Simulation study of BER and signal-to-noise ratio of a multichannel optical sub-carrier modulated QAM-VDSL signals

摘要

This work is a part of the project entitled Optical Access Key featuring Low-Power Electronic Adaptive Function (OAKLEAF). A partnership has been formed between the Universities of Cambridge and Essex that aims to build on existing research and has two thrusts; verify that VDSL modem compensation techniques can include impairments present in a complete link comprising optoelectronic, radio and copper media components and to produce a demonstrator showing ho VCSEL-based bandpass modulators may offer an effective interface for hybrid xDSL/optoelectronic access networks. In order to analyse and assess the effect of VCSEL non-linearties in a bandpass modulation context a simulation study has been carried out on an 8-channel optical sub-carrier modulated QAM-VDSL system. Also, a new integrated circuit functional block, a combiner and laser driver with predistortion circuit has been designed and simulated to compensate for the non-linearities of the VCSEL.