A 100-Gb/s, 1-tap feed-forward based analog equalizer for optical communication applications

This paper reports the design and measurement results of a 1-tap feed-forward based analog equalizer, mainly designed with differential pair amplifier cells composed of Indium Phosphide (InP) heterojunction bipolar transistors. This analog equalizer exhibits a maximal peaking frequency and amplitude of 50 GHz and 12 dB respectively. Large signal measurements demonstrated an equalization at 100 Gb/s of a 3m-long 1.85-mm-connector coaxial cable, which represents a lossy channel of 20 dB at 50 GHz. To the authors' knowledge, this is the first analog equalizer reported with an equalization capability demonstrated at 100 Gb/s.

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