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Related Concept Videos

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...
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...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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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Related Experiment Video

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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

Flattopped tunable wavelength-division-multiplexer filter design.

M Yang1, C Gu

  • 1Department of Electrical Engineering, 225 Applied Sciences Building, University of California, Santa Cruz, Santa Cruz, California 95064, USA. myang@cse.ucsc.edu

Applied Optics
|February 29, 2008
PubMed
Summary
This summary is machine-generated.

We designed a novel tunable optical filter with a flat-topped passband using a Fabry-Perot etalon and grating mirrors. This filter is ideal for wavelength-division-multiplexing (WDM) optical fiber communications.

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Area of Science:

  • Optics and Photonics
  • Optical Communications

Background:

  • Wavelength-division-multiplexing (WDM) systems require advanced optical filters.
  • Existing tunable filters often lack flat-topped passbands, impacting signal integrity.

Purpose of the Study:

  • To design the first tunable optical filter with a flat-topped passband.
  • To achieve wavelength tunability through refractive index modulation.

Main Methods:

  • Utilized a Fabry-Perot etalon with multiple reflection gratings as dielectric mirrors.
  • Employed modulation of refractive indices within the cavity and mirrors for tunability.

Main Results:

  • Designed a filter with a 1-nm linewidth and a 40-nm wavelength-tuning range.
  • Demonstrated feasibility for WDM optical fiber communication systems.

Conclusions:

  • The proposed filter design offers a flat-topped passband and tunable characteristics.
  • Performance is influenced by factors like absorption and parameter variations.