期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 3, 页码 813-820出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3047670
关键词
Wavelength division multiplexing; L-band; Propagation losses; Optical fiber polarization; Loss measurement; Erbium-doped fiber amplifiers; Photonics; Coherent systems; hollow-core fiber; long-haul transmission; NANF
资金
- PhotoNext initiative of Politecnico di Torino
- CISCO SRA OPTSYS-2020
- European Research Council (ERC) [682724]
- EPSRC Airguide Photonics [EP/P030181/1]
- Lumenisity
- U.K. Royal Academy of Engineering
- EPSRC [EP/P030181/1] Funding Source: UKRI
The experiment conducted two transmission experiments using Nested-Antiresonant Nodeless (NANF) hollow-core fibers, achieving record transmission distances and observing no adverse effects from L-band interferers on the NANF. Progress in reducing NANF loss and inter-modal interference may make these fibers a promising alternative for next-generation higher-throughput fibers.
We report on two recirculating loop transmission experiments over a hollow-core fiber of the Nested-Antiresonant Nodeless type (NANF). We transmitted 61 channels in C-band at 32 GBaud, with either PM-QPSK or PM-16QAM modulation. In addition, 61 L-band interferers co-propagated in the NANF at all times, though they were not recirculated in the loop, to check for the presence of possible crosstalk effects between C and L-band in the NANF. The loop comprised the longest NANF transmission line yet constructed (7.72 km), as well as 55 km of pure-silica-core fiber (PSCF) needed to provide enough signal buffering and EDFA stabilization for the loop. The launch power into the PSCF was low enough to avoid generation of any significant non-linear noise. Using PM-QPSK, we achieved a record 618 km transmission in NANF (80 recirculations), at an overall average GMI of 3.44 bits/symb. Using PM-16QAM, we achieved a record 201 km transmission, at an overall average GMI of 7 bits/symb. We saw no adverse effect from the presence of L-band interferers in the NANF. If progress in the reduction of NANF loss and inter-modal interference continues at the rate of the last few years, these hollow-core fibers might become a promising alternative in the quest for next-generation higher-throughput fibers, given their theoretical potential of achieving low loss and ultra-low non-linearity over ultra-wide bandwidths, ideally bringing about a many-fold increase in throughput per fiber.
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