Patent ID: 6246499
Filing Date: 2001-06-12
Classification: H04B

Abstract:
An optical signal communication apparatus comprising:a transmitter for transmitting a first signal via a transmission medium to an other optical signal communication apparatus;a receiver for receiving a second signal transmitted via said transmission medium from said other optical signal communication apparatus;a signal level detector for detecting a received signal level of said second signal; anda signal level controller for controlling a transmitted signal level of said first signal in response to said received signal level, wherein said signal level controller comprises:a first comparing unit configured to compare a reference signal level and said received signal level, and in accordance therewith to output said transmitted signal level;a second comparing unit configured to compare a zero signal level and said received signal level, and in accordance therewith to output a selection signal; anda selector circuit configured to receive said selection signal, a stand-by signal level and said transmitted signal level, and in accordance therewith to selectively output one of said stand-by signal level and said transmitted signal level according to said selection signal.