Title :
Second- and higher order resonant gratings with gain or loss-Part II: designing complex-coupled DFB lasers with second-order gratings
Author :
Shams-Zadeh-Amiri, Ali M. ; Hong, Jin ; Li, Xun ; Huang, Wei-Ping
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
Abstract :
For part I see, ibid., p. 1421, (2000). This paper deals with the investigation of second-order DFB lasers with a gain grating. It is shown that by proper choice of the duty cycle, one may take advantage of the different radiation losses between the mode with the lowest threshold gain and the second mode to increase the single-mode yield and also obtain a strong complex-coupling with high external efficiency. The impact of the random phase of high-reflection (HR)-coated facet on modal properties in an anti-reflection and HR combination is also investigated.
Keywords :
antireflection coatings; diffraction gratings; distributed feedback lasers; laser modes; optical films; optical losses; semiconductor lasers; anti-reflection coatings; complex-coupled DFB laser design; duty cycle; high external efficiency; high-reflection-coated facet; higher order resonant gratings; lowest threshold gain; modal properties; optical gain; optical loss; radiation losses; second-order resonant gratings; single-mode yield; strong complex-couplin; Etching; Gratings; Laser modes; Laser theory; Optical coupling; Optical design; Optical fiber communication; Quantum well lasers; Resonance; Semiconductor lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
