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 normalLP01 and normalLP11 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 GI‐FMF supports longer transmission distance for both normalLP01 and normalLP11 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.

Millimeter-wave enabled PAM-4 data transmission over hybrid FSO-MMPOF link for access networks

“…SMF has advantages over MMPOF in terms of bandwidth, dispersion, and attenuation, but the installation cost of SMF and single-mode transceivers is higher than MMPOF due to a need of trained people and high precision devices. In addition, MMPOF as compared to multimode glass optical fiber has smaller bending radius which makes its installation comparatively easy [12,13]. In the literature, a hybrid link-based architecture using 11 m FSO and 100 m MMPOF has been presented in [14] where the effects of fog and atmospheric turbulence for 11 m FSO link have been considered.…”

Probabilistic shaping communication system aided by neural network distribution matcher in data center optical network

“…The advantages of PS include adaptive rate, higher shaping gain, and no modification to constellation diagram. Facing the actual needs of the rapid development of optical data centers interconnection, 10–12 PS technology has become one of the possible solutions.…”