| 摘要 |
An optical repeater includes a first converter (21) having converting an optical input signal into an electrical signal, an equalizing amplifier (22) which amplifies the electrical signal and which outputs an amplified electrical signal, and a timing extraction circuit (23) which extracts a timing signal from the amplified electrical signal. Also the optical repeater includes a phase inversion circuit (31) which receives the amplified electrical signal in synchronism with the timing signal and which outputs a phase-inverted signal in synchronism with the timing signal. The phase-inverted signal has a phase opposite to a phase of the amplified electrical signal. Further, the optical repeater includes a second converter (41, 42) having a diffused laser diode and converting the phase-inverted signal into an optical output signal, and a supervisory signal extraction circuit (50, 60) which extracts a supervisory signal contained in the optical input signal from the phase-inverted signal. The optical input signal includes a digital signal formed of a plurality of blocks. Each block has data composed of (2m+1) bit (where m is an integer) and one-bit parity so that each block is formed of a (2m+1)B1P code having an even parity. |
