Patent ID: 6882801
Filing Date: 2005-04-19
Classification: H04B,H04J

Abstract:
1. An optical transmission system comprising: a main unit which inputs a first electric signal and outputs a plurality of first optical signals, and inputs a second optical signal and outputs a second electric signal; a plurality of sub units, each of which inputs one of said plurality of first optical signals from said main unit and outputs a third electric signal, and inputs a fourth electric signal and provides said second optical signal to said main unit; and a plurality of optical fibers, each of which connects said main unit and said plurality of sub units, wherein said main unit comprises: an electro-optical converter which inputs said first electric signal and converts said first electric signal to a first optical signal; a coupler unit comprising: an opto-electric converter which converts said second optical signal output from said output port to a second electric signal; and an electric signal output terminal which outputs said second electric signal.