We propose a novel implementation of a complex analog equalization filter for the compensation of frequency-dependent variations in coherent optical links. The analog compensation filter can be used in coherent-lite optical communication links where digital signal processing (DSP) is removed to limit the complexity and power consumption. In these links, the filter can compensate for electrical bandwidth limitations and distortion introduced by chromatic dispersion in the fiber. The complex filter is implemented by combining four distributed analog finite-impulse response (FIR) filters to obtain the necessary response. The filter delays are implemented using active delay cell structures to create a compact solution. The analog filter is implemented in a 55-nm BiCMOS technology and consumes 185-mW core power for five complex filter taps. Performance is evaluated using the S-parameter measurements, noise and linearity measurements, and real-time system experiments using 112-Gb/s 16-QAM-modulated signals.

中文翻译：

---

55-nm SiGe BiCMOS 中的模拟 I/Q FIR 滤波器，用于 112 Gb/s 的 16-QAM 光通信

我们提出了一种复杂模拟均衡滤波器的新实现，用于补偿相干光链路中频率相关的变化。模拟补偿滤波器可用于去除数字信号处理 (DSP) 以限制复杂性和功耗的相干光通信链路。在这些链路中，滤波器可以补偿由光纤中的色散引起的电带宽限制和失真。复合滤波器是通过组合四个分布式模拟有限脉冲响应 (FIR) 滤波器来实现的，以获得必要的响应。滤波器延迟是使用有源延迟单元结构实现的，以创建紧凑的解决方案。模拟滤波器采用 55-nm BiCMOS 技术实现，五个复杂滤波器抽头消耗 185-mW 核心功率。