Title :
Optimized operation of self-seeded gain-switched laser diode for electrically wavelength-tunable singlemode pulses
Author :
Lee, Y.C. ; Shu, Chester
Author_Institution :
Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong
fDate :
3/1/1995 12:00:00 AM
Abstract :
A gain-switched Fabry-Perot laser diode at 1.3 μm was self-seeded at different electrical bias and optical feedback rates. With a strong feedback, a comparatively large tuning range and a high sidemode suppression ratio were obtained but multimode emission might occur around the center of the range. Similar phenomenon was observed at a weaker feedback when the electrical bias was sufficiently large. The degradation in tunability was attributed to a broadening of the optical pulses, resulting in temporal overlapping of different longitudinal modes. Our optimized feedback of 2.5% and 3.1 mA bias provided a tuning range of 23.5 nm with a sidemode suppression ratio >10 dB.
Keywords :
infrared sources; laser feedback; laser modes; laser tuning; optical fibre communication; optical switches; optimisation; semiconductor lasers; semiconductor switches; wavelength division multiplexing; 1.3 mum; 3.1 mA; comparatively large tuning range; electrical bias; electrically wavelength-tunable singlemode pulses; gain-switched Fabry-Perot laser diode; high sidemode suppression ratio; longitudinal modes; multimode emission; optical feedback rates; optical pulse broadening; optimized feedback; optimized operation; self-seeded gain-switched laser diode; sidemode suppression ratio; strong feedback; temporal overlapping; tunability; tuning range; weaker feedback; Diode lasers; Laser feedback; Laser modes; Laser tuning; Masers; Optical feedback; Optical pulse generation; Optical pulses; Optical tuning; Silicon compounds;
Journal_Title :
Photonics Technology Letters, IEEE
