Optical receiver based on BCD process for plastic optical fiber

The structure and characteristics of a photodetector(PD)and its post amplifiers were investigated,and a high-speed monolithic optical receiver for Plastic Optical Fiber(POF)communication was implemented.Firstly,a model of PD structure was established and simulated in a software simulating device based on the process flows and parameters.The spectral responsibility and ajunction capacitor were also derived in theory and simulation.Then,the post amplifiers consist of a trans-impedance,a limiting amplifier and an out buffer were simulated in Cadence/spectre by using the PD parameters.Finally,by using the 0.5μm(Bipolar,CMOS and DMOS)BCD process,the single PD and the monolithic integrated circuit of PD and post amplifiers were taped out,packaged and tested.The tested results indicate that the peak of optical spectral responsible curve agrees with that of the simulated curve,and the wavelength is about 700nm.The junction capacitance of PD decreaseswith increasing of the bias voltage and the bigger the junction capacitance,the smaller the bandwidth of optical receiver.For a 650nm input light,the sensitivity of the optical receiver is-14dBm under the bit-error-rate of 10-9.Moreover,a clear eye-diagram with the speed of 150Mb/s is achieved.The designed optical receiver can be applied to 100Mb/s optical fiber communication systems.