LO: local oscillator; PBS: polarization beam splitter; OFE: optical front end, which contains two 90 degree hybrid mixers and four sets of balanced photodiodes. Principal setup of the coherent receiver frontend Innovations for the digital society of the future are the focus of research and development work at the Fraunhofer HHI. 55E-5 if the LO power is optimized at 11dBm. It captures the incoming light flux, converts it and amplifies it into an electrical signal. The designed receiver front-end includes a transimpedance amplifier(TIA), an automatic gain control (AGC) and a DC offset. Abstract: This paper presents design of front end optical receiver using CMOS 180nm technology. 8V and frequency range between 1Hz to 10GHz is used and.