Abstract
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 language | English (US) |
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Pages | 72-73 |
Number of pages | 2 |
State | Published - Dec 1 1989 |
Externally published | Yes |
Event | Quantum Electronics and Laser Science Conference - Baltimore, MD, USA Duration: Apr 24 1989 → Apr 28 1989 |
Other
Other | Quantum Electronics and Laser Science Conference |
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City | Baltimore, MD, USA |
Period | 4/24/89 → 4/28/89 |
ASJC Scopus subject areas
- Engineering(all)