A combo pon optical device

Abstract

This invention belongs to the field of optical communication technology, specifically providing a COMBO PON optical device, including a transmitter assembly and a housing with a mirror cavity; the housing has an optical port, an optical transmitting port, and multiple optical receiving ports; the mirror cavity contains a beam splitter for splitting the incident combined light entering through the optical port; the transmitter assembly includes a PBS assembly and multiple lasers; the PBS assembly is located on the output optical path of the lasers; the beam splitter and the optical port are sequentially arranged on the output optical path of the PBS assembly. The use of a PBS in the transmitter structure reduces other passive components, ensures maximum coupling efficiency and beam quality, and requires less space. The optical path is designed as parallel light, lengthening the optical path while improving the coupling efficiency between the laser and the detector. The overall structure of this optical device, while ensuring that the optical path and beam size are not affected and the structure is reliable, improves coupling efficiency through optical simulation.

Description

Technical Field

[0001] This utility model belongs to the field of optical communication technology, specifically relating to a COMBO PON optical device. Background Technology

[0002] 10G COMBO is a fusion of multiple generations of PON technology by integrating GPON and 10G PON optical modules into the same OLT board. COMBO PON does not require additional cabinets or external multiplexers and can directly reuse existing cost fiber distribution networks (ODNs), significantly reducing upgrade costs. Therefore, the development of Combo-PON technology has attracted widespread attention from industry professionals.

[0003] Existing COMBO PON optoelectronic devices generally suffer from technical problems such as complex structure and low coupling efficiency in their transmission and reception channels. Therefore, there is a need to provide a technical solution that integrates multiple generations of PON technology. Utility Model Content

[0004] The purpose of this invention is to overcome the problems of complex structure and low coupling efficiency in existing COMBO PON technology.

[0005] To address this, the present invention provides a COMBO PON optical device, comprising a transmitter assembly and a housing with a mirror cavity; the housing has an optical port, an optical emission port, and multiple optical reception ports; the mirror cavity is provided with a beam splitter for splitting the incident combined light entering through the optical port; the transmitter assembly includes a PBS assembly and multiple lasers; the PBS assembly is located in the output optical path of the lasers; the beam splitter and the optical port are sequentially arranged in the output optical path of the PBS assembly.

[0006] Specifically, the aforementioned COMBO PON optical device also includes an optical fiber adapter; the ferrule of the optical fiber adapter is coupled and fixed at the optical port end; the coupling end face angle of the ferrule is 4°.

[0007] Specifically, the coupling end face of the aforementioned pin is coated with an anti-reflection film.

[0008] Specifically, the aforementioned transmitter assembly also includes a transmitter housing; the PBS assembly and the plurality of lasers are mounted within the transmitter housing.

[0009] Specifically, the transmitter housing is provided with a cover plate mating hole for accommodating the laser and PBS assembly; a sealing cover plate is provided at the cover plate mating hole.

[0010] Specifically, the aforementioned transmitter assembly also includes multiple collimating lenses that correspond one-to-one with the laser; the collimating lenses are positioned between the laser and the PBS assembly and are located in the laser's output light path.

[0011] Specifically, an isolator is provided in the optical path from the PBS component to the beam splitter.

[0012] Specifically, a converging lens is provided between the aforementioned beam splitter and the optical port.

[0013] Specifically, the aforementioned housing has two optical receiving ports; the beam splitting assembly includes a first filter, a second filter, and a third filter; the first filter is located on the incident light path of the optical emitting port; the second filter is located on the transmitted light path of the first filter; the third filter is located on the reflected light path of the second filter; the optical port is located on the transmitted light path of the second filter; and the two optical receiving ports are respectively located on the reflected light paths of the first filter and the third filter.

[0014] Specifically, the aforementioned COMBO PON optical device also includes multiple detectors; each detector is connected to each optical receiving port in a corresponding manner.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] The transmitter structure of this COMBO PON optical device adopts a PBS (Polydioxanone) design. Compared with the 45° diaphragm used in traditional solutions, it reduces other passive components and has lower losses. The optical port pin can receive more light from the laser, ensuring maximum coupling efficiency and beam quality, while requiring less space. The beam combiner is integrated outside the housing, and the optical path is designed as a parallel beam, which lengthens the optical path and improves the coupling efficiency between the laser and the detector. The hollowed-out design on both sides of the housing facilitates the bonding and assembly of the beam splitter components and prevents glue overflow from affecting product performance. The overall structure of this optical device improves coupling efficiency through optical simulation while ensuring that the optical path and beam size are not affected and the structure is reliable. In addition, the pin uses a 4° coupling end face with a coating to reduce optical crosstalk.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the COMBO PON optical device structure in one implementation method.

[0019] Figure 2 This is a schematic diagram of the sealing cover structure in one implementation method.

[0020] Figure 3 This is a schematic diagram of the internal optical path of a COMBO PON optical device in one implementation method.

[0021] Figure 4 This is a schematic diagram of the laser emission optical path in one implementation method.

[0022] Figure 5 This is a schematic diagram of the first receiving optical path in one implementation method.

[0023] Figure 6 This is a schematic diagram of the second receiving optical path in one implementation method.

[0024] Explanation of reference numerals in the attached drawings: 1. Transmitter housing; 2. First laser; 3. First collimating lens; 4. Second laser; 5. Second collimating lens; 6. PBS assembly; 7. Optical window; 8. Sealing cover; 9. Housing; 10. Isolator; 11. First filter; 12. Second filter; 13. Third filter; 14. Fourth filter; 15. Fifth filter; 16. Converging lens; 17. Pin; 18. Fiber optic adapter; 19. Adjustment ring; 20. First detector; 21. Second detector. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] Reference Figure 1-3This invention provides a COMBO PON optical device, including a transmitter assembly and a housing 9 with a mirror cavity. The housing 9 has an optical port, an optical transmitting port, and multiple optical receiving ports. The mirror cavity contains a beam splitter for splitting the incident combined light entering through the optical port. The transmitter assembly includes a PBS assembly 6 and multiple lasers. The PBS assembly 6 is located in the output optical path of the lasers. The beam splitter and the optical port are sequentially arranged in the output optical path of the PBS assembly 6. The output light from each laser passes through the PBS assembly 6, and then sequentially through the beam splitter and the optical port to enter the fiber optic adapter 18. The incident combined light entering through the optical port is split by the beam splitter and then sequentially reflected to the corresponding optical receiving port.

[0029] The PBS assembly includes a polarizing beam splitter PBS, the number of which is designed according to actual needs, so that the emitted light from each laser can enter the housing 9 through the PBS assembly 6. Compared with the 45° diaphragm used in traditional solutions, the PBS design reduces other passive components and has lower losses. The ferrule 17 can receive more light from the laser end, ensuring maximum coupling efficiency and beam quality, while requiring less space.

[0030] Furthermore, the COMBO PON optical device also includes a fiber optic adapter 18; the ferrule 17 of the fiber optic adapter 18 is coupled and fixed to the optical port end; the coupling end face angle of the ferrule 17 is 4°. Preferably, an anti-reflection coating is deposited on the coupling end face of the ferrule 17 to prevent optical path reflection and reduce the degree of optical crosstalk from the transmitter to the receiver. To achieve device miniaturization design, the length of the ferrule 17 is designed to be close to the limit while ensuring the optical port protocol standard, while also ensuring the reliability of the ferrule 17 and laser welding.

[0031] Optionally, the fiber optic adapter 18 is installed on the optical port of the housing 9 via an adjustment ring 19. The adjustment ring 19 is used to adjust the structure optical path matching to ensure the stability of the optical device.

[0032] In a more detailed embodiment, the transmitter assembly further includes a transmitter housing 1; the PBS assembly 6 and the plurality of lasers are mounted inside the transmitter housing 1; the transmitter housing 1 is connected to the optical receiving port. Preferably, the transmitter housing 1 is provided with an optical window 7; the optical window 7 is located in the optical path emitted by the PBS assembly 6.

[0033] To facilitate the assembly of the transmitter components, the transmitter housing 1 is provided with a cover plate mating hole for the installation of the laser and PBS component 6; a sealing cover plate 8 is provided at the cover plate mating hole to prevent external impurities from entering the transmitter housing 1 and affecting the optical path of the device, thus ensuring the stability of the optical device.

[0034] Furthermore, the transmitter assembly is also equipped with multiple collimating lenses that correspond one-to-one with the laser. The collimating lenses are disposed between the laser and the PBS assembly 6 and are located in the laser's output light path. The collimating lenses convert the output beam of the corresponding laser into parallel light output, which facilitates optical path transmission and reduces energy loss.

[0035] Preferably, an isolator 10 is provided in the optical path from the PBS component 6 to the beam splitter to enable unidirectional transmission of light entering the emission port, prevent light from being reflected back to the laser, interfere with its stability, and ensure the transmission quality of the optical signal.

[0036] In an optimized embodiment, a converging lens 16 is provided between the beam splitter and the optical port, ensuring that the system light is parallel in the beam splitter section, facilitating multi-wavelength optical path splitting and meeting performance requirements. Simultaneously, the converging lens 16 is housed within the housing 9, separate from the ferrule 17, better guaranteeing coupling efficiency. Furthermore, to ensure low crosstalk at the receiving end, the converging lens 16 is an angled lens, preferably a 6° angled lens.

[0037] In a detailed embodiment, the housing 9 has two optical receiving ports; the beam splitter includes a first filter 11, a second filter 12, and a third filter 13; the first filter 11 is located on the incident optical path of the optical emitting port; the second filter 12 is located on the transmitted optical path of the first filter 11; the third filter 13 is located on the reflected optical path of the second filter 12; the fiber optic adapter 18 is located on the transmitted optical path of the second filter 12; the two optical receiving ports are respectively located on the reflected optical paths of the first filter 11 and the third filter 13. Light entering the optical emitting port is transmitted through the first filter 11 and the second filter 12 and then output from the optical port; the incident combined light entering the optical port is reflected / transmitted by each filter to the corresponding optical receiving port by the corresponding wavelength. Preferably, the first filter 11 is a 45° filter, the second filter 12 is a 13° filter, and the third filter 13 is a 32° filter.

[0038] Specifically, the COMBO PON optical device also includes multiple detectors; each detector is connected to a corresponding optical receiving port. The optical receiving port may also be equipped with a 0° filter to ensure that the detector receives light of the corresponding wavelength while blocking light of other wavelengths.

[0039] The preferred angle tolerance for the housing 9, sealing cover 8, and adjusting ring 19 is ±0.5°, and the dimensional tolerance is ±0.04mm. Local areas are treated with root cleaning, deburring, and flatness treatment to facilitate welding and bonding of passive components and to better adapt to the module structure.

[0040] Example 1:

[0041] This embodiment provides a COMBO PON optical device, including a transmitter assembly, a first detector 20, a second detector 21, an optical fiber adapter 18, and a housing 9 with a mirror cavity;

[0042] The housing 9 has an optical port, an optical emission port, a first optical receiving port, and a first optical receiving port; a beam splitting assembly is provided inside the mirror cavity; the beam splitting assembly includes a first filter 11, a second filter 12, and a third filter 13; the first filter 11 is located on the incident light path of the optical emission port; the second filter 12 is located on the transmitted light path of the first filter 11; the third filter 13 is located on the reflected light path of the second filter 12; the optical port is located on the transmitted light path of the second filter 12; and the first optical receiving port is located on the reflected light path of the first filter 11. The second optical receiving port is located on the reflected light path of the third filter 13; a converging lens 16 is provided between the second filter 12 and the optical port; the converging lens 16 is located on the transmitted light path of the second filter 12; an isolator 10 is provided at the optical transmitting port; a fourth filter 14 is provided at the first optical receiving port; a fifth filter 15 is provided at the second optical receiving port; the first filter 11 is a 45° filter, the second filter 12 is a 13° filter, the third filter 13 is a 32° filter, and the fourth filter 14 and the fifth filter 15 are both 0° filters;

[0043] The transmitter assembly includes a transmitter housing 1, a PBS, a first laser 2, a second laser 4, a first collimating lens 3, and a second collimating lens 5. The transmitter housing 1 is provided with a cover plate mating hole and an optical window 7. The PBS, the first laser 2, the second laser 4, the first collimating lens 3, and the second collimating lens 5 are installed inside the transmitter housing 1 through the cover plate mating hole. A sealing cover plate 8 is provided at the cover plate mating hole. The first collimating lens 3 and the second collimating lens 5 are respectively located on the output optical paths of the first laser 2 and the second laser 4. The PBS is located on the output optical paths of the first collimating lens 3 and the second collimating lens 5. The transmitter housing 1 is connected to the optical emission port of the housing 9. The optical window 7, the isolator 10, the first filter 11, the second filter 12, the converging lens 16, and the optical port are sequentially arranged on the output optical path of the PBS assembly 6.

[0044] The ferrule 17 of the fiber optic adapter 18 is coupled and fixed to the optical port end; the coupling end face angle of the ferrule 17 is 4°, and the coupling end face is coated with an anti-reflection film;

[0045] The first detector 20 and the second detector 21 are respectively connected to the first optical receiving port and the second optical receiving port.

[0046] The above-mentioned COMBO PON optical device is assembled using the following steps:

[0047] Step 1: Sequentially attach isolator 10, first filter 11, second filter 12, third filter 13, fourth filter 14, fifth filter 15, and converging lens 16 into the mirror cavity of housing 9.

[0048] Step 2: The first laser 2, the second laser 4, the first collimating lens 3, the second collimating lens 5, and the PBS are coupled and installed inside the transmitter housing 1 through the cover plate mating holes, and the parallel sealing cover plate 8 is assembled into XMD TO.

[0049] Step 3: Couple the transmitter housing 1, housing 9, and the ferrule 17 of the fiber optic adapter 18 into a three-piece configuration. Install the transmitter housing 1 on the optical transmission port and the fiber optic adapter 18 on the optical port. Couple the first detector 20 and the second detector 21 to the first optical receiving port and the second optical receiving port, respectively.

[0050] The laser emitter and housing 9, pin 17 and housing 9 are all fixed by laser welding to ensure the shear force and reliability of the product.

[0051] like Figure 4 As shown, the light emitted by the first laser 2 or the second laser 4 is collimated by the first collimating lens 3 or the second collimating lens 5, and then passes through the PBS, isolator 10, first filter 11, and second filter 12 in sequence. Finally, the converging lens 16 converts the parallel light into a converged light, which is then output from the optical port.

[0052] like Figure 5 As shown, the light entering from the optical port is converted into parallel light by the converging lens 16, and after being reflected by the second filter 12 and the third filter 13 in sequence, it is received by the second detector 21 after passing through the fifth filter 15.

[0053] like Figure 6 As shown, the light entering from the optical port is converted into parallel light by the converging lens 16, and then transmitted through the second filter 12, reflected by the first filter 11, and received by the first detector 20 after passing through the fourth filter 14.

[0054] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. A COMBO PON optical device, characterized in that: The device includes a transmitter assembly and a housing (9) with a mirror cavity; the housing (9) has an optical port, an optical emission port and multiple optical receiving ports; the mirror cavity is provided with a beam splitting component for splitting the incident combined light entering through the optical port; the transmitter assembly includes a PBS assembly (6) and multiple lasers; the PBS assembly (6) is located on the output optical path of the lasers; the beam splitting component and the optical port are sequentially arranged on the output optical path of the PBS assembly (6).

2. The COMBO PON optical device as described in claim 1, characterized in that: It also includes an optical fiber adapter (18); the pin (17) of the optical fiber adapter (18) is coupled and fixed to the optical port end; the coupling end face angle of the pin (17) is 4°.

3. The COMBO PON optical device as described in claim 2, characterized in that: The coupling end face of the pin (17) is coated with an anti-reflection film.

4. The COMBO PON optical device as described in claim 1, characterized in that: The transmitter assembly also includes a transmitter housing (1); the PBS assembly (6) and a plurality of the lasers are mounted inside the transmitter housing (1).

5. The COMBO PON optical device as described in claim 4, characterized in that: The transmitter housing (1) is provided with a cover plate mating hole for making way for the installation of the laser and PBS assembly (6); a sealing cover plate (8) is provided at the cover plate mating hole.

6. The COMBO PON optical device as described in claim 1, characterized in that: The transmitter assembly is also provided with a plurality of collimating lenses corresponding one-to-one with the laser; the collimating lenses are disposed between the laser and the PBS assembly (6) and are located in the output light path of the laser.

7. The COMBO PON optical device as described in claim 1, characterized in that: An isolator (10) is provided on the optical path from the PBS component (6) to the beam splitter.

8. The COMBO PON optical device as described in claim 1, characterized in that: A converging lens (16) is provided between the beam splitter and the optical port.

9. The COMBO PON optical device as described in claim 1, characterized in that: The housing (9) has two optical receiving ports; the beam splitting assembly includes a first filter (11), a second filter (12) and a third filter (13); the first filter (11) is located on the incident light path of the optical emission port; the second filter (12) is located on the transmitted light path of the first filter (11); the third filter (13) is located on the reflected light path of the second filter (12); the optical port is located on the transmitted light path of the second filter (12); the two optical receiving ports are respectively located on the reflected light paths of the first filter (11) and the third filter (13).

10. The COMBO PON optical device as described in claim 1, characterized in that: It also includes multiple detectors; each detector is connected to each optical receiving port in a one-to-one correspondence.

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