Abstract
Transmission of highly spectral efficient 24.5 GBaud quadrature phase shift keying and 16- and 64-quadrature amplitude modulated signals in the S-band between 1492 nm and 1518 nm wavelength is demonstrated over 55 km few-mode fibers. The carrier lines for S-band transmission were generated by a single wideband optical comb source with more than 120 nm optical bandwidth. While the three-mode fiber was originally optimized for C- and L-band transmission, we show that differential mode delay and mode-dependent loss show only a minor wavelength dependence within the measured S-band channels. However, the transceiver sub-system, including S-band optical amplifiers as well as a reduced optical signal-to-noise ratio of the comb source, leads to a significant Q-factor penalty for channels towards the edges of the S-band optical amplifiers below 1495 nm and above 1515 nm wavelength.
Highlights
Space-division multiplexing (SDM) is an attractive technique to increase the per-fiber data-rates in optical transmission systems by transmitting independent data channels at the same wavelength over different spatial channels [1]
We have reported space-division multiplexed transmission in the S-band over 55 km few-mode fiber with wavelength channels between 1491.5 nm and 1517.9 nm
We have shown that the impulse response spread increases weakly towards lower wavelengths, with a total delay spread increase of less than 70 ps over the wavelength span of more than 25 nm
Summary
Space-division multiplexing (SDM) is an attractive technique to increase the per-fiber data-rates in optical transmission systems by transmitting independent data channels at the same wavelength over different spatial channels [1]. Ultra wideband wavelength-division multiplexed (WDM) or multi-band transmission beyond the C-band is discussed as an option to increase the data rates in standard single-mode fibers (SMF) [8,9,10]. A recent study combined uncoupled MCF with S-,C-, and L-band transmission, showing great potential of combining SDM with multi-band transmission for a total data rate of 0.61 Pb/s in a 125 micro-meter cladding diameter 4-core MCF [11]. We demonstrate transmission of quadrature phase shift keying (QPSK), 16-, and 64-quadrature amplitude modulated (QAM) signals over 55 km three-mode fiber. Being the first demonstration of S-band transmission in FMF, this study indicates no significant performance penalty resulting from transmission, while several components of the transceiver subsystems show a penalty compared to previous transmission experiments in C- and L-bands
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