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Generation of wavelength tunable gain-switched pulses from FP MQW lasers with external injection seeding

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4 Author(s)
Matsui, Y. ; Semicond. Technol. Lab., Oki Electr. Ind. Co. Ltd., Tokyo, Japan ; Kutsuzawa, S. ; Arahira, S. ; Ogawa, Y.

High-repetition rate (20 GHz), wavelength tunable (40 nm) optical pulses have been generated by gain switching of 1.55-μm Fabry-Perot (FP) multiple-quantum-well (MQW) lasers using continuous-wave (CW) light injection for longitudinal mode selection. After fiber compression, a pulse duration shorter than 5.8 ps was obtained over the entire wavelength tuning range. The pulsewidth, chirping characteristics and side-mode suppression ratio were investigated as functions of the seeding power and wavelength. In addition, we report on the observation of chaos and period doubling for a gain-switched laser without injection seeding, and show that irregular behavior can be suppressed by injection seeding of the laser.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 8 )