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Patent EP0766423A2 successfully refreshed from Google Patents.
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EP0766423A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Optical wavelength-division multiplexing transmission system

Assignee: NEC Corp
•
Filing: 1996-09-27
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Granted: —
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Expires: 2016-09-27
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Abstract

Abstract An optical wavelength-division multiplexing transmission system comprises an optical wavelength-division multiplexing transmitter 2, an optical wavelength-division multiplexing receiver 3, and a plurality of optical amplifiers 1 disposed on an optical transmission line connecting them. Optical filters are disposed on said optical transmission line for flattening pass band gain characteristics of predetermined number of optical amplifiers. It is desirable that one optical filter is disposed for every about 1 to 30 optical amplifiers 1. The optical wavelength-division multiplexing transmission system of the present invention can flatten accumulated gain characteristics of the optical amplifiers so that a plurality of optical signals with different wavelength can be transmitted without attenuation.

Inventors

  • 👤 Seiji c/o NEC Corporation Watanabe

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 17:38
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/29; H04B10/291; H04B10/293; H04B10/294; H04B10/2941; H04B10/2912; H04B10/2933; H04B10/2935

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 49 words
An optical wavelength-division multiplexing transmission system comprising an optical wavelength-division multiplexing transmitter, an optical wavelength-division multiplexing receiver, a plurality of optical amplifiers disposed on an optical transmission line and an optical filter disposed on said optical transmission line and for flattening pass band gain characteristics of said optical amplifiers.
Claim 2
Dependent Claim 25 words
An optical wavelength-division multiplexing transmission system as set forth in Claim 1, wherein said optical filter is disposed for every predetermined number of optical amplifiers.
Claim 3
Dependent Claim 28 words
An optical wavelength-division multiplexing transmission system as set forth in Claim 1 or Claim 2, wherein one optical filter is disposed for every 1 to 30 optical amplifiers.
Claim 4
Dependent Claim 32 words
An optical wavelength-division multiplexing transmission system as set forth in any preceding claim, wherein the optical filter is a fiber optic wavelength selection filter or a multilayered dielectric film optical interference filter.
Claim 5
Dependent Claim 24 words
An optical wavelength-division multiplexing transmission system as set forth in any preceding claim, wherein the optical amplifier is an Er doped fiber optics amplifier.
Claim 6
Dependent Claim 23 words
An optical repeater comprising an optical amplifier, and an optical filter for flattening pass band gain characteristics of predetermined number of optical amplifiers.
Claim 7
Dependent Claim 53 words
An optical wavelength-division multiplexing transmission system comprising an optical wavelength-division multiplexing transmitter, an optical wavelength-division multiplexing receiver, and a plurality of optical amplifiers disposed on an optical transmission line connecting them, wherein at least one of the plurality of optical amplifiers is disposed in an optical repeater as set forth in Claim 6.

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