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Channel allocation method, channel decorrelation method and DWDM (dense wavelength division multiplexing) transmission experimental system

An experimental system and de-correlation technology, applied in transmission monitoring/testing/fault measurement systems, wavelength division multiplexing systems, etc., can solve problems such as inability to correctly estimate the influence of cross-phase modulation

Active Publication Date: 2014-08-13
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional parity decorrelation methods cannot correctly estimate the impact of cross-phase modulation in practical optical communication systems

Method used

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  • Channel allocation method, channel decorrelation method and DWDM (dense wavelength division multiplexing) transmission experimental system
  • Channel allocation method, channel decorrelation method and DWDM (dense wavelength division multiplexing) transmission experimental system
  • Channel allocation method, channel decorrelation method and DWDM (dense wavelength division multiplexing) transmission experimental system

Examples

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no. 1 example

[0026] figure 1 A schematic structural diagram of a dense wavelength division multiplexing transmission experimental system 10 according to an embodiment of the present invention is shown. In this experimental system, it is necessary to distribute the wavelength channels of the transmitter to multiple delay lines to realize these wavelengths Channel decorrelation. The basic principle of the experimental system is that after the information sequences on different wavelength channels sent by the transmitter pass through different delay lines with sufficient length, these information sequences can be considered to be independent of each other.

[0027] as from figure 1 As can be seen in , the experimental system 10 includes N transmitters 110, N×M couplers 120 and M delay lines 130, where N and M are natural numbers. Each transmitter includes multiple wavelength channels. For example, the wavelengths of the wavelength channels included in transmitter #1 are λ 1 , lambda N+1 ...

no. 2 example

[0037] According to an embodiment of the present invention, a method for determining the delay line length in the DWDM transmission experimental system 10 is proposed. image 3 A flow chart of a method for determining the length of a delay line according to an embodiment of the present invention is shown.

[0038] as from image 3 As can be seen in the , the method includes:

[0039] Step S310: Obtain the minimum delay time τ min . The minimum delay time τ min It can be given in advance, or can be calculated according to the following formula:

[0040] τ min = i × 1 f 0 = i × 2 πDNΔλ α - - - ( 1 )

[0041] where D is the fiber dispersion coefficient, N is the number of...

no. 3 example

[0052] According to an embodiment of the present invention, a method for decorrelating channels in a dense wavelength division multiplexing transmission experimental system is proposed. Figure 4 A flowchart of a method for decorrelating channels according to an embodiment of the present invention is shown.

[0053] Such as Figure 4 As shown, the method includes the following steps:

[0054] S410: Provide dense wavelength division multiplexing transmission experimental system. as in the previous combination figure 1 As described, the experimental system 10 includes N transmitters 110, N×M couplers 120 and M delay lines 130, where N and M are natural numbers. Each transmitter includes multiple wavelength channels. For example, the wavelengths of the wavelength channels included in transmitter #1 are λ 1 , lambda N+1 ,...,λ kN+1 , the wavelengths of the wavelength channels included in transmitter #2 are λ 2 , lambda N+2 ,...,λ kN+2 etc., where the wavelength differenc...

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PUM

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Abstract

The invention discloses a channel allocation method, a channel decorrelation method and a DWDM (dense wavelength division multiplexing) transmission experimental system which are used for allocating wavelength channels of transmitters to delay lines in the DWDM transmission experimental system. The channel allocation method comprises a first allocation step and a second allocation step, wherein the first allocation step comprises: respectively selecting M wavelength channels which are nearest to wavelength channels to be measured from the wavelength channels contained in each transmitter, and allocating the selected M wavelength channels of each transmitter to the M delay lines in a one-to-one correspondence mode; and the second allocation step comprises: averagely allocating the rest of wavelength channels to the M delay lines as far as possible, and ensuring that the any two wavelength channels of which the wavelength difference is N delta lambda from the same transmitter are not allocated to the same delay line.

Description

technical field [0001] The invention relates to the communication field, in particular to a channel de-correlation method and device in a dense wavelength division multiplexing transmission experimental system, and a dense wavelength division multiplexing transmission experimental system. Background technique [0002] In Dense Wavelength Division Multiplexing (DWDM) systems, phase noise caused by Cross-Phase Modulation (Cross-PhaseModulation, XPM) is one of the main reasons affecting system performance. In order to estimate the impact of cross-phase modulation, a common method is to conduct multi-channel transmission experiments in the laboratory. The traditional experimental method is the odd-even decorrelation method, which has been widely used in various multi-channel transmission experiments. In this method, all odd-numbered channels pass through the same optical transmitter, all even-numbered channels pass through another optical transmitter, and finally all channels a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04B10/07
Inventor 严伟振陶振宁
Owner FUJITSU LTD
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