18.6-THz long-haul transmission over G.654.E cutoff-shifted fiber across C + L + U + X-band within single-mode region
We demonstrate ultra-wideband fiber-optic transmission over an ITU-T G.654.E-compliant cutoff-shifted single-mode fiber (CSF), which has low-loss and low-nonlinearity characteristics. By extending the transmission bandwidth to long wavelengths in the U-band and the extremely long wavelength band (X-band), a signal bandwidth reached 18.6 THz within 1530.53-1702.64 nm without using wavelengths below 1530 nm, the maximum cutoff wavelength defined in G.654.x. Using an optical inline lumped repeater combining erbium-doped fiber amplifiers and optical parametric waveband converters based on in-house periodically poled lithium niobate waveguides, we conducted an 80-km-span C + L + U + X-band lumped-amplified long-haul transmission up to 3040 km. We achieved net transmission capacity of 133.9 Tbps at 1040 km (13 × 80 km), 108.0 Tbps at 2000 km (25 × 80 km), and 87.6 Tbps at 3040 km (38 × 80 km). These results demonstrate that ultra-wideband transmission above 18 THz can be achieved using only the single-mode region of CSFs by extending bandwidth to long wavelengths with the support of inter-channel stimulated Raman scattering.
Authors
- Munehiko Nagatani (ORCID: https://orcid.org/0000-0003-2744-3058)
- Hitoshi Wakita (ORCID: https://orcid.org/0000-0001-9732-7111)
- Kosuke Kimura (ORCID: https://orcid.org/0009-0008-5586-6211)
- Hiroshi Yamazaki (ORCID: https://orcid.org/0000-0001-9434-2957)
- Shimpei Shimizu (ORCID: https://orcid.org/0000-0002-4687-8092)
- Masanori Nakamura (ORCID: https://orcid.org/0000-0003-1145-8036)
- Koji Enbutsu (ORCID: https://orcid.org/0000-0003-2462-0987)
- Takahiro Kashiwazaki (ORCID: https://orcid.org/0000-0002-4601-047X)
- Masashi Abe (ORCID: https://orcid.org/0000-0002-7841-0304)
- Yuta Shiratori (ORCID: https://orcid.org/0000-0002-1304-6484)
- Fukutaro Hamaoka (ORCID: https://orcid.org/0000-0003-4039-1862)
- Takayuki Kobayashi (ORCID: https://orcid.org/0009-0009-4788-8813)
- Takushi Kazama (ORCID: https://orcid.org/0000-0002-1000-8423)
- Takeshi Umeki (ORCID: https://orcid.org/0000-0002-5787-5911)
- Shunya Konno (ORCID: https://orcid.org/0000-0001-5805-5029)
- Yutaka Miyamoto
- Megumi Hoshi (ORCID: https://orcid.org/0009-0002-6910-9744)
- Hiroyuki Takahashi (ORCID: https://orcid.org/0000-0002-2409-1475)
- Akira Kawai (ORCID: https://orcid.org/0000-0002-1040-3706)
Institutions
- NTT (United States) (US)
Publication Details
- Journal
- Optics Express
- Published
- 2025-09-23
- DOI
- https://doi.org/10.1364/oe.574662
- Primary Topic
- Photonic and Optical Devices
- Type
- article
- Field-Weighted Citation Impact
- 0.00