Title :
Penalty free biphase linecoding for pattern independent FSK coherent transmission systems
Author :
Hooijmans, Pieter W. ; Tomesen, Mark T. ; Van De Grijp, Abram
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
fDate :
3/1/1990 12:00:00 AM
Abstract :
Biphase coding is used to eliminate the unwanted influence of nonuniform laser characteristics in frequency-shift-keying (FSK) transmission systems. Compared to other (ternary) linecoding schemes, biphase has the advantage that it does not give a 3-dB sensitivity penalty when properly decoded in the receiver. This has been demonstrated in a 140-Mb/s 280-Mbaud transmission experiment. The receiver features a new type of reliable unambiguous clock extraction. Due to the compact IF spectrum, as compared with ternary linecoding schemes, biphase equipped FSK systems are especially suited for efficiently spaced coherent multichannel (CMC) systems. FSK heterodyne transmission experiments show a sensitivity ηP of -56.7 dBm for 210-1 pseudorandom patterns, only 4.8 dB from the shot-noise limit
Keywords :
encoding; frequency shift keying; light coherence; optical links; optical modulation; 140 Mbit/s; FSK heterodyne transmission; biphase linecoding; coherent multichannel; compact IF spectrum; decoded; frequency-shift-keying; nonuniform laser characteristics; optical modulation; pattern independent FSK coherent transmission systems; penalty free linecoding; pseudorandom patterns; receiver; sensitivity; shot-noise limit; subcarrier modulation; ternary linecoding schemes; unambiguous clock extraction; Ambient intelligence; Clocks; Decoding; Diode lasers; Distributed feedback devices; Frequency modulation; Frequency shift keying; Modulation coding; Optical signal processing; Optical transmitters;
Journal_Title :
Lightwave Technology, Journal of
