Title :
Why FSK and CPFSK have identical linewidth requirements
Author :
Hooijmans, Pieter W. ; Tomesen, Mark T. ; Mols, Peter P G ; Depovere, Geert F G ; Van Gils, RenC A J C M
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
fDate :
8/1/1994 12:00:00 AM
Abstract :
CPFSK is the most widely used modulation scheme in coherent optical transmission. Theoretical analyses so far predicted a much more stringent linewidth requirement compared to ASK and FSK systems with noncoherent IF-detection. In this paper we present a unified linewidth analysis of ASK, FSK, CPFSK, and DPSK receivers, with leads to the conclusion that the linewidth performance of these different schemes is to a large extent identical. The inclusion of post-detection filtering in the analysis is critical for obtaining these results, which are supported by practical system measurements on a 1 Gbit/s phase diversity CPFSK receiver
Keywords :
frequency shift keying; optical modulation; optical receivers; phase shift keying; spectral line breadth; 1 Gbit/s; ASK; CPFSK; DPSK receivers; FSK; coherent optical transmission; linewidth requirements; modulation scheme; phase diversity CPFSK receiver; post-detection filtering; unified linewidth analysis; Amplitude shift keying; Delay; Differential quadrature phase shift keying; Frequency shift keying; Laser noise; Optical feedback; Optical filters; Optical noise; Optical receivers; Optical transmitters;
Journal_Title :
Lightwave Technology, Journal of
