Theoretical analysis of external optical feedback on DFB semiconductor lasers

Journal Article · Thu Jan 01 04:00:00 EST 1987 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/JQE.1987.1073195· OSTI ID:7099370

Favre, F

The effect of external optical feedback on resonant frequency, threshold gain, and spectral linewidth of distributed feedback (DFB) semiconductor lasers is theoretically analyzed. The analysis applies to any type of laser cavity formed by a corrugated waveguide limited by partially reflecting facets. It is shown that the sensitivity to optical feedback on a facet is closely related to the power emitted through this facet. Numerical results on wavelength selectivity and on sensitivity to optical feedback are given for conventional DFB lasers having an AR-coated facet and for quarter-wave-shifted (QWS) DFB lasers with AR-coatings on both facets. Both laser types are found to be more sensitive to optical feedback on their AR-coated facet than Fabry-Perot lasers for low kappaL. On the other hand, QWS-DFB lasers are found to be relatively insensitive to optical feedback for large kappaL.

• Research Organization: Centre National d'Etudes des Telecommunications (CNET), 22301 Lannion
• OSTI ID: 7099370
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE23:1; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
ANTIREFLECTION COATINGS
COATINGS
FABRY-PEROT INTERFEROMETER
FEEDBACK
FREQUENCY ANALYSIS
GAIN
INTERFEROMETERS
LASER CAVITIES
LASERS
LINE WIDTHS
MEASURING INSTRUMENTS
RESONANCE
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SENSITIVITY
WAVEGUIDES
WAVELENGTHS