Second-Order Distributed Feedback Lasers with Mode Selection Provided by First-Order Radiation Losses

Journal Article · Fri Feb 01 04:00:00 EST 1985 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/JQE.1985.1072627· OSTI ID:5382638

Kazarinov, R F; Henry, C H

The authors present a theoretical study of the effect of radiation losses on the mode selectivity of DFB lasers with second-order gratings. For a second-order grating, interference of the radiation due to firstorder diffraction of oppositely propagating guided waves cancels the radiation loss at one of the edges of the spectrum gap. This provides threshold gain discrimination of order 10 cm/sup -1/ against one of the two dominant modes occurring near the edges of the gap. This should allow fabrication of DFB lasers with properties that are nearly independent of the positions of the facets relative to the grating corrugations, which are uncontrolled. By applying antireflection coatings to the two ends, differential quantum efficiencies close to those of conventional FabryPerot lasers should be achievable.

• Research Organization: ATandT Bell Laboratories, Murray Hill, NJ 07974.
• OSTI ID: 5382638
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE-21:2; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
DISTRIBUTION
ENERGY LOSSES
FEEDBACK
LASERS
LOSSES
MODE SELECTION
RADIATION EFFECTS