Title :
Long-cavity multiple-phase-shift distributed feedback laser diode for linewidth narrowing
Author :
Ogita, Shouichi ; Kotaki, Yuji ; Matsuda, Manabu ; Kuwahara, Yoshiyuki ; Ishikawa, Hiroshi
Author_Institution :
Fujitsu Lab. Ltd., Atsugi, Japan
fDate :
10/1/1990 12:00:00 AM
Abstract :
A long-cavity multiple-phase-shift distributed-feedback (MPS-DFB) laser diode with three phase shifts in the corrugation for linewidth narrowing is discussed. The threshold gain difference and the field uniformity along the laser cavity of the MPS-DFB laser are analyzed by varying the amount and the position of phase shifts using the coupled-wave theory. It is shown that a large threshold gain difference and a uniform field distribution are obtained in the MPS-DFB laser with some special amount and position of phase shifts. Based on the analysis, a MPS-DFB laser with a 1200-μm-long cavity and three phase shifts was fabricated. This MPS-DFB laser exhibits stable single-mode operation and shows a very narrow linewidth of 830 kHz at an optical output power of 25 mW
Keywords :
distributed feedback lasers; laser cavity resonators; laser modes; laser theory; semiconductor junction lasers; spectral line breadth; 1200 micron; 25 mW; 830 kHz; MPS-DFB laser; corrugation phase shifts; coupled-wave theory; field uniformity; laser cavity; linewidth narrowing; long-cavity laser diodes; multiple-phase-shift distributed feedback laser diode; optical output power; single-mode operation; threshold gain difference; uniform field distribution; Diode lasers; Distributed Bragg reflectors; Distributed feedback devices; Laser feedback; Laser modes; Laser stability; Laser theory; Optical feedback; Optical refraction; Power lasers;
Journal_Title :
Lightwave Technology, Journal of
