Work

18.6-THz long-haul transmission over G.654.E cutoff-shifted fiber across C + L + U + X-band within single-mode region

Year: 2025

Type: article

Abstract: 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.

Source: Optics Express

DOI: 10.1364/oe.574662