Unlock instant, AI-driven research and patent intelligence for your innovation.

Control scheme for long wavelength channels in wideband WDM optical fiber transmission system

An optical transmission medium and wavelength technology, which is applied in wavelength division multiplexing systems, optical transmission systems, electromagnetic wave transmission systems, etc., and can solve the problems of output power drop and no power transfer.

Inactive Publication Date: 2004-03-24
FUJITSU LTD
View PDF1 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] However, in wideband systems, interruption of operation of the short wavelength channels (due to failure or for maintenance purposes) or a reduction in the number of active short wavelength channels results in less or no power transfer to the G and L band signals
As a result, C and L band signal output power drops and OSNR degrades, making these channels more prone to errors

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control scheme for long wavelength channels in wideband WDM optical fiber transmission system
  • Control scheme for long wavelength channels in wideband WDM optical fiber transmission system
  • Control scheme for long wavelength channels in wideband WDM optical fiber transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0062] First, a description of the principle of the present invention will be given below.

[0063] According to the first aspect of the invention, an additional Raman pump source is provided in the amplifier stage. These light sources are switched off when the S+ and S bands are fully used in service. Depending on the position of the diode, this control signal is to be used to switch on / off the replacing Raman pump laser diode in the same transponder node or in the previous or next node. The photodiode can be located before or after the amplifier. Thus, reliable C / L-band transmission can be maintained without full operation of S+ and S-band channels.

[0064] see Image 6 , without all or part of the S+ and / or S-band channels, power transfer from shorter to longer wavelengths is reduced or completely interrupted. As a result, the power of the C and L-band channels drops, and the OSNR drops, causing these channels to have a higher probability of error. Therefore, a backup...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

There is provided in an optical amplifier device used for a system in which a power transfer takes place from comparatively short wavelength signal to a comparatively long wavelength signal. The device includes an amplifier stage coupled to an optical transmission medium, a monitor monitoring a status of a first band; and a pump light source unit supplying at least one first pump light to the optical transmission medium on the basis of the status of the first band monitored, so that the above at least one first pump light supplies additional power to longer wavelength channels related to the status of the first band.

Description

technical field [0001] The present invention relates to wideband WDM (wavelength division multiplexing) transmission systems and protection schemes against loss of short wavelength signals in such systems. Background technique [0002] An existing optical communication system includes a transmitting end for generating a WDM optical signal formed by wavelength division multiplexing of a plurality of optical signals of different wavelengths, an optical transmission line for transmitting the WDM optical signal transmitted from the transmitting end, and The receiving end used to receive the transmitted WDM optical signal. In addition, the optical communication system includes one or more optical transponders as required, which have the function of amplifying WDM optical signals in the optical transmission line. [0003] In such optical communication systems, the wavelength of each optical signal degrades due to nonlinear optical effects in optical transmission lines. In order ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/06H01S3/067H01S3/10H01S3/102H01S3/30H04B10/02H04B10/17H04B10/18H04B10/29H04J14/00H04J14/02
CPCH04B10/2916H01S3/06754H01S3/1022H04B10/2972H04B2210/258H01S3/302H01S3/06758H01S3/06766H01S3/0677H01S3/06775H01S3/2391H01S3/1001H04B10/032H04B10/07H04B10/2581H04B10/291
Inventor 瑞纳·海恩伯格寺原隆文
Owner FUJITSU LTD