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Related Concept Videos

Bandpass Sampling01:17

Bandpass Sampling

In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
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Related Experiment Video

Updated: Jun 21, 2026

Writing Bragg Gratings in Multicore Fibers
08:48

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Multi-channel notch filter based on a phase-shift phase-only-sampled fiber Bragg grating.

Ming Li1, Hongpu Li, Yves Painchaud

  • 1Department of Electrical and Electronic Engineering, Shizuoka University, Hamamatsu, Japan.

Optics Express
|July 8, 2009
PubMed
Summary

We developed a tunable multi-channel notch filter using a fiber Bragg grating (FBG). This novel method achieved a 51-channel filter, demonstrating potential for fiber lasers and optical logic devices.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

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Last Updated: Jun 21, 2026

Writing Bragg Gratings in Multicore Fibers
08:48

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Area of Science:

  • Photonics and Optical Engineering
  • Fiber Optic Devices
  • Signal Processing

Background:

  • Multi-channel notch filters are crucial for wavelength-selective signal processing.
  • Existing methods often lack tunability or sufficient channel count.
  • Fiber Bragg gratings (FBGs) offer a robust platform for optical filtering.

Purpose of the Study:

  • To propose and demonstrate a novel tunable multi-channel notch filter.
  • To leverage thermally induced phase shifts in sampled FBGs for filter implementation.
  • To explore applications in multiwavelength fiber lasers and optical logic devices.

Main Methods:

  • Implementation of a phase-only sampled fiber Bragg grating (FBG).
  • Utilizing a thermally induced phase-shift mechanism for tunability.
  • Numerical simulations and experimental validation of the proposed filter design.

Main Results:

  • A 51-channel notch filter was successfully realized.
  • Achieved a narrow bandwidth (FWHM) of 0.026 nm.
  • Demonstrated a wide tuning range of 0.6 nm for the filter channels.

Conclusions:

  • The proposed method provides an effective approach for tunable multi-channel notch filtering.
  • The demonstrated FBG-based filter shows significant potential for advanced photonic applications.
  • This technique enables enhanced performance in multiwavelength fiber lasers and all-optical logic devices.