Optimization of a 54.8 GHz coupled opto-electronic oscillator through dispersion compensation of a mode-locked semiconductor laser

Dispersion impact on electrical signal generation at 54.8 GHz of a quantum dash (QDs) mode-locked Fabry-Perot (FP) lasers emitting at 1.55 mum has been measured. Optimum fibre length values that correspond to dispersion compensation have been found. For these optimal conditions a pulse width of 480 fs has been measured. These optimum fibre length values have been applied to the integration of two architectures of phase noise reduction schemes: a coupled opto-electronic oscillator (COEO) with a single self-injection loop associated to a self-phase-locked loop (PLL) and a dual loop COEO. A phase noise reduction of more than 30 dB at an offset frequency of 20 kHz has been obtained for the second architecture.