Patent ID: 8290373
Filing Date: 2012-10-16
Classification: H04B,H04J

Abstract:
1. A transponder, comprising: a first optical-to-electrical converter that receives an optical signal, output from the client apparatus, and converts the received signal to an electrical signal; a transmission unit that receives the electrical signal, output from the first optical-to-electrical converter, and produces a transmission signal for an optical transmission network; a first electrical-to-optical converter that converts the transmission signal, output from the transmission unit, to an optical signal and delivers the converted optical signal to an input of a WDM (Wavelength Division Multiplexing) apparatus; a second optical-to-electrical converter that receives an optical signal, output from the WDM apparatus, and converts the received optical signal to an electrical signal; a reception unit that receives the electrical signal, output from the second optical-to-electrical converter, and produces a received signal; a second electrical-to-optical converter that converts the received signal, output from the reception unit, to an optical signal, and delivers the converted optical signal to an input of the client apparatus; and a switch unit that changes over among a first connection state in which the output of the first optical-to-electrical converter is connected to the input of the transmission unit and the output of the reception unit is connected to the input of the second electrical-to-optical converter; a second connection in which the output of the reception unit is loop-back connected to the input of the transmission unit; and a third connection state in which output of the reception unit is connected to the input of the transmission unit and the output of the reception unit is connected to the input of the second electrical-to-optical converter, a signal identical to a signal output by the reception unit and supplied via the second electrical-to-optical converter to the client apparatus being regenerated and repeated by the transmission unit for output to a destination WDM apparatus.