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Equalizer device, communication system and equalization method

A technology of equalizers and equalizer groups, applied in transmission systems, baseband systems, digital transmission systems, etc., and can solve problems such as increased loss and change in the inclination of optical curves.

Inactive Publication Date: 2020-10-20
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with maintenance and / or aging deterioration of submarine cable systems losses increase and thus the slope of the optical curve changes

Method used

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  • Equalizer device, communication system and equalization method
  • Equalizer device, communication system and equalization method
  • Equalizer device, communication system and equalization method

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Embodiment Construction

[0030] The exemplary embodiments will be described below using the drawings. Although technically preferable limitations for implementing the present invention are applied to the exemplary embodiments described below, the scope of the present invention is not limited thereto. In all the drawings used in the description of the following exemplary embodiments, the same or similar parts are given the same or similar reference signs unless there is a special reason. In the following example embodiments, repeated descriptions of similar configurations or operations may be omitted. The direction of the arrow in the drawing indicates an example, and does not limit the signal direction between blocks.

[0031] (First exemplary embodiment)

[0032] First, the tilt equalizer device according to the first exemplary embodiment of the present invention will be described with reference to the drawings. The tilt equalizer device (also referred to as an equalizer device) according to the presen...

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Abstract

In order to enable reducing the number of optical devices while maintaining a configured number of tilt levels, and to output an optical signal with a constant signal strength, this equalizer device is provided with: an optical matrix switch which comprises a first terminal group including at least two first terminals and a second terminal group including at least two second terminals; an equalizer group which includes at least two equalizers connected at the input terminal to one of the second terminals included in the second terminal group and connected at the output terminal to one of the first terminals included in the first terminal group; a variable attenuator which is connected to one of the second terminals included in the second terminal group and which attenuates an inputted optical signal; and a control means which switches the connection state between the first terminals and the second terminals and which sets the amount of attenuation in the variable attenuator.

Description

Technical field [0001] The present invention relates to an equalizer device, a communication system and an equalization method for equalizing the transmission characteristics of an optical signal. In particular, the present invention relates to an equalizer device, a communication system, and an equalization method for equalizing the inclination of an optical signal used in a submarine cable system. Background technique [0002] The submarine cable system needs to ensure the transmission quality of optical signals transmitted over long distances. In order to achieve the above object, it is desirable to flatten the inclination (0 dB) of the optical curve of the transmitted optical signal from the beginning of life (BOL) to the end of life (EOL). However, as the maintenance and / or aging of the submarine cable system deteriorates, the loss increases, and therefore the inclination of the optical curve changes. In order to keep the slope of the optical curve flat, a tilt equalizer d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/294H04B3/06
CPCH04B10/294H04B10/25073H04B10/2941H04L25/03878H04Q11/0005H04Q2011/0016H04Q2011/0035H04Q2011/0058
Inventor 种桥正夫
Owner NEC CORP