Pluggable optical receiver detector assembly

Abstract

This utility model discloses a pluggable optical receiver detector assembly, characterized in that it includes an optical receiver detector, a metal tube, an adjusting collar, and a metal ferrule assembly, wherein: the metal tube is sleeved on the optical receiver detector, and the two are fixedly connected; the adjusting collar, after one alignment, has one end sleeved on the metal ferrule assembly, and after a second alignment, its other end is fixedly connected to the metal tube. This utility model achieves precise adjustable coupling by setting a metal tube and an adjusting collar between the optical receiver detector and the metal ferrule assembly, and by connecting the adjusting collar to both the metal tube and the metal ferrule assembly after two alignments.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, and in particular to a pluggable optical receiver detector assembly. Background Technology

[0002] Small photosensitive surface chips are the core path for achieving high bandwidth and low latency in high-speed detectors. This places high demands on the overall structure, and stainless steel is used in conjunction with other materials to ensure product durability and shielding effectiveness. Due to their tiny photosensitive area, small photosensitive surface photodetectors face unique challenges in optical coupling, primarily in the difficulty of core coupling. High-precision alignment requires a smaller photosensitive surface; however, even slight offsets (±1μm) or angular deviations (±0.5°) in the fiber or lens after the photosensitive surface is reduced can cause the light spot to deviate from the photosensitive area, resulting in significant signal attenuation. Traditional optical receiver detectors and metal ferrule assemblies are directly coupled by UV adhesive bonding. Because the optical receiver detector and metal ferrule assembly are separate units, direct bonding cannot be fine-tuned, failing to meet accuracy requirements. Therefore, a high-precision coupling platform is needed to achieve micron-level dynamic adjustment during coupling welding. Utility Model Content

[0003] The main purpose of this invention is to provide a pluggable optical receiver detector assembly that can achieve precise adjustable coupling.

[0004] The technical solution adopted in this utility model is:

[0005] A pluggable optical receiver detector assembly is provided, comprising an optical receiver detector, a metal tube, an adjustment collar, and a metal ferrule assembly, wherein:

[0006] The metal tube is fitted onto the optical receiver detector, and the two are fixedly connected.

[0007] After the first alignment, one end of the adjusting collar is fitted onto the metal insert assembly, and after the second alignment, the other end is fixedly connected to the metal tube body.

[0008] Following the above technical solution, the optical receiving detector is an hermetically sealed detector.

[0009] According to the above technical solution, the optical receiver detector includes a tube base and a lens cap, which together form an airtight cavity; multiple components are installed inside the cavity.

[0010] According to the above technical solution, multiple components include a carrier, an avalanche photodiode, a transimpedance amplifier, and a capacitor. The carrier is fixed on the socket, and both the avalanche photodiode and the transimpedance amplifier are mounted on the carrier and connected by gold wire bonding or flip-chip bonding. One end of the capacitor is connected to the power supply pin of the avalanche photodiode or the transimpedance amplifier, and the other end is connected to the socket.

[0011] Following the above technical solution, the optical center of the lens cap is aligned with the photosensitive surface of the avalanche photodiode.

[0012] Following the above technical solution, the metal tube is fitted onto the lens cap and tightly fitted with adhesive.

[0013] Following the above technical solution, the adjusting collar is fixed to the metal ferrule assembly by welding.

[0014] Following the above technical solution, the adjusting collar is fixed to the metal tube body by welding.

[0015] The beneficial effects of this utility model are as follows: by setting a metal tube and an adjusting collar between the optical receiver detector and the metal ferrule assembly, and by aligning the adjusting collar twice and connecting it to the metal tube and the metal ferrule assembly respectively, a precise adjustable coupling can be achieved.

[0016] Furthermore, the adjusting collar is fixed to the metal ferrule assembly by welding, and the two are finely rotated as a whole under the control of an external precision adjustment device. This allows the signal from the external optical fiber to be better coupled into the optical receiver detector. That is, after alignment, it is fixed to the metal tube by welding, which can better achieve welding in the optimal state of micron-level adjustable coupling and better ensure the stability of the optical path.

[0017] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0019] Figure 1 This is an exploded view of the pluggable optical receiver detector assembly according to an embodiment of the present invention;

[0020] Figure 2 This is an assembly diagram of the pluggable optical receiver detector assembly according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] like Figure 1As shown, the pluggable optical receiver detector assembly of this utility model embodiment includes an optical receiver detector 10, a metal tube 20, an adjusting collar 30, and a metal ferrule assembly 40.

[0023] The metal tube 20 is fitted onto the optical receiver detector 10, and the two are fixedly connected. After the adjustment collar 30 is aligned once, one end of it is fitted onto the metal ferrule assembly 40, and after the second alignment, the other end of it is fixedly connected to the metal tube 20.

[0024] In this embodiment of the invention, the optical receiver detector 10 includes a base 11 and a lens cap 12. The base 11 serves as the mechanical support and electrical connection base for the optical receiver detector 10, and is typically made of metal or ceramic material to ensure airtightness and provide a stable heat conduction path. The base 11 and the lens cap 12 together form an airtight cavity, and multiple components 13 are housed within the cavity. The lens cap 12 and the edge of the base 11 can be laser-sealed to form an airtight cavity. The lens cap 12 integrates an optical lens, focusing the incident light onto the effective region of the avalanche photodiode, and is simultaneously sealed and welded to the base. It is filled with an inert gas (such as N2) to protect the environment and prevent component oxidation or contamination.

[0025] Specifically, the system includes multiple components such as a carrier, an avalanche photodiode, a transimpedance amplifier, and a capacitor. The carrier is fixed to the socket 11, and both the avalanche photodiode and the transimpedance amplifier are mounted on the carrier, connected by gold wire bonding or flip-chip bonding. One end of the capacitor is connected to the power supply pin of the avalanche photodiode or the transimpedance amplifier, and the other end is connected to the socket 11. The carrier is fixed to the center of the socket 11 by eutectic bonding (such as Au-Sn solder) or conductive adhesive, mainly for precisely fixing the avalanche photodiode and the transimpedance amplifier. It is usually made of ceramic or silicon material and needs to have good thermal matching to reduce thermal stress, while optimizing the high-frequency signal transmission path. The avalanche photodiode is the core photosensitive element, which uses the avalanche multiplication effect to convert weak light signals into electrical signals. It has high sensitivity (especially under low light conditions) and needs to work with reverse bias. The transimpedance amplifier converts the weak current signal output from the avalanche photodiode into a voltage signal and amplifies it. Its low-noise design is crucial for improving the detector's signal-to-noise ratio (SNR). Transimpedance amplifiers are typically positioned close to avalanche photodiodes on a carrier or socket to shorten interconnect paths and reduce parasitic inductance. Capacitors are used to filter power supply noise, stabilize the operating voltage of the avalanche photodiode and transimpedance amplifier, and prevent high-frequency oscillations.

[0026] It should be further explained that the optical center of the lens cap 12 must be strictly aligned with the photosensitive surface of the avalanche photodiode. After the incident light is focused by the lens, it accurately illuminates the effective area of ​​the avalanche photodiode (typical spot diameter of tens of micrometers).

[0027] The metal tube 20 is fitted onto the lens cap 12 of the photodetector 10 for a tight fit. During fitting, a ring of UV adhesive is first applied to the outer edge of the lens cap 12, then the metal tube 20 is fitted onto the lens cap 12. The metal tube 20 is gently rotated to evenly coat the inner side with adhesive, creating a tight fit. It is then baked at 110°C for fixation. This fitting method allows the metal ferrule assembly 40 to achieve better micron-level coupling during high-precision coupling using the adjusting collar 30, enabling optimal welding and better ensuring the stability of the optical path.

[0028] Furthermore, the adjusting collar 30 is fixed to the metal insert assembly 40 and the metal tube body 20 by welding.

[0029] The main assembly steps of the pluggable optical receiver detector assembly of this utility model are as follows:

[0030] Step 1: Apply adhesive to the inside of the metal tube 20 and bond it to the optical receiver detector 10;

[0031] Step 2: Adjust the inner diameter of the collar 30 to be slightly larger than the outer diameter of the metal ferrule assembly 40. After the first light search, align the two and then weld them together.

[0032] Step 3: Second coupling and light seeking. Coupling and alignment are performed by rotating the adjusting collar 30. Then, the adjusting collar 30 is welded to the metal tube 20 to obtain the desired result. Figure 2 The pluggable optical receiver detector assembly shown.

[0033] Specifically, firstly, the upper part of the metal ferrule assembly 40 is fixed by the upper clamp of the coupling machine. The upper clamp is equipped with an optical interface for connecting the optical fiber to the metal ferrule assembly 40, forming an optical path for transmission. After the optical receiver detector 10 is bonded to the metal tube 20, the optical receiver detector 20 in the lower clamp of the coupling machine is slidably combined with the metal ferrule of the metal ferrule assembly 40 using the adjusting collar 30. Then, the X, Y, and Z axes of the optical axis are precisely controlled by the coupling machine program to achieve more flexible optical path alignment between the components. The responsivity is monitored in real time during the coupling process to ensure that the laser welding is performed under the best signal transmission condition. The upper part of the adjusting collar 30 is penetrated and fixed to the metal ferrule assembly 40. Multiple solder points are set in the upper and lower rows, such as a total of 12 solder points. After secondary fine coupling to ensure that the signal transmission is under the best condition, the lower part is overlapped and welded (multiple solder points, such as 9 solder points). Finally, the efficient and stable combination of the optical receiver and the optical interface is achieved.

[0034] In summary, this invention achieves precise adjustable coupling by setting a metal tube and an adjusting collar between the optical receiver detector and the metal ferrule assembly, and by aligning the adjusting collar twice and connecting it to the metal tube and the metal ferrule assembly respectively.

[0035] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A pluggable optical receiver detector assembly, characterized in that, It includes a light receiver detector, a metal tube, an adjustment collar, and a metal ferrule assembly, wherein: The metal tube is fitted onto the optical receiver detector, and the two are fixedly connected. After the first alignment, one end of the adjusting collar is fitted onto the metal insert assembly, and after the second alignment, the other end is fixedly connected to the metal tube body.

2. The pluggable optical receiver detector assembly according to claim 1, characterized in that, The optical receiver detector is a hermetically sealed detector.

3. The pluggable optical receiver detector assembly according to claim 1, characterized in that, The optical receiver detector includes a tube base and a lens cap, which together form an airtight cavity; multiple components are housed inside the cavity.

4. The pluggable optical receiver detector assembly according to claim 1, characterized in that, The components include a carrier, an avalanche photodiode, a transimpedance amplifier, and a capacitor. The carrier is fixed on the socket, and the avalanche photodiode and the transimpedance amplifier are both mounted on the carrier and connected by gold wire bonding or flip-chip bonding. One end of the capacitor is connected to the power supply pin of the avalanche photodiode or the transimpedance amplifier, and the other end is connected to the socket.

5. The pluggable optical receiver detector assembly according to claim 4, characterized in that, The optical center of the lens cap is aligned with the photosensitive surface of the avalanche photodiode.

6. The pluggable optical receiver detector assembly according to claim 3, characterized in that, The metal tube is fitted onto the lens cap and tightly sealed with a colloid.

7. The pluggable optical receiver detector assembly according to claim 1, characterized in that, The adjusting collar is fixed to the metal ferrule assembly by welding.

8. The pluggable optical receiver detector assembly according to claim 1, characterized in that, The adjusting collar is fixed to the metal tube body by welding.

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