Chirp Reduction in a Single Mode DM-SQW-DFB Laser Operated at Second Quantization State

We have observed the reduction in the chirp parameters (gain compression and above threshold α-factor) by operating the single quantum well laser at second quantization state. In this study, the carrier density at threshold is clamped by increasing the total cavity loss, so that the second energy level is populated leading to operation at second quantization state. We have identified wavelength shift towards the shorter wavelength side of the spectrum. Implies higher differential gain of the lasing mode, consequently decreases the effect of chirping in a directly modulated single QW laser.