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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:
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
Cascaded Op Amps01:16

Cascaded Op Amps

Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
Second-order Op Amp Circuits01:19

Second-order Op Amp Circuits

Implementing second-order low-pass filters in audio systems is crucial in refining audio signals by eliminating undesirable high-frequency noise. These filters typically involve second-order op-amp circuits configured as voltage followers, encompassing two nodes with distinct storage elements.
The analysis of such circuits follows a systematic approach, similar to the second-order RLC circuits. In practical scenarios, bulky inductors are rarely employed due to their size and weight. This means...
Open and closed-loop control systems01:17

Open and closed-loop control systems

Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal and...

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Related Experiment Video

Updated: Jun 22, 2026

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

Optically controlled Sagnac loop comb filter.

K Lee, M Fok, S Wan

    Optics Express
    |June 3, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a tunable birefringence comb filter using a semiconductor optical amplifier Sagnac loop. This device allows dynamic wavelength tuning by controlling the amplifier

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    Related Experiment Videos

    Last Updated: Jun 22, 2026

    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

    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
    05:57

    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

    Published on: April 1, 2020

    Area of Science:

    • Optoelectronics
    • Photonics
    • Optical Engineering

    Background:

    • Comb filters are crucial for wavelength-division multiplexing.
    • Dynamic tunability in optical filters is highly desirable for flexible optical networks.
    • Semiconductor optical amplifiers (SOAs) offer unique nonlinear optical properties.

    Purpose of the Study:

    • To propose and demonstrate a novel dynamically tunable birefringence comb filter.
    • To investigate the wavelength tuning mechanism based on optical modulation of SOA birefringence.
    • To analyze the relationship between control light power and wavelength shift.

    Main Methods:

    • Implementation of a Sagnac loop interferometer incorporating a semiconductor optical amplifier (SOA).
    • Optical modulation of the SOA's birefringence to induce wavelength tuning.
    • Characterization of the filter's spectral response and tuning range.
    • Analysis of the tuning relation with respect to control light power.

    Main Results:

    • Demonstrated dynamic tuning of output wavelengths in the comb filter.
    • Observed a monotonic increase in wavelength shift with control light power up to saturation.
    • Tuning range achieved was up to 59% of the comb spacing.
    • Tuning behavior was independent of comb spacing determined by the polarization-maintaining fiber (PMF).

    Conclusions:

    • The proposed SOA-based Sagnac loop interferometer is an effective platform for dynamically tunable birefringence comb filters.
    • Optical modulation of SOA birefringence provides a viable method for controlling filter wavelengths.
    • The device offers significant tuning capabilities with potential applications in reconfigurable optical systems.