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Optical transmission systems using optical amplifiers and wavelength division multiplexing

A technology of optical amplifier and wavelength division multiplexing, which is applied in the field of optical transmission system, can solve the problem of damage to the availability of transmission circuits, and achieve the effect of reducing system cost

Inactive Publication Date: 2004-06-02
NORTEL NETWORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This severely impairs the availability of circuits transmitted within these signal

Method used

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  • Optical transmission systems using optical amplifiers and wavelength division multiplexing
  • Optical transmission systems using optical amplifiers and wavelength division multiplexing
  • Optical transmission systems using optical amplifiers and wavelength division multiplexing

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Embodiment Construction

[0047] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0048] WDM couplers or splitters are filters used to separate or combine optical signals according to their wavelengths. For example, WDM couplers are used to couple light from a laser source into the gain region of an EDFA. These couplers are useful within multi-channel optical systems, however, isolation requirements within WDM can be a serious problem due to multipath interference caused by imperfect isolation from the splitter. A three-port conventional WDM coupler can be used in configurations within the example shown in Figure 1A. Figure 1A illustrates a bidirectional connection between locations A and B, where the same optical fiber 1 is used for the channels at wavelengths λ1 and λ2. A WDM splitter 2 at position A connects the transmitter Tx1 to the fiber 1 via ports 4 and 3 , which WDM splitter 2 is used to transmit an optical signal S1 of wavelength λ1 on the fiber 1 . WDM splitter 2 also connects fiber 1 t...

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Abstract

An optical amplifier for a multi-channel optical transmission system is disclosed. A gain region of an optical amplifier is split into a forward path and a reverse path, each path being associated with a continuous transmission band. At least two first band signals are directed over the forward path and at least one second band signal is directed over the reverse path according to a wavelength of said respective signals. The wavelengths of the at least two first band signals are selected to have substantially similar gain tilt values.

Description

technical field [0001] The present invention is directed to an optical transmission system and method for transmitting information via an optical network, and more specifically to an optical transmission system and method using an optical amplifier and wavelength division multiplexing. Background technique [0002] The performance of standard span fiber limits the separation between the line termination equipment (LTE) and the regenerative equipment on dispersion-free or dispersion-shifted fiber to approximately 80 km (attenuation of 0.25 dB per km, total 20 dB). The 80 km limit is caused by the physical degradation of the transmitted optical signal due to dispersion and attenuation of light. Applying external modulation, dispersion-shifted optical fiber and optical amplifier technology, and wavelength division multiplexing (WDM) technology can make this limitation caused by dispersion and attenuation reach more than 80km. [0003] When designing a multiband transmission sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293H04B3/38H04B10/00H04B10/17H04B10/24H04B10/29H04J14/00H04J14/02
CPCH04J14/0241H04B10/2972H04J14/0283H04J14/0227H04J14/0291H04B10/2503H04J14/0221H04J14/0279H04B10/032H04B10/2589
Inventor K·B·罗伯特M·S·奥苏利范G·D·梅
Owner NORTEL NETWORKS LTD