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FM subcarrier fiber optical transmission system design and its application in next-generation wireless access

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2 Author(s)
Juin-Hung Chen ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Hen-Wai Tsao

This paper presents a design method of optical frequency modulation (FM) subcarrier (with super carrier) transmission modem. The nonideal link characteristics, including laser chirping, fiber dispersion, voltage controlled oscillator (VCO) phase noise, relative intensity noise (RIN), and equivalent network model of laser diode of such a system that may bring about signal distortion are discussed first. We then propose a hierarchical methods to establish the system equivalent model. Finally this FM modem is applied to a GSM wireless system, in which multichannel signals are transmitted over fiber between radio port and basestation, and system performance is appraised by its dynamic range. It is found that optical FM subcarrier (with super carrier) transmission technique can improve the system dynamic range, compared with the intensity modulated direct detection (IMDD) method, and this is a economical and efficient method

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Lightwave Technology, Journal of  (Volume:16 ,  Issue: 7 )