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Method for reducing system deteriotation due to polarization effect and equipment

A polarization effect and polarization axis technology, applied in the field of optical communication, can solve problems such as deterioration and difficulty in effectively solving optical signals

Inactive Publication Date: 2004-10-13
KOREA ADVANCED INST OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned PCT international application WO01 / 65733 design is only used to reduce the impact of PMD, so it is difficult to effectively solve the deterioration problem of the optical signal caused by the polarization effect

Method used

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  • Method for reducing system deteriotation due to polarization effect and equipment
  • Method for reducing system deteriotation due to polarization effect and equipment
  • Method for reducing system deteriotation due to polarization effect and equipment

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Embodiment Construction

[0025] Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or similar components are denoted by the same reference numerals even if they are depicted in different drawings. In the following specification, descriptions of known functions and constructions incorporated will be omitted when the description may make the subject matter of the present invention unclear.

[0026] figure 1 A schematic diagram illustrating a method for reducing system degradation caused by all polarization effects (eg, PMD, PDG, and PDL, etc.) according to a preferred embodiment of the present invention. according to figure 1 method, the transmission end divides the polarization part of the NRZ (non-return-to-zero) signal into two parts that are orthogonal to each other within one bit, thereby generating a predetermined polarization state, where Ax is orthogonal to Ay and Bx is also orthogonal By. and...

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Abstract

A method and apparatus for minimizing system deterioration caused by polarization effects (e.g., a polarization-dependent gain (PDG), a polarization-dependent loss (PDL), and a polarization mode dispersion (PMD)). The apparatus performs a signal modulation process to enable one bit to simultaneously contain two orthogonal polarization components, resulting in a minimum DOP (Degree Of Polarization). If a signal undergoes the PMD, the apparatus converts an NRZ (Non Return to Zero) signal into an RZ (Return to Zero) signal, resulting in minimum inter-symbol interference caused by the PMD. The apparatus can improve a performance of an optical signal during the PMD operation, whereas a conventional PMD compensation technique has been designed to remove system deterioration caused by only the PMD.

Description

technical field [0001] The present invention relates to an optical communication method and apparatus, and more particularly to a method and apparatus for reducing system degradation due to polarization effects experienced in an optical communication system. Background technique [0002] With the current trend of rapidly increasing the transmission rate and transmission distance of optical communication systems, various phenomena suffering from polarization effects have recently been recognized as major factors leading to deterioration of system performance. For example, in long-distance optical communication networks using EDFAs (Erbium-Doped Fiber Amplifiers), system performance is degraded due to PDG (Polarization-Dependent Gain) and PDL (Polarization-Dependent Loss) degrading the optical signal-to-noise ratio (SNR) . The above problems can be significantly improved by reducing the DOP (degree of polarization) of the transmitted optical signal. Therefore, a method of con...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2507H04B10/07H04B10/2569H04B10/516H04B10/524H04B10/532H04B10/54H04B10/556H04B10/61
CPCH04B10/2572H04B10/2507H04B10/2569
Inventor 郑允喆李俊行尹千主
Owner KOREA ADVANCED INST OF SCI & TECH