Single parity check multi-core modulation for power efficient spatial super-channels

We investigate multi-core modulation formats for spatial super-channels using a single parity check on PDM-QPSK symbols. Compared to per-core PDM-QPSK, we show improvements in required OSNR of up to 1.8 dB, with minimal impact on spectral efficiency

Modulation formats for multi-core fiber transmission

©2014 Optical Society of America We investigate high dimensional modulation formats for multi-core fibers (MCFs) and spatial superchannels. We show that the low skew variations between MCF cores maybe exploited to generate 'multi-core' formats that offer significant advantages over independently transmitting conventional 4-dimensional formats in each core. We describe how pulse position modulation formats may be transposed to the spatial domain and then investigate a family of modulation formats referred to as core-coding, one of which has the same power and spectral efficiency as polarization switched quaternary phase shift keying but with half of the optical power, potentially improving non-linear tolerance for long distance transmission, albeit at the cost of implementation challenges. Finally, we investigate the application of set-partitioning to multi-core formats using a single-parity check bit transmitted in one quadrature of one polarization in one of the cores and polarization-division multiplexing quadrature phase shift keying data in all remaining cores. We observe that for high core counts, an advantage of almost 3 dB in asymptotic power efficiency may be obtained with negligible impact on spectral efficiency, which translates into experimentally measured reduction in the required optical signal-to-noise ratio of up to 1.8 dB at a bit-error-rate of 10-5 and the same data-rate, and additional transmission reach of up to 20%

Transmission of 138.9 Tb/s over 12 345 km of 125μm cladding diameter 4-core fiber using signals spanning S, C, and L-band

We demonstrate recirculating loop transmission of 4 × 518 × 24.5 GBd DP-QPSK signals spanning the S, C, and L-band over 12 345 km of 4-core fiber. T he t hroughput o f 138.9 T b/s results in the highest data-rate-distance product measured in any standard cladding diameter optical fiber

C + L-band seeded comb regeneration for MCF networks

We demonstrate C+L-band optical-frequency-comb regeneration from seed-signals that can be split, amplified, and transmitted over a novel metro/DC network architecture. Multi-core-fiber seed and data distribution with spatial-switching enables identical network-wide transceiver combs and ≈100 Tb/s/core and 600 Tb/s per-fiber data-rates

Modal Dispersion Mitigation in a long-haul 15-Mode Fiber link through Mode Permutation

We experimentally investigate a mode permutation scheme to mitigate differential mode delay impact in a long-haul 15-mode fiber link. The scheme reduces the rate of increase in the link's intensity impulse response duration with transmission distance, minimizing delay spread between wavelength channels across the C-band.</p