A kind of optical module and design method thereof

Abstract

The invention discloses an optical module and a design method thereof. The optical module comprises: a circuit board, a high-speed signal line, a driving chip and an optical chip; the circuit board comprises a top plate and a metal layer under the top plate, the metal layer is the reference reflow layer of the top board; the driving chip, the high-speed signal line and the optical chip are all arranged on the top board, and the driving chip and the optical chip are connected through the high-speed signal line ; two pads are arranged on the transmission path of the high-speed signal line; the two pads are electrically connected through a coupling capacitor; the projection area of ​​the two pads in the metal layer is provided with an insulating area. In the optical module, the position where the pad is arranged on the high-speed signal line will not undergo sudden change in impedance, and the electromagnetic radiation there is also small, and the applicability is better.

Description

technical field [0001] The invention relates to the technical field of optical modules, in particular to an optical module and a design method thereof. Background technique [0002] At present, with the development of optical communication technology, the single-channel optical fiber rate has been increased from the previous 1G or 10G to the current 25G or 28G. Correspondingly, in order to meet the needs of high-speed development, the PCB of the optical module (that is, the photoelectric converter) (Printed Circuit Board, printed circuit board, referred to as circuit board) The circuit of the board is also designed as a high-speed circuit. [0003] Generally, the PCB board of an optical module includes multiple layers, which are respectively a metal layer and a dielectric layer arranged in an adjacent metal layer. Components, such as a driver chip, are usually arranged on the top metal layer, and are connected to the driver chip. optical chip. In the circuit design of the ...

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Problems solved by technology

[0006] The purpose of the embodiment of the present invention is to provide an optical module and its design method to solve the problem of the existing optical module. After the coupling capacitor is connected to the high-speed signal line of the PCB board, the impedance on the high-speed signal transmission path will be reduced at the pad. Changes, poor use of the problem

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