3 ms·
Very roughly minimum loss is 50% for a far-field optical or RF system (near-field can be better), excluding the energy cost of building the transmitter/receiver
by kurthr 4y ago
Very roughly minimum loss is 50% for a far-field optical or RF system (near-field can be better), excluding the energy cost of building the transmitter/receiver systems themselves. Losses due to impedance mismatch make this difficult to improve. The most efficient light emitters are ~50% and the best optical photo-voltaics are also ~40%, which would get you to an 80% loss, ignoring atmospheric losses.
- jhgb 4y ago> The most efficient light emitters are ~50% and the best optical photo-voltaics are also ~40%, which would get you to an 80% loss, ignoring atmospheric losses. Unless you have matched emitters and PV cells? For example [1] cites 53.4% conversion efficiency for monochromatic light. (The 40% figure was presumably sunlight conversion efficiency?) [1] https://ieeexplore.ieee.org/document/4922910 https://ieeexplore.ieee.org/document/4922910