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System for optical demultiplexing of wavelength bands

A technology of optical demultiplexer and demultiplexer, which is applied in the system field of improving band separation, and can solve the problems that the passband is not enough to effectively eliminate inter-band channels, cannot be used, and reduces the transmission capacity of optical fibers.

Inactive Publication Date: 2007-02-21
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

The passband is wide enough to cover the channels of the band (four channels in this example), but the passband is not selective enough to effectively eliminate the interband channels that make up bands 139 and 140
Therefore, these inter-band channels cannot be utilized, which significantly reduces the transmission capacity of the optical fiber

Method used

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  • System for optical demultiplexing of wavelength bands
  • System for optical demultiplexing of wavelength bands
  • System for optical demultiplexing of wavelength bands

Examples

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Embodiment Construction

[0021] exist figure 2 In the illustrated embodiment, multiplexed signal 200 is transmitted over optical fiber 205 . It consists of channels distributed at regular intervals. Multiplexed signal 200 includes two interleaved comb strips:

[0022] a first band comb band 321 is made up of three bands 321a, 321b, 321c, where each band consists of four channels of transmission signals; and

[0023] The second band comb band 320 is made up of two bands 320a and 320b, where each band is made up of two "inter-band" channels that are also used to transmit signals.

[0024] The system includes:

[0025] a first spectral demultiplexing stage with a relatively narrow passband and relatively high selectivity, the main function of which is to extract all inter-band band channels; and

[0026] A second spectral demultiplexing stage with a relatively wide passband and relatively low selectivity is used to separate the remaining bands after all inter-band channels have been extracted by the...

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Abstract

An optical demultiplexer system for separating adjacent wavelength bands without losing inter-band channels and comprising a first filter stage ( 210 ) of relatively narrow passband and relatively high selectivity in order to extract all of the inter-band channels. The first stage is followed by a second filter stage ( 240 ) of relatively broad passband and relatively low selectivity to extract the wavelength bands delivered by the first filter stage. Such a system makes it possible to use the inter-band channels, in particular for managing the network and the wavelength bands.

Description

technical field [0001] The present invention relates to optical fiber transmission technology using wavelength division multiplexing, and more particularly to a system for improving band separation in a transmission mode in which a large number of channels with the same destination are transmitted by sequences each having a different wavelength, and in the frequency spectrum, these wavelengths Regularly distributed and transmitted on the same fiber, these wavelengths make up so-called "bands". In other words, the spectral characteristics of the bands are like a comb of finite width with evenly spaced teeth. Multiple bands may intersect each other when the spectral spacing between two consecutive channels in the band is at least equal to the required spacing of the channels. Background technique [0002] In recent years, with the application of modern communication services, especially the Internet and its main application World Wide Web, private networks and wireless commun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02G02B6/34G02B6/293H04B10/00H04B10/27H04B10/29H04J14/00
CPCG02B6/29358G02B6/29386H04J14/02
Inventor 让-保罗·富尔阿诺·比松尼古拉·勒索兹
Owner ALCATEL LUCENT SAS
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