Patent ID: 8175461
Filing Date: 2012-05-08
Classification: H04B,H04J

Abstract:
1. An optical module capable of receiving an analog optical signal and a digital optical signal, and transmitting another digital optical signal, comprising: a tri-plexer optical subassembly that provides an analog module that receives said analog optical signal with a first wavelength, a bi-directional module that receives said digital optical signal with a second wavelength and transmits said another digital optical signal with a third wavelength and a WDM filter, wherein said bi-directional module has a single package different from a package of said analog module, said package of said bi-directional module commonly installing a semiconductor light-receiving device for receiving said digital optical signal and a semiconductor light-emitting device for emitting said another digital optical signal, wherein said WDM filter discriminates said first wavelength from said second and third wavelengths, and wherein said bi-directional module has an optical axis substantially perpendicular with an optical axis of said analog module; a housing including a base made of resin and a metal shell that provides a frame ground; a printed circuit board that installs a first electrical circuit coupled with said analog module and a second electrical circuit coupled with said bi-directional module, said first electrical circuit being electrically isolated from said second electrical circuit except for a signal ground of said optical module; and a ground plate fixed to said bi-directional module and to said signal ground on said printed circuit board, said ground plate grounding said bi-directional module to said signal ground on said printed circuit board.