Maximizing the Bandwidth Efficiency of the CMS Tracker Analog Optical   Links
  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. 
Stefanos Dris, Markus Axer, Costas Foudas, Karl Gill, Robert Grabit,   Jan Troska, Francois Vasey