A single fiber bidirectional optical module for radio frequency over fiber transmission

Abstract

The application relates to the technical field of optical communication, in particular to a single-fiber bidirectional optical module for optical fiber radio frequency transmission, which comprises a base, an optical transmitting assembly and an optical receiving assembly, the optical transmitting assembly and the optical receiving assembly are respectively arranged on two adjacent sides of the base, the optical transmitting assembly is used for transmitting multiple different wavelength lights, a containing cavity is arranged in the base, and a first filter is arranged in the containing cavity in an inclined mode; a pigtail assembly is arranged at one end of the base away from the optical transmitting assembly, wavelength light emitted by the optical transmitting assembly is incident to the pigtail assembly through the first filter, part of optical signals is reflected to the first filter through one end of the pigtail assembly, and the optical signals are reflected to the optical receiving assembly through the first filter. The application has the effect of meeting the intensity requirements of different products on wavelength light.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical communication, and in particular to a single-fiber bidirectional optical module for radio frequency over fiber. BACKGROUND

[0002] At present, the loss and interference sensitivity of radio frequency coaxial cables used to maintain the reasonable cost of network infrastructure in optical communication products is much greater than that of optical fibers or higher quality coaxial cables, which can cause insufficient network performance of hybrid fiber coaxial cables (HFC). To solve such problems, the market uses a radio frequency over fiber (RFoG) method, which can use a single-mode optical fiber instead of a coaxial cable for long-distance operation in a passive optical network (PON) or a gigabit passive optical network (GPON). The common RFoG one-receiving-one-transmitting BOSA optical assembly on the market uses a 45° filter to separate the wavelength 1610 nm of the transmitting signal and the wavelength 1550 nm of the receiving signal, so as to realize long-distance operation of the single-mode optical fiber of the optical communication product.

[0003] For the related technologies in the above: different products have different requirements for the intensity of wavelength light, and the wavelength range of a single one-receiving-one-transmitting BOSA optical assembly is usually limited, so there is a problem that the one-receiving-one-transmitting BOSA optical assembly cannot meet the requirements of different products for the intensity of wavelength light. SUMMARY

[0004] In order to meet the requirements of different products for the intensity of wavelength light, the present application provides a single-fiber bidirectional optical module for radio frequency over fiber.

[0005] The single-fiber bidirectional optical module for radio frequency over fiber provided by the present application adopts the following technical solution:

[0006] A single-fiber bidirectional optical module for radio frequency over fiber, comprising a base, an optical transmitting assembly and an optical receiving assembly, the optical transmitting assembly and the optical receiving assembly are respectively installed on two adjacent sides of the base, the optical transmitting assembly is used to transmit a plurality of different wavelength lights, a containing cavity is formed in the base, and a first filter is obliquely arranged in the containing cavity;

[0007] One end of the base away from the optical transmitting assembly is provided with a pigtail assembly, the pigtail assembly comprises an optical fiber ferrule and a protective sleeve arranged on one side of the circumference of the optical fiber ferrule, the protective sleeve is connected with the base, one end of the optical fiber ferrule is inserted into the containing cavity and is coaxially arranged with the optical transmitting assembly, and the first filter is located between the optical fiber ferrule, the optical transmitting assembly and the optical receiving assembly;

[0008] The wavelength light emitted by the light emitting assembly is incident on the optical fiber ferrule through the first filter, part of the optical signal is reflected to the first filter through one end of the optical fiber ferrule, and is reflected to the light receiving assembly through the first filter.

[0009] By adopting the above technical solution, the light emitting assembly can emit different wavelength light, thereby facilitating the emission of corresponding wavelength light according to the needs of the product, and to some extent, meeting the needs of different products for wavelength light intensity. And the wavelength light emitted by the light emitting assembly can pass through the first filter and enter the optical fiber ferrule. The optical signal emitted by the optical fiber ferrule can be reflected to the light receiving assembly by the first filter to be received by the light receiving assembly.

[0010] Optionally, the light emitting assembly is used to emit eight different wavelengths of light, and the eight different wavelengths of light are 1GCWDM 1371nm, 1391nm, 1411nm, 1431nm, 1451nm, 1471nm, 1511nm and 1611nm.

[0011] By adopting the above technical solution, the needs of different products for wavelength light intensity are further met.

[0012] Optionally, a slope clamping groove is formed in the inner wall of the accommodating cavity, and the first filter is inserted into the slope clamping groove.

[0013] By adopting the above technical solution, the first filter is inserted into the slope clamping groove, so that the inner wall of the slope clamping groove can stably support the first filter to reduce the possibility of shaking of the first filter.

[0014] Optionally, a limiting groove is formed in the inner wall of the accommodating cavity, the limiting groove is located on the side of the first filter close to the light emitting assembly, and an isolator is arranged in the limiting groove.

[0015] By adopting the above technical solution, the inner wall of the limiting groove can limit the isolator, so as to facilitate the installation of the isolator in the limiting groove, and the isolator can make the optical signal emitted by the light emitting assembly unidirectional to the first filter, and reduce the possibility of reverse propagation of the optical signal to the light emitting assembly, thereby facilitating to reduce the possibility of mutual interference of optical signals in two directions, resulting in the reduction of signal transmission quality.

[0016] Optionally, the protection cover is coaxially arranged at one end of the first filter plate, and a first through hole and a second through hole are respectively arranged on the protection cover along the axial direction of the protection cover, the first through hole and the second through hole are in communication with each other, the diameter of the first through hole is greater than the diameter of the second through hole, the first through hole is arranged close to the light receiving assembly, a second filter plate is arranged in the first through hole, and a convex lens is arranged in the second through hole, and the circumferential side wall of the convex lens is attached to the inner wall of the second through hole.

[0017] By adopting the above technical scheme, the protection cover can provide installation positions for the second filter plate and the convex lens, and the circumferential side wall of the convex lens is attached to the inner wall of the second through hole, so that the convex lens can converge the light reflected by the first filter plate as much as possible, and the converged light is converted into parallel light and enters the second filter plate, and the second filter plate can filter out unnecessary wavelength light, so as to facilitate the light receiving assembly to receive.

[0018] Optionally, a mounting ring is arranged at the communication position of the first through hole and the second through hole, the convex lens and the second filter plate are respectively arranged on two sides of the mounting ring, and the second filter plate is arranged in spaced manner with the light receiving assembly.

[0019] By adopting the above technical scheme, the mounting ring is arranged, so that the distance between the second filter plate, the convex lens and the light receiving assembly is fixed, the intensity of the light signal that can be received by the light receiving assembly is ensured to a certain extent, the second filter plate is arranged in spaced manner with the light receiving assembly, so that the heat generated by the light receiving assembly during operation is not easily transmitted to the second filter plate, thereby facilitating the reduction of the possibility that the heat effect has an adverse effect on the second filter plate, and the light signal reflected by the light receiving assembly is not easily reflected back to the light receiving assembly by the second filter plate, so as to reduce the interference on the light receiving assembly.

[0020] Optionally, the protection cover includes a first sleeve and a second sleeve, the first sleeve is connected with the base and the second sleeve respectively, and the fiber ferrule is respectively inserted into the first sleeve and the second sleeve, and the connection positions of the first sleeve with the base, the first sleeve with the second sleeve and the fiber ferrule with the first sleeve are arranged in a stepped manner.

[0021] By adopting the above technical scheme, the connection positions of the base, the first sleeve, the second sleeve and the fiber ferrule are arranged in a stepped manner, so as to facilitate the improvement of the sealing performance of the single-fiber bidirectional optical module as a whole, so as to reduce the possibility that the external environment interferes with the transmission of light.

[0022] Optionally, two sides adjacent to the base are respectively provided with mounting seats, mounting grooves are formed in the mounting seats, the mounting grooves are communicated with the accommodating cavities, metal protective sleeves are coaxially arranged outside the light receiving assembly and the light emitting assembly respectively, and the light receiving assembly and the light emitting assembly are respectively inserted into the mounting grooves and connected with the mounting seats through the metal protective sleeves.

[0023] By adopting the above technical scheme, the metal protective sleeve is arranged, which reduces the risk of breakdown caused by excessively high electric field intensity to some extent, thereby facilitating reduction of the possibility of the light receiving assembly and the light emitting assembly being broken when coupled with the base.

[0024] Optionally, a cross section of the mounting groove is circular, a sliding groove is formed in the mounting seat around an axis of the mounting groove, the sliding groove is communicated with the mounting groove, a limiting piece is arranged on an outer wall of the metal protective sleeve, the metal protective sleeve is slidingly inserted into the mounting groove, and the limiting piece is slidingly inserted into the sliding groove and is clamped with an inner wall of the sliding groove.

[0025] By adopting the above technical scheme, the limiting block can be clamped with the inner wall of the sliding groove, so that the metal protective sleeve can be connected and fixed with the mounting seat through the limiting block, thereby facilitating mounting of the light receiving assembly and the light emitting assembly on the mounting seat respectively.

[0026] Optionally, the sliding groove comprises a first groove part and a second groove part which are communicated with each other, the first groove part and the second groove part are distributed around the axis of the mounting groove, a clamping piece is arranged in the second groove part, the limiting piece is slidingly inserted into the second groove part and abuts against the clamping piece, and an elastic sealing piece is filled between the limiting piece and the inner wall of the second groove part.

[0027] By adopting the above technical scheme, when the metal protective sleeve needs to be connected with the mounting seat, the metal protective sleeve is first inserted into the mounting groove, the limiting piece is inserted into the first groove part, and then the metal protective sleeve is rotated, so that the limiting piece is rotated and inserted into the second groove part and abuts against the clamping piece, thereby facilitating limiting of the limiting piece by the clamping piece to realize connection of the metal protective sleeve with the mounting seat, and the elastic sealing piece can apply a pressure force to the limiting piece, so that the limiting piece is not easy to move in the second groove part, thereby facilitating mounting of the light receiving assembly and the light emitting assembly on the mounting seat respectively.

[0028] In summary, the present application has at least one of the following beneficial technical effects:

[0029] 1. Through the cooperation of the light emitting assembly, the light receiving assembly, the first filter, the fiber ferrule and the protective kit, the light emitting assembly can emit corresponding wavelength light according to the needs of the product, thereby meeting the needs of different products for the intensity of wavelength light to a certain extent, and the wavelength light emitted by the light emitting assembly can pass through the first filter into the fiber ferrule, and the light signal emitted by the fiber ferrule can be reflected by the first filter to the light receiving assembly for being received by the light receiving assembly;

[0030] 2. Through the cooperation of the protective cover, the mounting ring, the second filter and the convex lens, the distance between the second filter, the convex lens and the light receiving assembly is fixed, the convex lens can converge the light signal reflected by the first filter to the light receiving assembly, and the converged light signal is transmitted to the second filter, so that the second filter filters out unnecessary wavelength light and reduces the loss of light signal, thereby ensuring the intensity and quality of the light signal received by the light receiving assembly to a certain extent, so as to facilitate the reception of the light receiving assembly;

[0031] 3. Through the cooperation of the mounting seat, the metal protective sleeve, the limiting piece, the clamping piece and the elastic sealing piece, on the one hand, the light receiving assembly and the light emitting assembly are facilitated to be installed, and on the other hand, the risk of breakdown caused by excessively high electric field strength is reduced to a certain extent, thereby facilitating to reduce the possibility of the light receiving assembly and the light emitting assembly being broken when they are coupled with the base. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a whole structure schematic diagram of a single-fiber bidirectional optical module for fiber radio frequency transmission of the embodiment 1 of the present application.

[0033] Figure 2 is a structure schematic diagram of another perspective of a single-fiber bidirectional optical module for fiber radio frequency transmission of the embodiment 1 of the present application.

[0034] Figure 3 is a partial structure sectional view along the line A-A in Figure 2

[0035] Figure 4 is an enlarged view of the part B in Figure 3

[0036] Figure 5 is a structure schematic diagram of a mounting seat of the embodiment 2 of the present application.

[0037] Figure 6 is a structure schematic diagram of a light receiving assembly and a metal protective sleeve of the embodiment 2 of the present application.

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] ​​1, base; 11, containing cavity; 12, first filter; 13, mounting seat; 131, mounting groove; 132, sliding groove; 1321, first groove part; 1322, second groove part; 133, clamping piece; 134, elastic sealing piece; 14, limiting groove; 15, isolator; 16, ramp clamping groove; 2, light emitting assembly; 21, first mirror surface; 3, light receiving assembly; 31, second mirror surface; 4, fiber assembly; 41, fiber ferrule; 42, protection sleeve; 421, first sleeve; 422, second sleeve; 43, SC / APC fiber; 5, metal protection sleeve; 51, limiting piece; 6, protection cover; 61, first through hole; 62, second through hole; 63, mounting ring; 7, second filter; 8, convex lens; 9, optical fiber. DETAILED DESCRIPTION

[0040] The application will be further described below in conjunction with the accompanying drawings. Figures 1-6 The application will be further described below in conjunction with the accompanying drawings.

[0041] The application discloses a single-fiber bidirectional optical module for optical fiber radio frequency transmission.

[0042] It should be noted that in the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0043] Embodiment 1

[0044] Referring to Figure 1 A single-fiber bidirectional optical module for optical fiber radio frequency transmission includes a base 1, a light emitting assembly 2, a light receiving assembly 3, and a fiber assembly 4. The light emitting assembly 2 and the light receiving assembly 3 are respectively arranged on the two sides adjacent to the base 1 and coupled with the base 1, and the fiber assembly 4 is arranged at one end of the base 1 away from the light emitting assembly 2 and coaxially arranged with the light emitting assembly 2.

[0045] Referring to Figure 2 and Figure 3 A containing cavity 11 is formed in the base 1, and a first filter 12 is arranged obliquely in the containing cavity 11. The first filter 12 is located between the fiber assembly 4, the light emitting assembly 2 and the light receiving assembly 3, so that the wavelength light emitted by the light emitting assembly 2 can be incident to the fiber assembly 4 through the first filter 12, and part of the optical signal is reflected from the fiber assembly 4 to the first filter 12, so as to be reflected to the light receiving assembly 3 by the first filter 12.

[0046] With reference to Figure 3 , two adjacent sides of the base 1 are respectively fixedly connected with mounting seats 13, mounting grooves 131 are formed in the mounting seats 13, and the mounting grooves 131 are communicated with the accommodating cavity 11. The light receiving assembly 3 and the light emitting assembly 2 are respectively inserted into the mounting grooves 131, and coaxial metal protective sleeves 5 are respectively arranged on the circumferential side walls of the light receiving assembly 3 and the light emitting assembly 2, and the metal protective sleeves 5 are connected to the inner walls of the mounting grooves 131, so as to facilitate the fixation of the light receiving assembly 3 and the light emitting assembly 2 in the mounting grooves 131.

[0047] The arrangement of the metal protective sleeves 5 reduces the risk of breakdown caused by excessively high electric field intensity, thereby facilitating the reduction of the possibility of breakdown of the light receiving assembly 3 and the light emitting assembly 2 when coupled with the base 1.

[0048] With reference to Figure 1 , the light emitting assembly 2 includes a 4PIN emitting end composed of four pins, and the four pins are respectively CASE, LD-, PD+, and LD+ / PD-. The light emitting assembly 2 can emit eight different wavelengths of light, and the eight different wavelengths of light are respectively 1GCWDM 1371nm, 1391nm, 1411nm, 1431nm, 1451nm, 1471nm, 1511nm, and 1611nm. In this embodiment, the light emitting assembly 2 is a semiconductor laser, and when different products have different demands for wavelengths of light, the chip in the light emitting assembly 2 can be replaced to make the light emitting assembly 2 emit light of a corresponding wavelength.

[0049] With reference to Figure 3 , a limiting groove 14 is formed in the base 1 near one end of the light emitting assembly 2, the limiting groove 14 is communicated with the accommodating cavity 11 and coaxially arranged. An isolator 15 is inserted into the limiting groove 14, the isolator 15 can make the light signal emitted by the light emitting assembly 2 unidirectionally propagate to the first filter 12, and reduce the possibility of reverse propagation of the light signal to the light emitting assembly 2. The limiting groove 14 can limit the isolator 15, so as to facilitate the installation of the isolator 15 in the limiting groove 14, and fix the spacing between the isolator 15 and the first filter 12.

[0050] One end of the light emitting assembly 2 near the base 1 is provided with a first mirror surface 21 with a lens, the first mirror surface 21 can converge the wavelength light emitted by the light emitting assembly 2, so as to facilitate the wavelength light to pass through the isolator 15 and be incident to the first filter 12.

[0051] With reference to Figure 1 and Figure 3 , a slope clamping groove 16 is formed in the inner wall of the accommodating cavity 11, and the slope clamping groove 16 is located between the limiting groove 14 and the pigtail assembly 4. The first filter 12 is inserted into the slope clamping groove 16 and abuts against the inner wall of the slope clamping groove 16.

[0052] In the embodiment, the first filter 12 is a 45-degree filter, and the first filter 12 is fixed on the inner wall of the slope slot 16 in a manner of adhesion, so that the inner wall of the slope slot 16 can stably support the first filter 12, thereby reducing the possibility of shaking of the first filter 12, and further facilitating fixation of the position of the first filter 12.

[0053] In the embodiment, the first filter 12 is divided into two types, one of which retains 1270-1519 nm wavelength light and reflects 1550 nm wavelength light, and the other of which retains 1610 nm wavelength light and reflects 1550 nm wavelength light. Which type of first filter 12 is used is determined according to the wavelength light emitted by the light emitting assembly 2.

[0054] With reference to Figure 3 The light receiving assembly 3 includes a 3PIN receiving end composed of three pins, and the three pins are CASE, PD+, and PD-. In the embodiment, the light receiving assembly 3 only receives 1550 nm wavelength light, and the light receiving assembly 3 is provided with a second mirror surface 31 with a lens at one end close to the base 1.

[0055] With reference to Figure 3 and Figure 4 The light receiving assembly 3 is coaxially provided with a protective cover 6 at one end close to the base 1, the protective cover 6 is inserted into the accommodating cavity 11, the protective cover 6 is provided with a first through hole 61 and a second through hole 62 along the axis direction thereof, the first through hole 61 and the second through hole 62 are in communication with each other, the diameter of the first through hole 61 is greater than that of the second through hole 62, the first through hole 61 is close to the light receiving assembly 3, and the second mirror surface 31 is inserted into the first through hole 61.

[0056] The first through hole 61 is provided with a second filter 7, and the second through hole 62 is provided with a convex lens 8, and the circumferential side wall of the convex lens 8 is attached to the inner wall of the second through hole 62, so that the light reflected by the first filter 12 to the convex lens 8 can be as much as possible converged by the convex lens 8, and the convex lens 8 can convert the converged light into parallel light and then incident on the second filter 7.

[0057] In the embodiment, the second filter 7 is a 0-degree filter, which is used to filter out the wavelength light that is not needed by the light receiving assembly 3, thereby facilitating avoidance of the phenomenon of receiving error when the optical signal is transmitted to the light receiving assembly 3.

[0058] With reference to Figure 4The mounting ring 63 is coaxially and fixedly connected at the communication position of the first through hole 61 and the second through hole 62, and the convex lens 8 and the second filter 7 are fixedly connected with the mounting ring 63, so that the mounting ring 63 can support the convex lens 8 and the second filter 7, and the distance between the second filter 7 and the convex lens 8 and the light receiving assembly 3 is fixed. In the embodiment, the second filter 7 is fixed on the mounting ring 63 by means of gluing.

[0059] At this time, the second filter 7 and the second mirror 31 are arranged at a distance from each other, so that the heat generated by the light receiving assembly 3 during operation is not easily transmitted to the second filter 7, thereby reducing the possibility of adverse effects of heat on the second filter 7.

[0060] Referring to Figure 2 and Figure 3 , the pigtail assembly 4 comprises a fiber ferrule 41 and a protection sleeve 42 arranged on one side of the circumference of the fiber ferrule 41. The protection sleeve 42 is connected with the base 1, and one end of the fiber ferrule 41 is inserted into the accommodating cavity 11 and coaxially arranged with the light emitting assembly 2. In the embodiment, the fiber ferrule 41 is a ceramic ferrule.

[0061] Referring to Figure 3 , the protection sleeve 42 comprises a first sleeve 421 and a second sleeve 422. One end of the first sleeve 421 is connected with the base 1, the other end of the first sleeve 421 is inserted into the second sleeve 422 and is threadedly connected with the second sleeve 422, and the first sleeve 421 and the second sleeve 422 are sleeved on the fiber ferrule 41.

[0062] In the embodiment, the connection position of the first sleeve 421 and the base 1, the connection position of the first sleeve 421 and the second sleeve 422, and the connection position of the fiber ferrule 41 and the first sleeve 421 are arranged in a stepped manner, so as to on the one hand, limit the fiber ferrule 41 by means of the first sleeve 421 and the second sleeve 422, and fix the distance between the end face of the fiber ferrule 41 and the first filter 12, and on the other hand, improve the sealing performance of the single-fiber bidirectional optical module as a whole, so as to reduce the possibility of external environment interfering with the transmission of light.

[0063] Referring to Figure 1 , the pigtail assembly 4 further comprises an SC / APC pigtail 43, the SC / APC pigtail 43 is used to be connected with an external device, and an optical fiber 9 is connected between the SC / APC pigtail 43 and the fiber ferrule 41, so as to realize the transmission of optical signals.

[0064] The implementation principle of the single-fiber bidirectional optical module for optical fiber radio frequency transmission according to the embodiment of the application is as follows: when it is needed to transmit an optical signal, the optical transmitting assembly 2 transmits an optical signal with a specific wavelength, the transmitted optical signal sequentially passes through the first mirror surface 21, the isolator 15 and the first filter 12, is incident on the optical fiber ferrule 41, and enters an external device through the optical fiber 9 and the SC / APC pigtail 43, thereby completing external transmission of the optical signal.

[0065] Meanwhile, the optical signal transmitted by the external device enters from the SC / APC pigtail 43, is incident on the accommodation cavity 11 through the optical fiber ferrule 41, and is reflected by the first filter 12 in the accommodation cavity 11 to the convex lens 8. The convex lens 8 converts the converging optical signal into parallel light and is incident on the second filter 7. The second filter 7 filters the wavelength light that is not needed in the optical signal. The filtered optical signal enters the second mirror surface 31, so that the optical receiving assembly 3 receives the optical signal.

[0066] Embodiment 2

[0067] The difference between the embodiment 2 and the embodiment 1 is that the metal protective sleeve 5 is detachably connected with the mounting seat 13.

[0068] Referring to Figure 5 In the embodiment, the cross section of the mounting groove 131 is circular. The mounting seat 13 is provided with a sliding groove 132 around the axis of the mounting groove 131. In the embodiment, the sliding groove 132 is provided with two sliding grooves 132, which are uniformly distributed and respectively communicate with the mounting groove 131.

[0069] The sliding groove 132 includes a first groove part 1321 and a second groove part 1322 which are in communication with each other. The first groove part 1321 and the second groove part 1322 are distributed around the axis of the mounting groove 131. The inner wall of the second groove part 1322 is fixedly connected with a clamping piece 133. The clamping piece 133 is located at the end of the second groove part 1322 away from the base 1.

[0070] Referring to Figure 5 and Figure 6 The metal protective sleeve 5 is adapted to the shape design of the mounting groove 131. The circumferential outer wall of the metal protective sleeve 5 is fixedly connected with a limiting piece 51. The number of the limiting pieces 51 is equal to the number of the sliding grooves 132 and is arranged in one-to-one correspondence with the sliding grooves 132.

[0071] When it is needed to fix the metal protective sleeve 5 and the mounting base 13, first, the metal protective sleeve 5 is inserted into the mounting groove 131, and the limiting piece 51 is inserted into the first groove part 1321, then the metal protective sleeve 5 is rotated, the metal protective sleeve 5 drives the limiting piece 51 to move, and the limiting piece 51 is inserted into the second groove part 1322. At this time, the limiting piece 51 is in contact with the side of the clamping piece 133 close to the base 1, so that the limiting piece 51 is limited by the clamping piece 133, the metal protective sleeve 5 is not easy to be separated from the mounting groove 131, and then the light receiving assembly 3 and the light emitting assembly 2 are conveniently mounted in the mounting groove 131 through the metal protective sleeve 5.

[0072] The limiting piece 51 and the inner wall of the second groove part 1322 are filled with the elastic sealing piece 134, in the embodiment, the elastic sealing piece 134 is a rubber gasket, so that the elastic sealing piece 134 can exert force on the limiting piece 51, and form certain friction and fixing force, to reduce the possibility of the limiting piece 51 moving in the second groove part 1322, and further improve the connection stability of the light receiving assembly 3 and the light emitting assembly 2 and the mounting base 13.

[0073] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A single fiber bidirectional optical module for radio over fiber transmission, characterized by: Including base (1), light emitting assembly (2) and light receiving assembly (3), the light emitting assembly (2), the light receiving assembly (3) are installed respectively on the two sides adjacent to the base (1), the light emitting assembly (2) is used to emit multiple different wavelength light, the base (1) is internally provided with containing cavity (11), the containing cavity (11) is provided with first filter (12) inside obliquely; The tail fiber assembly (4) is arranged at the end of the base (1) away from the light emitting assembly (2), the tail fiber assembly (4) includes fiber ferrule (41) and protective sleeve (42) arranged on the circumferential side of the fiber ferrule (41), the protective sleeve (42) is connected with the base (1), one end of the fiber ferrule (41) is inserted into the containing cavity (11) and is coaxially arranged with the light emitting assembly (2), the first filter (12) is located between the fiber ferrule (41), the light emitting assembly (2) and the light receiving assembly (3); The wavelength light emitted by the light emitting assembly (2) is incident to the fiber ferrule (41) through the first filter (12), part of the light signal is reflected to the first filter (12) through one end of the fiber ferrule (41), and is reflected to the light receiving assembly (3) through the first filter (12). The inner wall of the containing cavity (11) is provided with a limiting groove (14), the limiting groove (14) is located on the side of the first filter (12) close to the light emitting assembly (2), and the isolator (15) is arranged in the limiting groove (14). The light receiving assembly (3) is coaxially provided with a protective cover (6) at one end close to the first filter (12), the protective cover (6) is provided with a first through hole (61) and a second through hole (62) along the axis direction thereof, the first through hole (61) and the second through hole (62) are in communication with each other, the diameter of the first through hole (61) is greater than that of the second through hole (62) and is arranged close to the light receiving assembly (3), the second filter (7) is arranged in the first through hole (61), the convex lens (8) is arranged in the second through hole (62), and the circumferential side wall of the convex lens (8) is attached to the inner wall of the second through hole (62). The base (1) is provided with a mounting seat (13) on the two adjacent sides, the mounting seat (13) is provided with a mounting groove (131), the mounting groove (131) is in communication with the containing cavity (11), the light receiving assembly (3) and the light emitting assembly (2) are respectively coaxially provided with a metal protective sleeve (5), and the light receiving assembly (3) and the light emitting assembly (2) are respectively inserted into the mounting groove (131) and connected with the mounting seat (13) through the metal protective sleeve (5).

2. The single-fiber bidirectional optical module for radio-over-fiber transmission according to claim 1, characterized in that: The light emitting assembly (2) is used to emit eight different wavelengths of light, and the eight different wavelengths of light are 1G CWDM 1371nm, 1391nm, 1411nm, 1431nm, 1451nm, 1471nm, 1511nm and 1611nm.

3. The single fiber bidirectional optical module for radio over fiber transmission of claim 1, wherein: The inner wall of the accommodating cavity (11) is provided with a slope clamping groove (16), and the first filter piece (12) is inserted into the slope clamping groove (16).

4. The single fiber bidirectional optical module for radio over fiber transmission of claim 1, wherein: The first through hole (61) and the second through hole (62) are provided with a mounting ring (63), the convex lens (8) and the second filter piece (7) are respectively mounted on both sides of the mounting ring (63), and the second filter piece (7) and the light receiving assembly (3) are arranged at intervals.

5. The single fiber bidirectional optical module for radio over fiber transmission of claim 1, wherein: The protection kit (42) comprises a first sleeve (421) and a second sleeve (422), the first sleeve (421) is connected with the base (1) and the second sleeve (422) respectively, the fiber ferrule (41) is inserted into the first sleeve (421) and the second sleeve (422) respectively, the connection between the first sleeve (421) and the base (1), the connection between the first sleeve (421) and the second sleeve (422), and the connection between the fiber ferrule (41) and the first sleeve (421) are all arranged in a stepped manner.

6. The single fiber bidirectional optical module for radio over fiber transmission of claim 1, wherein: The cross section of the mounting groove (131) is circular, the sliding groove (132) is arranged around the axis of the mounting groove (131) in the mounting seat (13), the sliding groove (132) is communicated with the mounting groove (131), the outer wall of the metal protective sleeve (5) is provided with a limiting piece (51), the metal protective sleeve (5) is slidingly inserted into the mounting groove (131), and the limiting piece (51) is slidingly inserted into the sliding groove (132) and is clamped with the inner wall of the sliding groove (132).

7. The single fiber bidirectional optical module for radio over fiber transmission according to claim 6, characterized in that: The sliding groove (132) comprises a first groove part (1321) and a second groove part (1322) which are communicated with each other, the first groove part (1321) and the second groove part (1322) are distributed around the axis of the mounting groove (131), the second groove part (1322) is provided with a clamping piece (133), the limiting piece (51) is slidingly inserted into the second groove part (1322) and abuts against the clamping piece (133), and the limiting piece (51) and the inner wall of the second groove part (1322) are filled with an elastic sealing piece (134).

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