Performance of FM Double Modulation for Subcarrier Optical Transmission

Ryutaro OHMOTO
Hiroyuki OHTSUKA

IEICE TRANSACTIONS on Communications   Vol.E76-B    No.9    pp.1152-1158
Publication Date: 1993/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Fiber-optic Microcelluler Radio Communication System and Their Technologies)
Category: Equipment and Device Matters
subcarrier multiplexing,  optical transmission,  frequency modulation,  intermodulation distortion,  microcell radio,  π/4-QPSK,  

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This paper presents a potential FM double modulation technique for subcarrier optical transmission in order to improve the input dynamic range. The proposed theory of FM double modulation is presented. The BER performance and input dynamic range are shown theoretically and experimentally compared with conventional direct intensity modulation. It was found that the dynamic range could be experimentally improved by 20dB compared with the conventional method by using FM double modulation. The proposed technique achieved an input dynamic range of 60 dB even when using a commercial Fabri-Perot LD.