This paper introduces a novel method to simultaneously measure the cores of a multi-core fiber, enabling higher acquisition rates in shape sensing. The two-dimensional shape of the optical fiber is determined from the distributed strain measurements performed with the optical frequency domain reflectometry technique.
KEYWORDS: Multicore fiber, Spatial resolution, Acoustics, Signal processing, Biological and chemical sensing, Vibration, Telecommunication networks, Single mode fibers, Signal intensity, Roads
From Distributed Acoustic Sensing (DAS) measurements over deployed Multi-Core Fiber (MCF), we discuss several signal processing options to enhance the sensing sensitivity, namely core combination and longitudinal averaging.
Future quantum networks offer the potential for new communication and computation applications. These quantum networks will undoubtedly require the routing of quantum information between distant parties. In order to reliably achieve the transmission of entangled states over such a network, some entanglement distillation protocol can be implemented on an ensemble of entangled photon pairs. Here, we demonstrate such a protocol by recovering quantum information using local filters on each photon of a polarization-entangled state in the presence of a common source of decoherence in the telecom fiber infrastructure, polarization mode dispersion (PMD).
We present a study of nonlocal polarization-mode dispersion (PMD) compensation in the framework of quantum information theory. We consider distribution of polarization-entangled photon pairs through optical fibers, where PMD acts as a decoherence mechanism. The use of additional controlled PMD in one of the two optical paths can restore the original degree of entanglement fully or in part, depending on the system configuration, in a nonlocal fashion. Using the quantum analog of the Shannon entropy, the Von Neumann entropy, we evaluate the quantum mutual information of propagated polarization-entangled photon pairs as a function of the fiber-channel PMD, and quantify the beneficial effect of nonlocal PMD compensation in terms of mutual quantum information restoration. All the relevant quantities can be extracted from the reduced density matrix characterizing the twophoton state polarization, which is obtained experimentally by means of customary polarization tomography.
We review the principles underpinning the Kramers-Kronig (KK) receiver operation and its various implementations. These include direct-detection based schemes, where the information-carrying signal is transmitted along with a CW field that is necessary for the implementation of the KK algorithm, as well as other schemes, where the CW is added at the receiver, owing to the availability of a local oscillator. Polarization-multiplexing with the KK receiver will also be discussed. Finally, an up-to-date review of the experimental implementations of KK transceiver solutions will be presented.
We discuss the modeling of linear and nonlinear propagation in multi-mode optical fibers in the context of
optical communications. A generalized Stokes space representation is introduced for handling multi-mode fiber
propagation in the presence of mode coupling. Using this formalism, we define the modal dispersion vector and
characterize its statistics. We also show that nonlinear propagation in the presence of random mode coupling is
described by coupled multi-component Manakov equations, giving rise to interesting new physical phenomena.
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