Title :
Pure frequency modulation of a multielectrode distributed-Bragg-reflector (DBR) laser diode
Author :
Ishida, O. ; Toba, H. ; Tohmori, Y.
Author_Institution :
NTT Transmission Syst. Labs., Kanagawa, Japan
fDate :
7/1/1989 12:00:00 AM
Abstract :
Intensity-modulation suppressed frequency modulation (FM) is demonstrated over a 600-MHz bandwidth by using a three-electrode distributed-Bragg-reflector (DBR) laser diode (LD). A nonuniform carrier-density distribution in the active region is realized by two separated electrodes, whose push-pull modulation yields only a 0.7% intensity fluctuation per 1-GHz frequency deviation. This corresponds to a 20-dB FM purity improvement. A third electrode on the DBR region makes it possible to tune the wavelength simultaneously. Because of its wider modulation bandwidth, the LD is suitable for the lightwave oscillator in frequency-shift-keyed (FSK) transmissions and for linewidth reduction by electrical feedback.<>
Keywords :
distributed Bragg reflector lasers; electrodes; frequency modulation; laser tuning; optical communication equipment; optical modulation; semiconductor junction lasers; 20-dB FM purity improvement; 600 MHz; FSK transmissions; active region; distributed-Bragg-reflector; electrical feedback; frequency-shift-keyed; intensity fluctuation; intensity modulation suppressed FM; lightwave oscillator; linewidth reduction; modulation bandwidth; multielectrode DBR laser diode; nonuniform carrier-density distribution; pure frequency modulation; push-pull modulation; three-electrode; tune; Bandwidth; Diode lasers; Distributed Bragg reflectors; Electrodes; Feedback; Fluctuations; Frequency modulation; Frequency shift keying; Intensity modulation; Oscillators;
Journal_Title :
Photonics Technology Letters, IEEE
