Turn-on Time Delay of Uncooled Semiconductor Laser Diode Subject to External Optical Feedback: Theoretical Analysis

In this paper, the effect of external optical feedback (EOF) on the turn-on time delay (t(on)) of uncooled semiconductor laser diode (SLD) is investigated theoretically. The effects temperature of operation (T) and EOF on t(on). are calculated according to their effect on threshold carrier density (N-th). The temperature dependence (TD) of N-th is calculated according t(on) the TD of laser cavity parameters and not by the well-known Parkove relationship. Simulation results show that t(on) increases as T increases due to increasing of N-th. In addition, ton decreases as external reflectivity (r(ext)) increases when the phase of reflected light is coherent. While at incoherent reflected light, t(on) increases sharply around specified value of r(ext) where this leads to inoperable case for SLD.