LOCKING CHARACTERISTICS OF FABRY-PEROT SEMICONDUCTOR-LASER OSCILLATORS WITH SIDE-MODE INJECTION

A model to evaluate frequency locking by means of a power injection ne ar a side mode of the free-running frequency is presented. Semiconduct or optical nonlinearities govern the locking problem; they are represe nted by nonlinear coefficients that take into account both carrier flu ctuations and all relevant fast phenomena. Field equations are derived from coupled-mode theory, accounting for longitudinal variations by m eans of appropriate mean values. Examples of results show both the sin gle locked frequency-stable operation region and the case when the inj ected signal and the free-running field coexist. (C) 1996 Optical Soci ety of America