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IEEE/LEOS Summer Topical Meetings

Homogeneous, single-mode MCF transmission

Benjamin James Puttnam, Ruben Soares Luis, Jun Sakaguchi, Werner Klaus, José Manuel Delgado Mendinueta, Yoshinari Awaji, Naoya Wada

Published Jul 1, 2016• 0 citations
Publisher

Abstract

We discuss the possibility of multi Pb/s transmission using homogeneous, single-mode, multi-core fibers. We outline the key components of a recent demonstration, the consequences of fiber properties such as inter-core crosstalk and skew and potential for even greater efficiency from spatial-superchannel transmission.
DOI
10.1109/phosst.2016.7548811

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Optical multicore and multimode fibers (MCF/MMF) are promised to pace with the capacity crunch of back-bone networks by their spatial domain using space division multiplexing (SDM) [1]. Although multiple channels propagate within the same media in parallel, material inhomogenities and bendings induce inter- and intra-core crosstalk (XT), the compensation of which is crucial for long-haul SDM-fiber deployment [2]. In addition, the inherent XT provides random scattering to be exploited for physical layer security (PLS), either as physical un-clonable function (PUF) [3] or secret key generation (SKG) for end-to-end security [4], [5]. For both, SDM and PLS, the main challenge is to recover the spatial amplitude and phase contributions of each channel at the receiver-side in real-time, e.g. by digital signal processing (DSP). With increased number of SDM channels the computational effort in DSP-based channel diagonalization arises.
Quantum key distribution (QKD) is regarded as an alternative to traditional cryptography methods for securing data communication by quantum mechanics rather than computational complexity. Towards the massive deployment of QKD, embedding it with the telecommunication system is crucially important. Homogenous optical multi-core fibers (MCFs) compatible with spatial division multiplexing (SDM) are essential components for the next-generation optical communication infrastructure, which provides a big potential for co-existence of optical telecommunication systems and QKD. However, the QKD channel is extremely vulnerable due to the fact that the quantum states can be annihilated by noise during signal propagation. Thus, investigation of telecom compatibility for QKD co-existing with high-speed classical communication in SDM transmission media is needed. In this paper, we present analytical models of the noise sources in QKD links over heterogeneous MCFs. Spontaneous Raman scattering and inter-core crosstalk are experimentally characterized over spans of MCFs with different refractive index profiles, emulating shared telecom traffic conditions. Lower bounds for the secret key rates and quantum bit error rate (QBER) due to different core/wavelength allocation are obtained to validate intra- and inter-core co-existence of QKD and classical telecommunication.
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