Ring core fiber supporting orbital angular momentum for modal multiplexing

Leslie A. Rusch; Sophie Larochelle

doi:10.1117/12.2667522

30 May 2023 Ring core fiber supporting orbital angular momentum for modal multiplexing

Leslie A. Rusch, Sophie Larochelle

Proceedings Volume 12573, Specialty Optical Fibres; 125730I (2023) https://doi.org/10.1117/12.2667522
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

We design and characterize ring core fibers supporting orbital angular momentum modes; our fibers are produced in-house at Universit´e Laval. These fibers are tested in a transmission system test bed to demonstrate the wide range of exploitation strategies that are supported. When combining specialty fiber with integrated, silicon photonic multiplexers the costs are kept low, and multiplexed signals can be easily inserted into systems and technologies with tributaries for signal mode operation. We have demonstrated polarization maintaining operation on 12 data channels (6 modes) at 1.3 km that has the simplest digital signal processing. We used coherent detection of QPSK across the C-band, for a capacity of 40 Tb/s. When employing simple, commercially available 2-by-2 multiple-input, multiple-output processing the capacity can be increased to 65 Tb/s by suppressing polarization crosstalk. The performance of these fibers is best suited for short-distance links such as those in data centers. The ability to support a wide palate of modes gives flexibility; up to 12 simultaneous channels has already been demonstrated. Modes can be lit gradually as needed, or from initial deployment. The modes are polarization maintaining and very low crosstalk so that simple digital signal processing can be used. No multiple-input, multiple-output processing is required at distances under a kilometer. Our solutions are compatible with a migration from the current single-wavelength direct-detection approach to more aggressive, higher bandwidth systems. As data center technology moves to multiple wavelengths and/or coherent detection, the modal multiplexing with orbital angular momentum can provide the flexibility that is unattainable with scalar, linearly-polarized modal multiplexing.

Citation Download Citation

Leslie A. Rusch and Sophie Larochelle "Ring core fiber supporting orbital angular momentum for modal multiplexing", Proc. SPIE 12573, Specialty Optical Fibres, 125730I (30 May 2023); https://doi.org/10.1117/12.2667522

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KEYWORDS

Multiple input multiple output

Multiplexing

Angular momentum

Polarization

Crosstalk

Digital signal processing

Design and modelling

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