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Related Experiment Videos

Optically tunable fiber grating transmission filters.

Yicheng Lai1, W Zhang, L Zhang

  • 1Photonics Research Group, School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK. laiy@aston.ac.uk

Optics Letters
|December 24, 2003
PubMed
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We developed tunable fiber grating filters using optical pump-induced thermal effects in Er/Yb-codoped fibers. This method offers a repeatable, wavelength-independent phase shift for precise optical signal control.

Area of Science:

  • Optical Engineering
  • Materials Science
  • Photonics

Background:

  • Fiber Bragg gratings (FBGs) are crucial for optical filtering.
  • Remote tunability of optical filters remains a challenge.
  • Thermal effects in doped fibers can be exploited for optical control.

Purpose of the Study:

  • To propose and demonstrate remotely tunable single- and multiple-passband fiber grating transmission filters.
  • To investigate the use of optical pump-induced thermal effects for filter tuning.
  • To characterize the performance of these tunable filters.

Main Methods:

  • Utilizing Er/Yb-codoped fiber sections to induce thermal effects via optical pumping.
  • Fabricating fiber grating transmission filters.

Related Experiment Videos

  • Measuring induced phase shift, extinction ratio, and pump power dependence.
  • Assessing repeatability, hysteresis, and anisotropic effects.

    • Main Results:

    • Achieved a repeatable, wavelength-independent induced phase shift of 0.1 pi/mW.
    • Demonstrated filter tuning without hysteresis or anisotropic effects.
    • Obtained a transmission extinction ratio exceeding 23 dB with a 3-mW pump power change.

    Conclusions:

    • The proposed method enables effective remote tunability of fiber grating filters.
    • Er/Yb-codoped fibers provide a reliable platform for pump-induced thermal tuning.
    • The demonstrated filters offer high performance for optical signal processing applications.