Long-haul optical transmission link using low-noise phase-sensitive amplifiers

Samuel L.I. Olsson (), Henrik Eliasson, Egon Astra, Magnus Karlsson and Peter A. Andrekson
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Samuel L.I. Olsson: Chalmers University of Technology
Henrik Eliasson: Chalmers University of Technology
Egon Astra: Tallinn University of Technology
Magnus Karlsson: Chalmers University of Technology
Peter A. Andrekson: Chalmers University of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract The capacity and reach of long-haul fiber optical communication systems is limited by in-line amplifier noise and fiber nonlinearities. Phase-sensitive amplifiers add 6 dB less noise than conventional phase-insensitive amplifiers, such as erbium-doped fiber amplifiers, and they can provide nonlinearity mitigation after each span. Realizing a long-haul transmission link with in-line phase-sensitive amplifiers providing simultaneous low-noise amplification and nonlinearity mitigation is challenging and to date no such transmission link has been demonstrated. Here, we demonstrate a multi-channel-compatible and modulation-format-independent long-haul transmission link with in-line phase-sensitive amplifiers. Compared to a link amplified by conventional erbium-doped fiber amplifiers, we demonstrate a reach improvement of 5.6 times at optimal launch powers with the phase-sensitively amplified link operating at a total accumulated nonlinear phase shift of 6.2 rad. The phase-sensitively amplified link transmits two data-carrying waves, thus occupying twice the bandwidth and propagating twice the total power compared to the phase-insensitively amplified link.

Date: 2018
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DOI: 10.1038/s41467-018-04956-5

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