Open AccessCoherence collapse and low-frequency fluctuations in quantum-dash based lasers emitting at 1.57 μm
Author(s) -
S. Azouigui,
Bryan Kelleher,
Stephen P. Hegarty,
Guillaume Huyet,
B. Dagens,
F. Lelarge,
A. Accard,
D. Make,
O. Le Gouezigou,
K. Merghem,
A. Martinez,
Qin Zou,
A. Ramdane
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.014155
Subject(s) - coherence (philosophical gambling strategy) , dash , laser , quantum , physics , optics , quantum optics , quantum mechanics , computer science , operating system
Optical feedback tolerance is experimentally investigated on a 600-mum-long quantum-dash based Fabry-Pérot laser emitting at 1.57mum. While quantum-dashes are structurally intermediate to quantum-wells and quantum-dots, the observed behaviour is distinctly like that of a quantum-well based laser but with greater stability. Coherence collapse and low-frequency fluctuation regimes are observed and are reported here. The onset of the coherence collapse regime is experimentally determined and is found to vary from -29 dB to -21 dB external feedback level when increasing the current from twice to nine times the threshold current.