Title :
Self-suppression effect of longitudinal spatial hole burning in absorptive-grating gain-coupled DFB lasers
Author :
Sudoh, Tsurugi K. ; Nakano, Yoshiaki ; Tada, Kunio ; Kikuchi, Kazuro ; Hirata, Takaaki ; Hosomatsu, Haruo
Author_Institution :
Dept. of Electron. Eng., Tokyo Univ., Japan
Abstract :
Longitudinal spatial hole burning (LSHB) induces degradation of longitudinal-mode stability in distributed-feedback (DFB) lasers. Measurement of frequency modulation characteristics has revealed that, in absorptive-grating gain-coupled DFB lasers, the LSHB diminishes as power increases. This anomalous behavior has been qualitatively explained by a theoretical analysis that took into account the saturable nature of the absorption of the gain-coupled grating. This LSHB suppression effect is advantageous for high-power single-longitudinal-mode operation of DFB lasers.<>
Keywords :
diffraction gratings; distributed feedback lasers; frequency modulation; laser modes; optical hole burning; optical modulation; optical saturable absorption; semiconductor lasers; LSHB suppression effect; absorptive-grating gain-coupled DFB lasers; anomalous behavior; degradation; distributed-feedback lasers; frequency modulation characteristics; high-power single-longitudinal-mode operation; longitudinal spatial hole burning; longitudinal-mode stability; power; saturable absorption; self-suppression effect; Absorption; Degradation; Frequency measurement; Frequency modulation; Gain measurement; Gratings; Laser stability; Laser theory; Power lasers; Power measurement;
Journal_Title :
Photonics Technology Letters, IEEE
