BOX-ray device structure for 50G PON (Passive Optical Network)

Abstract

The invention relates to the technical field of optical devices, in particular to a BOX optical device structure for a 50G PON (Passive Optical Network), which mainly comprises a flexible board, a shell and an optical fiber interface component, the optical fiber interface component is connected to one end of the shell, the flexible board is arranged in the shell, a plurality of high-speed laser chips and detector chips are connected onto the flexible board, and the high-speed laser chips and the detector chips are connected onto the shell. The high-speed laser chip is connected with a laser, and the detector chip is connected with a receiving end optical assembly. By means of the structure, the BOX scheme design is adopted, the sealing performance is better, and the valve can better adapt to the complex application environment. The structure design is simplified, production and manufacturing are easier, the product precision and the process stability can be guaranteed, the product yield can be improved, and production and manufacturing are better. According to the technical scheme, heat dissipation of the three lasers is regulated and controlled through the same TEC, and finer regulation and control can be achieved through the thermistor. According to the overall heat dissipation scheme, the overall heat dissipation requirement of the BOX can be met through cooperation of the bottom of the BOX and the heat conduction material.

Description

Technical Field

[0001] The present invention relates to the technical field of optical devices, and in particular to a BOX optical device structure for 50G PON. Background Art

[0002] With the growing demand for higher bandwidth and the development of emerging applications such as 4K / 8K video, virtual reality (VR), augmented reality (AR), and the Internet of Things (IoT), the existing 10G-PON technology is gradually unable to meet market demand. Therefore, the industry has begun to explore the next generation of PON technology, namely 50G PON. In order to protect existing investments, simplify the upgrade process, reduce operational complexity, and ensure the smoothness and cost advantages of network evolution, the 50G PON solution needs to be compatible with the existing GPON and 10G-PON solutions.

[0003] At present, the more mature solution is to use the principles of spectroscopic technology and spatial optics to integrate multiple transmitting TO optical components and receiving TO optical components into a TO tube package. Among them, different lasers and avalanche photodiodes need to be packaged in a separate TO tube, and then single-fiber multi-directional transmission is achieved through filters, prisms and lenses.

[0004] Although the existing technical solutions can realize the product functions to a certain extent, there are still some problems and shortcomings. The common TO shell packaging has the following shortcomings: 1. The overall structure is complex, the TO shell production process is relatively cumbersome, and the production cycle is long; 2. The TO shell structure is often in different directions, and it is difficult to have a good heat dissipation design solution to ensure that each shell has good heat dissipation; 3. Different TO shell assemblies have high requirements for coupling tolerance and optical path alignment, the product performance is poor, and the product yield is not high in mass production. Summary of the invention

[0005] The object of the present invention is to provide a BOX optical device structure for 50G PON to solve the above problems in the prior art.

[0006] The present invention is achieved through the following technical solutions:

[0007] A BOX optical device structure for 50G PON includes a flexible board, a housing, and an optical fiber interface assembly, wherein the optical fiber interface assembly is connected to one end of the housing, and the flexible board is arranged in the housing:

[0008] The flexible board is connected to a plurality of high-speed laser chips and detector chips, the high-speed laser chip is connected to three lasers, and the detector chip is connected to a receiving optical component;

[0009] A collimating lens is arranged on one side of the laser, an isolator is arranged on the side of the collimating lens away from the laser, a first light combiner is arranged on the side of the isolator away from the collimating lens, and a filter is arranged on the side of the first light combiner away from the isolator;

[0010] A focusing lens is disposed on one side of the detector chip, a second light combiner is disposed on a side of the focusing lens away from the detector chip, and a first deflecting prism is disposed on a side of the second light combiner away from the focusing lens;

[0011] A reflecting prism is arranged on one side of the filter and the first deflecting prism close to the optical fiber interface assembly.

[0012] Preferably, both the incident surface and the exit surface of the collimating lens and the focusing lens are provided with an anti-reflection film.

[0013] Preferably, the light splitting surfaces of the first light combiner and the second light combiner are provided with a film layer, and the light emitting surfaces thereof are provided with an anti-reflection film.

[0014] Preferably, the splitting angles of the first light combiner and the second light combiner are 13.5 degrees.

[0015] Preferably, the angle of the filter is 20 degrees.

[0016] Preferably, a reflective film is provided on the surface of the reflective prism.

[0017] Preferably, both the incident surface and the exit surface of the first deflecting prism are provided with an anti-reflection film.

[0018] Preferably, the receiving optical component includes a base, a second deflecting prism, an avalanche photodiode and a transimpedance amplifier, the avalanche photodiode is connected to the transimpedance amplifier, and the second deflecting prism is arranged on the base.

[0019] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0020] 1. The structure provided by the present invention mainly includes a flexible board, a shell and an optical fiber interface component. The optical fiber interface component is connected to one end of the shell. The flexible board is arranged in the shell. Several high-speed laser chips and detector chips are connected to the flexible board. The high-speed laser chip is connected to a laser. The detector chip is connected to a receiving optical component. Through the above structure, the BOX solution design is adopted, the sealing performance is better, and it can better adapt to complex application environments.

[0021] 2. Simplified structural design, easier to produce: The internal structure of the BOX of this solution is simple. In addition to the coupling of the lens, other components can be mounted through conventional patch methods. This can not only ensure the accuracy of the product and the stability of the process, but also improve the yield of the product and better production. In particular, the BOX solution has better integration and more concentrated pads, which can achieve faster connection with the electrical chip and better electrical performance.

[0022] 3. Better heat dissipation performance: This technical solution uses the same TEC to control the heat dissipation of three lasers, and can also be more finely controlled through thermistors. The overall heat dissipation solution can be combined with the heat conductive material at the bottom of the BOX to achieve the overall heat dissipation requirements of the BOX. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a schematic diagram of the top view of the structure of the 50G PON BOX optical device of the present invention.

[0025] Icons: 1-flexible board, 2-housing, 3-laser, 4-collimating lens, 5-isolator, 6-first optical combiner, 7-filter, 8-optical fiber interface assembly, 9-reflecting prism, 10-first deflecting prism, 11-second optical combiner, 12-focusing lens, 13-receiving optical assembly. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Please refer to Figure 1 A BOX optical device structure for 50G PON includes a flexible board 1, a housing 2 and an optical fiber interface component 8, wherein the optical fiber interface component 8 is connected to one end of the housing 2, and the flexible board 1 is disposed in the housing 2:

[0028] Among them, the flexible board 1 is only a conventional solution for connecting the optoelectronic chip to the PCB. A better solution may adopt a pad solution of a ceramic substrate, which has better electrical performance, and the BOX packaging product has better sealing and is easier to manufacture.

[0029] Several high-speed laser 3 chips and detector chips are connected to the flexible board 1, three lasers 3 are connected to the high-speed laser 3 chip, and the detector chip is connected to the receiving end optical component 13;

[0030] A collimating lens 4 is arranged on one side of the laser 3, an isolator 5 is arranged on the side of the collimating lens 4 away from the laser 3, a first light combiner 6 is arranged on the side of the isolator 5 away from the collimating lens 4, and a filter 7 is arranged on the side of the first light combiner 6 away from the isolator 5;

[0031] A focusing lens 12 is disposed on one side of the detector chip, a second light combiner 11 is disposed on a side of the focusing lens 12 away from the detector chip, and a first deflecting prism 10 is disposed on a side of the second light combiner 11 away from the focusing lens 12;

[0032] The first optical combiner 6 is a Z-BLOCK (MUX), and the second optical combiner 11 is a Z-BLOCK (DEMUX).

[0033] A reflecting prism 9 is arranged on a side of the filter 7 and the first deflecting prism 10 close to the optical fiber interface assembly 8 .

[0034] Specifically, in the optical transmission component, the light source comes from three lasers 3 with different wavelengths, and collimated light transmission is achieved through the coupling of the collimating lens 4. The three collimated light beams of different wavelengths will pass through the isolator 5, and the corresponding channel of the isolator 5 here must match the wavelength of the laser 3. The three collimated light beams are then combined by the first optical combiner 6 and output through a COM port. After being refracted by the filter 7, the collimated light beam is finally focused and coupled into the ceramic ferrule through the external lens. The optical fiber interface assembly 8 includes components such as the external lens and the ferrule sleeve.

[0035] The optical component at the receiving end is usually an external light source (not intersecting with the wavelength range of the transmitting laser 3) that obtains a collimated light beam through a ceramic ferrule and an external lens. After the light beam is reflected by the filter 7 and the reflecting prism 9, the collimated light beam will pass through the first deflection prism 10. At this time, the collimated light beam is deflected in both the horizontal and vertical directions. After the deflected collimated light beam passes through the second optical combiner 11, the beam is demultiplexed into three collimated lights of different wavelengths. The three groups of independent collimated light beams are then coupled and focused into the detector chip after passing through the focusing lens 12 and the second deflection prism.

[0036] In an exemplary embodiment of the present invention, both the incident surface and the exit surface of the collimating lens 4 and the focusing lens 12 are provided with an anti-reflection film.

[0037] The light splitting surfaces of the first light combiner 6 and the second light combiner 11 are provided with film layers, and the light emitting surfaces thereof are provided with anti-reflection films.

[0038] Specifically, the multiplexer in ZB l ock has a film layer on the splitting surface that allows special wavelengths to pass through, and the COM output port is coated with an anti-reflection film. Except for the COM output port area, the other positions of the B l ock beam combination output surface are coated with a high-reflection film. The demultiplexer is consistent with its principle. In order to ensure the requirements of indicators such as isolation between channels and achieve a miniaturized structure, the above ZB l ock adopts a splitting angle of 13.5°.

[0039] The filter 7 is a 20° filter 7. Since the interval between adjacent wavelengths of the transmitting optical component and the receiving optical component 13 is small, considering the actual manufacturing capacity, the filter 7 cannot use a larger angle to separate its adjacent wavelengths.

[0040] The surface of the reflecting prism 9 is provided with a reflecting film.

[0041] The incident and exit surfaces of the prism 10 are coated with anti-reflection films, and the total reflection of the 45° inclined surface is used to deflect the light beam. This prism can also change the height of the receiving end light path through the angle of the inclined surface, so that the receiving and transmitting end pads are in the same plane, which is more conducive to production.

[0042] The receiving optical component 13 includes a base, a second deflecting prism, an avalanche photodiode and a transimpedance amplifier. The avalanche photodiode is connected to the transimpedance amplifier, and the second deflecting prism is arranged on the base.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A BOX optical device structure for 50G PON, characterized in that: The invention comprises a flexible board (1), a housing (2) and an optical fiber interface component (8), wherein the optical fiber interface component (8) is connected to one end of the housing (2), and the flexible board (1) is arranged inside the housing (2): The flexible board (1) is connected to a plurality of high-speed laser (3) chips and detector chips, the high-speed laser (3) chip is connected to three lasers (3), and the detector chip is connected to a receiving optical component (13); A collimating lens (4) is arranged on one side of the laser (3); an isolator (5) is arranged on the side of the collimating lens (4) away from the laser (3); a first light combiner (6) is arranged on the side of the isolator (5) away from the collimating lens (4); and a filter (7) is arranged on the side of the first light combiner (6) away from the isolator (5); A focusing lens (12) is provided on one side of the detector chip, a second light combiner (11) is provided on a side of the focusing lens (12) away from the detector chip, and a first deflecting prism (10) is provided on a side of the second light combiner (11) away from the focusing lens (12); A reflecting prism (9) is arranged on one side of the filter (7) and the first deflecting prism (10) close to the optical fiber interface assembly (8).

2. A BOX optical device structure for 50G PON according to claim 1, characterized in that: The incident surface and the exit surface of the collimating lens (4) and the focusing lens (12) are both provided with anti-reflection films.

3. A BOX optical device structure for 50G PON according to claim 1, characterized in that: The light splitting surfaces of the first light combiner (6) and the second light combiner (11) are provided with film layers, and the light emitting surfaces thereof are provided with anti-reflection films.

4. A BOX optical device structure for 50G PON according to claim 1, characterized in that: The light splitting angles of the first light combiner (6) and the second light combiner (11) are 13.5 degrees.

5. A BOX optical device structure for 50G PON according to claim 1, characterized in that: The angle of the filter (7) is 20 degrees.

6. A BOX optical device structure for 50G PON according to claim 1, characterized in that: The surface of the reflecting prism (9) is provided with a reflecting film.

7. A BOX optical device structure for 50G PON according to claim 1, characterized in that: The incident surface and the exit surface of the first deflecting prism (10) are both provided with anti-reflection films.

8. The BOX optical device structure for 50G PON according to claim 1, characterized in that: The receiving end optical component (13) comprises a base, a second deflecting prism, an avalanche photodiode and a transimpedance amplifier; the avalanche photodiode is connected to the transimpedance amplifier; and the second deflecting prism is arranged on the base.

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