Analysis of current self-distribution induced by self-focusing filamentation in laser diode

Abstract

We investigate the squeezing potential of several 1.55 pm DFB lasers with different structures and parameters. Figure 2 presents the intensity fluctuations measurements of a 1.55 pm compressively strained MQW DFB laser with cleaved facets at room temperature under noise suppressed and shot-noiselimited current injection. The laser fluctuations in both cases exceed the shot-noise limit, but a decrease of 0.7 dB in the noise level is observed under quiet pumping conditions. The excess noise that degrades the squeezing is also examined and it appears that the source of most of this noise is associated with the presence of weak longitudinal side modes resulting from a low K~ value.