A silicon-based monolithic 850 nm optical receiver is proposed,including a P+/N-EPI/BN+ photodetector(PD),a tranimpedance preamplifier and a relevant processing circuit.The structure of photodetector is analyzed,and its spectral response and frequency response are simulated.The responsivity is 0.131 A/W and the cut-off frequency is 400 MHz for 850 nm under 2.0 V reverse bias.The actual chip area of the optical receiver is about 900 μm×1 100 μm with 0.5 μm BCD(bipolar,CMOS and DMOS) process.Measurement results show that the dark current of photodetector is at pA magnitude and the responsivity is 0.12 A/W.The sensitivity is-12.0 dBm at 155 Mb/s and BER is less than 10-9,and the sensitivity is-10.0 dBm at 622 Mb/s and BER is less than 10-9.A clear eye diagram is demonstrated for 622 Mb/s pseudorandom binary sequence.A good optical signal path in point-to-point experiment can be obtained by implanting packaged optical receiver in commercial optical receiver module.