scispace - formally typeset
Search or ask a question
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.


Papers
More filters
Journal ArticleDOI
01 Jul 1997
TL;DR: Although optical clock distribution has not yet seen significant practical application, it is evident that the technical foundation for such clock distribution is well established and the practical advantages will also increase, limited primarily by the cost of the optical components used and the manufacturability of an overall electronic system in which optical Clock Distribution has been selectively inserted.
Abstract: Techniques for distribution of optical signals, both free space and guided, within electronic systems has been extensively investigated over more than a decade. Particularly at the lower levels of packaging (intra-chip and chip-to-chip), miniaturized optical elements including diffractive optics and micro-refractive optics have received considerable attention. In the case of optical distribution of data, there is the need for a source of optical power and a need for a means of modulating the optical beam to achieve data communications. As the number of optical data interconnections increases, the technical challenges of providing an efficient realization of the optical data interconnections also increases. Among the system signals which might be transmitted optically, clock distribution represents a substantially simplified problem from the perspective of the optical sources required. In particular, a single optical source, modulated to provide the clock signal, replaces the multitude of optical sources/modulators which would be needed for extensive optical data interconnections. Using this single optical clock source, the technical problem reduces largely to splitting of the optical clock beam into a multiplicity of optical clock beams and distribution of the individual clocks to the several portions of the system requiring synchronized clocks. The distribution problem allows exploitation of a wide variety of passive, miniaturized optical elements (with diffractive optics playing a substantial role). This article reviews many of the approaches which have been explored for optical clock distribution, ranging from optical clock distribution within lower levels of the system packaging hierarchy through optical clock distribution among separate boards of a complex system. Although optical clock distribution has not yet seen significant practical application, it is evident that the technical foundation for such clock distribution is well established. As clock rates increase to 1 GHz and higher, the practical advantages of optical clock distribution will also increase, limited primarily by the cost of the optical components used and the manufacturability of an overall electronic system in which optical clock distribution has been selectively inserted.

39 citations

Patent
09 Aug 2004
TL;DR: In this paper, a wavelength division multiplexing passive optical network including optical lines for link is described, where changes in the wavelength of each of the upstream optical signals are monitored and if there is an abnormality in each optical line by using relevant monitoring signals.
Abstract: A wavelength division multiplexing passive optical network including optical lines for link is disclosed. The passive optical network includes a plurality of optical network units each of which generates an upstream optical signal; a central office for generating downstream optical signals to be provided to each of the optical network units, and differentially converting each of the upstream optical signals into a monitoring signal and a received signal. Changes in the wavelength of each of the upstream optical signals are monitored and if there is an abnormality in each optical line by using relevant monitoring signals. The network also includes a remote node for multiplexing and outputting the upstream optical signals to the central office, and demultiplexing and outputting the downstream optical signals to corresponding optical network units.

39 citations

Proceedings ArticleDOI
23 May 2008
TL;DR: In this paper, an efficient heuristic is proposed, which can reduce 50%~70% PON network deployment costs compared to a benchmark sectoring approach, and can reduce the total cost of the network.
Abstract: We plan PON network deployment to minimize its total cost. An efficient heuristic is proposed, which can reduce 50%~70% PON network deployment costs compared to a benchmark sectoring approach.

39 citations

Journal ArticleDOI
TL;DR: This paper provides an overview ofForward error correction techniques for optical core and optical access networks, and highlights how coding and modulation can be best combined in optical core networks.
Abstract: Forward error correction (FEC) techniques are essential for optical core and optical access networks In optical core networks, the emphasis is on high coding gains and extremely low output bit error rates, while allowing decoder realizations to operate at a throughput of 100 Gb/s and above Optical access networks operate at 10 Gb/s or above and require low-complexity FEC codes with low power consumption Coherent optical transmission with higher order modulation formats will become mandatory to achieve the high spectral efficiencies required in next-generation core networks In this paper, we provide an overview of these requirements and techniques, and highlight how coding and modulation can be best combined in optical core networks We also present guidelines for modulation and low-complexity FEC system design for optical access networks

39 citations

Patent
26 Dec 2007
TL;DR: In this paper, the authors present byte-interleaving systems and methods for optical transport unit N (OTU4) and 100 Gb/s (100 G) optical transport enabling multi-level optical transmission.
Abstract: The present invention provides byte-interleaving systems and methods for Optical Transport Unit N (OTUN) (i.e. Optical Transport Unit 4 (OTU4)) and 100 Gb/s (100 G) optical transport enabling multi-level optical transmission. The byte-interleaving systems and methods of the present invention support the multiplexing of sub-rate clients, such as 10 Gb/s (10 G) clients, 40 Gb/s (40 G) clients, etc., into two 50 Gb/s (50 G) logical flows, for example, that can be forward error correction (FEC) encoded and carried on a single wavelength to provide useful, efficient, and cost-effective 100 G optical transport today. Signaling format support allows these two 50 G logical flows to be forward compatible with an evolving OTU4 and 100 G signaling format without waiting for optical and electronic technology advancement. Signaling format support also allows an evolving standard 100 G logical flow (i.e. OTU4, 100 Gb/s Ethernet (100 GbE), etc.) to be carried as 2×50 G logical flows, 4×25 G logical flows, or other lower rate formats on a single wavelength.

39 citations


Network Information
Related Topics (5)
Optical fiber
167K papers, 1.8M citations
86% related
Semiconductor laser theory
38.5K papers, 713.7K citations
84% related
Transmission (telecommunications)
171.3K papers, 1.2M citations
82% related
Photonics
37.9K papers, 797.9K citations
82% related
Network packet
159.7K papers, 2.2M citations
81% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202237
202132
202060
201998
201884