![Explain the basic principle of operation of photo detector. Explain the work of PIN diode and APD as photo detector, also compare their performance. Explain the basic principle of operation of photo detector. Explain the work of PIN diode and APD as photo detector, also compare their performance.](https://i.imgur.com/tVXKozN.png)
Explain the basic principle of operation of photo detector. Explain the work of PIN diode and APD as photo detector, also compare their performance.
![semiconductor physics - Difference between photodiodes and avalanche photodiodes - Physics Stack Exchange semiconductor physics - Difference between photodiodes and avalanche photodiodes - Physics Stack Exchange](https://i.stack.imgur.com/Zis0S.png)
semiconductor physics - Difference between photodiodes and avalanche photodiodes - Physics Stack Exchange
![Electronics | Free Full-Text | Bit Error Performance of APD and SPAD Receivers in Optical Wireless Communication Electronics | Free Full-Text | Bit Error Performance of APD and SPAD Receivers in Optical Wireless Communication](https://pub.mdpi-res.com/electronics/electronics-10-02731/article_deploy/html/images/electronics-10-02731-g001.png?1636525566)