Title :
The design assessment of λ/4 phase-shifted DFB laser structures
Author :
Whiteaway, James E A ; Thompson, H. H B ; Collar, Andrew J. ; Armistead, Christopher J.
Author_Institution :
STC Technol. Ltd., Harlow, UK
fDate :
6/1/1989 12:00:00 AM
Abstract :
A detailed nonlinear model of the performance of single-frequency laser structures operating both below and above threshold is discussed. Arbitrary series combinations of uniform pitch grating, linearly-chirped pitch grating and plane guide sections can be analyzed-taking longitudinal-mode spatial hole burning into account. The material properties of each section of a device structure can be specified. The output power from each end of the laser and the emission wavelength, and the longitudinal intensity, carrier density, and relative permittivity profiles are predicted as a function of drive current above threshold for each lasing mode. The linewidth is also estimated while allowing for the nonuniform longitudinal distribution of spontaneous emission into the mode in a physical manner. The model was used to provide the data with which to trade off the numerous interacting performance parameters of a λ/4 phase-shifted DFB (distributed-feedback) laser. The design options are then summarized
Keywords :
distributed feedback lasers; laser theory; semiconductor device models; semiconductor junction lasers; λ/4 phase-shifted DFB laser structures; carrier density; design; drive current; emission wavelength; lasing mode; linearly-chirped pitch grating; linewidth; longitudinal intensity; longitudinal-mode spatial hole burning; nonlinear model; output power; plane guide sections; relative permittivity profiles; single-frequency laser structures; spontaneous emission; uniform pitch grating; Charge carrier density; Gratings; Laser modes; Laser theory; Material properties; Optical design; Permittivity; Power generation; Power lasers; Spontaneous emission;
Journal_Title :
Quantum Electronics, IEEE Journal of
