Abstract
The demand of delivering various services is driving inter-data centers optical interconnection towards 400 G/800 G, which calls for increasing capacity and spectrum efficiency. The aim of this study is to effectively increase capacity while also improving nonlinear noise anti-interference. Hence, this paper presents a state-of-the-art scheme that applies the K-means cluster algorithm in geometric shaping based on iterative polar modulation (IPM). A coherent optical communication simulation system was established to demonstrate the performance of our proposal. The investigation reveals that the gap between IPM and Shannon limit has significantly narrowed in terms of mutual information. Moreover, when compared with IPM and QAM using the blind phase searching under the same order at HD-FEC threshold, the IPM-16 using the K-means algorithm achieves 0.9 dB and 1.7 dB gain; the IPM-64 achieves 0.3 dB and 1.1 dB gain, and the IPM-256 achieves 0.4 dB and 0.8 dB gain. The robustness of nonlinear noise and high capacity enable this state-of-the-art scheme to be used as an optional modulation format not only for inter-data centers optical interconnection but also for any high speed, long distance optical fiber communication system.
Highlights
With the massive growth of cloud computing, 5G/6G, web-based applications, and other new types of services in recent years, the Internet traffic has been steadily expanding, which promotes optical interconnection networks (OINs) developing towards400 G/800 G [1,2]
The results show that when employing employing iterative polar modulation (IPM)-16 and QAM 16, the mutual information (MI) is almost the same at loop = 1 and 2
The state-of-the-art scheme that applied K-means cluster algorithm in geometric shaping based on iterative polar modulation has been proposed, which could be employed in OINs
Summary
With the massive growth of cloud computing, 5G/6G, web-based applications, and other new types of services in recent years, the Internet traffic has been steadily expanding, which promotes optical interconnection networks (OINs) developing towards400 G/800 G [1,2]. [5] proposed a method to realize a space-division multiplexing network in data center to overcome the optical network capacity crunch by using multi-core optical fiber. It performs effectively in data centers with short distances. The author of [6] proposed a novel multi-band approach based on intensity modulation and direct detection (IM/DD), which combines the use of carrier-less amplitude-phase (CAP). This strategy decreases the transceiver’s complexity, but it enhances spectrum efficiency. To narrow that gap within the constraints of optical signal-to-noise ratio (OSNR), constellation shaping is a promising technique [11]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call