Title :
Computer simulation of FSK laser spectra and of FSK-to-ASK conversion
Author :
Marcuse, Dietrich
Author_Institution :
AT&T Bell Lab., Holmdel, NJ, USA
fDate :
7/1/1990 12:00:00 AM
Abstract :
The performance of binary frequency shift keyed (FSK) modulated two-segment semiconductor injection lasers is simulated by generating a 64-b pseudorandom step-function bit pattern. This signal, superimposed on a DC bias, is used to drive a two-segment distributed feedback (DFB) laser. To obtain the optical laser spectrum, the input signal is passed through the laser´s small-signal transfer function. The resulting spectrum is passed through a Fabry-Perot filter that rejects one of the two principal peaks of the wide-deviation optical spectrum and converts the FSK modulation to amplitude shift keying (ASK) modulation. This simulation determines how different system parameters influence the performance of a laser system used for signal transmission by means of FSK-to-ASK conversion
Keywords :
amplitude modulation; distributed feedback lasers; frequency shift keying; optical filters; optical modulation; semiconductor junction lasers; FSK laser spectra; FSK modulation; FSK-to-ASK conversion; Fabry-Perot filter; amplitude shift keying; binary frequency shift keyed; distributed feedback laser; laser transfer function; modulated two-segment semiconductor injection lasers; optical laser spectrum; pseudorandom step-function bit pattern; signal transmission; small-signal transfer function; two-segment distributed feedback; Amplitude modulation; Amplitude shift keying; Computer simulation; Distributed feedback devices; Frequency shift keying; Laser feedback; Optical feedback; Optical filters; Optical modulation; Semiconductor lasers;
Journal_Title :
Lightwave Technology, Journal of
