IMPACT OF APODISED LINEARLY CHIRPED FIBER GRATINGS ON THE PERFORMANCEOF DISPERSION-LIMITED SUBCARRIER SYSTEMS

In the paper, the authors investigate the impact of apodised linearly chirped fibre gratings on the performance of broadband dispersion-limi ted subcarrier-multiplexed (SCM) microwave systems. The impairment of both nonlinear distortion and intensity noise, arising from fibre disp ersion on the performance of a 20 channel FSK-microwave subcarrier sys tem, has been analysed. To reduce both types of dispersion-induced deg radation, apodised linearly chirped gratings have been employed as dis persion compensators. A simulation study for attaining the optimum par ameters of the equaliser, depending on the SCM system parameters, has been carried out. The simulation results of the system performance, in terms of the bit-error rate (BER) and the carrier-to-noise ratio (CNR ), reveal that dispersion-induced impairment can be sharply mitigated by using apodised linearly chirped gratings whose length 3L(g) where L -g is the minimum length to achieve dispersion compensation as obtaine d from theoretical derivations.