Topic
Optical Transport Network
About: Optical Transport Network is a research topic. Over the lifetime, 6055 publications have been published within this topic receiving 85783 citations.
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TL;DR: A framework for estimating the quality of transmission (QoT) of a new lightpath before it is established, as well as for calculating the expected degradation it will cause to existing lightpaths, is developed based on a graph transformation that exposes and models the interference between spectrum-neighboring channels.
Abstract: We develop a framework for estimating the quality of transmission (QoT) of a new lightpath before it is established, as well as for calculating the expected degradation it will cause to existing lightpaths. The framework correlates the QoT metrics of established lightpaths, which are readily available from coherent optical receivers that can be extended to serve as optical performance monitors. Past similar studies used only space (routing) information and thus neglected spectrum, while they focused on old-generation noncoherent networks. The proposed framework accounts for correlation in both the space and spectrum domains and can be applied to both fixed-grid wavelength division multiplexing (WDM) and elastic optical networks. It is based on a graph transformation that exposes and models the interference between spectrum-neighboring channels. Our results indicate that our QoT estimates are very close to the actual performance data, that is, to having perfect knowledge of the physical layer. The proposed estimation framework is shown to provide up to 4 × 10-2 lower pre-forward error correction bit error ratio (BER) compared to the worst-case interference scenario,which overestimates the BER. The higher accuracy can be harvested when lightpaths are provisioned with low margins; our results showed up to 47% reduction in required regenerators, a substantial savings in equipment cost.
50 citations
Patent•
03 Apr 2011TL;DR: In this article, the authors describe a method to communicate over an optical network by using hop-by-hop routing over the optical network and dynamically constructing a network topology, and present a method for dynamically constructing the topology.
Abstract: Systems and methods are disclosed for a method to communicate over an optical network by using hop-by-hop routing over an optical network; and dynamically constructing a network topology.
50 citations
Patent•
22 Dec 1998TL;DR: In this article, the authors propose a method and apparatus for routing data packets via a synchronous optical (SONET) network from devices connected to a local area network to other local area networks.
Abstract: A method and apparatus for routing data packets via a synchronous optical (SONET) network from devices connected to a local area network to devices connected to other local area networks. At each transport node in the SONET network the data packets are unloaded from SONET payloads and requeued for transmission on an output path. This allows for easy resolution of contention between devices transmitting at the same time and avoids pre-assigning SONET channels. Source and destination address information from the data packets can be used to route the data packets through the SONET network. A time-to-live indicator can be used to find the shortest path to a destination address in a SONET ring network or any bi-directional ring network.
50 citations
Patent•
28 Oct 2005TL;DR: In this article, a communication recovering system for a WDM PON is proposed, which can rapidly recover optical fibers between a local office and optical network units, using 2×2 optical switches, which are installed to each of the optical unit, a reserved transmitter and receiver, and a transceiver.
Abstract: A communication recovering system for a wavelength division multiplexed passive optical network (WDM PON). The communication recovering system can recover fault of optical fibers between the central office and the remote nodes without additional optical fibers by grouping two remote nodes and employing an AWG having periodic transmission characteristics, and can also simply and rapidly recover such a fault with minimal optical loss using an AWG of 2×N structure and an On-Off optical switch, although protection optical fibers are additionally installed therein. The system can rapidly recover fault of optical fibers between a local office and optical network units, 1:N manner, using 2×2 optical switches, which are installed to each of the optical network units, a reserved transmitter and receiver, and a transceiver. The communication recovering system has advantages in that it can simplify network structure, be cost-effectively implemented, reduce optical loss, and rapidly perform protection of optical fiber fault.
50 citations
TL;DR: In this paper, forward error correction (FEC) is one of the key enabling elements in the 10/40 Gbps DWDM optical links, which heralds a new era of bandwidth abundance, in response to an explosive growth of services provided through the Internet.
Abstract: The recent establishment of the 10/40 Gbps technology in DWDM optical links heralds a new era of bandwidth abundance, in response to an explosive growth of services provided through the Internet. Forward error correction (FEC) is one of the key-enabling elements in this long-awaited achievement. Borrowed from the wireless world, FEC was initially introduced in wavelength-division multiplex (WDM) optical-systems to combat amplified spontaneous emission (ASE), a form of noise native in optical amplifiers (OAs). These first generation FEC systems have been associated with a coding-gain of approximately 6 dB. However, as transmission rates gradually scaled towards 10 Gbps, other optical-impairments gained in significance, primarily nonlinear (NL) effects but also chromatic-dispersion (CD) and polarization mode dispersion (PMD). FEC turned out to be invaluable in mitigating these impairments as well
50 citations