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We show that quasi-single-mode transmission in few-mode fibers (FMFs) can reduce the number of spans for a fixed transmission distance and, consequently, the cost per bit for terrestrial transmission systems by minimizing both the Capex and Opex. The Gaussian-noise model is employed to estimate the nonlinear noise power spectral density both, which depends on the effective area of the FMF and span...
The emergence of 5G wireless and IoT (Internet of Things) technologies, as well as the continuous evolution of cloud computing is driving the need for easy and on-demand creation of end-to-end network services. We have developed an integrated system called the end-to-end network service orchestrator, which realizes seamless service orchestration across multiple on-premises and cloud infrastructures...
We propose a dynamically configurable optical impairment model for a physical layer abstraction enabling physical parameters learning in multi-vendor networks. We experimentally demonstrate quality of transmission prediction in mesh networks with 0.6 dB Q-factor accuracy.
We showcase demonstrations of "program & compile" styled optical networking as well as open platforms & standards based NFV service provisioning using a proof-of-concept implementation of the Software-Programmed Networking Operating System (SPN OS).
We present the SPN OS, a Network-as-a-Service orchestration platform for NFV/SDN integrated service provisioning across multiple datacenters over packet/optical networks. Our prototype showcases template-driven service function chaining and high-level network programming-based optical networking.
We show that 32 GBaud single- and multi-carrier DP-QPSK can deliver longer reach for the same capacity as 64 GBaud DP-QPSK. However, 64 GBaud multi-carrier DP-QPSK signal can provide 12% longer reach than single-carrier 32 GBaud DP-QPSK.
We demonstrate the effectiveness of multi-channel, format-agnostic, all-optical wavelength converters (AO-WCs) in improving network utilization. Simulations show doubled network utilization with significantly fewer AO-WCs and experiments confirm successful multichannel conversions over full operating wavelength range.
We analyze the availability of virtual optical networks (VONs) mapped over a physical optical network with correlated failures, and we propose a correlated-failure-aware VON mapping algorithm to support high availability while reducing the penalty cost and total link cost.
We consider virtual optical network (VON) mapping with the objective of minimizing total network link cost while guaranteeing VON availability, where VON availability is supported by providing shared backup path protection for selected VON links. We develop a matrix-based approach for calculating the availability of a VON mapping with shared backup path protection. In order to efficiently evaluate...
Orchestration across multiple domains is important for providing end-to-end services in software defined infrastructures. In this paper, we address the service function chain (SFC) mapping problem in a multi-domain network with nodes having different functions, i.e., service functions and/or switch functions. We present two different abstractions of the topology graph at the distributed orchestrators...
Optimization of optical network carrying mix of 1Tb/s 5sc-DP-16QAM and 400Gb/s 4sc-DP-QPSK superchannels reveals that subcarrier power pre-emphasis together with 12.5GHz guard band can maximize capacity-reach performance of each superchannel, while guard band alone can't.
Resiliency of the virtualization layer in software-defined optical networks is key for ondemand high-bandwidth services. We propose a resilient virtualization solution that can relax the reliability of physical optical nodes while providing highly-available services.
Spectral inversion can effectively mitigate intra-subcarrier nonlinear noise for uniform and non-uniform links, while inter-subcarrier nonlinear noise mitigation is more sensitive to the link symmetry. Spectral inversion mitigates significant nonlinear noise even with off-midspan placement.
We propose a simplified analytical model for the estimation of nonlinearity mitigation using spectral inversion. We demonstrate excellent agreement between analytical model and numerical simulations within a standard deviation of 0.2 dB Q-factor for five-subcarrier superchannel transmission over various uniform and non-uniform link configurations. The analytical model can enable fast and accurate...
We analyze the availability of virtual optical networks mapped over a physical substrate and propose VON mapping algorithms with selective dedicated protection to minimize cost while meeting availability requirements.
We propose a vertex-centric distributed resource orchestration algorithm for finding all feasible mappings of a service function chain in multi-domain networks. Simulation results show superior efficiency and scalability for computing large service function chain requests.
We propose an all-optical converter placement/wavelength assignment scheme to improve network utilization under practical constraints such as input wavelengths and cascadability. We show doubling of utilization compared to no conversion and 70% reduction in converters over OEO.
Computation of service function chains in multi-domain networks is critical for enabling the wide deployment of network function visualization for providing end-to-end network services. In this paper, we present a vertex-centric distributed orchestration framework for multi-domain networks, in which physical infrastructure information is maintained locally within each domain without infrastructure...
In this paper, we study the reliable virtual network mapping (RVNM) problem for allocating virtual machines (VMs) from multiple data centers (DCs) with the objective of maximizing the total reliability of a virtual network under two capacity constraints: computing capacity constraint at each DC and bandwidth capacity constraint on each link. We first describe graph models of RVNM, formulate the RVNM...
A compact (22.6 × 9.1 × 0.86 mm), 25-Gb/s, flexible printed circuit based optical transceiver module was developed. The module consists of a 25-μm-thick FPC substrate on which a vertical-cavity surface-emitting laser array, driver, photodiode array, and a transimpedance amplifier are mounted by flip-chip bonding. The polymer waveguide is laminated from the backside of the FPC via microlens-imprinted...
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