Patent ID: 7613391
Filing Date: 2009-11-03
Classification: G02B,H04J

Abstract:
1. A communication node comprising: an optical signal transceiver having at least one optical signal transmitting device and at least one optical signal receiving device to transmit and receive an optical signal to and from an opposite communication node; at least one optical signal transmitting communication line to transmit an optical signal to said opposite communication node; at least one optical signal receiving communication line to receive an optical signal from said opposite communication node; and a switching device, comprising: wherein said switching device is connected to said optical signal transmitting device and to said optical signal receiving device to transmit, when no failure has occurred in said optical signal transmitting communication line and in said optical signal receiving communication line, an optical signal fed from said optical signal transmitting device to said optical signal transmitting communication line and to transmit an optical signal fed from said optical signal receiving communication line to said optical signal receiving device, wherein when a failure has occurred in said optical signal transmitting communication line, said switching device switches such that said optical signal fed from said optical signal transmitting device is transmitted via said second bi-directional port to said optical signal receiving communication line, and wherein when a failure has occurred in said optical signal receiving communication line, said switching device switches such that said optical signal to be fed to said optical signal receiving device is received via said first bi-directional port from said optical signal transmitting communication line.