Abstract

Data-format-independent all-optical transmitter and receiver modules for free-space optical communications in the 3.8μm region have been developed, essentially consisting of Ti-indiffused, periodically poled LiNbO3 waveguides. Using these modules, conversion of C-band radiation to/from the mid-infrared (MIR) via difference-frequency generation was demonstrated. More than 10mW of MIR power could be generated with the transmitter unit; the internal low-power conversion efficiency was 69%W. A free-space MIR link was set up with a 41dB fiber-to-fiber loss; only 15dB are due to the parametric processes.

© 2009 Optical Society of America

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