Proceedings PaperBroadband Electrooptic Modulators For CO2 And Nd:YAG Laser Communication
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A space-qualifiable electrooptic phase modulator for broadband CO2 laser communications (wavelength 10.6 μm) was developed under ESA-contract in cooperation with the Institut fur Nachrichtentechnik and Hochfrequenztechnik / Technische Universitat Wien. The concept of a traveling wave modulator with an oversized optical waveguide -3 constituted by eight Cadmium-Telluride crystals in a row with 30x0.6x0.6 mm each - was employed to achieve the following performance data: electrical bandwidth 2 GHz, maximum VSWR 1.75: 1, optical transmittance > 80%, optical power handling 6 W cw, modulation efficiency 12.5% for 20 W RF drive power, modulation frequency response : ±1 dB up to 1GHz. In a follow-on ESA contract, Schrack Aerospace and the Institut fur Nach-richtentechnik and Hochfrequenztechnik cooperate to develop an intensity modulator for Nd: YAG laser radiation at 1.06 pm with the following specifications: maximum data rate 1 Gbit/s, optical transmittance > 76 %, optical power handling 1 W cw, 100% intensity modulation with 8 W RF power and 13 dB dynamic extinction ratio.