IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543

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4-channel, 224 Gb/s PAM-4 optical transmitter with group delay compensation in 130-nm BiCMOS technology
Wentian FanYingmei ChenJiquan LiChao GuoEn Zhu
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JOURNAL FREE ACCESS Advance online publication

Article ID: 20.20230386

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Abstract

A compact 4-channel 224 Gb/s PAM4 optical transmitter in 130-nm SiGe BiCMOS technology is presented employing 3-tap feedforward equalizer (FFE) and continuous time linear equalizer (CLTE) techniques. One pre-emphasis tap and CLTE structures broadened the bandwidth to 26 GHz. Moreover, the peak-peak value of group delay for this system is reduced to 6.7 ps by adopting one pre-fall tap structure. The output stage employs current mode logic circuits to achieve high modulation currents. This chip occupies an area of 1.8 mm×1.95 mm with a 250 um channel pitch. An operating rate of 56 Gb/s/ch is achieved when inputting 28Gbaud PAM-4 signal. The single-ended output voltage amplitude is 240 mV, corresponding to 5.6 mA modulation currents.

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