Spectrum Control through Discrete Frequency Diffraction in the Presence of Photonic Gauge Potentials

Chengzhi Qin, Feng Zhou, Yugui Peng, Dimitrios Sounas, Xuefeng Zhu, Bing Wang, Jianji Dong, Xinliang Zhang, Andrea Alù, and Peixiang Lu
Phys. Rev. Lett. 120, 133901 – Published 27 March 2018
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Abstract

By using optical phase modulators in a fiber-optical circuit, we theoretically and experimentally demonstrate large control over the spectrum of an impinging signal, which may evolve analogously to discrete diffraction in spatial waveguide arrays. The modulation phase acts as a photonic gauge potential in the frequency dimension, realizing efficient control of the central frequency and bandwidth of frequency combs. We experimentally achieve a 50 GHz frequency shift and threefold bandwidth expansion of an impinging comb, as well as the frequency analogue of various refraction phenomena, including negative refraction and perfect focusing in the frequency domain, both for discrete and continuous incident spectra. Our study paves a promising way towards versatile frequency management for optical communications and signal processing using time modulation schemes.

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  • Received 17 November 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.133901

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Chengzhi Qin1, Feng Zhou1, Yugui Peng1, Dimitrios Sounas2, Xuefeng Zhu1, Bing Wang1,*, Jianji Dong1,†, Xinliang Zhang1, Andrea Alù2,3,‡, and Peixiang Lu1,4,§

  • 1Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 2Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA
  • 3Advanced Science Research Center, City University of New York, New York, New York 10031, USA
  • 4Laboratory for Optical Information Technology, Wuhan Institute of Technology, Wuhan 430205, China

  • *wangbing@hust.edu.cn
  • jjdong@hust.edu.cn
  • aalu@gc.cuny.edu
  • §lupeixiang@hust.edu.cn

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Issue

Vol. 120, Iss. 13 — 30 March 2018

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