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(Abridged version) The CMS experiment at the LHC will begin operation in2007. The CMS Tracker sub-detector, comprises ~10 million detector channelsread out by ~40 000 analog optical links. The optoelectronic components havebeen designed to meet the stringent requirements of a HEP experiment in termsof radiation hardness, low mass and low power. Extensive testing has beenperformed on the components and on complete optical links in test systems.Their functionality and performance in terms of gain, noise, linearity,bandwidth and radiation hardness is detailed. Particular emphasis is placed onthe gain, which directly affects the dynamic range of the detector data. It hasbeen possible to accurately predict the variation in gain that will be observedthroughout the system. A simulation based on production test data showed thatthe average gain would be ~38% higher than the design target at the Trackeroperating temperature of -10{\deg}C. Corrective action was taken to reduce thegains and recover the lost dynamic range by lowering the optical receiver'sload resistor value from 100{\Omega} to 62{\Omega}. All links will have gainsbetween 0.64 and 0.96V/V. The future iteration of CMS will be operated in anupgraded LHC requiring faster data readout. In order to preserve the largeinvestments made for the current readout system, an upgrade path that involvesreusing the existing optoelectronic components is considered. The applicabilityof Quadrature Amplitude Modulation (QAM) in a HEP readout system is examined.The method for calculating the data rate is presented, along with laboratorytests where QAM signals were transmitted over a Tracker optical link. Theresults show that 3-4Gbit/s would be possible if such a design can beimplemented (over 10 times the equivalent data rate of the current analoglinks, 320Mbits/s).

Performance of the CMS Tracker Optical Links and Future Upgrade Using Bandwidth Efficient Digital Modulation