Abstract
Data-format-independent all-optical transmitter and receiver modules for free-space optical communications in the 3.8 mum region have been developed, essentially consisting of Ti-indiffused, periodically poled LiNbO(3) waveguides. Using these modules, conversion of C-band radiation to/from the mid-infrared (MIR) via difference-frequency generation was demonstrated. More than 10 mW 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 -41 dB fiber-to-fiber loss; only -15 dB are due to the parametric processes.
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