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Related Concept Videos

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:
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...
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...
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...

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Related Experiment Video

Updated: Jun 22, 2026

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

All-optical bandpass microwave filter based on an electro-optic phase modulator.

Fei Zeng, Jianping Yao

    Optics Express
    |June 2, 2009
    PubMed
    Summary

    Researchers developed a novel all-optical microwave filter. This new design mimics a bandpass filter, offering precise frequency control for advanced microwave applications.

    Area of Science:

    • Photonics and Optics
    • Microwave Engineering
    • Signal Processing

    Background:

    • Traditional microwave filters often face limitations in performance and integration.
    • Existing all-optical filter designs may suffer from baseband resonance issues.
    • The need for high-performance, compact microwave filtering solutions is growing.

    Purpose of the Study:

    • To present a novel all-optical microwave filter.
    • To achieve a frequency response equivalent to a bandpass filter using optical components.
    • To overcome the baseband resonance inherent in some optical filter designs.

    Main Methods:

    • Utilized an electro-optic phase modulator.
    • Integrated a dispersive device with the modulator.
    • Configured a two-tap transversal filter architecture.

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    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    Related Experiment Videos

    Last Updated: Jun 22, 2026

    Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
    12:18

    Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

    Published on: August 5, 2013

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

  • Employed optical methods to eliminate baseband resonance.

    • Main Results:

    • Demonstrated an all-optical filter with a bandpass frequency response.
    • Achieved elimination of baseband resonance.
    • Fabricated a two-tap bandpass transversal microwave filter.
    • Measured a null-to-null bandwidth of 8.8 GHz.
    • Attained a notch rejection level of 35 dB.

    Conclusions:

    • The proposed all-optical approach effectively creates a bandpass microwave filter.
    • The combination of electro-optic modulation and dispersion successfully addresses baseband resonance.
    • The demonstrated filter exhibits significant bandwidth and rejection, suitable for advanced microwave systems.