Scheme for all-optical clock division based on period doubling in semiconductor lasers

All-optical clock repetition-frequency division is realised by using period doubling in a semiconductor laser under modulation. A frequency-halved optical clock signal with low phase noise of -87 dBc/Hz is generated from a 12.4 GHz input optical clock. The generated clock signal can exhibit low phase noise over a large input frequency range (300 MHz)