1.25 Gb/s光突发模式接收机的设计

介绍了一种直流耦合跨阻抗光突发模式接收机。采用前馈式结构，通过快速峰值检波电路和延时单元的协同工作，使该光突发模式接收机具有：更低的误码率、较高的接收灵敏度、又有大的光接收动态范围；在输出端采用特殊的或非门技术，消除了干扰。其仿真结果表明：在传输速率为1.25 Gb/s，误码率BER≤10−9时，接收灵敏度为−24 dBm，最大可接收光功率−4 dBm，动态范围可高达20 dB，两分组信号保护时间为20 ns。
关 键 词 突发模式接收机; 峰值检波; 判决门限; 自适应判决

Abstract In this paper, a novel DC coupled feedforward type optical burst mode receiver is presented.Through the cooperation between the fast peak detector and the delay unit,the receiver is realized with lower BER, bettter receiver sensitivity and receiver dynamic range. The output NOR gate can cancell the unwanted peak in dead spaces between packet signals.The results of the simulation indicate that the receiver sensitivity is −24 dBm (average power, 10−9BER) at bit rates up to 1.25 Gb/s and the maximum receivable optical average power is −4 dBm, so the dynamic range is 20 dB. The minimum packet spacing required to properly recover the first bit in the second packet is 20 ns.
Key words burst mode receiver; peak detector; threshold; adaptive decision