Dynamic RSA Problem for Time-Varying Traffic in Spectrum Sliced Elastic Optical Path Network

Abstract Service time-varying traffic flexible optical networks require a dynamic bandwidth allocation in order to follow the source transmission rate. The problem of service time-varying traffic, assuming that the set of connection requests is not known in advance, is considered in this work. Connection requests arrive randomly and have random durations. The considered dynamic RSA problem involves minimizing the probability of future connections blocking while maintaining spectrum continuity constraints and non-overlapping spectrum assignment constraints between spectrum-adjacent connections on the network links. The proposed algorithm determines the path with the required number of slots around the reference frequency for a connection request. An analysis of the network with time-varying traffic on the network connections was carried out on the basis of spectrum expansion/contraction schemes which allow to determine average blocking probability of the additional slot requests on these connections. The obtained results have been compared with those obtained by a well known algorithm that solves the dynamic RSA problem.

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RSA Problem for Varying Traffic in Flexible Optical Networks

Image Processing & Communications ◽

10.1515/ipc-2015-0004 ◽

2014 ◽

Vol 19 (1) ◽

pp. 35-44

Author(s):

Ireneusz Olszewski

Keyword(s):

Optical Networks ◽

Blocking Probability ◽

Routing Algorithm ◽

Dynamic Spectrum ◽

Spectrum Allocation ◽

Reference Frequency ◽

Time Varying ◽

Dynamic Spectrum Allocation ◽

Work Time ◽

Transparent Optical Networks

Abstract The problem of service time-varying traffic in flexible transparent optical networks, assuming that the incoming connections and their duration are not known in advance, is considered in this work. Time-varying traffic requires dynamic spectrum allocation for connections implemented in the network. In the considered problem, a path with the required spectrum around the reference frequency is determined for each incoming connection by the routing algorithm. In order to take into account the dynamic spectrum allocation for the connections in the network, two spectrum expansion/- contraction schemes have been applied on the basis of which the average blocking probability for the incoming request additional slot was determined.

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A Novel Spectrum Assignment Scheme for Time-Varying Traffic in Flexgrid Optical Networks

Journal of Optical Communications ◽

10.1515/joc-2016-0149 ◽

2018 ◽

Vol 39 (3) ◽

pp. 319-324

Author(s):

Fengqing Liu ◽

Yanfang Xu ◽

Shilin Xiao

Keyword(s):

Real Time ◽

Optical Networks ◽

Blocking Probability ◽

Numerical Results ◽

Time Varying ◽

Spectrum Assignment ◽

Assignment Scheme ◽

Flexgrid Optical Networks ◽

Over Time

Abstract In real-time communication, the bandwidth required by traffic may fluctuate over time, and the network should allocate spectrum flexibly to satisfy such demands. In this paper, a novel spectrum assignment scheme is proposed. It reduces the spectrum fragmentation by minimizing the number of spectrum-free windows and establishes a virtual sub-connection in a non-contiguous spectrum block for the incremental bandwidths of time-varying traffic, to eliminate the traffic relocation and interruption caused by traffic change. Numerical results demonstrate that the scheme proposed in this paper effectively reduces the network blocking probability, decreases the traffic interrupt ratio, and improves the performance of serving traffic.

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Polarization-transparent silicon photonic add-drop multiplexer with wideband hitless tuneability

Nature Communications ◽

10.1038/s41467-021-24640-5 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Francesco Morichetti ◽

Maziyar Milanizadeh ◽

Matteo Petrini ◽

Francesco Zanetto ◽

Giorgio Ferrari ◽

...

Keyword(s):

Optical Networks ◽

Communication Networks ◽

Bandwidth Allocation ◽

Core Networks ◽

Reconfigurable Devices ◽

Silicon Photonic ◽

Transmission Quality ◽

And Control ◽

Integrated Device ◽

Dynamic Bandwidth

AbstractFlexible optical networks require reconfigurable devices with operation on a wavelength range of several tens of nanometers, hitless tuneability (i.e. transparency to other channels during reconfiguration), and polarization independence. All these requirements have not been achieved yet in a single photonic integrated device and this is the reason why the potential of integrated photonics is still largely unexploited in the nodes of optical communication networks. Here we report on a fully-reconfigurable add-drop silicon photonic filter, which can be tuned well beyond the extended C-band (almost 100 nm) in a complete hitless (>35 dB channel isolation) and polarization transparent (1.2 dB polarization dependent loss) way. This achievement is the result of blended strategies applied to the design, calibration, tuning and control of the device. Transmission quality assessment on dual polarization 100 Gbit/s (QPSK) and 200 Gbit/s (16-QAM) signals demonstrates the suitability for dynamic bandwidth allocation in core networks, backhaul networks, intra- and inter-datacenter interconnects.

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