High-gain U-band discrete Raman amplifier for multi-band optical transmission systems

Dini Pratiwi; Daniele Orsuti; Mingming Tan; Ben J. Puttnam; Ruben S. Luis; Aleksandr Donodin; Ian Phillips; Luca Palmieri; Hideaki Furukawa; Wladek Forysiak

doi:10.1364/OL.582110

High-gain U-band discrete Raman amplifier for multi-band optical transmission systems

Dini Pratiwi
, Daniele Orsuti
, Mingming Tan
, Ben J. Puttnam
, Ruben S. Luis
, Aleksandr Donodin
, Ian Phillips
, Luca Palmieri
, Hideaki Furukawa
, Wladek Forysiak

Research output: Contribution to journal › Article › peer-review

Abstract

We experimentally demonstrate a set of U-band discrete Raman amplifiers using backward incoherent pumping in 1 km HNLF, achieving up to 22.3 dB net gain, and 4.2-5.8 dB NF. Three different types of Raman gain fiber have been investigated, including 1 km HNLF, 0.51 km HNLDSF, 8 km and 7.6 km IDF. Using HNLF achieved the highest gain and the lowest NF, while using 8 km IDF yielded up to 16.2 dB net gain and a minimum of 6.3 dB NF due to its low Raman gain coefficient and higher fiber loss. Using 0.51 km HNLDSF gave up to 21 dB net gain, but at a cost of over 8.1 dB noise figure. These amplifiers were incorporated in a C + L + U-band coherent transmission system using 516 × 24.5GBd DP-64/256QAM channels over 50 km SSMF. We achieved a maximum decoded data rate of 123.5Tb/s across C + L + U bands, with 25.6Tb/s specifically in the U-band (1625-1650 nm).

Original language	English
Pages (from-to)	181-184
Number of pages	4
Journal	Optics Letters
Volume	51
Issue number	1
Early online date	23 Dec 2025
DOIs	https://doi.org/10.1364/OL.582110
Publication status	Published - 1 Jan 2026

Bibliographical note

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of Optica Publishing Group. The paper can be found at the following URL on the Optica Publishing Group website: https://doi.org/10.1364/OL.582110. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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title = "High-gain U-band discrete Raman amplifier for multi-band optical transmission systems",

abstract = "We experimentally demonstrate a set of U-band discrete Raman amplifiers using backward incoherent pumping in 1 km HNLF, achieving up to 22.3 dB net gain, and 4.2-5.8 dB NF. Three different types of Raman gain fiber have been investigated, including 1 km HNLF, 0.51 km HNLDSF, 8 km and 7.6 km IDF. Using HNLF achieved the highest gain and the lowest NF, while using 8 km IDF yielded up to 16.2 dB net gain and a minimum of 6.3 dB NF due to its low Raman gain coefficient and higher fiber loss. Using 0.51 km HNLDSF gave up to 21 dB net gain, but at a cost of over 8.1 dB noise figure. These amplifiers were incorporated in a C + L + U-band coherent transmission system using 516 × 24.5GBd DP-64/256QAM channels over 50 km SSMF. We achieved a maximum decoded data rate of 123.5Tb/s across C + L + U bands, with 25.6Tb/s specifically in the U-band (1625-1650 nm).",

author = "Dini Pratiwi and Daniele Orsuti and Mingming Tan and Puttnam, \{Ben J.\} and Luis, \{Ruben S.\} and Aleksandr Donodin and Ian Phillips and Luca Palmieri and Hideaki Furukawa and Wladek Forysiak",

note = "This paper was published in Optics Letters and is made available as an electronic reprint with the permission of Optica Publishing Group. The paper can be found at the following URL on the Optica Publishing Group website: https://doi.org/10.1364/OL.582110. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.",

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AU - Orsuti, Daniele

AU - Tan, Mingming

AU - Puttnam, Ben J.

AU - Luis, Ruben S.

AU - Donodin, Aleksandr

AU - Phillips, Ian

AU - Palmieri, Luca

AU - Furukawa, Hideaki

AU - Forysiak, Wladek

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PY - 2026/1/1

Y1 - 2026/1/1

N2 - We experimentally demonstrate a set of U-band discrete Raman amplifiers using backward incoherent pumping in 1 km HNLF, achieving up to 22.3 dB net gain, and 4.2-5.8 dB NF. Three different types of Raman gain fiber have been investigated, including 1 km HNLF, 0.51 km HNLDSF, 8 km and 7.6 km IDF. Using HNLF achieved the highest gain and the lowest NF, while using 8 km IDF yielded up to 16.2 dB net gain and a minimum of 6.3 dB NF due to its low Raman gain coefficient and higher fiber loss. Using 0.51 km HNLDSF gave up to 21 dB net gain, but at a cost of over 8.1 dB noise figure. These amplifiers were incorporated in a C + L + U-band coherent transmission system using 516 × 24.5GBd DP-64/256QAM channels over 50 km SSMF. We achieved a maximum decoded data rate of 123.5Tb/s across C + L + U bands, with 25.6Tb/s specifically in the U-band (1625-1650 nm).

AB - We experimentally demonstrate a set of U-band discrete Raman amplifiers using backward incoherent pumping in 1 km HNLF, achieving up to 22.3 dB net gain, and 4.2-5.8 dB NF. Three different types of Raman gain fiber have been investigated, including 1 km HNLF, 0.51 km HNLDSF, 8 km and 7.6 km IDF. Using HNLF achieved the highest gain and the lowest NF, while using 8 km IDF yielded up to 16.2 dB net gain and a minimum of 6.3 dB NF due to its low Raman gain coefficient and higher fiber loss. Using 0.51 km HNLDSF gave up to 21 dB net gain, but at a cost of over 8.1 dB noise figure. These amplifiers were incorporated in a C + L + U-band coherent transmission system using 516 × 24.5GBd DP-64/256QAM channels over 50 km SSMF. We achieved a maximum decoded data rate of 123.5Tb/s across C + L + U bands, with 25.6Tb/s specifically in the U-band (1625-1650 nm).

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High-gain U-band discrete Raman amplifier for multi-band optical transmission systems

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