  The feasibility of achieving faster data transmission using advanced digital
modulation techniques over the current CMS Tracker analog optical link is
explored. The spectral efficiency of Quadrature Amplitude Modulation
-Orthogonal Frequency Division Multiplexing (QAM-OFDM) makes it an attractive
option for a future implementation of the readout link. An analytical method
for estimating the data-rate that can be achieved using OFDM over the current
optical links is described and the first theoretical results are presented.
