Hacker News 上看到「Power over fiber (chaos.social)」這篇，是個透過雷射光傳遞能量再轉回電能的方式。
隨意先拉了其中一個 sku 來看，「3 VDC application; ST Port」的 AFBR-POC404L 單顆要 US$561.79：「AFBR-POC404L」，這顆輸入 1.8W 輸出 0.6W。
另外在「Optical Power Converters」這邊可以看到 AFBR-POC306A1 這顆，輸出可以到 3W，查到的單價則是 US$701.77 (AFBR-POC306A1)，這個功率已經連 Raspberry Pi 都可以上了...
不過從官方列出的應用來看，可以看到著重在電磁隔離的性質：
- Fully galvanically isolated power supply without capacitive coupling, suitable for gate drivers
- Isolation transformer for MRI/RF imaging without the need for filters
- Optically isolated probes for power electronics with a wider dynamic range than any conventional probe
- Power source for tethered drones, enabling a higher payload and eliminating the need for battery charging
- Sensors where power must be immune to EMI, high voltage, and magnetic fields
跟我一開始想的方向不太一樣...