Title :
Spectral linewidth of external cavity semiconductor lasers with strong, frequency-selective feedback
Author_Institution :
British Telecom Research Laboratories, Ipswich, UK
Abstract :
The spectral linewidth of 1.5 ¿m external cavity semiconductor lasers is investigated. For nonzero intermediate facet reflectivity, detuning from exact resonance is found to reduce linewidths substantially for strong, frequency-selective feedback. A 10 cm cavity gives linewidths below 1 kHz, while coherent systems requirements will be met by cavities under 2.5 cm.
Keywords :
laser cavity resonators; semiconductor junction lasers; coherent systems; detuning; external cavity semiconductor lasers; frequency-selective feedback; nonzero intermediate facet reflectivity; spectral linewidth;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19850467
