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Forward error correction for high-speed optical transmission system

A technology of forward error correction and optical transmission, which is applied in the direction of transmission system, digital transmission system, electromagnetic wave transmission system, etc., to achieve the effect of reducing delay and reducing overhead

Inactive Publication Date: 2004-05-26
LUCENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scaling to higher rates, such as STM-64 signals that are equivalent in rate to SONET STS-192 signals, can also cause problems due to buffer storage requirements (such as the entire 1 frame) and latency (such as about 125μs)

Method used

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  • Forward error correction for high-speed optical transmission system
  • Forward error correction for high-speed optical transmission system
  • Forward error correction for high-speed optical transmission system

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Embodiment Construction

[0021] Although the embodiments described in this specification are particularly suitable for SONET / SDH STS-192 / STM-64 (10Gb / s) signal structures, and will be described in this illustration, skilled artisans will understand from the teachings in this specification The principles of the invention also apply to other signaling rates and other signal structures. Accordingly, the embodiments shown and described herein are illustrative only and not restrictive. It should be noted, however, that while the principles of the present invention can be applied to low transmission rate SONET / SDH signals, it is generally known that lower transmission rate signals are not as susceptible to optical impairments as higher transmission rate signals.

[0022] In general, applying forward error correction involves two main considerations. First, an appropriate FEC algorithm must be selected that provides appropriate data redundancy for error correction in order to improve the overall BER perform...

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Abstract

Memory requirements and processing delays associated with the application of forward error correction in high speed optical transmissions are substantially reduced by mapping a forward error correction code on a row-by-row basis into unused overhead bytes in a high bit rate signal frame. By applying the forward error correction code to an entire row of the signal frame on a row by row basis, approximately one row needs to be stored at a time thereby reducing the total memory requirements for forward error correction processing. Using SONET as an exemplary application, approximately {fraction (1 / 9th of the entire SONET frame (e.g., one of nine rows) needs to be buffered for forward error correction processing.

Description

technical field [0001] This invention relates generally to optical transmission systems, and more particularly to forward error correction for high speed optical transmission systems. Background technique [0002] Optical transmission systems operating at high transmission rates, such as Synchronous Optical Network / Synchronous Digital Hierarchy (SONET / SDH) systems operating at 10 Gb / s, are known to suffer from signal-to-noise ratio errors and impairments associated with optical amplifiers. Among other problems, these impairments can create unpredictable bit error rates on high-speed optical links that carry both voice and data traffic. For example, when multiple optical fiber amplifiers are connected in series in a long-distance optical communication system, the result of the noise accumulation generated by the optical fiber amplifiers will cause a floor for the bit error rate performance of the link (that is, the minimum bit error rate that can be achieved). [0003] Forwa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/03H04B10/00H04B10/556H04J3/00H04J3/14H04J3/16H04L1/00H04Q11/04
CPCH04L1/0057H04J3/14H04J2203/0089H04L1/0043H04L1/0083H04J3/1611
Inventor 马克·阿尔多·波尔多纳拉尔夫·道尔门沃尔夫兰·斯藤
Owner LUCENT TECH INC