Difference in partition noise for 1.55 μm quantum-dash and bulk structures

Abstract

The comparison of relative intensity noise (Rin) shows improved performances, for quantum dash laser (QD) compared to the ones of bulk medium structures. We introduced a statistical measurement through a coupling parameter that reveals the impact of strong damping on the competition between modes or the so-called partition noise. The existence of a strong damping in QD laser prevents the relaxation frequency from being observed in the coupling parameter, which makes the noise to appear as if the laser lines were inhomogeneous. However the method also enables the characterization of the coupling strength between modes, showing again differences between QD and bulk structures.

Single-mode quantum-dash laser submitted to optical injection: Nonstandard behaviour with respect to the slave pump

“…This paper focuses on the properties of a single-mode quantum dash laser emitting at 1.55 !-1m, submitted to optical injection. Recent results concern mainly multi-frequency quantum dot or dash lasers emitting at 1.55 !-1m [4] or single-mode quantum-dot laser emitting at 1.3 !-1m [5,6]. However, our devices, DFB quantum-dash laser emitting at 1.55 !-1m [7], doesn't reveal the same behaviour as the one described in [5].…”