Linearly polarised modes enabled PAM-4 data transmission over few-mode fibre for data centre interconnect

Abstract

This Letter proposes a high data rate optical transmission system for data centre interconnects, where the authors employ vertical cavity surface emitting lasers (VCSEL) and graded index few-mode fibre (GI-FMF) having modal bandwidth of around 24.3 GHz.km to enhance the link capacity and range. Additionally, they consider PAM-4 modulated data transmission at the rate of 2×100 Gbps using a pair of VCSELs and employing mode group division multiplexing of two linearly polarised (LP) modes LP01 and LP11 of the GI-FMF. Digital signal processing techniques are applied at the receiver to process the received PAM-4 signals for equalisation in order to mitigate the channel impairments. Furthermore, standard OM3 and OM4 fibres are considered as a benchmark to compare the transmission performance of the designed GI-FMF. They observe that the designed GIFMF supports longer transmission distance for both LP01 and LP11 modes upto 900 and 450 m at 50 and 100 Gbps data rates, respectively, while achieving lower receiver sensitivities for forward error correction limit of 3.8 × 10-3. The proposed optical transmission system can be a potential applicant in future data centre networks supporting transmission rates in 800 Gbps to 1.6 Tbps range.

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