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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.


Papers
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Journal ArticleDOI
TL;DR: An optical regional access network which combines electronic IP routing with intelligent networking functionality of the optical WDM layer is described, which will enable efficient gigabit-per-second user access in next-generation Internet networks.
Abstract: We describe an optical regional access network which combines electronic IP routing with intelligent networking functionality of the optical WDM layer. The optical WDM layer provides such networking functions as network logical topology reconfiguration, optical flow switching to offload traffic and bypass IP routers, wavelength routing of signals, protection switching and restoration in the optical domain, and flexible network service provisioning by reconfigurable wavelength connectivity. We discuss key enabling technologies for the WDM layer and describe their limitations. The symbiosis of electronic and optical WDM networking functions also allows support for heterogeneous format traffic and will enable efficient gigabit-per-second user access in next-generation Internet networks.

87 citations

Journal ArticleDOI
TL;DR: This article describes the new architectures, components, and technologies of both new ROADM node architectures along with complementary optical components and technologies being synergistically designed, and how they work together to support these features in a compact and costefficient manner.
Abstract: Next-generation ROADM networks are incorporating an extensive range of new features and capabilities including colorless, directionless, and contentionless multiplexing and demultiplexing, flexible spectrum channel definition, and higher-order modulation formats. To efficiently support these new features, both new ROADM node architectures along with complementary optical components and technologies are being synergistically designed. In this article, we describe these new architectures, components, and technologies, and how they work together to support these features in a compact and costefficient manner.

86 citations

Patent
22 Aug 2002
TL;DR: In this article, the authors proposed a method for transporting signals between a base station hotel (400) and a remote cell site (402, 404, 406) allowing multiple uplink and downlink signals to be communicated using a single optical fiber.
Abstract: In a wireless communication network, a method for transporting signals between a base station hotel (400) and a remote cell site (402, 404, 406) allows multiple uplink and downlink signals to be communicated using a single optical fiber. In a preferred embodiment of the invention, an RF transport technique uses frequency translation to shift the common carrier frequencies of diversity and sector signals to distinct intermediate frequencies that are then combined, converted to an optical signal and transmitted over a single fiber. The RF transport technique also uses wavelength division multiplexing (WDM) to communicate both uplink and downlink signals over the same fiber. Reference clock signals are distributed to ensure accurate frequency translation at both ends of the link. Reference power signals are also transmitted in both uplink and downlink to help perform signal power equalization.

86 citations

Journal Article
TL;DR: Optical code division multiplexing (OCDM) is the other class of multiple-access techniques than TDM, WDM, and SDM and has been proposed in mid-1970s.
Abstract: Optical code division multiplexing (OCDM) is the other class of multiplexing techniques than time division multiplexing (TDM), wavelength division multiplexing (WDM) and space division multiplexing (SDM). OCDM has been proposed in mid ’70s. It has been long since OCDM remains outside the mainstream of research community of optical communications, however, possible scarcity of the wavelength resource in future photonic networks, the simple access protocol as well as versatility of optical codes motivate recent growth of OCDM research activities. In this paper, first, fundamentals of OCDM concept are presented, highlighting optical encoding and optical time gate detection which realize time spreading/despreading. Next, current research activities of OCDM are reviewed by focusing particularly on the optical implementations and the proof-of-concept experiments. It is devoted to three categories; high bit rate pointto-point transmissions, gigabit multiple access, followed by optical path networks using optical code. Finally, future issues are briefly summarized. key words: optical communications, code division multiplexing, wireless CDMA, multiple access, optical network

86 citations

Patent
13 Feb 2004
TL;DR: In this article, the authors proposed a fiber optic communication system with robust security and which can be stably operated even at the time of failure at low cost, which can also realize flexible network design, construction, and operation.
Abstract: A fiber optic communication system includes a device of switching and setting wavelength of optical signals used in communication by network-node equipments, which sets the mapping of the wavelength of the optical signal used in communication by the network node equipments, and the input/output ports of an array waveguide grating (AWG), so as to construct a predetermined logical network topology by a plurality of network node equipments which are connected via optical fibers to the array waveguide grating that outputs optical signals inputted to optical input ports, to predetermined optical output ports in accordance with the wavelength thereof. As well as enabling a simple construction, it is easy to realize flexible network design, construction, and operation, and different network groups can also be easily connected to each other. Moreover, a fiber optic communication system having robust security and which can be stably operated even at the time of failure is realized at low cost.

84 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202237
202132
202060
201998
201884