System and method for accurately measuring three-order dispersion of optical fiber

A third-order dispersion and precise measurement technology, applied in the field of measurement, can solve problems such as difficult to accurately determine the high-order dispersion of optical fibers

Active Publication Date: 2018-04-13
TSINGHUA UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

The common disadvantage of both solutions is that it is difficult to accurately determine the high-order dispersion in the fiber because the high-order dispersion terms are related to the difference in wavelength delay

Method used

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  • System and method for accurately measuring three-order dispersion of optical fiber
  • System and method for accurately measuring three-order dispersion of optical fiber
  • System and method for accurately measuring three-order dispersion of optical fiber

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Embodiment Construction

[0061] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0062] The system and method for accurately measuring the third-order dispersion of optical fiber according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0063] The working principle of the present invention for accurately measuring the third-order dispersion of optical fiber is introduced here.

[0064] The optical fiber to be tested is used as a dispersive medium, and the phase delay of the main mode of the light field is:

[0065]

[0066] Among them, Ω i...

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Abstract

The invention discloses a system and method for accurately measuring three-order dispersion of an optical fiber. The system comprises a wide spectrum light source, a light splitting device, an electro-optic modulator, a programmable optical processor, a light merging device, a photoelectric detector, a vector network analyzer and a processor. A passband broadening factor B is calculated by the processor according to system response data of the vector network analyzer, whether the passband broadening factor B exceeds a preset threshold is judged, and if so, the processor iteratively calculatesa dispersion compensation coefficient and continuously controls the programmable optical processor to produce a new compensation baseband signal until the passband broadening factor B does not exceedthe preset threshold. When the calculated passband broadening factor B does not exceed the preset threshold, it indicates that the three-order dispersion value in the optical fiber is accurately compensated, and the three-order dispersion value in the to-be-measured optical fiber is accurately determined according to the final passband broadening factor B in accordance with the relationship between the compensation amount and the residual amount.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a system and method for accurately measuring the third-order dispersion of optical fibers. Background technique [0002] Third-order dispersion is one of the basic characteristics of optical fiber. Usually when the optical pulse propagates away from the zero-dispersion wavelength of the fiber, the influence of the third-order dispersion is small and can be regarded as a perturbation. However, with the increasing demands on the speed of optical communication over the past decade, ultrashort pulse transmission technology has become crucial. For ultra-short pulse technology, since the pulse spectrum width is large enough, the signal distortion introduced by the third-order dispersion becomes significant at this time, and it cannot be treated as perturbation. In the ultra-fast optical time division multiplexing system with transmission speed up to 1Tb / s (optical pulse width is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/079
CPCH04B10/07951
Inventor 郑小平高玉荣李尚远薛晓晓
Owner TSINGHUA UNIV
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