Laser Induced Microwave Oscillator: A revisit

Abstract

Nothing has yet been reported on the existence of Barkhausen criterion and synchronization phenomenon in a LIMO. The present paper, aside considering the influence of a forcing signal, discusses the effect of amplitude modulated synchronizing signal on LIMO and the corresponding AM-PM conversion for the injection synchronized LIMO is studied in detail. In contradistinction to the previous works [1-9], three interesting results are reported in this paper, viz., (1) Modified Barkhausen criterion, resulting in the dependence free running frequency of oscillation on the loop-delay, (2) when the modulation index is small, the oscillator output is amplitude modulated wave both in the electrical and optical domain with almost no distortion; (3) oscillator output is modulation free when the carrier strength is small in comparison to that of the free-running oscillator. Moreover, the behavior of an LIMO in presence of a synchronizing signal have not been reported so far as far as the knowledge of the authors goes.