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Why FSK and CPFSK have identical linewidth requirements

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5 Author(s)
Hooijmans, P.W. ; Philips Res. Lab., Eindhoven, Netherlands ; Tomesen, M.T. ; Mols, P.P.G. ; Depovere, F.G.
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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

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Lightwave Technology, Journal of  (Volume:12 ,  Issue: 8 )