Low-cost high-reliability BOX optical device

Abstract

The utility model relates to a kind of low-cost high reliability BOX optical device, the one end of sapphire seat enters the hole in the side wall of BOX shell and is sealedly connected with BOX shell, LC adapter is fixed with sapphire seat in the mode of laser welding, laser welding spot between LC adapter and sapphire seat is covered with epoxy glue, sapphire light window coupled with LC adapter is laid in the optical channel of sapphire seat, a mirror image arrangement Z-blcok component is fixed in BOX shell, a light isolator and a converging lens are sequentially coupled between the light outlet of Z-blcok component and sapphire light window in BOX shell, multiple light emitting ends coupled with each light inlet of Z-blcok component are laid in BOX shell respectively. Advantageous effect is: high reliability, cost reduction, laser welding spot is covered with epoxy glue, avoid rust, protect the end face of LC adapter and sapphire light window in dustproof waterproof space.

Description

Technical Field

[0001] This utility model relates to the field of optical device technology, specifically to a low-cost, high-reliability BOX optical device. Background Technology

[0002] Box-type optical devices are an important form of packaging, and their structure is as follows: Figure 1 The diagram shows the BOX casing and the LC adapter, adjustment ring, lens sleeve, sapphire mount, and optical isolator located outside the BOX casing. A sapphire window is positioned within the optical channel of the sapphire mount, with gold plating around its perimeter (except for the central light-transmitting area). The gold-plated area of ​​the sapphire window is then soldered to the sapphire mount using gold-tin solder. The sapphire mount is made of Kovar alloy. One end of the sapphire mount enters a hole in the side wall of the BOX casing. The sapphire mount is then brazed to the BOX casing for a secure seal. The LC adapter, adjustment ring, lens sleeve, and sapphire mount are arranged sequentially. The lens sleeve is fixed to the outside of the sapphire mount, and the LC adapter is fixed to the outside of the lens sleeve via the adjustment ring. A converging lens coupled to the LC adapter is fixed inside the lens sleeve. An optical isolator is coupled between the converging lens and the LC adapter within the adjustment ring. The BOX housing contains a prism that couples between the sapphire window and the Z-blcok component to elevate the emitted light from the Z-blcok component to a predetermined height so that it enters the sapphire window. An adjustment ring and lens sleeve are fixed together by laser welding, as are the lens sleeve and the sapphire base. Multiple light-emitting terminals, each coupled to an inlet of the Z-blcok component, are arranged inside the BOX housing. A cooler, a TEC cooler, is fixed inside the BOX housing. There are four light-emitting terminals. Each light-emitting terminal includes a laser chip, a collimating lens, and a heat sink. The laser chip is located on the heat sink, and the collimating lens is coupled between the laser chip and the inlet of the Z-blcok component. The heat sink is made of ceramic.

[0003] This type of BOX optical device has a large number of components, resulting in more welding points, relatively complex processes, relatively slow coupling speed during packaging, and relatively poor optical path reliability. The LC adapter coupling welding is difficult because the LC adapter, adjustment ring, lens sleeve, and sapphire base are couplings between multiple components, that is, the relative positions of multiple components are arranged in a "U" shape to find optical coupling. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a low-cost, high-reliability BOX optical device to overcome the shortcomings of the prior art.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A low-cost, high-reliability BOX optical device includes: a BOX housing, an LC adapter and a sapphire mount located outside the BOX housing. One end of the sapphire mount enters a hole in the side wall of the BOX housing and is sealed to the BOX housing. The LC adapter and the sapphire mount are fixed together by laser welding. The laser weld joint between the LC adapter and the sapphire mount is covered with epoxy resin. A sapphire window coupled to the LC adapter is arranged in the optical channel of the sapphire mount. A mirror-arranged Z-blcok component is fixed inside the BOX housing. An optical isolator and a converging lens are sequentially coupled along the light propagation direction between the light output port of the Z-blcok component and the sapphire window inside the BOX housing. Multiple light emitting terminals coupled to the light input ports of the Z-blcok component are arranged inside the BOX housing.

[0006] The beneficial effects of this utility model are: This solution only requires soldering the LC adapter to the sapphire mount; no other soldering is needed, significantly improving soldering reliability. Since the converging lens is located inside the BOX housing, which provides an airtight environment, reliability is even higher. Existing technologies involve coupling between the adjustment ring and the converging lens, resulting in a length tolerance of ±0.5mm. In this solution, the LC adapter and sapphire mount are directly pressed together, achieving a length tolerance of ±0.05mm. This solution reduces the need for the adjustment ring, lens sleeve, and prism, shortening the overall length by 3.3mm. This allows for more space in the PCB layout (FPC pads have better bending tolerance and are less prone to breakage), while also reducing costs. The laser solder joints are covered with epoxy adhesive to prevent rust and create a near-airtight space, protecting the LC adapter's end face and the sapphire window from dust and water.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the light emitting end includes a laser chip, a collimating lens, and a heat sink. The laser chip is located on the heat sink, and the collimating lens is coupled between the laser chip and the light inlet of the Z-blcok component.

[0009] Furthermore, the heat sink is made of ceramic.

[0010] Furthermore, the number of optical transmitters is four.

[0011] Furthermore, a cooler is fixed inside the BOX casing, and the light emitting end is fixed on the cooler.

[0012] The further beneficial effect of adopting the above is that the cooler can dissipate heat from the light emitting end to avoid the light emitting end from getting too hot during operation.

[0013] Furthermore, the refrigeration unit adopts a TEC refrigeration unit.

[0014] Furthermore, the sapphire base is fixed and sealed to the BOX casing by brazing.

[0015] Furthermore, the sapphire crystal is made of Kovar alloy. Attached Figure Description

[0016] Figure 1 This is a structural diagram of a BOX optical device in the prior art; Figure 2 This is a structural diagram of the low-cost, high-reliability BOX optical device of this utility model; Figure 3 This is a coupling flowchart of the low-cost, high-reliability BOX optical device of this utility model.

[0017] The attached diagram lists the components represented by each number as follows: 1. Box casing, 2. LC adapter, 3. Sapphire mount, 4. Epoxy resin, 5. Sapphire light window, 6. Z-blcok assembly, 7. Optical isolator, 8. Converging lens, 9. Light emitter, 910. Laser chip, 920. Collimating lens, 930. Heat sink, 10. Cooler. Detailed Implementation

[0018] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0019] Example 1 like Figure 2 As shown, a low-cost, high-reliability BOX optical device includes: The BOX housing 1, LC adapter 2, and sapphire mount 3 are all located outside the BOX housing 1. A hole is made in the side wall of the BOX housing 1. One end of the sapphire mount 3 enters the hole in the side wall of the BOX housing 1 and is sealed to it. The LC adapter 2 and sapphire mount 3 are fixed together by laser welding. The laser weld joint between the LC adapter 2 and the sapphire mount 3 is covered with epoxy adhesive 4. A sapphire optical window 5 coupled to the LC adapter 2 is arranged in the optical channel of the sapphire mount 3. The laser weld joint is covered with epoxy adhesive 4 to prevent rusting and to create a near-airtight space, protecting the end face of the LC adapter 2 and the sapphire optical window 5 from dust and water. Inside the BOX housing 1... A Z-blcok component 6 is fixed in a mirror arrangement. Inside the BOX housing 1, between the light outlet of the Z-blcok component 6 and the sapphire window 5, a light isolator 7 and a converging lens 8 are sequentially coupled along the light propagation direction at an angle of 7°. The 7° angle of the light isolator 7 eliminates the need for a light path shift prism. Multiple light emitting ends 9 are arranged inside the BOX housing 1 and are coupled to each light inlet of the Z-blcok component 6. The light beams emitted by the multiple light emitting ends 9 are coupled into the Z-blcok component 6 through each light inlet, then merged into one beam, and coupled into the light isolator 7 through the light outlet. After passing through the light isolator 7, the converging lens 8, and the sapphire window 5 in sequence, the beams are coupled into the LC adapter 2.

[0020] like Figure 3 As shown, the coupling steps of the low-cost, high-reliability BOX optical device are as follows: S10. The optical isolator 7, Z-blcok assembly 6, and laser chip 910 in the optical emitter 9 are coupled and fixed inside the BOX housing 1. Then the LC adapter 2 approaches the end face of the sapphire base 3 and makes contact. S20, LC adapter 2 is coupled to the sapphire optical window 5 in the sapphire base 3, so that the optical power of the laser chip 910 in each optical emitter 9 is maximized. In this way, the optical path of LC adapter 2 is aligned with the center. Then, laser welding is performed to fix LC adapter 2 on the sapphire base 3. S30. Epoxy adhesive is used to protect the laser welding points. The epoxy adhesive is selected for UV + heat dual curing. UV curing can quickly dry the adhesive and prevent the adhesive from flowing and contaminating the end face of LC adapter 2. Finally, the adhesive is cured by heat. S40, coupling converging lens 8, the converging lens 8 and LC adapter 2 have a fixed focal length, keeping the focal length unchanged, coupled to the maximum, and are fixed with UV glue; S50, respectively, coupled the collimating lens 920 in each optical emitter 9, so that the optical power of the laser chip 910 is within the required range.

[0021] In this solution, only the LC adapter 2 needs to be soldered to the sapphire base 3, and no other soldering is required, which greatly improves the reliability of the soldering. Since the converging lens 8 is located inside the BOX shell 1, and the BOX shell 1 is an airtight environment, the reliability is even higher. In the existing technology, due to the coupling of the adjustment ring and the converging lens, the length tolerance is ±0.5mm. In this solution, the LC adapter 2 and the sapphire base 3 are in direct contact and pressed together, and the length tolerance is ±0.05mm. This solution reduces the three materials of adjustment ring, lens sleeve and prism, so that the overall length can be shortened by 3.3mm (10.45mm-7.15mm=3.3mm), which leaves more space for PCB layout (FPC soft pad has better bending tolerance and is not easy to bend and break), while reducing costs.

[0022] Example 2 like Figure 2 As shown, this embodiment is a further improvement on embodiment 1, as detailed below: The light emitting end 9 includes a laser chip 910, a collimating lens 920, and a heat sink 930. The laser chip 910 is located on the heat sink 930. The collimating lens 920 is coupled between the laser chip 910 and the light inlet of the Z-blcok component 6. The light emitted by the laser chip 910 is coupled into the Z-blcok component 6 after passing through the collimating lens 920.

[0023] The heat sink 930 is preferably made of ceramic, and the number of light emitting ends 9 is four, which is consistent with the existing technology.

[0024] Example 3 like Figure 2 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below: A cooler 10 is fixed inside the BOX housing 1, and the light emitting end 9 is fixed on the cooler 10. The cooler 10 can dissipate heat from the light emitting end 9 to avoid the light emitting end 9 from getting too hot during operation. In this embodiment, the cooler 10 is preferably a TEC cooler.

[0025] The sapphire base 3 is fixed and sealed to the BOX shell 1 by brazing. The sapphire base 3 is made of Kovar alloy.

[0026] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A low-cost, high-reliability BOX optical device, characterized in that, include: The BOX housing (1) includes an LC adapter (2) and a sapphire mount (3) located outside the BOX housing (1). One end of the sapphire mount (3) enters a hole on the side wall of the BOX housing (1) and is sealed to the BOX housing (1). The LC adapter (2) and the sapphire mount (3) are fixed together by laser welding. The laser weld joint between the LC adapter (2) and the sapphire mount (3) is covered with epoxy glue (4). The optical channel of the sapphire mount (3) is arranged with the LC adapter. (2) A sapphire window (5) coupled together, a mirror-arranged Z-blcok component (6) is fixed inside the BOX housing (1), and a light isolator (7) and a converging lens (8) are sequentially coupled between the light outlet of the Z-blcok component (6) and the sapphire window (5) along the light propagation direction inside the BOX housing (1). Multiple light emitting ends (9) are arranged inside the BOX housing (1) and coupled to each light inlet of the Z-blcok component (6).

2. The low-cost, high-reliability BOX optical device according to claim 1, characterized in that, The light emitting end (9) includes a laser chip (910), a collimating lens (920) and a heat sink (930). The laser chip (910) is located on the heat sink (930), and the collimating lens (920) is coupled between the laser chip (910) and the light inlet of the Z-blcok component (6).

3. The low-cost, high-reliability BOX optical device according to claim 2, characterized in that, The heat sink (930) is made of ceramic.

4. The low-cost, high-reliability BOX optical device according to claim 1, characterized in that, The number of optical transmitters (9) is four.

5. A low-cost, high-reliability BOX optical device according to any one of claims 1 to 4, characterized in that, A cooler (10) is fixed inside the BOX shell (1), and the light emitting end (9) is fixed on the cooler (10).

6. A low-cost, high-reliability BOX optical device according to claim 5, characterized in that, The refrigerator (10) is a TEC refrigerator.

7. A low-cost, high-reliability BOX optical device according to claim 1, characterized in that, The sapphire base (3) and the BOX shell (1) are fixed and sealed by brazing.

8. A low-cost, high-reliability BOX optical device according to claim 7, characterized in that, The sapphire base (3) is made of Kovar alloy.

Images