Bismuth-doped fiber amplifier for full S-band amplification

Aleksandr Donodin; Vitaly Mikhailov; Jiawei Luo; Dmitrii Stoliarov; David J. DiGiovanni; Sergei K. Turitsyn

doi:10.1364/ol.575125

Bismuth-doped fiber amplifier for full S-band amplification

Aleksandr Donodin^*, Vitaly Mikhailov, Jiawei Luo, Dmitrii Stoliarov, David J. DiGiovanni, Sergei K. Turitsyn

^*Corresponding author for this work

OFS Laboratories

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Abstract

We report the first single-stage/single-pass bismuth-doped fiber amplifier (BDFA) achieving > 10 dB gain across the full S-band (1465–1530 nm), a critical step toward extending capacity in multi-band optical transmission systems. The proposed amplifier employs a 400 m-long germanosilicate fiber, bi-directionally pumped at 1425 nm, delivering 11.3–35.6 dB small-signal gain and a noise figure of 5.6–7.7 dB. Compared to thulium- and Raman-based S-band solutions, our BDFA offers a compact, efficient, and silica-compatible platform with improved performance in the lower S-band, where other technologies struggle. This demonstration paves the way for practical S-band amplification in future high-capacity, power-efficient optical networks without reliance on fluoride fibers or kilometer-scale nonlinear media.

Original language	English
Pages (from-to)	6369-6372
Number of pages	4
Journal	Optics Letters
Volume	50
Issue number	20
Early online date	13 Oct 2025
DOIs	https://doi.org/10.1364/ol.575125
Publication status	Published - 15 Oct 2025

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Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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10.1364/ol.575125Licence: CC BY 4.0

Bismuth-doped fiber amplifier for full S-band amplification
Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Final published version, 1.67 MBLicence: CC BY 4.0

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title = "Bismuth-doped fiber amplifier for full S-band amplification",

abstract = "We report the first single-stage/single-pass bismuth-doped fiber amplifier (BDFA) achieving > 10 dB gain across the full S-band (1465–1530 nm), a critical step toward extending capacity in multi-band optical transmission systems. The proposed amplifier employs a 400 m-long germanosilicate fiber, bi-directionally pumped at 1425 nm, delivering 11.3–35.6 dB small-signal gain and a noise figure of 5.6–7.7 dB. Compared to thulium- and Raman-based S-band solutions, our BDFA offers a compact, efficient, and silica-compatible platform with improved performance in the lower S-band, where other technologies struggle. This demonstration paves the way for practical S-band amplification in future high-capacity, power-efficient optical networks without reliance on fluoride fibers or kilometer-scale nonlinear media.",

author = "Aleksandr Donodin and Vitaly Mikhailov and Jiawei Luo and Dmitrii Stoliarov and DiGiovanni, {David J.} and Turitsyn, {Sergei K.}",

note = "Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article{\textquoteright}s title, journal citation, and DOI.",

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AU - Donodin, Aleksandr

AU - Mikhailov, Vitaly

AU - Luo, Jiawei

AU - Stoliarov, Dmitrii

AU - DiGiovanni, David J.

AU - Turitsyn, Sergei K.

N1 - Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

PY - 2025/10/15

Y1 - 2025/10/15

N2 - We report the first single-stage/single-pass bismuth-doped fiber amplifier (BDFA) achieving > 10 dB gain across the full S-band (1465–1530 nm), a critical step toward extending capacity in multi-band optical transmission systems. The proposed amplifier employs a 400 m-long germanosilicate fiber, bi-directionally pumped at 1425 nm, delivering 11.3–35.6 dB small-signal gain and a noise figure of 5.6–7.7 dB. Compared to thulium- and Raman-based S-band solutions, our BDFA offers a compact, efficient, and silica-compatible platform with improved performance in the lower S-band, where other technologies struggle. This demonstration paves the way for practical S-band amplification in future high-capacity, power-efficient optical networks without reliance on fluoride fibers or kilometer-scale nonlinear media.

AB - We report the first single-stage/single-pass bismuth-doped fiber amplifier (BDFA) achieving > 10 dB gain across the full S-band (1465–1530 nm), a critical step toward extending capacity in multi-band optical transmission systems. The proposed amplifier employs a 400 m-long germanosilicate fiber, bi-directionally pumped at 1425 nm, delivering 11.3–35.6 dB small-signal gain and a noise figure of 5.6–7.7 dB. Compared to thulium- and Raman-based S-band solutions, our BDFA offers a compact, efficient, and silica-compatible platform with improved performance in the lower S-band, where other technologies struggle. This demonstration paves the way for practical S-band amplification in future high-capacity, power-efficient optical networks without reliance on fluoride fibers or kilometer-scale nonlinear media.

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SP - 6369

EP - 6372

JO - Optics Letters

JF - Optics Letters

IS - 20

ER -

Bismuth-doped fiber amplifier for full S-band amplification

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