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access icon free Crosstalk estimation of 21.12 Tb/S Nyquist superchannels with hybrid modulation using trench-assisted multicore fibre

© The Institution of Engineering and Technology
Received 20/08/2018, Accepted 18/02/2019, Revised 14/01/2019, Published 18/02/2019

The transmission of 5 × 4.224 Tb/s Nyquist superchannels over 2688 km distance has been demonstrated using trench-assisted multicore fibre (TA-MCF) at different spans for the first time at reduced channel spacing. The channel spacing has been efficiently reduced from 32 GHz (before modulation) to 25 GHz (after modulation) using Nyquist superchannels with hybrid modulation to transmit 15 subcarriers in one superchannel without any distortion. Five Nyquist superchannels, each using 15 × 35.2 Gbaud PM-16QAM subcarriers (4.224 Tb/s), are transmitted over seven cores of TA-MCF with low crosstalk over the same distance. Further, by utilising the core-to-core rotation scheme, the inter-core crosstalk from the neighbouring cores has been reduced after WDM/SDM transmission.

Inspec keywords: optical crosstalk; optical fibre networks; quadrature amplitude modulation; space division multiplexing; wavelength division multiplexing

Other keywords: Nyquist superchannels; frequency 25.0 GHz; reduced channel spacing; hybrid modulation; size 2688.0 km; frequency 32.0 GHz; trench-assisted multicore fibre; superchannel; crosstalk estimation

Subjects: Optical fibre networks; Modulation and coding methods; Multiplexing and switching in optical communication

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