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Optical network

外国特許コード F170009050
整理番号 J1020-12WO
掲載日 2017年4月26日
出願国 アメリカ合衆国
出願番号 201515122289
公報番号 20160373841
出願日 平成27年2月12日(2015.2.12)
公報発行日 平成28年12月22日(2016.12.22)
国際出願番号 JP2015053872
国際公開番号 WO2015129472
国際出願日 平成27年2月12日(2015.2.12)
国際公開日 平成27年9月3日(2015.9.3)
優先権データ
  • 特願2014-039190 (2014.2.28) JP
  • 2015JP53872 (2015.2.12) WO
発明の名称 (英語) Optical network
発明の概要(英語) An optical network transmits a wavelength division multiplexing optical signal from a transmission to a reception node via a reconfigurable optical add/drop multiplexer and/or path cross-connect apparatuses.When optical or optical super channels made of successive optical subcarriers input from input optical fibers are routed or switched to an output optical fiber in the multiplexer and/or apparatus passed through by a wavelength division multiplexing optical signal transmitted from the predetermined transmission node to the predetermined reception node, the adjacent channels output to the same output fiber in each input fiber is collectively demultiplexed without being demultiplexed for the channels and is routed or switched to the output fiber.Channel routing paths and frequency arrangements are controlled such that the number of filtering times by a wavelength division filtering mechanism on one or both sides on the frequency axis of the channel becomes equal to or less than a predetermined value.
従来技術、競合技術の概要(英語) BACKGROUND ART
An optical network is known that transmits wavelength division multiplexed (WDM) lights including multiple wavebands each consisting of multiplexed optical channels (wavelength channels) of a predetermined bit rate on the order of GHz to THz for each of multiple wavelengths respectively corresponding to multiple optical (wavelength) channels (wavelength channels or light paths) divided based on wavelength by, for example, 100 GHz in a predetermined communication wavelength band, from a predetermined optical node to a plurality of other optical nodes through respective multiple optical fibers in series or in parallel among optical nodes.In such an optical network, an optical path cross-connect apparatus making up each optical node routes optical channels on the basis of wavelengths making up wavelength division multiplexed optical signals transmitted through optical fibers by using the wavelengths as labels to be routed to desired routes (destinations) directly as optical signals through optical paths on the basis of wavelengths, thereby implementing large-capacity transmission with low power consumption.
Because a traffic amount is predicted to increase at an accelerated rate in the optical network due to the recent deployment of ADSL and FTTH and the deployment of services such as high-definition moving image distribution, it is desired to increase the available numbers of wavelength paths and optical fibers and to further increase the scale of optical path cross-connect apparatuses making up nodes in the optical network.
特許請求の範囲(英語) [claim1]
1. An optical network transmitting a wavelength division multiplexing optical signal from a predetermined transmission node to a predetermined reception node via one or more reconfigurable optical add/drop multiplexer and/or optical path cross-connect apparatuses, wherein
when optical channels or optical super channels made up of successive optical subcarriers input from any of input optical fibers are routed or switched to one or more output optical fibers in at least one of the reconfigurable optical add/drop multiplexer and/or the optical path cross-connect apparatus passed through by a wavelength division multiplexing optical signal transmitted from the predetermined transmission node to the predetermined reception node, a plurality of optical channels or optical super channels adjacent to each other on a frequency axis output to the same output optical fiber in each input optical fiber is collectively demultiplexed without being demultiplexed for respective optical channels or optical super channels and is routed or switched to the output optical fiber, and wherein
routing paths and frequency arrangements of the optical channel or the optical super channel as well as optical channels or optical super channels terminated at path-through nodes located on the way are controlled such that the number of times of filtering by a wavelength division filtering mechanism on one or both sides on the frequency axis of the optical channel or the optical super channel becomes equal to or less than a predetermined value.
[claim2]
2. The optical network according to claim 1, wherein
when any one of the optical channels or the optical super channels is routed or switched from the transmission node through a plurality of nodes to the reception node, and a plurality of optical channels or optical super channels adjacent to each other on the frequency axis including an optical channel output to the same output optical fiber in each input optical fiber or dropped at the reception node is collectively demultiplexed without being demultiplexed for respective optical channels or optical super channels and is routed or switched to the output optical fiber, filtering of an optical signal for dropping is permitted only for the optical channel or the optical super channel to be dropped at the reception node.
[claim3]
3. The optical network according to claim 1, wherein
a plurality of optical channels or optical super channels in a constant width on the frequency axis is collectively routed from the input optical fibers to the output optical fibers at the path-through node, wherein filtering of an optical signal is permitted for the optical signal terminated at the path-through node, and wherein one or more said constant widths are used in the optical network.
[claim4]
4. The optical network according to claim 3, wherein
arrangements of plurality of frequency bands in said one or more constant widths used in the optical network are kept unique in the optical network.
[claim5]
5. The optical network according to claim 3, wherein
in the case of static design in which the optical network is designed by giving a traffic demand, a route and a frequency arrangement of an optical channel or an optical super channel in the optical network are searched for and assigned such that the number of drop processes of adjacent optical channels at a predetermined node is minimized or becomes equal to or less than a predetermined value with respect to the optical channel or the optical super channel accommodated in a bundle of optical channels or optical super channels having a constant width on the frequency axis.
[claim6]
6. The optical network according to claim 1, wherein
a plurality of optical channels or optical super channels is collectively routed as a bundle with a constant width on the frequency axis from input optical fibers to output optical fibers at a path-through node located on the way, and wherein the optical channels or the optical super channels are separately routed or switched in a frequency band in which the bundle is not set.
[claim7]
7. The optical network according to claim 3, wherein
in the case of dynamic design in which an optical channel or an optical super channel is accommodated in the optical network each time a demand occurs, a route or a frequency of a demanded optical channel is searched for and assigned such that the number of drop processes at a node is minimized or becomes equal to or less than a predetermined value with respect to the demanded optical channel or optical super channel as well as existing adjacent optical channels or optical super channels when a route or a frequency is assigned to a newly arriving demand.
  • 発明者/出願人(英語)
  • SATO Ken-ichi
  • HASEGAWA Hiroshi
  • MORI Yojiro
  • TERADA Yuki
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
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