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Frame generation method, optical transmission device and optical transmission system

An optical transmission and area technology, applied in transmission systems, digital transmission systems, time-division multiplexing systems, etc., can solve the problems of inability to improve transmission quality and deterioration of transmission characteristics, and avoid the increase of transmission speed and high-quality optical fiber. teleportation effect

Active Publication Date: 2014-03-19
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the redundancy exceeds 20% due to the trade-off with the transmission cost, there is a problem that not only the transmission quality cannot be improved, but the transmission characteristics will be degraded.

Method used

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  • Frame generation method, optical transmission device and optical transmission system
  • Frame generation method, optical transmission device and optical transmission system
  • Frame generation method, optical transmission device and optical transmission system

Examples

Experimental program
Comparison scheme
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Embodiment approach 1

[0030] figure 1 It is a diagram showing a configuration example of Embodiment 1 of a digital optical transmission system (hereinafter referred to as an optical transmission system) of the present invention. Such as figure 1 As shown, the optical transmission system of this embodiment includes optical transmission devices 1 - 1 , 1 - 2 , and a communication path 2 .

[0031] The optical transmission devices 1-1 and 1-2 perform mutual conversion of client transmission and reception signals (electrical signals representing information data) and optical transmission and reception signals, such as mapping of client signals and optical transmission frames, demapping processing, error correction coding, and Decoding processing, electrical / optical conversion, etc. The optical transmission devices 1 - 1 and 1 - 2 perform bidirectional communication via the communication path 2 .

[0032] figure 2 It is a configuration diagram showing an example of the functional configuration of t...

Embodiment approach 2

[0051] Figure 9 It is a diagram showing an example of a variable FEC parity area allocation method according to Embodiment 2 of the present invention. The configuration of the optical transmission system and the configurations of the optical transmission devices 1 - 1 and 1 - 2 of the present embodiment are the same as those of the first embodiment. Hereinafter, differences from Embodiment 1 will be described.

[0052] In Embodiment 1, an example was shown in which a variable FEC parity area is set in units of branch slots for storing user data, but the GMP-based (Generic Mapping Procedure, general mapping procedures) fixed padding area is used as a variable FEC parity (VFP) area. Here, GMP is obtained by interpolating the frequency difference between the payload area and user data by discretely inserting fixed padding. exist Figure 9 In , an example is shown in which an area where fixed padding is inserted by GMP is set as a variable FEC parity.

[0053] Figure 10 It...

Embodiment approach 3

[0058] Figure 11 It is a diagram showing an example of a variable FEC parity area allocation method according to Embodiment 3 of the present invention. The configuration of the optical transmission system and the configurations of the optical transmission devices 1 - 1 and 1 - 2 of the present embodiment are the same as those of the first embodiment. Hereinafter, differences from Embodiment 1 will be described.

[0059] In Embodiment 1 and Embodiment 2, examples were shown in which tributary slots in the payload area were used for variable FEC parity and fixed padding based on GMP accommodation. Figure 11 As shown, the ratio of the payload area to the FEC parity redundant area may be changed by y columns. That is, the FEC parity redundant area can be increased by y columns, and the payload area can be decreased by y columns. That is, the increased amount of y columns becomes a variable FEC parity area. Operations of this embodiment other than those described above are th...

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Abstract

The invention is a frame generation method in an optical transmission system that transmits a transmission frame configured of: a payload area that stores information data; and an FEC redundant area that stores an error correction code for the information data. An encoding gain is computed (S2) on the basis of the quality of a communication path on which the transmission frame is to be transmitted. If on the basis of the encoding gain, it is assessed that the error correction code stored in the FEC redundant area will result in insufficient redundancy, a variable parity area that stores the error correction code in the payload area is set (S4), and a transmission frame is generated that stores the error correction code in the FEC redundant area and the variable parity area.

Description

technical field [0001] The present invention relates to a frame generating method, an optical transmission device and an optical transmission system. Background technique [0002] When performing FEC as an error correction technique, an FEC frame in which an error correction code is stored is used for data transmission. As a conventional FEC frame configuration method in an optical communication system, a method in which a redundant area of ​​an OTUk (Optical channel Transport Unit-k, Optical Channel Transport Unit-K) frame is enlarged is applied (for example, refer to Patent Document 1). [0003] In addition, on the premise of expanding the redundant area of ​​the above-mentioned OTUk frame, considering the trade-off between the increase of the transmission penalty due to the increase of the transmission speed and the coding gain due to the expansion of the redundant area, it is proposed that the redundancy of 20% is appropriate suggestion (for example, refer to Non-Patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04J3/1652H04L1/0009H04L1/0083H04L1/0011H03M13/253H04L1/0057
Inventor 久保和夫
Owner MITSUBISHI ELECTRIC CORP