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  • Received: Oct. 2, 2020

    Accepted: Dec. 2, 2020

    Posted: Dec. 3, 2020

    Published Online: Jan. 14, 2021

    The Author Email: He Wen (he.wen@creol.ucf.edu)

    DOI: 10.1364/PRJ.411529

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    He Wen, Yuanhang Zhang, Rachel Sampson, Nicolas K. Fontaine, Ning Wang, Shengli Fan, Guifang Li. Scalable non-mode selective Hermite–Gaussian mode multiplexer based on multi-plane light conversion[J]. Photonics Research, 2021, 9(2): 02000088

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Photonics Research, Vol. 9, Issue 2, 02000088 (2021)

Scalable non-mode selective Hermite–Gaussian mode multiplexer based on multi-plane light conversion

He Wen1,*, Yuanhang Zhang1, Rachel Sampson1, Nicolas K. Fontaine2, Ning Wang1, Shengli Fan1, and Guifang Li1

Author Affiliations

  • 1CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, Florida 32816-2700, USA
  • 2Bell Laboratories, Alcatel-Lucent, Holmdel, New Jersey 07733, USA

Abstract

Non-mode-selective (NMS) multiplexers (muxes) are highly desirable for coherent power combining to produce a high-power beam with a shaped profile (wavefront synthesis) from discrete, phase-locked emitters. We propose a design for a multi-plane light conversion (MPLC)-based NMS mux, which requires only a few phase masks for coherently combining hundreds of discrete input beams into an output beam consisting of hundreds of Hermite–Gaussian (HG) modes. The combination of HG modes as a base can further construct a beam with arbitrary wavefront. The low number of phase masks is attributed to the identical zero-crossing structure of the Hadamard-coded input arrays and of the output HG modes, enabling the practicality of such devices. An NMS mux supporting 256 HG modes is designed using only seven phase masks, and achieves an insertion loss of -1.6 dB, mode-dependent loss of 4.7 dB, and average total mode crosstalk of -4.4 dB. Additionally, this design, featuring equal power for all input beams, enables phase-only control in coherent power combining, resulting in significant simplifications and fast convergence compared with phase-and-amplitude control.

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