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Related Concept Videos

Passive Filters01:27

Passive Filters

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...

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Writing Bragg Gratings in Multicore Fibers
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Compact optical short-pass filters based on microfibers.

Yuan Chen1, Zhe Ma, Qing Yang

  • 1Department of Optical Engineering, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, China.

Optics Letters
|November 4, 2008
PubMed
Summary

Researchers developed a compact microfiber short-pass filter. This filter offers tunable wavelength ranges and high performance, suitable for various spectral applications.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Short-pass filters are crucial optical components for wavelength selection.
  • Existing filters often face limitations in size, tunability, or performance.

Purpose of the Study:

  • To demonstrate a novel, compact short-pass filter using microfiber technology.
  • To investigate the tunability and performance characteristics of this new filter design.

Main Methods:

  • Fabrication of a short-pass filter by integrating a microfiber with a low-index substrate.
  • Systematic variation of the microfiber-substrate interaction length to tune the cutoff wavelength.
  • Characterization of filter performance, including rejection loss and insertion loss.

Main Results:

  • Achieved tunable cutoff wavelength over a 400 nm range by adjusting interaction length.
  • Demonstrated high rejection loss (>40 dB) and low insertion loss (<0.3 dB).
  • Showcased filter applicability across a wide spectral range (600-1500 nm) with fiber diameter tuning.

Conclusions:

  • The microfiber-based short-pass filter offers a compact, simple, and high-performance solution.
  • Its wideband applicability and compatibility with miniaturized devices make it promising for advanced photonic applications.