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Mode recoupling in a novel Bragg grating pair.

A Ping Zhang1, Hwa-Yaw Tam, Xiao-Ming Tao

  • 1Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China.

Optics Letters
|April 17, 2003
PubMed
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A novel Bragg grating pair overcomes previous limitations, offering higher reflectivity than earlier designs. This new fiber optic sensor is more practical due to reduced signal loss.

Area of Science:

  • Optics
  • Fiber Optics
  • Photonics

Background:

  • Concatenated long-period and fiber Bragg gratings have limitations.
  • Previous designs were restricted in reflectivity (below 50%).
  • Signal loss from long-period gratings impacts practical applications.

Purpose of the Study:

  • To propose a new mode recoupling method in a Bragg grating pair.
  • To overcome limitations of existing concatenated grating structures.
  • To achieve higher reflectivity and reduce signal loss.

Main Methods:

  • Writing one grating in the fiber cladding of a Bragg grating pair.
  • Utilizing mode recoupling for spectral properties.
  • Analyzing reflection spectrum and reflectivity.

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Main Results:

  • The new Bragg grating pair exhibits a similar reflection spectrum to previous designs.
  • Achieved reflectivity significantly exceeds the 50% limitation of earlier methods.
  • Eliminated signal loss associated with long-period gratings.

Conclusions:

  • The proposed Bragg grating pair offers superior performance.
  • Higher reflectivity and reduced loss make it attractive for practical applications.
  • This advancement overcomes key limitations in fiber optic grating technology.