Optical links for cryogenic focal-plane array readout
نویسندگان
چکیده
An optical link can provide an interface channel for the focal-plane array that is immune to electromagnetic interfer ence (EMI) and can lower the heatload on the dewar. Our approach involves the use offiber-optics and an on$ocal.plane optical modulator to provide an interface to the focal-plane array (FPA). The EPA drives the modulator with an electrical signal. We evaluated specially fabricated A1GaAS/GaAS multiple quantum well (MQW) optical modulators, operating near 840 nm, for analog modulation, and we have used the results to calculate the performance of an optical interface link using experimentally determined device parameters. Link noise and dynamic range for an analoglinkwere estimated from a separate experiment using pigtailed fiber components. The performance of the MOW modulator system is compared to alternative strategies. Significant improvement in performance in comparison to conventional electronic interfaces appears to be possible.
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