Tunable optical second-order Volterra nonlinear filter using wave mixing and delays to equalize a 10–20 Gbaud 4-APSK channel

Kaiheng Zou*, Peicheng Liao, Huibin Zhou, Ahmad Fallahpour, Amir Minoofar, Ahmed Almaiman, Fatemeh Alishahi, Moshe Tur, Alan E. Willner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We experimentally demonstrate a tunable optical second-order Volterra filter using wave mixing and delays. Wave mixing is performed in a periodically poled lithium niobate waveguide with the cascaded sum-frequency generation and difference-frequency generation processes. Compared to conventional optical tapped delay line structures, second-order taps are added through the wave mixing of two signal copies. We measure the frequency response of the filter by sending a frequency-swept sinusoidal wave as the input. The tap weights are tuned with a liquid-crystal-on-silicon waveshaper for different filter configurations. With the additional second-order taps, the filter is able to perform a nonlinear function. As an example, we demonstrate the compensation of a nonlinearly distorted 10–20 Gbaud 4-amplitude and phase shift keying signal.

Original languageEnglish
Pages (from-to)1325-1328
Number of pages4
JournalOptics Letters
Volume46
Issue number6
DOIs
StatePublished - 15 Mar 2021

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