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We report on the development of a prototype integrated receiver front-endthat combines all conversions from RF to baseband, from analog to digital, andfrom copper to fiber into one compact assembly, with the necessary gain andstability suitable for radio astronomy applications. The emphasis in thisarticle is on a novel digital data link over optical fiber which requires noformatting in the front-end, greatly reducing the complexity, bulk, and powerconsumption of digital electronics inside the antenna, facilitating itsintegration with the analog components, and minimizing the self-generatedradio-frequency interference (RFI) which could leak into the signal path.Management of the serial data link is performed entirely in the back-end basedon the statistical properties of signals with a strong random noise component.In this way, the full benefits of precision and stability afforded byconventional digital data transmission are realized with far less overhead atthe focal plane of a radio telescope.

Unformatted Digital Fiber-Optic Data Transmission for Radio Astronomy Front-Ends