OPTICAL TRANSMISSION SYSTEM WITH A RECEIVER USING FULL OPTICAL CLOCK RECOVERY

摘要

In optical transmission system, a sequence temporal partitioning multiplex pulse is generated in transmitter (2) and arrives receiver (6) via optical transmission medium (4). It is applied to active optical demultiplexer (30) and clock recovery element (48) in receiver (6) received optical multiplex signal. Clock recovery element (48) generates optical clock pulse, and which be used to control the photoswitch (32. that optics controls. 38) which demultiplex optical signals. Optical clock recovery circuit based on by received optical signal be subject to the laser of mode locking. The mode-locked laser includes an image intensifer (50), it includes Polarization Controller (52) that its output end, which is connected to its input terminal by feedback control loop, saturable absorber (61), connector (56) and adjustable delay device (51). The optical signal received is coupled into the feedback loop and passes through coupling element (56). Saturable absorber (61) includes 3dB, and 90 ° of coupling element (54) is couple to secondary ring. The secondary loop includes attenuator (60) and amplifier (62). Amplifier (62) is asymmetrically positioned inside in secondary loop. Due to non-linear in secondary loop, the light pulse propagated in secondary loop is devastatingly interfered for signal level, and disturbs constructively horizontal for high signal.