Analysis of injection-locking in an optoelectronic oscillator

In this paper, we analyze the injection-locking phenomenon in an optoelectronic oscillator (OEO) considering negligible amplitude modulation of the injection signal. We deduce the mathematical expressions of the amplitude and phase variations in the OEO. The equations for the lock range after locking and beat-frequency are presented using quasi-linear approximation. Also, the spectrum components of the pulled OEO are derived. Finally, the simulation results are given to validate the analytical results.