Multi-mode BD optical device for vehicle-mounted radar detection

Abstract

The utility model provides a multimode BD optical device used for vehicle-mounted radar detection, which comprises a shell, a VCSEL laser chip, a TO packaging structure, an optical port, a receiving detector, a converging lens and a 45-degree diaphragm, a mounting hole is arranged in the shell, the mounting hole penetrates through two ends of the shell, the TO packaging structure and the optical port are respectively arranged on two ends of the shell, the mounting hole penetrates through the two ends of the shell, and the receiving detector is arranged on the shell. The VCSEL laser chip is packaged in the TO packaging structure, the convergence lens and the 45-degree diaphragm are installed in the installation hole, the convergence lens is arranged close to the TO packaging structure, and the receiving detector is installed on the side face of the shell and used for receiving light output by the light port and reflected by the 45-degree diaphragm. According to the multimode BD optical device, the VCSEL laser chip and the receiving detector are coaxially packaged to form a one-transmitting and one-receiving multimode structure, tolerance can be adjusted by moving the TO packaging structure through the coupling mode of the TO packaging structure and the converging lens, the coupling efficiency can reach up to 95%, and the coaxially packaged optical device is high in reliability and small in size.

Description

Technical Field

[0001] This utility model belongs to the field of optical communication technology, specifically relating to a multimode BD optical device for vehicle-mounted radar detection. Background Technology

[0002] As autonomous driving technology becomes more sophisticated, LiDAR needs to meet requirements for higher resolution, longer detection range, adaptability to complex environments, and high packaging reliability. Traditional edge-emitting lasers (EELs) have limitations such as large divergence angles and complex packaging. VCSEL lasers, with their vertical emission characteristics, high integration, and wavelength stability, have become the preferred solution for automotive radar light sources.

[0003] Existing multimode VCSEL structures generally adopt a dual-transmit, dual-receive TOSA / ROSA structure, or are packaged in the form of COB. The dual-transmit, dual-receive structure requires dual-fiber bidirectional modulation during module modulation, and many structures do not use this type of optical module structure. In the COB form, all electrical chips / optical chips / passive components are glued to the COB board, which has low reliability and is prone to falling off, posing a risk in use. In addition, the COB process requires the processing of lenses inside the LC optical port, which is quite difficult in terms of process. The coupling of the optical lens and the orientation of the adhesive position have a great impact on the optical path and performance. Utility Model Content

[0004] The purpose of this invention is to provide a multimode BD optical device for vehicle-mounted radar detection, which 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 multimode BD optical device for vehicle-mounted radar detection includes a housing, a VCSEL laser chip, a TO package structure, an optical port, a receiving detector, a converging lens, and a 45° diaphragm. The housing has mounting holes extending through both ends. The TO package structure and the optical port are respectively mounted on the two ends of the mounting holes on the housing. The VCSEL laser chip is packaged within the TO package structure. The converging lens and the 45° diaphragm are mounted within the mounting holes, with the converging lens positioned close to the TO package structure. The receiving detector is mounted on the side of the housing to receive light output from the optical port and reflected by the 45° diaphragm.

[0007] Furthermore, the TO packaging structure adopts a TO46 package, including a TO socket and a TO cap, wherein the TO cap is a flat-window cap, and the converging lens is fitted and arranged with the flat-window cap.

[0008] Furthermore, the TO packaging structure also includes an MPD device, which is mounted inside the TO socket, and the VCSEL laser chip is mounted on the MPD device.

[0009] Furthermore, the end of the housing on which the TO packaging structure is mounted is provided with a mounting groove, and the TO tube cap extends at least partially into the mounting groove.

[0010] Furthermore, the sidewall of the mounting groove is bonded and fixed to the sidewall of the TO tube cap.

[0011] Furthermore, the 45° diaphragm operates at a wavelength of 965~990 nm, has an insertion loss (IL) of less than 0.3 dB, and an isolation (ISO) of greater than 40 dB.

[0012] Furthermore, a 0° diaphragm is provided in the optical path between the 45° diaphragm and the receiving detector.

[0013] Furthermore, the 0° diaphragm operates at a wavelength of 844~858nm, has an insertion loss IL of less than 0.3dB, and an isolation ISO of greater than 40dB.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] The multimode BD optical device provided by this utility model adopts coaxial packaging of VCSEL laser chip and receiving detector to form a multimode structure with one transmitter and one receiver. Furthermore, the coupling method between the TO package structure and the converging lens can be adjusted by moving the TO package structure to achieve a coupling efficiency of up to 95%. The coaxial packaged optical device has high reliability and small size, effectively solving the problems of low coupling efficiency, long device length, and low reliability caused by traditional VCSEL lasers packaged in COB form or dual-fiber bidirectional TOSA / ROSA.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the multimode BD optical device for vehicle-mounted radar detection according to this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the multimode BD optical device for vehicle-mounted radar detection according to this utility model;

[0019] Figure 3 This is a schematic diagram of the emission optical path of the VCSEL laser chip in the multimode BD optical device for vehicle radar detection according to this utility model;

[0020] Figure 4This is a schematic diagram of the receiving optical path of the receiver detector in the multimode BD optical device for vehicle-mounted radar detection according to this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Housing; 2. TO package structure; 3. Receiver detector; 4. Optical port; 5. TO tube socket; 6. TO tube cap; 7. Mounting groove; 8. Converging lens; 9. 0° diaphragm; 10. 45° diaphragm. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this embodiment provides a multimode BD optical device for vehicle-mounted radar detection, including a housing 1, a VCSEL laser chip (not shown), a TO package structure 2, an optical port 4, a receiving detector 3, a converging lens 8, and a 45° diaphragm 10. The housing 1 integrates three ports: an optical port, a laser emitter, and a detector. The housing 1 has mounting holes that penetrate the optical port and laser emitter. The VCSEL laser chip is packaged in the TO package structure 2. The converging lens 8 and the 45° diaphragm 10 are mounted within the mounting holes, with the converging lens 8 positioned close to the TO package structure 2. The light emitted by the VCSEL laser chip within the TO package structure 2 is sequentially converted into focused light by the converging lens 8 and transmitted through the 45° diaphragm 10 before being input to the optical port 4. The receiving detector 3 is mounted on the detector side of the housing 1 and is used to receive light output from the optical port 4 and reflected by the 45° diaphragm 10. The multimode BD optical device provided in this embodiment uses coaxial packaging of the VCSEL laser chip and the receiving detector to form a multimode structure with one transmitter and one receiver. The coupling method between the TO package structure 2 and the converging lens 8 can be adjusted by moving the TO package structure 2 to improve the coupling efficiency. At the same time, the coaxial packaged optical device has high reliability and small size, effectively solving the problems of low coupling efficiency, long device length, and low reliability caused by traditional VCSEL lasers packaged in COB form or dual-fiber bidirectional TOSA / ROSA.

[0027] In some embodiments, the housing 1 is designed to be generally cuboid in shape. The cuboid requires a dimensional tolerance of ±0.05mm and requires local areas to be cleaned, deburred, and flattened to facilitate welding and bonding of passive components and to better adapt to the module structure.

[0028] In existing conventional one-transmit-one-receive or multiple-transmit-multiple-receive optical device structures, the transmitter typically uses TO56 or TO60 packaging. However, in this embodiment, the transmitter laser uses a VCSEL laser chip, which is a surface-emitting laser. If conventional TO56 or TO60 packaging is used, the spacer will be too high, posing a risk in wire bonding, and there will be no backlight monitoring, which is not conducive to the online monitoring of the multimode optical module. Therefore, this embodiment preferably designs the TO packaging structure 2 to use TO46 packaging, specifically including TO socket 5 and TO cap 6. Since the TO46 package typically uses a ball lens or flat window cap, the backlight current of the ball lens cap is only 40~100uA, which is not suitable for the online monitoring of the module. Therefore, in this embodiment, the TO cap 6 is designed as a flat window cap. The backlight size can be adjusted according to the transmit and receive ratio of the flat window cap. Preferably, the ratio of transmitted to reflected light in the flat window cap is 7:3. This can ensure both the optical power of the transmitter and the backlight requirements for module debugging, thus making it better suited for vehicle-mounted detection. Meanwhile, the converging lens 8 is placed on the outside of the flat window cap and is arranged in close contact with the flat window cap. This design of using an external lens at the transmitter end greatly improves the coupling efficiency, which can reach up to 95%.

[0029] Furthermore, the TO package structure 2 also includes an MPD device (not shown in the figure) for backlight monitoring of the VCSEL laser chip. The MPD device is installed inside the TO socket 5, and the VCSEL laser chip is installed on the MPD device.

[0030] In an optional embodiment, the end of the housing 1 where the TO packaging structure 2 is mounted is provided with a mounting groove 7, and the TO cap 6 extends at least partially into the mounting groove 7. The sidewall of the mounting groove 7 is bonded and fixed to the sidewall of the TO cap 6. In this embodiment, the transmitter (i.e., the TO packaging structure) is connected to the housing 1 by adhesive bonding. On the one hand, the coupling method between the TO cap 6 and the converging lens 8 can be adjusted by moving the TO packaging structure 2 to ensure the performance of online modulation of the optical device. On the other hand, it can effectively avoid the problem of risky and loose connection between the traditional laser welding sealing tube and the TO46 cap, ensuring the reliability of the connection between the transmitter and the housing 1.

[0031] To adapt to the vehicle-mounted detection environment, the 45° diaphragm 10 is designed to operate at a wavelength of 965~990 nm. A 0° diaphragm 9 is provided in the optical path between the 45° diaphragm 10 and the receiving detector 3, and the operating wavelength of the 0° diaphragm 9 is 844~858 nm. Specifically, the wavelength of the emitting laser is 980 nm, and the wavelength of the receiving detector is 850 nm, which can be applied to vehicle-mounted environments of -40~125℃.

[0032] The optimized design ensures that the insertion loss IL of the 45° diaphragm 10 and the 0° diaphragm 9 is less than 0.3dB and the isolation ISO is greater than 40dB, thus guaranteeing the crosstalk and isolation of the optical device.

[0033] 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 invention.

Claims

1. A multimode BD optical device for vehicular radar detection, characterized by: The device includes a housing, a VCSEL laser chip, a TO package structure, an optical port, a receiving detector, a converging lens, and a 45° diaphragm. The housing has mounting holes that extend through both ends of the housing. The TO package structure and the optical port are respectively mounted on the two ends of the mounting holes on the housing. The VCSEL laser chip is packaged in the TO package structure. The converging lens and the 45° diaphragm are mounted in the mounting holes, with the converging lens arranged close to the TO package structure. The receiving detector is mounted on the side of the housing to receive light output from the optical port and reflected by the 45° diaphragm.

2. The multimode BD optical device for vehicular radar detection of claim 1, wherein: The TO package structure adopts a TO46 package, including a TO socket and a TO cap. The TO cap is a flat-window cap, and the converging lens is attached to the flat-window cap.

3. The multimode BD optical device for vehicular radar detection of claim 2, wherein: The TO package structure also includes an MPD device, which is mounted inside the TO socket, and the VCSEL laser chip is mounted on the MPD device.

4. The multimode BD optical device for vehicular radar detection of claim 2, wherein: The housing has a mounting groove at one end where the TO packaging structure is mounted, and the TO tube cap extends at least partially into the mounting groove.

5. The multimode BD optical device for vehicular radar detection of claim 4, wherein: The sidewall of the mounting groove is bonded and fixed to the sidewall of the TO cap.

6. The multimode BD optical device for vehicular radar detection of claim 1, wherein: The 45° diaphragm operates at a wavelength of 965~990 nm, with an insertion loss (IL) of less than 0.3 dB and an isolation (ISO) of greater than 40 dB.

7. The multimode BD optical device for vehicular radar detection of claim 1, wherein: A 0° diaphragm is provided in the optical path between the 45° diaphragm and the receiving detector.

8. The multimode BD optical device for vehicular radar detection of claim 7, wherein: The 0° diaphragm operates at a wavelength of 844~858nm, with an insertion loss (IL) of less than 0.3dB and an isolation (ISO) of greater than 40dB.

Images