Impact of Clipping and Chirping Effects on AM-VSB CATV Sub-carrier Multiplexed Optical Systems

Abstract

The concurrent effects of clipping distortion and frequency chirping, on directly modulated laser sources in cable television sub-carrier multiplexed systems, is analysed and discussed. The numerical model, which is proposed in this paper for the first time, allows the physical mechanisms of the laser diode to be taken into account. Simulation results show the impact of both the considered effects on the system performance, in terms of three distortion parameters: Composite Second Order (CSO), Composite Triple Beat (CTB) and Non-Linear Distortions (NLD). Taking into account all the effects influencing the performance, the reported method can be favourably used for the design of analog CATV distribution systems.

Hybrid Fiber Radio Systems: Features and Performance

“…The performance of the optical link has been reported in terms of the CNR versus the optical modulation index (OMI) of the single channel. It is worth noting that such an analysis is similar to the one we reported in [16]. However, the total bandwidth, in the cases treated in the present paper, is quite different than in the case of CATV signal distribution: we consider here, in some cases, a total bandwidth of the order of the GHz, that is quite larger than the one considered for CATV systems.…”

“…Basically, two reasons can be individuated for this: i) the overall bandwidth of the SCM signal increases and, consequently, the noise contributions grow accordingly; ii) the probability of clipping events (e.g. the clipping induced total distortion) increases when there are more carriers [16].…”

Analysis of Wireless Broadband Systems employing Optical Fiber Links

“…Basically, two reasons can be individuated for this: I) the overall bandwidth of the RF signal increases and, consequently, the noise contributions grow; 2) the probability of clipping events (e.g. the clipping induced total distortion) increases when there are more carriers [4].…”