Title :
Amplitude and frequency modulation characteristics of widely tunable GCSR lasers
Author :
Saavedra, A.A. ; Rigole, P.-J. ; Goobar, E. ; Schatz, R. ; Nilsson, S.
Author_Institution :
Center for Telecommun. Studies, Pontificia Univ. Catolica do Rio de Janeiro, Brazil
Abstract :
The amplitude (AM) and frequency (FM) modulation responses of a grating assisted codirectional coupler with rear sampled grating reflector laser were measured over a 40-nm tuning range. The extracted modulation bandwidth varied between 3 and 4 GHz and parameters as parasitic cutoff, maximum relaxation frequency and K-factor were extracted from curve fittings to the AM response. The frequency modulation measurements revealed low chirp despite the large tunability of the device. The linewidth enhancement factor was calculated from the AM and FM measurements. The values ranges from three to nine for ten different operating wavelengths.
Keywords :
amplitude modulation; chirp modulation; diffraction gratings; distributed Bragg reflector lasers; electro-optical modulation; frequency modulation; laser tuning; optical directional couplers; semiconductor lasers; spectral line breadth; 3 to 4 GHz; AM measurements; AM response; FM measurements; K-factor; amplitude modulation characteristics; curve fittings; frequency modulation characteristics; frequency modulation measurements; grating assisted codirectional coupler; large tunability; linewidth enhancement factor; low chirp; maximum relaxation frequency; modulation bandwidth; operating wavelengths; parasitic cutoff; rear sampled grating reflector laser; tuning range; widely tunable GCSR lasers; Amplitude modulation; Bandwidth; Chirp modulation; Frequency measurement; Frequency modulation; Gratings; Laser beam cutting; Laser tuning; Optical coupling; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
