Abstract
We experimentally investigate single-parity check (SPC) coded spatial superchannels based on polarization-multiplexed 16-ary quadrature amplitude modulation (PM-16QAM) for multicore fiber transmission systems, using a 7-core fiber. We investigate SPC over 1, 2, 4, 5 or 7 cores in a back-to-back configuration and compare the sensitivity to uncoded PM-16QAM, showing that at symbol rates of 20 Gbaud and at a bit-error-rate (BER) of 10-3, the SPC superchannels exhibit sensitivity improvements of 2.7 dB, 2.0 dB, 1.7 dB, 1.3 dB, and 1.1 dB, respectively. We perform both single channel and wavelength division multiplexed (WDM) transmission experiments with 22 GHz channel spacing and 20 Gbaud channel symbol rate for SPC over 1, 3 and 7 cores and compare the results to PM-16QAM with the same spacing and symbol rate. We show that in WDM signals, SPC over hl1 core can achieve more than double the transmission distance compared to PM-16QAM at the cost of 0.91 bit/s/Hz/core in spectral efficiency (SE). When sharing the parity-bit over 7 cores, the loss in SE becomes only 0.13 bit/s/Hz/core while the increase in transmission reach over PM-16QAM is 44 %.
Highlights
Coherent detection together with digital signal processing (DSP) has enabled the use of spectrally efficient multilevel modulation formats in optical communication systems
We experimentally investigate single-parity check (SPC) coded spatial superchannels based on polarization-multiplexed 16-ary quadrature amplitude modulation (PM-16QAM) for multicore fiber transmission systems, using a 7-core fiber
We have experimentally investigated modulation formats based on SPC over spatialsuperchannels consisting of 20 Gbaud PM-16QAM signals for long-haul multicore transmission systems
Summary
Coherent detection together with digital signal processing (DSP) has enabled the use of spectrally efficient multilevel modulation formats in optical communication systems. Quadrature phase shift keying (QPSK) is the most studied modulation format in coherent fiber optical communication systems. QPSK allows relatively low complexity transmitter, receiver and DSP design whilst enabling transmission over transoceanic distances. For more spectrally efficient systems, 16-ary quadrature amplitude modulation (16QAM) is often considered as it offers a doubled spectral efficiency (SE) compared to QPSK and can be implemented with reasonable complexity. To increase the throughput of a single fiber link, space-division multiplexing (SDM) technologies such as multicore fibers (MCFs) and multimode fibers have recently received a tremendous research attention. Other promising SDM technologies exist, such as multi-element fibers [5], multicore holey fibers [6] and multicore fibers with few-mode cores [7]
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