Manufacturing method of printed circuit boards with optical waveguide couplers

Abstract

A manufacturing method of printed circuit boards with optical waveguide couplers includes the steps of (1) manufacturing a substrate; (2) manufacturing an optical waveguide layer which is composed of a bottom coating graph, a core graph and a top coating graph; (3) manufacturing an optical waveguide reflector by coating an upper reflector on a core bevel to form a micro-mirror; (4) manufacturing the corresponding printed circuit board; (5) subjecting the printed circuit board and the substrate which is of the optical waveguide layer to the process of press fit so as to form a mixture board with the optical waveguide layer and a copper circuit layer; and (6) etching and milling to form the final optical channel. Since the graphs of the optical waveguide layer are exposed by means of gray masks and windows of the upper coating are coated with the reflector, a micro-mirror coupler is formed, and further is formed integrally with the optical waveguide couplers. The core graph comprises a core circuit and the core bevel, and the core bevel is exposed by means of gray mask. The manufacturing method has the advantages that coupling loss is low, manufacturing of the l micro-mirror is easy to achieved, and embedding density of the couplers in a light guide plate is increased.

Description

technical field [0001] The invention relates to the technical field of printed circuits, in particular to a method for manufacturing a printed circuit board containing an optical waveguide coupling device. Background technique [0002] With the development of information science and technology such as communication and computer technology, the traditional electrical interconnection of PCB copper wires will face severe challenges due to inherent problems such as LC delay and crosstalk. The industry generally believes that when the single-channel rate is above 10G, the electrical interconnection Even the technical implementation and cost will face severe challenges, requiring a new interconnection method. Optical interconnects have the distinct advantage of replacing electrical interconnects, being easier to implement and maintaining good signal integrity. The advantages of optical interconnects include: [0003] 1. The transmission loss on the optical channel is mainly dete...

AI Technical Summary

Problems solved by technology

[0013] In the method of externally making a 45-degree micromirror and embedding it into the board, since the coupling device and the optical waveguide as the optical transmission channel are two independent parts, the process of embedding the device in the board is difficult, and the alignment accuracy is poor. The introduction of additional coupling loss is not conducive to signal transmission; and due to the limitation of the 45-degree micromirror manufacturing process, the height of the micromirror can only reach a minimum of 200um, which affects the embedding density of coupling devices

[0014] However, the surface roughness of the micromirror made by diamond / laser cutting is large, and the process of making the micromirror with a 45-degree mold is complicated and difficult to achieve mass production

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