3) is arranged at the second port of the mounting pipe body (5) and corresponds to the second port of the circulator assembly (2); and the light emitting assembly (4) is arranged at the third port of the mounting pipe body (5) and corresponds to the third port of the circulator assembly (2). The adapter assembly (1) comprises a spherical lens (10) and a single-mode ferrule (11) which are sequentially arranged in the light path and are coupled; the spherical lens (10) is coupled with the first port of the circulator assembly (2); and the coupling end faces of the single-mode ferrule (11) and the spherical lens (10) are provided with antireflection films and are respectively provided with a first preset angle.

2. The low crosstalk in-line BOSA optical device according to claim 1, wherein, The adapter assembly (1) further comprises a pin holder (12), a ceramic sleeve (13) and a metal sleeve (14). The spherical lens (10) and the single-mode ferrule (11) are sequentially arranged in the pin holder (12), the ceramic sleeve (13) is sleeved on one end of the single-mode ferrule (11), and the metal sleeve (14) is sleeved on part of the ceramic sleeve (13).

3. The low crosstalk in-line BOSA optical device according to claim 1, wherein, The circulator assembly (2) comprises a first prism unit (20), a Faraday optical rotator (21), a half-wave plate (22) and a second prism unit (23) which are sequentially arranged; the Faraday optical rotator (21) and the half-wave plate (22) are sequentially arranged between the vertical faces of the first prism unit (20) and the second prism unit (23).

4. The low crosstalk same-wavelength BOSA optical device according to claim 3, characterized in that, The first prism unit (20) comprises a first optical prism (200) and a second optical prism (201), and the second prism unit (23) comprises a third optical prism (230) and a fourth optical prism (231); The 45-degree faces of the first optical prism (200) and the second optical prism (201) are coated with polarization separation films, and the 45-degree faces of the third optical prism (230) and the fourth optical prism (231) are coated with polarization separation films; The 45-degree face of the first optical prism (200) in contact with air is coated with a high-reflection film, and the 45-degree face of the third optical prism (230) in contact with air is coated with a high-reflection film; The signal light emitted by the light emitting assembly (4) sequentially passes through the first optical prism (200), the second optical prism (201), the Faraday optical rotator (21), the half-wave plate (22), the third optical prism (230) and the fourth optical prism (231) to be output from the first port of the circulator assembly (2) to the adapter assembly (1). The received light from the adapter assembly (1) sequentially passes through the third optical prism (230), the fourth optical prism (231), the half-wave plate (22), the Faraday rotator (21), the first optical prism (200) and the second optical prism (201) to output from the second port of the circulator assembly (2) to the light receiving assembly (3).

5. The low crosstalk same-wavelength BOSA optical device according to claim 3, wherein, The circulator assembly (2) further comprises a bottom magnetic block (24), and the first prism unit (20), the Faraday rotator (21), the half-wave plate (22) and the second prism unit (23) are assembled on the bottom magnetic block (24) at a second preset angle, and are further assembled in the inner cavity of the mounting pipe body (5).

6. The low crosstalk same-wavelength BOSA optical device according to claim 1, wherein, The BOSA optical device further comprises a relay lens (6) arranged between the third port of the circulator assembly (2) and the light emitting assembly (4).

7. The low crosstalk same-wavelength BOSA optical device according to claim 6, wherein, The light emitting assembly (4) comprises a laser chip (40) and a converging lens (41) arranged in sequence. The light signal output by the laser chip (40) sequentially passes through the converging lens (41), the relay lens (6) and the third port of the circulator assembly (2) to obtain signal light and output from the adapter assembly (1).

8. The low crosstalk in-line BOSA optical device of claim 1, wherein, The light receiving assembly (3) comprises a receiving pipe body (30), a flat window TO cap (31), a transimpedance amplifier (32), a light detection chip (33) and a receiving lens (34); the transimpedance amplifier (32), the light detection chip (33), the flat window TO cap (31) and the receiving lens (34) are arranged in the receiving pipe body (30) in sequence; and the receiving lens (34) is coupled with the second port of the circulator assembly (2).

9. The low crosstalk same-wavelength BOSA optical device according to claim 8, wherein, The BOSA optical device further comprises a 0° filter (7) arranged in the mounting pipe body (5), and the 0° filter (7) is coupled with the second port of the circulator assembly (2) and the receiving lens (34) respectively.

10. The low crosstalk in-line BOSA optical device of claim 1, wherein, The BOSA optical device further comprises a mounting cover plate (8) arranged on one side of the mounting pipe body (5).

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