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Bandpass Sampling

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.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...

Active Filters

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:

Passive Filters

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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Related Experiment Video

Updated: Jun 22, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

Adjustable bandwidth dispersionless bandpass FBG optical filter.

Ian Littler, Martin Rochette, Benjamin Eggleton

|June 5, 2009

Summary

This study presents a novel fiber Bragg grating optical filter with continuously adjustable bandwidth and tunable wavelength. This dispersionless filter enables reconfigurable data rates and wavelength conversion in optical communication systems.

Area of Science:

Photonics and Optical Engineering
Telecommunications Technology
Materials Science for Optical Devices

Background:

Traditional optical filters often lack flexibility in bandwidth adjustment and wavelength tuning.
Maintaining a low group delay slope is crucial for minimizing phase distortion in optical signals.
Existing solutions for reconfigurable optical filters can be complex and may introduce significant signal degradation.

Purpose of the Study:

To introduce a novel bandpass optical filter based on fiber Bragg gratings.
To demonstrate continuous bandwidth adjustment while maintaining near-zero group delay slope.
To showcase the filter's application in a 2R-regenerator for reconfigurable optical networks.

Main Methods:

Design and fabrication of a bandpass optical filter utilizing fiber Bragg gratings.

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Writing Bragg Gratings in Multicore Fibers

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Last Updated: Jun 22, 2026

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Wideband Optical Detector of Ultrasound for Medical Imaging Applications

Published on: May 11, 2014

Writing Bragg Gratings in Multicore Fibers

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Characterization of the filter's spectral properties, including bandwidth tunability and group delay response.

Integration of the filter into a 2R-regenerator system to evaluate its performance in data rate reconfiguration and wavelength conversion.

Main Results:

The developed fiber Bragg grating filter allows for continuous adjustment of the Gaussian spectrum bandwidth.
Near-zero group delay slope is maintained across the filter's operational bandwidth.
The filter is wavelength tunable and its spectral profile is selectable through grating design.
Successful employment in a 2R-regenerator demonstrated data rate reconfiguration and wavelength conversion with negligible phase distortion.

Conclusions:

The novel fiber Bragg grating optical filter offers unprecedented flexibility in bandwidth control and wavelength tunability.
The filter's dispersionless nature and reconfigurability make it highly suitable for advanced optical communication systems.
This technology addresses the need for efficient and high-performance optical filters in next-generation networks.