Title :
Extinction ratio improvement by strong external light injection and SPM in an SOA for OTDM pulse source using a DBR laser diode
Author :
Hu, Zhaoyang ; Davanco, Marcelo ; Blumenthal, Daniel J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA, USA
Abstract :
We demonstrate above 6-dB extinction ratio (ER) improvement by strong external light injection for 20-GHz optical pulses generated from a gain-switched high-speed distributed Bragg reflector (DBR) laser diode. The pulses also exhibit a reduced chirp accompanied with a reduced total root-mean square noise. Above 12-dB pulse ER improvement was further obtained with self-phase modulation (SPM) effect in a semiconductor optical amplifier (SOA) followed by an optical bandpass filter. Stable 40-GHz pulses were demonstrated through passively multiplexing the pulses with 6-ps pulsewidth.
Keywords :
band-pass filters; chirp modulation; distributed Bragg reflector lasers; electro-optical modulation; laser noise; optical filters; optical pulse generation; self-phase modulation; semiconductor device noise; semiconductor optical amplifiers; time division multiplexing; 20 GHz; 40 GHz; 6 ps; DBR laser diode; OTDM; OTDM pulse source; extinction ratio improvement; gain-switched high-speed distributed Bragg reflector laser diode; multiplexing; optical bandpass filter; optical time-division multiplexing; pulsewidth; self-phase modulation; semiconductor optical amplifier; strong external light injection; total root-mean square noise; Diode lasers; Distributed Bragg reflectors; Erbium; Extinction ratio; Optical noise; Optical pulses; Pulse amplifiers; Pulse modulation; Scanning probe microscopy; Semiconductor optical amplifiers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2003.818258
