塑料光纤通信650nm单片集成光接收芯片研究

Research of 650nm Monolithic Optical Receiver for Plastic Optical Fiber Communication

设计了一种用于塑料光纤通信的650nm单片集成光接收芯片,包括光电探测器、跨阻前置放大器、单双端转换、差分放大器、输出缓冲器及失调电压补偿电路.基于合理假设与近似,从稳态连续方程和边界条件出发,分析了探测器的光谱响应;采用拉普拉斯变换方法,分析其频率响应.采用0.5μm BCD工艺流片,光接收芯片版图面积832×948μm2进行测试,结果表明5V反向偏压下,探测器在650nm的响应度为0.26A/W;光接收芯片在180Mbps速率及误码率小于10-9情况下,灵敏度为-14.6dBm;在100Mbps非归零伪随机二进制序列信号速率及误码率小于10-9情况下,能得到清晰的眼图.

A 650 nm monolithic optical receiver for plastic optical fiber communication ts proposed, including a photodetector, a tranimpedance preamplifier, a single to differential conversion, a cascade of differential amplifiers, an output buffer and an offset voltage compensation. Based on reasonable assumption and approximation, the spectral response of photodetector is analyzed according to its steady-state continuity equation and boundary conditions. Analysis of frequency response is established due to the basic equations of the photodetector by Laplace transform method. The layout area of monolithic optical receiver is about 832 × 948μm2 with 0. 5 /am BCD process. Measurement results indicate that the responsivity of photodetector is 0.26 A/W for 650 nm at 5 V reverse bias. The sensitivity is -14.6 dBm at 180 Mbps and bit error rate less than 10 9. A clear eye diagram is demonstrated for 100Mbps pseudorandom binary sequence and bit error rate less than 10-9.