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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...
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:
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...
Design Example01:23

Design Example

The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:

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Related Experiment Video

Updated: Jun 16, 2026

Writing Bragg Gratings in Multicore Fibers
08:48

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Tunable multimode-interference bandpass fiber filter.

J E Antonio-Lopez1, A Castillo-Guzman, D A May-Arrioja

  • 1Photonics and Optical Physics Laboratory, Optics Department, Instituto Nacional de Astrofísica,Optica y Electrónica, Tonantzintla, Puebla 72000, Mexico.

Optics Letters
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

We developed a tunable fiber optic filter using multimode interference (MMI) effects. This device enables wavelength tuning for fiber lasers by adjusting the multimode fiber length, demonstrating a 30 nm C-band tunability.

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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

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Last Updated: Jun 16, 2026

Writing Bragg Gratings in Multicore Fibers
08:48

Writing Bragg Gratings in Multicore Fibers

Published on: April 20, 2016

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Area of Science:

  • Photonics and Optical Engineering
  • Fiber Optics Technology

Background:

  • Multimode interference (MMI) effects offer potential for optical filtering.
  • Fiber optic filters are crucial components in tunable laser systems.
  • Controlling MMI filter characteristics is key to achieving wavelength tunability.

Purpose of the Study:

  • To design and demonstrate a wavelength-tunable filter based on MMI.
  • To integrate the tunable MMI filter into an erbium-doped fiber laser.
  • To achieve broad wavelength tunability within the C-band.

Main Methods:

  • Constructed an MMI filter by splicing a multimode fiber (MMF) between two single-mode fibers (SMF).
  • Employed a capillary tube filled with refractive-index-matching liquid to dynamically alter the effective MMF length.
  • Integrated the tunable MMI filter into a ring-based erbium-doped fiber laser cavity.

Main Results:

  • The MMI filter's peak wavelength response showed a linear dependence on MMF length.
  • Wavelength tuning was successfully achieved by modifying the MMF length using the liquid-filled capillary.
  • Demonstrated a tunable erbium-doped fiber laser with a tunability of 30 nm, covering the full C-band.

Conclusions:

  • A novel wavelength-tunable filter based on MMI effects was successfully demonstrated.
  • The proposed MMI filter design provides an effective method for achieving wavelength tuning in fiber lasers.
  • The demonstrated tunable fiber laser system shows promise for applications requiring C-band wavelength agility.