A 4 × 56-Gbaud PAM-4 Optical Receiver Integrated With SiGe-BiCMOS TIA

IF 2.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2024-10-17 DOI:10.1109/LPT.2024.3482566

Wei Chen;Minhao Li;Ming Zhong;Yuan Li;Ying Wu;Pisen Zhou;Tao Xia;Patrick Yin Chiang

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引用次数: 0

Abstract

A chip-on-board (COB) packaged four-channel optical receiver integrated with a transimpedance amplifier (TIA) in 0.13-

$\mu $

m SiGe-BiCMOS technology with fT/fMAX =260/350 GHz demonstrating 56-Gbaud four-level pulse-amplitude modulation (PAM-4) with low noise and high linearity is presented in support of optical receivers required in linear-drive pluggable optics (LPO) and beyond-400G optical links. The proposed four-stage optical receiver comprises an inductive shunt-feedback TIA followed by two variable gain amplifiers (VGAs) with a continuous-time linear equalizer (CTLE) function and a 50-ohm output buffer. The

$\pi $

-topology L-C network and inductive shunt feedback techniques are used in TIA to meet the specifications of wide bandwidth (BW) and low noise. Two current-splitting VGA stages with CTLE function cascaded after TIA featuring high reliability can compensate for the loss of BW which caused by photo diode (PD) parasitic capacitance and provide a gain control range of −12dB ~ +18dB that accommodates input current up to 2mApp with low group delay variation. The 50-ohm output buffer with a T-coil and degeneration resistor achieves better output matching and high linearity. Measurement results show that TIA provides a maximum DC transimpedance gain (ZT) of 74 dB

$\Omega $

while O/E.BW is beyond 40 GHz, the 50-ohm output buffer offers 580-mV output swing and PAM-4 electrical eye diagrams up to 56-Gbaud of optical receiver with PRBS31Q. The optical receiver achieves a sensitivity of −9.7-dBm optical modulation amplitude (OMA) at pre-FEC BER limit of

$2.4\times 10^{-4}$

operating 56-Gbaud PAM-4 SSPRQ and consumes 720mW with a power supply of 3.3 V.

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集成有 SiGe-BiCMOS TIA 的 4 × 56-Gbaud PAM-4 光接收器

为了支持线性驱动可插拔光学器件（LPO）和 400G 以上光链路所需的光接收器，本产品采用 0.13- $\mu $ m SiGe-BiCMOS 技术，在 fT/fMAX =260/350 GHz 的频率下集成了一个跨阻抗放大器（TIA），并采用板上芯片（COB）封装的四通道光接收器，展示了具有低噪声和高线性度的 56-Gbaud 四级脉冲幅度调制（PAM-4）。拟议的四级光接收器包括一个电感式分路反馈 TIA，其后是两个具有连续时间线性均衡器 (CTLE) 功能的可变增益放大器 (VGA)，以及一个 50 欧姆的输出缓冲器。TIA 中采用了 L-C 网络和电感分流反馈技术，以满足宽带宽（BW）和低噪声的规格要求。在 TIA 之后级联的两个具有 CTLE 功能的分流 VGA 级具有高可靠性，可以补偿光电二极管（PD）寄生电容造成的 BW 损失，并提供 -12dB ~ +18dB 的增益控制范围，以较低的群延迟变化适应高达 2mApp 的输入电流。带有 T 型线圈和变性电阻器的 50 欧姆输出缓冲器可实现更好的输出匹配和高线性度。测量结果表明，TIA 可提供 74 dB 的最大直流跨阻增益（ZT），而 O/E.BW 超过 40 GHz，50 欧姆输出缓冲器可提供 580 mV 的输出摆幅，PAM-4 电眼图可高达 56-Gbaud 的 PRBS31Q 光接收器。该光学接收器在使用 56-Gbaud PAM-4 SSPRQ 时，在 2.4 倍于 10^{-4}$ 的预 FEC BER 限制下，实现了 -9.7-dBm 光调制幅度 (OMA) 的灵敏度，在 3.3 V 电源下的功耗为 720mW。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.