Design of Optical Fiber Communication System Under Carrier Photodiode/Compact PCI Bus and Signal Data Modulation

Abstract

This study was developed to design a high-speed and high-power uni-traveling-carrier photodiode (UTC-PD). Gaussian doping is adopted in the absorption layer, and a thin-doped cliff layer is introduced above the collection layer. The effects on the high-speed performance of UTC-PD are analyzed, and the thickness and concentration of absorption layer, cliff layer, and collection layer are optimized. Then, the carrier optical detector is used in optical fiber communication system, and a small pluggable SFP fiber module is used to realize the conversion of photoelectric signal. Based on the test requirements, the test platform of optical fiber communication system is built, and the CPCI bus based on PCI9054 is designed to communicate with the industrial computer. Meanwhile, a multi-polarization and high-order modulation scheme is designed for optical signal. The effects of transmission power, transmission distance, and optical signal-to-noise ratio (OSNR) on the transmission performance of orthogonal amplitude modulation (DP-16QAM, DP-32QAM) signals are analyzed by simulation. Simulation analysis shows that the optimized UTC-PD has improved its high speed and saturation, whose 3 dB bandwidth is up to 56 GHz, and responsiveness up to 0.28 A/W. In high-speed serial differential data transmission, the optical fiber communication system based on carrier optical detector/CPCI bus receives and sends reliably, and the error code value is always 0. Based on the signal modulation scheme in this study, the increase of OSNR can reduce the bit error rate (BER), and the bit error rate of 2A8P-16QAM and 4A8P-32QAM will decrease, that is, the signal transmission needs a higher optical signal-to-noise ratio.