Effect of multi-input injection locking on hysteresis width and switching time in SMFP-LDs for short pulse switch

Abstract

In this paper, we have analyzed the effect of multi-input injection on the hysteresis width and rising-falling time of output signal at the dominant mode and the suppressed-injected mode of the single mode Fabry-perot laser diode (SMFP-LD). The dominant mode of SMFP-LD can be changed with the change in operating temperature and has a tunability of about 10 nm. The analysis of hysteresis width is useful for choosing the appropriate input power and wavelength detuning for input injected beam according to its applications. Latching application needs larger hysteresis width whereas for switching application lesser hysteresis width is preferred for less switching time. The hysteresis analysis is used to demonstrate short pulse controlled all-optical switch which includes SR latch as a control unit and 1x2 switch as a switching unit. Input control pulses are used to switch input data of 10 Gbps to output ports and the minimum control pulse observed is 280 ps. Clear waveforms, eye diagram and rising/falling time at outputs are obtained for the proposed optical short pulse controlled switching circuit.