BOX and coaxial TO hybrid packaged single-fiber three-transmitting and three-receiving optical device

Abstract

The utility model discloses a BOX and coaxial TO hybrid packaged single-fiber three-transmitting and three-receiving optical device, which comprises a wave separator, an optical combination assembly is arranged behind the wave separator, an optical fiber adapter is arranged in front of the wave separator, and the optical combination assembly, the wave separator and the optical fiber adapter are positioned on the same straight line optical path; the wave separator comprises three filters, namely a first filter, a second filter and a third filter, which are arranged at intervals along the direction of a linear light path, and the three filters are obliquely arranged at any angle of 8-45 degrees; light emitted from the optical fiber adapter is sequentially reflected by three filters in the wave separator to be divided into three paths of collimated light beams, and the three paths of collimated light beams are perpendicular to a linear light path and are emitted to each receiving detector; through the structural form of wave plate combination, the cost is reduced, the port integration density is improved, three-transmitting and three-receiving of the coaxial single fiber is realized, the product reliability is effectively improved, the product reliability is ensured, and the optimal performance and cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication, in particular to a single-fiber three-transmitter and three-receiver optical device with a BOX and coaxial TO hybrid package. Background Art

[0002] 50G PON deployment requires compatibility with the three generations of PON (GPON, 10G PON, and 50G PON) in terms of tri-mode transmission. This means simultaneously meeting the transmission requirements of three different wavelengths for both upstream and downstream transmission. Existing traditional PON optical devices offer limited transmission channels, including single-fiber one transmitter and two receivers, single-fiber two transmitters and one receiver, or single-fiber two transmitters and two receivers. These cannot meet the tri-mode transmission requirements of 50G PON. Therefore, a single-fiber three-transmitter, three-receiver optical device is needed to meet these transmission requirements.

[0003] Furthermore, market demands demand a certain level of cost-effectiveness in optoelectronic products. While some existing optical components with three transmitters and three receivers are integrated, these are few and far between. These components are not only complex and expensive to manufacture, but also have low port density, hindering market adoption. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a single-fiber three-transmitter and three-receiver optical device with a rational structure and a hybrid package of BOX and coaxial TO, thereby taking into account both cost reduction and improvement of port integration density, realizing coaxial single-fiber three-transmitter and three-receiver, and effectively improving and ensuring product reliability, achieving the optimal performance and cost.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A single-fiber three-transmitter, three-receiver device with a hybrid BOX and coaxial TO package includes a wave splitter, a light-combining component arranged behind the wave splitter, and a fiber optic adapter arranged in front of the wave splitter. The light-combining component, wave splitter, and fiber optic adapter are located on the same straight optical path. The wave splitter includes three filters arranged at intervals along the straight optical path, namely a first filter, a second filter, and a third filter. The three filters are arranged at an angle of 8-45°. Light emitted from the fiber optic adapter is reflected by the three filters in the wave splitter in sequence and split into three collimated light beams. The three collimated light beams are emitted perpendicular to the straight optical path to each receiving detector.

[0007] As a further improvement of the above technical solution:

[0008] The tilt angles of the three filters are one, two or three of 8°, 13° and 45° respectively.

[0009] The filter has an inclination angle of 8°, which is used in application scenarios with a wavelength interval of less than 20nm; the filter has an inclination angle of 13°, which is used in application scenarios with a wavelength interval of 20-50nm; and the filter has an inclination angle of 45°, which is used in application scenarios with a wavelength interval of more than 50nm.

[0010] When the inclination angle of the filter is less than 45°, the collimated light beam reflected by the filter is tilted back relative to the straight light path and emitted to the wave plate. The wave plate is located outside the straight light path. After being reflected by the wave plate, the collimated light beam is emitted to the receiving detector in a direction perpendicular to the straight light path.

[0011] When the inclination angle of the filter is 45°, the collimated light beam reflected by the filter is emitted to the receiving detector in a direction perpendicular to the straight light path.

[0012] It also includes a BOX shell, and the light-combining component is located in the BOX shell. Three groups of emitting lasers are orderly arranged and encapsulated in the BOX shell on one side of the light-combining component. The light emitted by the three groups of emitting lasers is combined into a collimated light beam through the light-combining component. A window for the collimated light beam to be emitted is opened on the BOX shell.

[0013] A lens 1 is arranged between each single emitting laser and the light combining component, and an isolator is arranged between the light outlet of the light combining component and the BOX shell window; the light combining component is a PBS light component or a Z-Block light component.

[0014] The wave splitter is housed in a metal housing, and the BOX housing and the optical fiber adapter are assembled at opposite ends of the metal housing through laser welding.

[0015] Each receiving detector package is housed in a corresponding TO package, and each TO package is fixed to the metal shell by optical adhesive; three TO packages are arranged on two opposite sides of the metal shell.

[0016] A lens and a wave plate are arranged in sequence along the input straight line direction at the input port of a single receiving detector; and a core end lens is arranged between the wave splitter and the optical fiber adapter.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This utility model uses a wave plate combination structure to balance cost reduction and port integration density improvement, achieving three-way transmission and three-reception on a coaxial single fiber, supporting the coexistence of three generations of PON, and effectively improving and ensuring product reliability, achieving optimal performance and cost, and greatly contributing to the marketization of the product.

[0019] The utility model also has the following advantages:

[0020] The wavelength splitter uses three filters arranged at an angle to split the outgoing light from the fiber optic adapter into three different collimated beams. The tilt angle of the filters can be selected based on the channel spacing at the receiving end and the wavelength spacing to suit different application scenarios.

[0021] The hybrid packaging structure of a BOX shell and an external splitter not only helps to reduce the size of the device, but also increases the port density by 50%. The overall packaging process is simple and the cost is moderate. It can meet the requirements of 50G PON three-mode transmission or other application scenarios that require single-fiber three-transmitter and three-receiver. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of Example 1 of the present utility model.

[0023] Figure 2 This is a schematic diagram of the optical path of the first embodiment of the present invention.

[0024] Figure 3 This is a structural diagram of the second embodiment of the present utility model.

[0025] Figure 4 This is a schematic diagram of the optical path of the second embodiment of the present utility model.

[0026] Figure 5 This is a structural diagram of embodiment 3 of the present utility model.

[0027] Figure 6 This is a schematic diagram of the optical path of the third embodiment of the present utility model.

[0028] Wherein: 1. BOX shell; 2. First filter; 3. First receiving detector; 4. Second filter; 5. Second receiving detector; 6. Third filter; 7. Third receiving detector; 8. Ferrule end lens; 9. Fiber optic adapter;

[0029] 11. Transmitting laser; 12. Lens 1; 13. Light combining component; 14. Isolator;

[0030] 21, wave plate 1; 41, wave plate 2; 61, wave plate 3;

[0031] 31. Wave plate four; 32. Lens two; 51. Wave plate five; 52. Lens three; 71. Wave plate six; 72. Lens four. DETAILED DESCRIPTION

[0032] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0033] like Figure 1As shown, a single-fiber three-transmitter and three-receiver device with a hybrid BOX and coaxial TO package in this embodiment includes a wave splitter, a light combining component 13 is arranged behind the wave splitter, and a fiber optic adapter 9 is arranged in front of the wave splitter. The light combining component 13, the wave splitter, and the fiber optic adapter 9 are located on the same straight optical path; the wave splitter includes three filters arranged at intervals along the straight optical path, namely a first filter 2, a second filter 4, and a third filter 6, and the three filters are arranged at an angle of 8-45°; the light emitted from the fiber optic adapter 9 is reflected by the three filters in the wave splitter in turn and divided into three collimated light beams, and the three collimated light beams are emitted perpendicular to the straight optical path to each receiving detector.

[0034] In this embodiment, a wave splitter is formed by a wave plate assembly structure, which effectively takes into account both cost reduction and improvement of port integration density, and realizes three-transmit and three-receive coaxial single-fiber.

[0035] In this embodiment, the three filters are arranged at an angle in the wavelength splitter to reflect the outgoing light from the optical fiber adapter 9 into three different collimated light beams; the inclination angle of the filter can be selected and arranged according to the channel spacing of the receiving end and the wavelength spacing, so as to be suitable for different application scenarios.

[0036] The tilt angles of the three filters are one, two or three of 8°, 13° and 45° respectively.

[0037] In this embodiment, the inclination angle of the filter is the angle formed between the filter and the vertical plane of the straight light path, such as Figure 1 As shown in α.

[0038] The filter tilt angle is 8°, which is used in application scenarios with wavelength intervals less than 20nm; the filter tilt angle is 13°, which is used in application scenarios with wavelength intervals between 20-50nm; and the filter tilt angle is 45°, which is used in application scenarios with wavelength intervals greater than 50nm.

[0039] When the inclination angle of the filter is less than 45°, the collimated light beam reflected by the filter is tilted back relative to the straight light path and emitted to the wave plate. The wave plate is located outside the straight light path. After being reflected by the wave plate, the collimated light beam is emitted to the receiving detector in a direction perpendicular to the straight light path.

[0040] When the filter is tilted at an angle of 45°, the collimated light beam reflected by the filter is emitted to the receiving detector in a direction perpendicular to the straight light path.

[0041] In this embodiment, the filter tilt angle can be selected according to the channel spacing and wavelength spacing of each receiving end.

[0042] The larger the tilt angle of the filter, the smaller the channel spacing at the receiving end, and the smaller the size of the optical device on the coaxial straight optical path; when the tilt angle of the filter reaches 45°, the light reflected and separated by the filter is emitted perpendicular to the straight optical path to the receiving detector, and the channel spacing is minimized.

[0043] It also includes a BOX shell 1, and a light-combining component 13 is located in the BOX shell 1. Three groups of emitting lasers 11 are orderly arranged and encapsulated in the BOX shell 1 on one side of the light-combining component 13. The light emitted by the three groups of emitting lasers 11 is combined into a collimated light beam through the light-combining component 13. A window for the collimated light beam to be emitted is opened on the BOX shell 1.

[0044] A lens 12 is arranged between each single emitting laser 11 and the light combining component 13, and an isolator 14 is arranged between the light outlet of the light combining component 13 and the window of the BOX shell 1; the light combining component 13 is a PBS optical component or a Z-Block optical component.

[0045] PBS optical assembly is the abbreviation of Polarizing Beamsplitters. The PBS optical assembly in this embodiment includes three optical assemblies corresponding to the three groups of laser emitters. Each optical assembly is composed of two right-angle prisms glued together with their hypotenuses, and the prisms are coated with polarizing beamsplitter film on the oblique surfaces.

[0046] The wavelength splitter is housed in a metal housing, and the BOX housing 1 and the optical fiber adapter 9 are assembled at opposite ends of the metal housing via laser welding.

[0047] In this embodiment, a hybrid packaging structure of the BOX shell 1 and the external splitter is adopted, which not only helps to reduce the size of the device, but also can increase the port density by 50%. In addition, the overall packaging process is simple and the cost is moderate, which can meet the requirements of 50G PON three-mode transmission or other application scenarios requiring single-fiber three-transmitter and three-receiver.

[0048] Each receiving detector package is housed in a corresponding TO package, and each TO package is fixed to the metal shell by optical adhesive; three TO packages are arranged on two opposite sides of the metal shell.

[0049] In this embodiment, the middle TO package is located on one side of the metal shell, and the other two TO packages are located on the other side of the metal shell, which effectively contributes to the compactness of the overall layout and helps to reduce the overall volume.

[0050] A lens and a wave plate are arranged in sequence along the input straight line direction at the input port of a single receiving detector; a ferrule end lens 8 is arranged between the wave splitter and the optical fiber adapter 9.

[0051] In this embodiment, the center lines of the optical paths from the transmitting laser, the lens to the optical fiber adapter 9 are on the same straight line, forming a coaxial hybrid package.

[0052] In this embodiment, the optical path sequence at the transmitting end is as follows: the light emitted by the transmitting laser 11 is collimated into parallel light by lens 12, and then the three parallel lights are combined into one parallel light by the light combining component 13, and then converged to the optical fiber adapter 9 after passing through the isolator 14, various filters, and the core end lens 8.

[0053] In this embodiment, the optical path sequence at the receiving end is as follows: the converged light emitted by the optical fiber adapter 9 is collimated into parallel light through the ferrule end lens 8, and is divided into three parallel light beams through three filters. The three parallel light beams are respectively converged through lenses to three corresponding receiving detectors.

[0054] Example 1:

[0055] like Figure 1 and Figure 2 As shown, the three filters arranged along the straight optical path in the wave splitter are: a first filter 2 arranged tilted backward, a second filter 4 arranged tilted forward, and a third filter 6 arranged tilted backward, and the tilt angle of the filters is 8° or 13°; outside the straight optical path, wave plate 1 21, wave plate 2 41, and wave plate 3 61 are arranged corresponding to the three filters; outside the straight optical path, a first receiving detector 3, a second receiving detector 5, and a third receiving detector 7 are arranged corresponding to the three filters, wherein the input end of the first receiving detector 3 is provided with wave plate 4 31 and lens 2 32, the input end of the second receiving detector 5 is provided with wave plate 51 and lens 3 52, and the input end of the third receiving detector 7 is provided with wave plate 6 71 and lens 4 72. The first receiving detector 3 and the third receiving detector 7 are arranged on the same side of the straight optical path, and the second receiving detector 5 is arranged on the other side of the straight optical path.

[0056] The converged light emitted by the optical fiber adapter 9 is collimated into parallel light by the ferrule end lens 8 and emitted backward. When the emitted light passes through the third filter 6, it is reflected and transmitted, and is reflected toward the wave plate three 61 to separate the uplink light. After being reflected by the wave plate three 61, the uplink light is perpendicular to the straight optical path and is incident on the third receiving detector 7 through the wave plate six 71 and the lens four 72; the emitted light that passes through the third filter 6 backward is reflected and transmitted when passing through the second filter 4, and is reflected toward the wave plate two 41 to separate the uplink light. After being reflected by the wave plate two 41, the uplink light is perpendicular to the straight optical path and is incident on the second receiving detector 5 through the wave plate five 51 and the lens three 52; the emitted light that passes through the second filter 4 backward is reflected when passing through the first filter 2, and is reflected toward the wave plate one 21 to form the uplink light. After being reflected by the wave plate one 21, the uplink light is perpendicular to the straight optical path and is incident on the first receiving detector 3 through the wave plate four 31 and the lens two 32.

[0057] Example 2:

[0058] like Figure 3and Figure 4 As shown, the three filters arranged along the straight optical path in the wave splitter are: a first filter 2 arranged tilted backward, a second filter 4 arranged tilted forward at 45°, and a third filter 6 arranged tilted backward. The tilt angles of the first filter 2 and the third filter 6 are 8° or 13°; outside the straight optical path, wave plate 1 21 and wave plate 3 61 are arranged corresponding to the first filter 2 and the third filter 6; outside the straight optical path, a first receiving detector 3, a second receiving detector 5, and a third receiving detector 7 are arranged corresponding to the three filters, wherein the input end of the first receiving detector 3 is provided with wave plate 4 31 and lens 2 32, the input end of the second receiving detector 5 is provided with wave plate 51 and lens 3 52, and the input end of the third receiving detector 7 is provided with wave plate 6 71 and lens 4 72. The first receiving detector 3 and the third receiving detector 7 are arranged on the same side of the straight optical path, and the second receiving detector 5 is arranged on the other side of the straight optical path.

[0059] The converged light emitted by the optical fiber adapter 9 is collimated into parallel light by the ferrule end lens 8 and emitted backward. When the emitted light passes through the third filter 6, it is reflected and transmitted, and is reflected toward the wave plate three 61 to separate the uplink light. After being reflected by the wave plate three 61, the uplink light is perpendicular to the straight optical path and is incident on the third receiving detector 7 through the wave plate six 71 and the lens four 72; the emitted light that passes through the third filter 6 backward is reflected and transmitted when passing through the second filter 4. After being reflected by the second filter 4, the uplink light formed is perpendicular to the straight optical path and is incident on the second receiving detector 5 through the wave plate five 51 and the lens three 52; the emitted light that passes through the second filter 4 backward is reflected when passing through the first filter 2, and is reflected toward the wave plate one 21 to form the uplink light. After being reflected by the wave plate one 21, the uplink light is perpendicular to the straight optical path and is incident on the first receiving detector 3 through the wave plate four 31 and the lens two 32.

[0060] Example 3:

[0061] like Figure 5 and Figure 6As shown, the three filters arranged along the straight optical path in the wave splitter are: a first filter 2 arranged at a 45° forward tilt, a second filter 4 arranged at a forward tilt, and a third filter 6 arranged at a backward tilt, and the tilt angles of the second filter 4 and the third filter 6 are 8° or 13°; outside the straight optical path, a wave plate 2 41 and a wave plate 3 61 are arranged corresponding to the second filter 4 and the third filter 6; outside the straight optical path, a first receiving detector 3, a second receiving detector 5, and a third receiving detector 7 are arranged corresponding to the three filters, wherein the input end of the first receiving detector 3 is provided with a wave plate 4 31 and a lens 2 32, the input end of the second receiving detector 5 is provided with a wave plate 51 and a lens 3 52, and the input end of the third receiving detector 7 is provided with a wave plate 6 71 and a lens 4 72. The first receiving detector 3 and the third receiving detector 7 are arranged on the same side of the straight optical path, and the second receiving detector 5 is arranged on the other side of the straight optical path.

[0062] The converged light emitted by the optical fiber adapter 9 is collimated into parallel light by the ferrule end lens 8 and emitted backward. When the emitted light passes through the third filter 6, it is reflected and transmitted, and is reflected toward the wave plate three 61 to separate the uplink light. After being reflected by the wave plate three 61, the uplink light is perpendicular to the straight optical path and is incident on the third receiving detector 7 through the wave plate six 71 and the lens four 72; the emitted light that passes through the third filter 6 backward is reflected and transmitted when passing through the second filter 4, and is reflected toward the wave plate two 41 to separate the uplink light. After being reflected by the wave plate two 41, the uplink light is perpendicular to the straight optical path and is incident on the second receiving detector 5 through the wave plate five 51 and the lens three 52; the emitted light that passes through the second filter 4 backward is reflected when passing through the first filter 2, forming an uplink light perpendicular to the straight optical path, and is incident on the first receiving detector 3 through the wave plate four 31 and the lens two 32.

[0063] This utility model takes into account both cost reduction and improvement of port integration density, realizes three-transmit and three-receive on a coaxial single fiber, supports the coexistence of three generations of PON, and effectively improves and ensures product reliability, achieving the best performance and cost, greatly contributing to the marketization of the product.

[0064] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the scope of protection of the utility model.

Claims

1. A single-fiber three-transmitter and three-receiver device with a hybrid BOX and coaxial TO package, characterized by: The invention comprises a wave splitter, a light combining component (13) is arranged behind the wave splitter, and an optical fiber adapter (9) is arranged in front of the wave splitter. The light combining component (13), the wave splitter and the optical fiber adapter (9) are located on the same straight optical path. The wave splitter comprises three filters arranged at intervals along the straight optical path, namely a first filter (2), a second filter (4) and a third filter (6). The three filters are arranged at an angle of 8-45 degrees. Light emitted from the optical fiber adapter (9) is reflected by the three filters in the wave splitter in sequence and is divided into three collimated light beams. The three collimated light beams are emitted perpendicularly to the straight optical path to each receiving detector.

2. A single-fiber three-transmitter and three-receiver device with a BOX and coaxial TO hybrid package as claimed in claim 1, characterized in that: The tilt angles of the three filters are one, two or three of 8°, 13° and 45° respectively.

3. The BOX and coaxial TO hybrid packaged single-fiber three-transmitter and three-receiver device according to claim 2, characterized in that: The filter has an inclination angle of 8°, which is used in application scenarios with a wavelength interval of less than 20nm; the filter has an inclination angle of 13°, which is used in application scenarios with a wavelength interval of 20-50nm; and the filter has an inclination angle of 45°, which is used in application scenarios with a wavelength interval of more than 50nm.

4. The BOX and coaxial TO hybrid packaged single-fiber three-transmitter and three-receiver device according to claim 1, characterized in that: When the inclination angle of the filter is less than 45°, the collimated light beam reflected by the filter is tilted back relative to the straight light path and emitted to the wave plate. The wave plate is located outside the straight light path. After being reflected by the wave plate, the collimated light beam is emitted to the receiving detector in a direction perpendicular to the straight light path.

5. The BOX and coaxial TO hybrid packaged single-fiber three-transmitter and three-receiver device according to claim 1, characterized in that: When the inclination angle of the filter is 45°, the collimated light beam reflected by the filter is emitted to the receiving detector in a direction perpendicular to the straight light path.

6. The BOX and coaxial TO hybrid packaged single-fiber three-transmitter and three-receiver device according to claim 1, characterized in that: The invention also includes a BOX shell (1), a light combining component (13) located in the BOX shell (1), and three groups of emitting lasers (11) are arranged and packaged in an orderly manner in the BOX shell (1) located on one side of the light combining component (13). Light emitted by the three groups of emitting lasers (11) is combined into a collimated light beam through the light combining component (13), and a window for the collimated light beam to be emitted is opened on the BOX shell (1).

7. A single-fiber three-transmitter and three-receiver device with a hybrid BOX and coaxial TO package as claimed in claim 6, characterized in that: A lens (12) is arranged between a single emitting laser (11) and a light combining component (13), and an isolator (14) is arranged between a light outlet of the light combining component (13) and a window of a BOX shell (1); the light combining component (13) is a PBS light component or a Z-Block light component.

8. The BOX and coaxial TO hybrid packaged single-fiber three-transmitter and three-receiver device according to claim 6, characterized in that: The wave splitter is housed in a metal shell, and the BOX shell (1) and the optical fiber adapter (9) are assembled at opposite ends of the metal shell via laser welding.

9. The BOX and coaxial TO hybrid packaged single-fiber three-transmitter and three-receiver device according to claim 1, characterized in that: Each receiving detector package is accommodated in a corresponding TO package, and each TO package is fixed to the metal shell by optical adhesive; three TO packages are arranged on two opposite sides of the metal shell.

10. The BOX and coaxial TO hybrid packaged single-fiber three-transmitter and three-receiver device according to claim 1, characterized in that: A lens and a wave plate are arranged in sequence along the input straight line direction at the input port of a single receiving detector; and a core end lens (8) is arranged between the wave splitter and the optical fiber adapter (9).

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