Demonstration of QPSK data correlation and equalization using a tunable optical tapped delay line based on orbital angular momentum mode delays

Ahmed Almaiman, Hao Song, Amir Minoofar, Haoqian Song, Runzhou Zhang, Xinzhou Su, Kaiheng Zou, Kai Pang, Cong Liu, Peicheng Liao, Nanzhe Hu, Zhe Zhao, Shlomo Zach, Moshe Tur, Alan E. Willner

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate a tunable optical tapped delay line (OTDL) using delays based on orbital angular momentum (OAM) modes to perform data correlation and equalization for a quadrature phase-shift-keyed (QPSK) signal. The system: (i) creates N signal replicas as N taps on different OAM modes through mode multicasting, (ii) tunes the complex tap weights (i.e., amplitude and phase of the modes), (iii) applies a tunable mode-dependent delay to each replica, and (iv) coherently combines the taps in order to realize the OTDL functions of correlation and equalization. The experiment results: (i) identify the correlation occurrence of a sequence of 2 or 3 symbols in an incoming 10 or 20 Gbaud QPSK signal, and (ii) equalize the distortion caused by chromatic dispersion for a 20-Gbaud QPSK data signal and reduce error vector magnitude (EVM) from ∼25.4 to ∼12.9%.

Original languageEnglish
Article number127438
JournalOptics Communications
Volume503
DOIs
StatePublished - 15 Jan 2022

Keywords

  • Fiber optics
  • Fourier optics
  • Signal processing

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