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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.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
Active Filters01:25

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:

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Updated: Jun 19, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Gain stabilization in a narrow-band optical filter.

H Sabert, R Ulrich

    Optics Letters
    |October 2, 2009
    PubMed
    Summary

    This study introduces an active fiber-optic Fabry-Perot filter with adjustable bandwidth (1-100 kHz) for 1088 nm radiation. Its stability is achieved by linking gain to a nearby laser, enabling electronic tunability.

    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Laser Technology

    Background:

    • Fabry-Perot filters are crucial optical components.
    • Controlling bandwidth and transmission stability is a key challenge.
    • Active gain elements are explored for filter enhancement.

    Purpose of the Study:

    • To develop an active fiber-optic Fabry-Perot filter.
    • To achieve adjustable optical bandwidth in the 1-100 kHz range.
    • To stabilize filter performance using gain clamping.

    Main Methods:

    • Utilized a Nd(3+)-doped fiber for gain provision.
    • Implemented a gain clamping technique linking filter gain to a nearby laser oscillation.
    • Designed for electronic continuous tunability.

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    Main Results:

    • Demonstrated an active fiber-optic Fabry-Perot filter.
    • Achieved an adjustable optical bandwidth from 1 kHz to 100 kHz.
    • Bandwidth and peak transmission were stabilized effectively.

    Conclusions:

    • The developed filter offers tunable and stable optical filtering.
    • Gain clamping provides a robust method for stabilizing active optical filters.
    • This technology has potential applications in spectroscopy and optical communications.