Title :
Optical PSK modulation using injection-locked DFB semiconductor lasers
Author_Institution :
Fondazione Ugo Bordoni, Rome, Italy
Abstract :
Injection-locked distributed feedback (DFB) semiconductor lasers, with strong single longitudinal mode selection provided by the distributed grating are found to be appropriate for optical phase shift keying (PSK) modulation. Both small-signal analysis and large-signal numerical simulations are performed on the optical PSK modulation properties. The main limitations are found to arise from the anomalous bandwidth reduction near the edge of the locking range and the time needed to damp the relaxation oscillation. By the tradeoff of the two effects, parameter optimization is obtained.<>
Keywords :
distributed feedback lasers; optical communication equipment; optical modulation; phase shift keying; semiconductor junction lasers; DFB semiconductor lasers; PSK; anomalous bandwidth reduction; distributed grating; edge; injection locked distributed feedback semiconductor lasers; large-signal numerical simulations; locking range; optical phase shift keying modulation; parameter optimization; relaxation oscillation; single longitudinal mode selection; small-signal analysis; Distributed feedback devices; Gratings; Laser feedback; Laser modes; Optical feedback; Optical modulation; Performance analysis; Phase modulation; Phase shift keying; Semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
