How Small Can Intermediate Frequency Be in Coherent Ask Lightwave Systems?

M. Okan TANRIKULU  

Publication
IEICE TRANSACTIONS on Communications   Vol.E78-B   No.8   pp.1238-1244
Publication Date: 1995/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Optical Communication
Keyword: 
optical communication,  communication theory,  

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Summary: 
The impact of finite intermediate frequency (IF) on the sensitivity of heterodyne ASK lightwave receivers is examined and quantified. It is shown that certain choices of IF (fIFTopt, 3αopt/2, 2αopt, etc.) yield the same performance as infinite fIF where αopt is the optimum IF filter bandwidth when fIF=. The approximate results presented in this paper are within 0.4dB of exact results.