Abstract
We report wavelength-division-multiplexed transmission of ninety 128-Gb/s polarization-multiplexed quadrature-phase-shift-keyed channels in a seamless 73 nm band over 60 × 100 km of ultra-large-area fiber. Co- and counter-pumped all-Raman amplification in the fiber spans, single-stage discrete Raman amplifiers, and broadband wavelength selective switch and channel equalizer were utilized to achieve optical signal-to-noise-ratio margin of more than 3 dB after 6000 km transmission of the 9 Tb/s capacity.
Highlights
A S CARRIERS attempt to continue to lower the cost-per-transmitted bit, research and development have concentrated on maximizing the benefits of coherent detection, in terms of obtaining the highest possible spectral efficiency
A seamless transmission band enabled by distributed Raman amplification avoids the band splitters and combiners required by systems with C+L erbium-doped fiber amplifiers (EDFA), simplifying the system configuration and potentially lowering cost
A tunable external cavity laser (ECL) having less than 100kHz linewidth served as the channel-under-test and was
Summary
A S CARRIERS attempt to continue to lower the cost-per-transmitted bit, research and development have concentrated on maximizing the benefits of coherent detection, in terms of obtaining the highest possible spectral efficiency. Typical C+L-band systems with erbium-doped fiber amplifiers (EDFA) utilize ∼70nm of bandwidth and require guard bands of 8 nm or more near 1565 nm, as recently reported in [1]. A seamless transmission band enabled by distributed Raman amplification avoids the band splitters and combiners required by systems with C+L EDFAs, simplifying the system configuration and potentially lowering cost. In the early 2000’s, there were several demonstrations of ultra-wide, continuous single-band transmission including 10G submarine systems with seamless transmission bandwidths up to 80 nm using all-Raman amplification [2] or hybrid
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