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How Small Can Intermediate Frequency Be in Coherent Ask Lightwave Systems?
M. Okan TANRIKULU
IEICE TRANSACTIONS on Communications
Publication Date: 1995/08/25
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Optical Communication
optical communication, communication theory,
Full Text: PDF(456.6KB)>>
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 (fIFT=αopt, 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.