Patent ID: 7218861

Claim:
An optical transceiver comprising: a transmitting side path including: an input interface for inputting an electric signal; a multiplexing circuit for time-multiplexing the inputted electric signal; and an electricity-light converter for converting the time-multiplexed electric signal into a light signal; and a receiving side path including: a light-electricity converter for converting an inputted light signal into an electric signal; a demultiplexing circuit for demultiplexing the converted electric signal; and an output interface for outputting the demultiplexed electric signal; wherein, in the transmitting side path, said optical transceiver comprises: a first pseudo-random pattern generator for generating a pseudo-random pattern signal, and for outputting the pseudo-random pattern signal to the multiplexing circuit; and a first pseudo-random pattern detector for evaluating the pseudo-random pattern signal, which has been inputted to the transmitting side path through the input interface; in the receiving side path, said optical transceiver comprises: a second pseudo-random pattern generator for generating a pseudo-random pattern signal, and for outputting the pseudo-random pattern signal to the output interface; and a second pseudo-random pattern detector for evaluating the pseudo-random pattern signal, which has been inputted to the receiving side path through the demultiplexing circuit; and said optical transceiver further comprising: a first loopback path that transmits the pseudo-random pattern signal from the multiplexing circuit of the transmitting side path to the demultiplexing circuit of the receiving side path; and a second loopback path that transmits the pseudo-random pattern signal from the light-electricity converter of the receiving side path to the electricity-light converter of the transmitting side path.