Fig. 1. Schematics of BHD structure

Fig. 2. Schematics of photodetector

Fig. 3. Schematics of PIN test

Fig. 4. Test results of PIN performance

Fig. 5. Schematic diagram of detector circuit

Fig. 6. Diagram of the testing system

Fig. 7. Schematic of the CMRR

Fig. 8. Ratio of detector shot noise to electronical noise