Amplitude Modulation to Phase Modulation Conversion in Photonic Bandpass Sampling Link

Shanhong Guan; Feifei Yin; Yue Zhou; Kun Xu; Yitang Dai

doi:10.1109/JPHOT.2021.3098311

IEEE Photonics Journal (Jan 2021)

Amplitude Modulation to Phase Modulation Conversion in Photonic Bandpass Sampling Link

Shanhong Guan,
Feifei Yin,
Yue Zhou,
Kun Xu,
Yitang Dai

Affiliations

Shanhong Guan: ORCiD; State Key Laboratory of Information Photonics & Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China
Feifei Yin: State Key Laboratory of Information Photonics & Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China
Yue Zhou: State Key Laboratory of Information Photonics & Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China
Kun Xu: ORCiD; State Key Laboratory of Information Photonics & Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China
Yitang Dai: State Key Laboratory of Information Photonics & Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China

DOI: https://doi.org/10.1109/JPHOT.2021.3098311
Journal volume & issue: Vol. 13, no. 4
pp. 1 – 5

Abstract

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The photonic bandpass sampling has been proved to be potential in multi-carrier communication, frequency-agile coherent radar, compressive sensing, etc. It supports the direct down-conversion of multi-carrier signals using a low-speed analog-to-digital converter (ADC). We observed the distortion resulted from amplitude-modulation to phase-modulation (AM-PM) conversion caused by the saturated photo-detector in the photonic bandpass sampling link. The nonlinearity caused by the AM-PM conversion is theoretically analyzed, which is the 2nd harmonic distortion and has a phase difference of 90 degrees with the fundamental signal. Due to the AM-PM conversion, the 2nd harmonic distortion occurs even the Mach-Zehnder modulator (MZM) is quadrature biased in the photonic bandpass sampling link. Two comparative experiments were conducted to test the nonlinearity. When the MZM works at different bias points, the phase of the 2nd harmonic distortion will be different. In addition, we also compared the differences in 2nd harmonic distortion between standard continuous wave photonic links and photonic bandpass sampling links.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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