Differential phase-diversity electrooptic modulator for cancellation of fiber dispersion and laser noise

Ehsan Ordouie, Tianwei Jiang (), Tingyi Zhou, Farzaneh A. Juneghani, Mahdi Eshaghi, Milad G. Vazimali, Sasan Fathpour () and Bahram Jalali
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Ehsan Ordouie: University of Central Florida
Tianwei Jiang: University of California, Los Angeles
Tingyi Zhou: University of California, Los Angeles
Farzaneh A. Juneghani: University of Central Florida
Mahdi Eshaghi: University of Central Florida
Milad G. Vazimali: University of Central Florida
Sasan Fathpour: University of Central Florida
Bahram Jalali: University of California, Los Angeles

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Bandwidth and noise are fundamental considerations in all communication and signal processing systems. The group-velocity dispersion of optical fibers creates nulls in their frequency response, limiting the bandwidth and hence the temporal response of communication and signal processing systems. Intensity noise is often the dominant optical noise source for semiconductor lasers in data communication. In this paper, we propose and demonstrate a class of electrooptic modulators that is capable of mitigating both of these problems. The modulator, fabricated in thin-film lithium niobate, simultaneously achieves phase diversity and differential operations. The former compensates for the fiber’s dispersion penalty, while the latter overcomes intensity noise and other common mode fluctuations. Applications of the so-called four-phase electrooptic modulator in time-stretch data acquisition and in optical communication are demonstrated.

Date: 2023
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DOI: 10.1038/s41467-023-41772-y

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