“…Instabilities can occur even when the master and slave frequencies are perfectly matched, due to the depressed carrier number induced by optical injection. The dc biased slave laser exhibits several behaviors depending on the injection level and the frequency mismatch between the two lasers, including steady states [16], periodic self-oscillations [17], chaotic output [18]- [20], low-frequency fluctuations [21], four-wave mixing, and frequency conversion [22], among others. The steady state, in which the slave laser is frequency-locked to the master laser, has received particular attention [16], [23], [24].…”