Title :
Direct optical characterisation of DFB lasers for CPFSK system applications
Author :
Pedersen, R.J.S. ; Schiellerup, Gert ; Jacobsen, G. ; Bodtker, E.
Author_Institution :
Center for Broadband Telecommun., Electromagn. Inst., Tech. Univ. of Denmark, Lyngby, Denmark
Abstract :
The authors present a new optical characterisation method for single-frequency lasers that are to be applied in Gbit/s CPFSK systems. They use optical delay-demodulation to allow easy matching of the demodulator delay over a wide range of values. It is shown that for a particular device, when used in a 2.4 Gbit/s CPFSK system, the modulation index must be larger than 1.0 to obtain a bit error rate below 10-11. With a modulation index of 1.5, bit error rates below 5*10-13 have been measured.
Keywords :
digital communication systems; distributed feedback lasers; error statistics; frequency shift keying; laser variables measurement; optical communication equipment; optical modulation; semiconductor junction lasers; transmitters; 2.4 Gbit/s; BER; CPFSK system applications; DFB lasers; Gbit/s systems; bit error rate; demodulator delay matching; modulation index; optical characterisation method; optical communication transmitters; optical delay-demodulation; semiconductor lasers; single-frequency lasers;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19890743
