Tunable multiple quantum well distributed Bragg reflector lasers

Thomas L. Koch

Research output: Contribution to conferencePaperpeer-review


The properties that multiple-quantum-well (MQW) distributed feedback lasers offer for improved fabrication and performance characteristics in two- and three-section tunable distributed Bragg reflector (DBR) lasers are discussed. In these structures, an approximately 3000-angstrom-thick, 1.3-μm λPL (photoluminescence peak wavelength) InGaAsP layer serves as the largely continuous waveguide along the entire device length transparent at the approximately 1.5-μm wavelength of the laser operation. Gain in the first section is provided by a set of four InGaAs quantum wells with their 80-angstrom thickness chosen to provide the appropriate quantum shift for gain in the approximately 1.5-μm range. The advantages are: (1) lower propagation los in the active section, contributing to a higher ηd; (2) markedly improved coupling between the active and passive waveguide regions; and (3) a reduced linewidth-enhancement factor α for improved dynamic and noise characteristics.

Original languageEnglish (US)
Number of pages2
StatePublished - 1989
EventQuantum Electronics and Laser Science Conference - Baltimore, MD, USA
Duration: Apr 24 1989Apr 28 1989


OtherQuantum Electronics and Laser Science Conference
CityBaltimore, MD, USA

ASJC Scopus subject areas

  • General Engineering


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