Hybrid optical fiber architecture combining orbital angular momentum of photons and spatial domain multiplexing with wavelength division multiplexing for higher data rates

Lots of research efforts have been devoted to increase the transmission capacity in optical communications using orbital angular momentum (OAM) multiplexing. To enable long-haul OAM mode transmission, an in-line OAM fiber amplifier is desired. A ring-core fiber (RCF) is considered to be a preferable design for stable OAM mode propagation in the fiber. Here, we demonstrate an OAM fiber amplifier based on a fabricated ring-core erbium-doped fiber (RC-EDF). We characterize the performance of the RC-EDF-assisted OAM fiber amplifier and demonstrate its use in OAM multiplexing communications with OAM modes carrying quadrature phase-shift keying (QPSK) and quadrature amplitude modulation (QAM) signals. The amplification of two OAM modes over four wavelengths is demonstrated in a data-carrying OAM-division multiplexing and wavelength-division multiplexing system. The obtained results show favorable performance of the RC-EDF-assisted OAM fiber amplifier. These demonstrations may open up new perspectives for long-haul transmission in capacity scaling fiber-optic communications employing OAM modes.

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Data Transmission using Orbital Angular Momentum Mode Multiplexing and Wavelength Division Multiplexing with a Silicon Photonic Integrated MUX Chip

10.1109/ecoc52684.2021.9606096 ◽

2021 ◽

Author(s):

Yaoxin Liu ◽

Lars Sogaard Rishoj ◽

Michael Galili ◽

Yunhong Ding ◽

Leif Katsuo Oxenlowe ◽

...

Keyword(s):

Angular Momentum ◽

Orbital Angular Momentum ◽

Wavelength Division Multiplexing ◽

Data Transmission ◽

Wavelength Division ◽

Silicon Photonic ◽

Momentum Mode

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Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

Nature Communications ◽

10.1038/s41467-021-24409-w ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Georg Rademacher ◽

Benjamin J. Puttnam ◽

Ruben S. Luís ◽

Tobias A. Eriksson ◽

Nicolas K. Fontaine ◽

...

Keyword(s):

Wavelength Division Multiplexing ◽

Single Mode ◽

Single Mode Fiber ◽

Capacity Limits ◽

Wavelength Division ◽

Core Networks ◽

Space Division Multiplexing ◽

Space Division ◽

Data Rates ◽

Multi Mode

AbstractData rates in optical fiber networks have increased exponentially over the past decades and core-networks are expected to operate in the peta-bit-per-second regime by 2030. As current single-mode fiber-based transmission systems are reaching their capacity limits, space-division multiplexing has been investigated as a means to increase the per-fiber capacity. Of all space-division multiplexing fibers proposed to date, multi-mode fibers have the highest spatial channel density, as signals traveling in orthogonal fiber modes share the same fiber-core. By combining a high mode-count multi-mode fiber with wideband wavelength-division multiplexing, we report a peta-bit-per-second class transmission demonstration in multi-mode fibers. This was enabled by combining three key technologies: a wideband optical comb-based transmitter to generate highly spectral efficient 64-quadrature-amplitude modulated signals between 1528 nm and 1610 nm wavelength, a broadband mode-multiplexer, based on multi-plane light conversion, and a 15-mode multi-mode fiber with optimized transmission characteristics for wideband operation.

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