Coherence collapse in single-mode semiconductor lasers due to optical feedback

Daan Lenstra, Bastiaan H. Verbeek, Arie J. den Boef

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Line broadening up to 25 GHz in a single-mode semiconductor laser with relatively strong optical feedback is reported and theoretically analyzed. Measurements of the coherence function were performed using a Michelson interferometer and demonstrate that the coherence length decreases by a factor 1000 (to approximately 10 mm) due to optical feedback. A self-consistent theoretical description is given, which is based on the view that coherence collapse is maintained due to optical-feedback-delay effects, in which quantum fluctuations play no role of importance. A connection with recently suggested chaotic behavior is made. The theoretical results obtained are in good qualitative and reasonable quantitative agreement with measurements.

Original languageEnglish
Pages (from-to)674-679
Number of pages6
JournalIEEE Journal of Quantum Electronics
Issue number6
Publication statusPublished - 1 Jan 1985
Externally publishedYes


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