ANALYSIS, FABRICATION, AND CHARACTERIZATION OF TUNABLE DFB LASERS WITH CHIRPED GRATINGS

This paper describes the analysis, fabrication, and characterization o f chirped grating tunable distributed-feedback (CGT DFB) semiconductor lasers. Both theoretical and experimental results show that the wavel ength tunability of DFB lasers can be enhanced by introducing pitch-ch irped grating structure. The tuning mechanism is also theoretically de monstrated. The proposed CGT DFB laser will be useful in optical syste ms using wavelength division multiplexed (WDM) networks and other appl ications, due to its broader continuous tunability and very easy fabri cation.