Balanced photoelectric detector binary array optical fiber coupling structure and manufacturing method

Abstract

The invention belongs to the technical field of semiconductor packaging, and relates to a binary array optical fiber coupling structure of a balanced photoelectric detector and a manufacturing method, and the coupling structure adopts a lead-tin welding technology to weld a binary array optical fiber in a metal tube shell; the metal tube shell comprises a metal sleeve and a metal cavity, and the metal sleeve is embedded in the wall of the metal cavity in a penetrating mode. The binary array optical fiber comprises two optical fibers, a metal nickel tube, a sleeve and two optical fiber connectors, the two optical fibers are jointly fixed in the metal nickel tube by adopting a gold-tin welding process, one ends of the two optical fibers are exposed out of the metal nickel tube, the other ends of the two optical fibers are respectively connected with the optical fiber connectors, and the sleeve wraps the two optical fibers and is connected with the metal nickel tube; the binary array optical fiber is fixed in the metal sleeve, and the metalized end of the binary array optical fiber is coaxially aligned with the photosensitive surface of the chip in the metal cavity; according to the invention, double-fiber coupling can be realized at one time, and the coupling process difficulty is reduced; the coupling packaging size can be reduced, and miniaturization packaging of the photoelectric detection module can be balanced.

Description

technical field [0001] The invention belongs to the technical field of semiconductor packaging, and relates to a balanced photodetector binary array fiber coupling structure and a manufacturing method. Background technique [0002] With the application of information coherent laser communication technology in optical communication, the balanced photodetector, one of the core components of the receiving end, is required to have the characteristics of high bandwidth, high common-mode rejection ratio and integrated miniaturization. [0003] The existing balanced photodetectors mainly use two independent optical fibers of the same length for coupling respectively, such as figure 1 shown. However, in practical applications, the above coupling structure has the following problems: [0004] 1. Independent coupling of two optical fibers makes the coupling process operation difficult; [0005] 2. The size of the coupling part is large, which is not conducive to the further miniatu...

AI Technical Summary

Problems solved by technology

[0004] 1. Independent coupling of two optical fibers makes the coupling process operation difficult;

[0005] 2. The size of the coupling part is large, which is not conducive to the further miniaturization and integration of the balanced photodetection module;

[0006] 3. The distance between the two optical fibers is large, which makes the distance between the chip units in the balanced photoelectric detection module large, which is not conducive to the improvement of the bandwidth performance of the balanced photoelectric detection module;

[0007] 4. The inconsistency of the length of the two optical fibers will degrade the common mode rejection ratio parameter of the balanced photodetection module

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