OPTICAL TIME-DIVISION MULTIPLEX TRANSMITTER

PURPOSE:To realize an optical time-division multiplex transmitter which has a high output level, and superior operation stability and manufacturing performance and is easily adjusted by coupling a light emitting element which has polarization characteristics with an optical multiplexer directly. CONSTITUTION:A semiconductor laser with a 1.3mum band is used as the light emitting element 4 and coupled directly with the light guide 22 of the optical multiplexer 6 without interposing any optical fiber in the middle. The coupling loss in this case is about 5dB and about 2dB less than when an optical fiber is connected in the middle. Further, the semiconductor laser 4 emits single polarized light, so the matching of the polarization dependency of the optical multiplexer 6 is excellent, polarization plane control is unnecessary, and the manufacturing performance is improved. Further, there is no jitter of a signal due to the delay in the optical fiber and variation in the delay time caused by oscillations and temperature variations, so the timing of a clock 12 is adjusted easily and the stability of operation is improved.