Abstract
Space division multiplexing (SDM), incorporating multi-core fibers (MCFs), has been demonstrated for effectively maximizing the data capacity in an impending capacity crunch. To achieve high spectral-density through multi-carrier encoding while simultaneously maintaining transmission reach, benefits from inter-core crosstalk (XT) and non-linear compensation must be utilized. In this report, we propose a proof-of-concept unified receiver architecture that jointly compensates optical Kerr effects, intra- and inter-core XT in MCFs. The architecture is analysed in multi-channel 512 Gbit/s dual-carrier DP-16QAM system over 800 km 19-core MCF to validate the digital compensation of inter-core XT. Through this architecture: (a) we efficiently compensates the inter-core XT improving Q-factor by 4.82 dB and (b) achieve a momentous gain in transmission reach, increasing the maximum achievable distance from 480 km to 1208 km, via analytical analysis. Simulation results confirm that inter-core XT distortions are more relentless for cores fabricated around the central axis of cladding. Predominantly, XT induced Q-penalty can be suppressed to be less than 1 dB up-to −11.56 dB of inter-core XT over 800 km MCF, offering flexibility to fabricate dense core structures with same cladding diameter. Moreover, this report outlines the relationship between core pitch and forward-error correction (FEC).
Highlights
With the advent of new smart phones, tablets and several communicating devices, we are entering in cloud computing era
In order to achieve the maximum performance from digital backward propagation (DBP), we initially optimize the number of calculation steps per fiber span
At 2 dBm signal launch power, Electronic dispersion compensation (EDC) gives the Q-factor of 7.45 dB, whereas the Q-factor after the post-processing of signals via DBP gradually increases with step-size
Summary
With the advent of new smart phones, tablets and several communicating devices, we are entering in cloud computing era. Numerous experiments have demonstrated the increment in spectral efficiency of fiber networks[6,7,8,9] These include the use of orbital angular momentum (OAM)[10,11], multi-mode based multiple-input multiple-output transmission (MIMO)[12,13] or either by implementing advanced modulation formats[14,15], such as m-ary quadrature amplitude modulation (QAM) and orthogonal frequency division multiplexing (OFDM)[16,17,18]. Coherent detection is considered efficient along with DSP to compensate many linear effects in fiber propagation i.e. chromatic dispersion (CD) It offers low required optical signal-to-noise ratio (OSNR).
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