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[<< Section 3.9](/3-front-end-design/3.9)
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## 4.1 RF-over-Fiber Link Overview
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The analog signal from each antenna element must be transported over 3.5 km of optical fiber from the front end box at prime focus to the GBO data center, while maintaining a total system noise temperature below the design target. Our requirement is that the signal transport system must contribute less than 1 K to total system noise temperature, while offering suffificient dynamic range to handle typical GBT levels of radio frequency interference (RFI), without degrading the signal of interest. To accomplish this, we have designed an RF-over-fiber (RFoF) link by using McGill University's RFoF link for the Canadian Hydrogen Intensity Mapping Experiment (CHIME) [^1-Mena2013a] as a starting point, and then adapting it to meet ALPACA-specific requirements.
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