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Differential interference measuring device and measuring method for optical fiber grating group delay spectrum

A fiber grating and interferometric measurement technology, applied in the field of fiber grating, can solve the problems of discontinuity of measurement data, affecting the calculation and processing of phase data, etc.

Inactive Publication Date: 2007-08-08
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the discontinuity of the measurement data will be introduced, which will affect the calculation and processing of the phase data

Method used

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  • Differential interference measuring device and measuring method for optical fiber grating group delay spectrum
  • Differential interference measuring device and measuring method for optical fiber grating group delay spectrum
  • Differential interference measuring device and measuring method for optical fiber grating group delay spectrum

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Embodiment Construction

[0062] The schematic diagram of the optical path of Embodiment 1 of the differential interferometry device for fiber grating group delay spectrum of the present invention is shown in FIG. 1 . As can be seen from the figure, the differential interferometry device of the group delay spectrum of the fiber grating of the present invention comprises a four-terminal fiber coupler 4, and its first port 41 is connected to the output end of a tunable laser 6 through an optical isolator 5 , the second port 42 is connected to the fiber grating 1 to be tested, the third port 43 is connected to the reflective variable delayer 2 through the fiber phase modulator 3 , and the fourth port 44 is connected to the optical signal receiver 7 .

[0063] Fig. 3 is a schematic diagram of the optical path of Embodiment 2 of the differential interferometry device for the fiber grating group delay spectrum of the present invention.

[0064] The optical fiber phase modulator 3 is an optical fiber 31 wound...

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Abstract

The invention is a differential interference measuring device and method for fiber grating group delay spectrum. The character lies in: it includes a four-terminal fiber coupler, the first port is connected with an output end of an adjustable laser through a light isolation device, the second port is connected to the fiber gratings needed to be measured, the third port is connected to the reflection type variable delay device through a fiber phase adjusting device, the fourth port is connected to the light signal receiver. The method is simple and convenient, the cost is low.

Description

Technical field: [0001] The present invention relates to fiber gratings, in particular to a differential interferometry device and measurement method for group delay spectrum and group delay dispersion of fiber gratings, which are mainly used in the testing of fiber grating dispersion compensation devices in optical fiber communication and other related spectral measurements and tuning applications. Background technique [0002] The main factors affecting the transmission distance in optical fiber communication technology are the attenuation of the optical signal and the broadening of the optical signal pulse. Fiber dispersion is one of the main causes of optical pulse broadening. The dispersion of the optical fiber can be compensated by using the group delay characteristic of the reflection spectrum of the chirped fiber grating. It has become a major dispersion compensation device. The design and fabrication of dispersion-compensated chirped fiber grating must measure an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J9/02G01J3/00
Inventor 方祖捷瞿荣辉蔡海文李琳
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI