Combo PON optical device

Abstract

The utility model provides a Combo PON optical device, which comprises a shell, an optical port, a wave combining TO structure, a first receiving detector and a second receiving detector are arranged on the shell, a converging lens and a prism assembly are arranged in the shell, the wave combining TO structure combines two transmitting wave band light into one path, and the first receiving detector and the second receiving detector are arranged on the shell. The light is sequentially transmitted by the prism assembly and converted into converged light by the converging lens, and then the converged light is input into the light port; the converging lens is also used for converting light of two receiving wavebands input by the light port into parallel light; and the prism assembly is also used for dividing the parallel light of the two receiving wavebands into two paths which are respectively incident to the first receiving detector and the second receiving detector. The Combo PON optical device has the advantages of being small in size, light in weight, low in power consumption, high in coupling efficiency, high in reliability, easy to dissipate heat, easy to control working temperature, good in performance, high in confidentiality, low in cost and easy to assemble.

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] With the continuous development of communication technology, people have increasingly higher requirements for the performance and quality of various functional modules in communication devices. Existing communication equipment typically uses a variety of communication devices and four-port optoelectronic devices (Combo) to improve the propagation effect of optical and electrical signals during communication.

[0003] With the rapid development of Fiber to the Home (FTTH) network technology, GPON (Gigabit Passive Optical Network) has become the standard choice for most operators worldwide. However, as users' demands for higher bandwidth, symmetrical speeds, and lower latency continue to increase, XG(S)-PON (10G Passive Optical Network) is gradually gaining attention as a next-generation fiber access technology. Against this backdrop, Combo PON technology has emerged. However, existing coaxial Combo PON devices suffer from low coupling efficiency, poor heat dissipation, and large device size, failing to meet the trend of miniaturization in optical modules. Utility Model Content

[0004] The purpose of this invention is to provide a Combo PON optical device that can at least solve some of the defects existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A Combo PON optical device includes a housing, on which an optical port, a multiplexing (TO) structure, a first receiving detector, and a second receiving detector are mounted. A converging lens and a prism assembly are installed inside the housing. The TO structure combines two transmitted light bands into one beam, which is then transmitted through the prism assembly and converted into converged light by the converging lens before being input to the optical port. The converging lens further converts the two received light bands input to the optical port into parallel light, and the prism assembly further splits the parallel light of the two received light bands into two separate beams, which are then incident on the first and second receiving detectors respectively.

[0007] Furthermore, an isolator is provided between the wave-combining TO structure and the prism assembly.

[0008] Furthermore, the prism assembly includes a first prism, a second prism, and a third prism. The first prism has a first inclined surface for transmitting one of two receiving wavelengths of light and reflecting the other wavelength, and a second inclined surface for reflecting the reflected light from the first inclined surface. The second prism is bonded to the first inclined surface of the first prism, and the second prism has a third inclined surface for reflecting the transmitted light from the first inclined surface. The third prism is bonded to the third inclined surface of the second prism.

[0009] Furthermore, the first receiving detector corresponds to the first prism and is used to receive the reflected light from the second inclined surface of the first prism; the second receiving detector corresponds to the second prism and is used to receive the reflected light from the third inclined surface of the second prism.

[0010] Furthermore, the wave combining TO structure includes a first laser, a second laser, a first collimating lens, a second collimating lens, and a PBS prism. The emitted light from the first laser and the second laser is converted into parallel light by the first collimating lens and the second collimating lens, respectively. The PBS prism is used to combine the parallel light converted by the first collimating lens and the second collimating lens into a single beam.

[0011] Furthermore, the wave-combining TO structure also includes a TEC, to which both the first laser and the second laser are connected.

[0012] Furthermore, the wave-combining TO structure also includes a thermistor for detecting the temperature of the first laser and the second laser.

[0013] Furthermore, the wave combiner TO structure also includes a first MPD and a second MPD for monitoring the backward optical power of the first laser and the second laser, respectively.

[0014] Furthermore, the wave combiner TO structure also includes a capacitor for controlling signal commands during the modulation process of the optical device.

[0015] Furthermore, the optical port is coupled and fixed to the housing via an optical port adjustment ring.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] (1) The optical path of the Combo PON optical device provided by this utility model adopts a BOX wave-combining packaging design, which reduces the size of the device while improving the coupling efficiency of the laser and the detector, and ensuring the stability of the optical path structure.

[0018] (2) The Combo PON optical device provided by this utility model uses a specially designed prism assembly to replace the traditional method of using multiple filters to achieve the beam splitting function, which is simpler to assemble and saves space.

[0019] (3) The Combo PON optical device provided by this utility model separates the optical port and the convergence lens, improves the coupling efficiency, eliminates the assembly error of passive components through coupling, and has low cost.

[0020] (4) The Combo PON optical device provided by this utility model shares a TEC with the first laser and the second laser, which has better heat dissipation and can better maintain the operating temperature.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] Figure 1 This is an external axonometric view of the Combo PON optical device of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the Combo PON optical device of this utility model;

[0024] Figure 3 This is a schematic diagram of the prism assembly in the Combo PON optical device of this utility model.

[0025] Explanation of reference numerals in the attached drawings: 1. Optical port; 2. First receiving detector; 3. Housing; 4. Multiplexing TO structure; 5. Second receiving detector; 6. Optical port adjustment ring; 7. Lens sleeve; 8. Converging lens; 9. Prism assembly; 10. Isolator; 11. TEC; 12. First collimating lens; 13. First laser; 14. First MPD; 15. Capacitor; 16. Thermistor; 17. Second MPD; 18. Second laser; 19. Second collimating lens; 20. PBS prism; 21. First prism; 22. Second prism; 23. Third prism; 24. First inclined plane; 25. Second inclined plane; 26. Third inclined plane. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, abutting connections, or integral connections. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] 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.

[0030] like Figure 1 and Figure 2 As shown, this embodiment provides a Combo PON optical device, including a housing 3. The housing 3 is equipped with an optical port 1, a multiplexing TO structure 4, a first receiving detector 2, and a second receiving detector 5. A converging lens 8 and a prism assembly 9 are installed inside the housing 3. The multiplexing TO structure 5 combines two transmitted light bands into one beam, which is then transmitted through the prism assembly 9 and converted into converged light by the converging lens 8 before being input to the optical port 1. The converging lens 8 is also used to convert the two received light bands input to the optical port 1 into parallel light. The prism assembly 9 is also used to split the parallel light of the two received light bands into two paths, which are respectively incident on the first receiving detector 2 and the second receiving detector 5. In this embodiment, the housing 3 serves as the assembly carrier for each optical component. The housing 3 highly integrates the optical port 1, the multiplexing TO structure 4, the first receiving detector 2, the second receiving detector 5, the converging lens 8, and the prism assembly 9, thereby achieving miniaturization of the optical device. At the same time, the optical path structure adopts a BOX multiplexing packaging design, which reduces the size of the optical device while improving the coupling efficiency of the laser and detector, ensuring the stability of the optical path structure. Furthermore, the optical port and the converging lens are designed separately, which improves the coupling efficiency. The coupling eliminates the assembly error of passive components and reduces costs.

[0031] In some embodiments, the housing 3 is designed as a generally cuboid structure, integrating four ports: an optical port, a laser port, and two detector ports, for mounting the optical port 1, the multiplexing TO structure 4, the first receiving detector 2, and the second receiving detector 5. Specifically, the ports of the optical port 1 and the multiplexing TO structure 4 are respectively located on the left and right end faces of the housing 3, while the ports of the first receiving detector 2 and the second receiving detector 5 are respectively located on the top and bottom end faces of the housing 3. Ideally, the cuboid requires a dimensional tolerance of ±0.05mm, and local areas require deburring, smoothing, and flatness treatment to facilitate welding and bonding of passive components and better adapt to the modular structure.

[0032] Preferably, the optical port 1 is coupled and fixed to the housing 3 via the optical port adjustment ring 6 to ensure structural stability and the reliability of the optical device.

[0033] In some embodiments, an isolator 10 is also installed inside the housing 3. The isolator 10 is arranged between the wave-combining TO structure 4 and the prism assembly 9 for unidirectional light output of the wave-combining TO structure 4, preventing light reflection from affecting the laser performance in the wave-combining TO structure 4 and improving return loss.

[0034] In some embodiments, such as Figure 3 As shown, the prism assembly 9 includes a first prism 21, a second prism 22, and a third prism 23. The first prism 21 has a first inclined surface 24 for transmitting one of two received wavelengths of light and reflecting the other wavelength, and a second inclined surface 25 for reflecting the reflected light from the first inclined surface 24. The second prism 22 is bonded to the first inclined surface 24 of the first prism 21, and has a third inclined surface 26 for reflecting the transmitted light from the first inclined surface 24. The third prism 23 is bonded to the third inclined surface 26 of the second prism 22. Optionally, the first receiving detector 2 corresponds to the first prism 21 and is used to receive the reflected light from the second inclined surface 25 of the first prism 21; the second receiving detector 5 corresponds to the second prism 22 and is used to receive the reflected light from the third inclined surface 26 of the second prism 22.

[0035] During installation, the first prism 21 is positioned near the optical port 1, and the third prism 23 is positioned near the beam combiner TO structure 4. The beam emitted from the beam combiner TO structure 4 is transmitted sequentially through the third prism 23, the second prism 22, and the first prism 21 before entering the converging lens. 8 is converted into focused light and output from optical port 1; when the two receiving band lights input from optical port 1 are incident on prism assembly 9, the two receiving band lights first pass through the first prism 21 and are incident on the first inclined surface 24. At the first inclined surface 24, one of the two receiving band lights passes through the first inclined surface 24 and enters the second prism 22, while the other band light is reflected on the first inclined surface 24. The reflected light is incident on the second inclined surface 25, and after being reflected again on the second inclined surface 25, it passes vertically upward through the first prism 21 and is incident on the first receiving detector 2; the band light that passes through the first inclined surface 24 and enters the second prism 22 is incident on the third inclined surface 26, is reflected on the third inclined surface 26, and passes vertically downward through the second prism 22 and is incident on the second receiving detector 5. In this embodiment, the prism assembly 9 with this structural design replaces the traditional method of using multiple filters to achieve the beam splitting function. It is easy to assemble, avoids the need to add a specific filter bracket, and occupies less space than installing multiple filters. The installation process is also simpler and more convenient.

[0036] In some embodiments, such as Figure 2 As shown, the wave-combining TO structure 4 includes a first laser 13, a second laser 18, a first collimating lens 12, a second collimating lens 19, and a PBS prism 20. The emitted light from the first laser 13 and the second laser 18 is converted into parallel light by the first collimating lens 12 and the second collimating lens 19, respectively. The PBS prism 20 is used to combine the parallel light converted by the first collimating lens 12 and the second collimating lens 19 into a single beam. The two beams emitted by the first laser 13 and the second laser 18 at different emission bands are combined by the PBS prism 20. Compared with the conventional 45° diaphragm wave-combining, the PBS prism 20 has a larger contact area, better angle control, higher coupling efficiency, and lower crosstalk. Optionally, in this embodiment, the first laser 13 and the second laser 18 emit lasers with wavelengths of 1577nm and 1490nm, respectively. Using the optical path structure design of the Combo PON optical device in this embodiment, the coupling efficiency of the 1577nm laser reaches as high as 73%, and the coupling efficiency of the 1490nm laser can reach 80%, while the coupling efficiency of the 1577nm laser in traditional coaxial devices is only 50%. Of course, the first laser 13 and the second laser 18 can also be selected to emit lasers with different wavelengths according to actual needs.

[0037] In an optimized configuration, the wave-combining TO structure 4 further includes a TEC 11, to which both the first laser 13 and the second laser 18 are connected. The first laser 13 and the second laser 18 share a single TEC 11 for heat dissipation. For example, when a 1577nm laser and a 1490nm laser (i.e., the first laser and the second laser) share a single TEC 11, heat dissipation is improved for both the 1577nm and 1490nm lasers, and the heat transfer efficiency (TE) is more effectively maintained. Compared to the method of heating the coaxial 1577nm laser on the TO, this shared TEC 11 heat dissipation method is more effective at dissipating heat and keeping the components at their optimal operating temperature. Furthermore, the 1490nm laser only requires a room-temperature LD chip, reducing costs.

[0038] Preferably, the wave combiner TO structure 4 further includes a thermistor 16, an MPD, and a capacitor 15. The thermistor 16 is used to detect the temperature changes of the first laser 13 and the second laser 18 and feeds the feedback to the temperature control circuit. The TEC 11 adjusts its current to maintain the laser temperature stability based on the feedback from the thermistor 16. Two MPDs are designed, namely the first MPD 14 and the second MPD 17, which are used to monitor the backward optical power of the first laser 13 and the second laser 18, respectively. The capacitor 15 is used for control signal commands during the modulation of the optical device. The number of capacitors 15 can be designed according to actual needs. In this embodiment, three capacitors 15 are specifically set.

[0039] The assembly process of the Combo PON optical device in this embodiment is as follows:

[0040] Step 1: The housing 3 is used to connect the ports and serve as a carrier for the various related optical components. The optical components are bonded in the following order: converging lens 8, lens sleeve 7, prism assembly 9, and isolator 10.

[0041] Step 2: Assembly sequence of the combined wave TO structure 4: TEC11, 1577 laser, first MPD 14, first capacitor, thermistor 16, second capacitor, third capacitor, first collimating lens 12, 1490 laser, second MPD 17, second collimating lens 19, PBS prism 20.

[0042] Step 3: The wave-combining TO structure 4 assembled in Step 2 is fixed to the housing 3 by laser welding, and the optical port 1 is fixed to the housing 3 by laser welding to ensure the shear force and reliability of the product.

[0043] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A Combo PON optical device comprising a housing, characterized by: The shell is provided with a light port, a wave combining TO structure, a first receiving detector and a second receiving detector, and is provided with a converging lens and a prism assembly inside the shell, the wave combining TO structure combines two emission waveband lights into one, which is transmitted by the prism assembly and converted into converging light by the converging lens and then input into the light port; the converging lens is also used to convert two receiving waveband lights input by the light port into parallel light, and the prism assembly is also used to split the two receiving waveband parallel lights into two paths and input into the first receiving detector and the second receiving detector respectively.

2. The Combo PON optical device of claim 1, wherein: An isolator is arranged between the wave combining TO structure and the prism assembly.

3. The Combo PON optical device as described in claim 1, characterized in that: The prism assembly comprises a first prism, a second prism and a third prism, the first prism has a first inclined surface for transmitting one waveband of two receiving waveband lights and reflecting the other waveband light, and a second inclined surface for reflecting the reflected light of the first inclined surface; the second prism is bonded with the first inclined surface of the first prism, the second prism has a third inclined surface for reflecting the transmitted light of the first inclined surface, and the third prism is bonded with the third inclined surface of the second prism.

4. The Combo PON optical device of claim 3, wherein: The first receiving detector corresponds to the first prism and is used to receive the reflected light of the second inclined surface of the first prism; the second receiving detector corresponds to the second prism and is used to receive the reflected light of the third inclined surface of the second prism.

5. The Combo PON optical device as described in claim 1, characterized in that: The wave combining TO structure comprises a first laser, a second laser, a first collimating lens, a second collimating lens and a PBS prism, the emitted light of the first laser and the second laser is converted into parallel light by the first collimating lens and the second collimating lens respectively, and the PBS prism is used to combine the parallel light converted by the first collimating lens and the second collimating lens into one light beam.

6. The Combo PON optical device of claim 5, wherein: The wave combining TO structure further comprises a TEC, and the first laser and the second laser are connected with the TEC.

7. The Combo PON optical device of claim 6, wherein: The wave combining TO structure further comprises a thermistor for detecting the temperature of the first laser and the second laser.

8. The Combo PON optical device of claim 5, wherein: The wave combining TO structure further comprises a first MPD and a second MPD for monitoring the backward optical power of the first laser and the second laser respectively.

9. The Combo PON optical device of claim 5, wherein: The wave combining TO structure further comprises a capacitor for controlling the signal instruction in the modulation process of the optical device.

10. The Combo PON optical device as described in claim 1, characterized in that: The light port is coupled and fixed on the shell through a light port adjusting ring.

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