  As a concern with the reliability and mass of current optical links in LHC
experiments, we are investigating CW lasers and light modulators as an
alternative to VCSELs. In addition we are developing data links in air,
utilizing steering by MEMS mirrors and optical feedback paths for the control
loop. Laser, modulator, and lens systems used are described, as well as two
different electronic systems for a free space steering feedback loop. Our
prototype system currently operates at 1.25 Gb/s, but could be upgraded. This
link works over distances of order meters. Such links might enable one to move
communication lasers (e.g. VCSELs) and optical fibers out of tracking
detectors, for reasons such as reliability and power consumption. Some
applications for free space data links, such as local triggering and data
readout and trigger-clock distribution and links for much longer distances are
also discussed.
