Optical transmission systems for cable television applications
Date
1995
Authors
Davidson, D'Arcy John
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Abstract
This thesis examines the use of fibre optic systems for the transmission of cable television signals. The low loss and high noise immunity of fibre optic systems make this technology a desirable alternative to the coaxial distribution systems presently in use, where many repeaters are necessary to carry the signal from head-end to subscriber. These repeaters both distort the signal and reduce the reliability of the transmission system. To be cost effective, fibre optic systems must be capable of transmitting the existing signal modulation formats. State-of-the-art optical transmitters can only transmit a limited number of channels due to noise and linearity constraints.
This thesis theoretically and experimentally evaluates a new linearization scheme for externally modulated optical systems which increases the channel capacity by improving the linearity and reducing the noise of the optical transmitter. This scheme is capable of transmitting 100 channels using existing modulation formats and frequency allocations.