Title :
Two-electrode DFB laser filter used as a wide tunable narrow-band FM receiver: tuning analysis, characteristics and experimental FSK-WDM system
Author :
Chawki, Mouhamad Jamil ; Auffret, René ; Le Coquil, Emile ; Pottier, Patrice ; Berthou, Louis ; Paciullo, Henri ; Le Bihan, J.
Author_Institution :
CNET, Lannion, France
fDate :
10/1/1992 12:00:00 AM
Abstract :
Characteristics of a two-electrode DFB laser filter are studied both theoretically and experimentally. Using a matrix analysis of spontaneous emission, a continuous tuning range of 6.7 Å is achieved by changing both net field gains of the two electrodes. A total discontinuous tuning range of over 10 nm comprising alternating mode jumps and continuous tuning range of 4 Å are measured experimentally. The laser filter presents a FWHM bandwidth of 5 GHz which depends on the optical input power. In addition, it is demonstrated that a DFB laser filter can act as a frequency discriminator/photodetector, i.e., a narrow-band FM receiver, with a uniform bandwidth of 1.5 GHz. Using the two-electrode DFB laser for both transmitter and receiver, a two-channel FSK-WDM transmission system utilizing the discontinuous tuning range is reported. The advantage of such a device is the simplicity as compared to the heterodyne technique
Keywords :
distributed feedback lasers; frequency shift keying; laser tuning; optical filters; optical receivers; semiconductor lasers; wavelength division multiplexing; 1.5 GHz; 5 GHz; FSK-WDM system; FWHM bandwidth; continuous tuning range; discontinuous tuning range; matrix analysis; mode jumps; net field gains; optical input power; receiver; spontaneous emission; transmitter; tuning analysis; two-electrode DFB laser filter; wide tunable narrow-band FM receiver; Bandwidth; Laser modes; Laser theory; Laser tuning; Narrowband; Optical filters; Optical receivers; Optical transmitters; Optical tuning; Tunable circuits and devices;
Journal_Title :
Lightwave Technology, Journal of
