FM SUBCARRIER FIBER OPTICAL-TRANSMISSION SYSTEM-DESIGN AND ITS APPLICATION IN NEXT-GENERATION WIRELESS ACCESS

This paper presents a design method of optical frequency modulation (F M) subcarrier (with super carrier) transmission modem, The nonideal li nk characteristics, including laser chirping, fiber dispersion, voltag e controlled oscillator (VCO) phase noise, relative intensity noise (R IN), and equivalent network model of laser diode of such a system that may bring about signal distortion are discussed first, We then propos e a hierarchical methods to establish the system equivalent model, Fin ally this FM modem is applied to a GSM wireless system, in which multi channel signals are transmitted over fiber between radio port and base station, 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 inte nsity modulated direct detection (IMDD) method, and this is a economic al and efficient method.