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Communication node and switching device

A technology of a communication node and a switching device, which is applied in the directions of selection device, multiplexing communication, optical fiber transmission, etc., can solve the expensive cost of the optical transmission device, the increase of the cost of the optical transmission device, and the expensive volume of the optical signal sending device and the optical signal receiving device. And other issues

Inactive Publication Date: 2004-03-17
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Therefore, in the optical network disclosed in Japanese Patent Application Laid-Open No. Hei 10-336120 as in the case disclosed in Japanese Patent Application Laid-Open No. Hei 4-334135, since many optical components are required, the increase in the cost of the optical transmission device is inevitable
In addition, especially the optical signal transmitting device and the optical signal receiving device that can provide a transmission rate exceeding 10Gbps are very expensive and bulky, resulting in expensive cost of the optical transmission device

Method used

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  • Communication node and switching device
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  • Communication node and switching device

Examples

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no. 1 example

[0093] figure 1 is a block diagram showing the optical network system according to the first embodiment of the present invention. Such as figure 1 As shown, the optical network system of the first embodiment is composed of optical signal transceivers 101 and 102 , signal protection switches 201 and 202 , and optical fiber transmission lines 301 and 302 .

[0094] Each of the optical fiber transmission lines 301 and 302 is respectively installed on paths different from each other. Therefore, it is almost impossible for the transmission of the optical signals 401 and 402 to fail simultaneously on the two optical fiber transmission lines 301 and 302 .

[0095] Each of optical signal transceivers 101 and 102 has the same structure, and they transmit and receive optical signals 401 and 402 in directions opposite to each other. The optical signal transceiver 101 is composed of an optical signal transmitting section 111 and an optical signal receiving section 121 . The optical si...

no. 2 example

[0121] Figure 5 is a block diagram showing the structure of the optical network system according to the second embodiment of the present invention. Such as Figure 5 As shown, the optical network system of the second embodiment is composed of optical signal transceivers 101 , 102 , 103 and 104 , signal protection switches 601 and 602 and optical fiber transmission lines 301 and 302 .

[0122] Each optical fiber transmission line 301 and 302 is respectively set on a different path, so it is almost impossible for two optical fiber transmission lines 301 and 302 to have faults at the same time.

[0123] The structures of the optical signal transceivers 101, 102, 103 and 104 are the same. Optical signal transceivers 101 and 102 are placed in a form that can face each other and can transmit and receive optical signals to each other. Similarly, optical signal transceivers 103 and 104 are placed in a form facing each other and can transmit and receive optical signals to each othe...

no. 3 example

[0158] Figure 9 is a block diagram showing the structure of an optical network system according to a third embodiment of the present invention. Such as Figure 9 As shown, the optical network system of the third embodiment is a ring network, which has communication nodes 700-a, 700-b, 700-c and 700-d and optical fiber transmission lines 311, 312, 313 and 314.

[0159] The optical network system of the third embodiment has the following function, that is, when any one of the optical fiber transmission lines 311, 312, 313 or 314 breaks down, the original optical fiber transmission line 311, 312, 313 or 314 that has failed The transmitted optical signal starts to go around the faulty optical fiber transmission line 311 , 312 , 313 or 314 in the reverse direction in the optical fiber transmission line ( 311 , 312 , 313 or 314 ) arranged in a ring for transmission.

[0160] All communication nodes 700-a, 700-b, 700-c and 700-d have the same structure, only the wavelength of ligh...

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Abstract

An optical network system is provided which has a signal protection function and is able to be constructed of communication nodes manufactured at low costs. An optical signal transceiver has at least one optical signal transmitting device and at least one optical signal receiving device to transmit and receive an optical signal between nodes facing each other. A switching device, when no failure has occurred in the optical signal transmitting communication line and optical signal receiving communication line, transmits an optical signal from the optical signal transmitting device to an optical signal transmitting communication line and an optical signal having been received from the optical signal receiving communication line to an optical signal receiving device. The switching device, when a failure has occurred in the optical signal receiving communication line, does switching so as to be able to receive the optical signal, to be transmitted to the optical signal receiving device, from the optical signal transmitting communication line.

Description

technical field [0001] The present invention relates to a communication node and a switching device used in the communication node, in particular to a communication node that constitutes a large-capacity and high-speed optical network and has a signal protection function for optical signal communication lines in the high-speed optical network, and in the communication node Switching device used in . Background technique [0002] In traditional large-capacity and high-speed optical networks, an optical fiber transmission line can only transmit signals in one direction. [0003] Two optical fiber communication lines are required to transmit bidirectional signals of uplink and downlink signals between opposing communication devices. [0004] In addition, in order to provide a signal protection function against failure in the optical fiber communication line, two optical fiber communication lines are used for each of the uplink and downlink signals, one as the currently working...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/35G02B6/42H04B10/00H04B10/03H04B10/032H04B10/038H04B10/07H04B10/25H04B10/27H04B10/275H04B10/278H04B10/291H04J14/00H04J14/02
CPCH04J14/0291H04J14/0283G02B6/3562H04J14/0289G02B6/4246
Inventor 田岛章雄
Owner NEC CORP