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Related Concept Videos

Active Filters01:25

Active Filters

773
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:
773
Second-order Op Amp Circuits01:19

Second-order Op Amp Circuits

300
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...
300
Passive Filters01:27

Passive Filters

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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...
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Second-Order Circuits01:17

Second-Order Circuits

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Integrating two fundamental energy storage elements in electrical circuits results in second-order circuits, encompassing RLC circuits and circuits with dual capacitors or inductors (RC and RL circuits). Second-order circuits are identified by second-order differential equations that link input and output signals.
Input signals typically originate from voltage or current sources, with the output often representing voltage across the capacitor and/or current through the inductor. For example, in...
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Reconstruction of Signal using Interpolation01:10

Reconstruction of Signal using Interpolation

172
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
172
Op Amp AC Circuits01:18

Op Amp AC Circuits

184
Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1).
184

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Related Experiment Video

Updated: Jun 5, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Reconfigurable second-order optical all-pass filter.

Yu Chen1, Lu Xu1, WeiJun Jiang1

  • 1Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

We developed a novel second-order optical all-pass filter (APF) using microring resonators. This device enables adjustable time delays and phase shifts, overcoming limitations of existing first-order APFs for optical signal manipulation.

Keywords:
all-pass filtermicrowave photonic phase shiftersilicon photonicsvariable time delay

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Area of Science:

  • Photonics
  • Optical Engineering
  • Integrated Optics

Background:

  • Optical all-pass filters (APFs) are crucial for phase manipulation without amplitude distortion.
  • High-order APFs offer larger time delays and phase shifts but have been limited to cascaded first-order designs, increasing complexity.
  • Existing first-order APFs are typically based on lossy waveguides.

Purpose of the Study:

  • To propose and demonstrate a novel second-order optical all-pass filter (APF).
  • To overcome the limitations of complexity and size associated with cascaded first-order APFs.
  • To achieve significant adjustable time delays and phase shifts for optical signal processing.

Main Methods:

  • Fabrication of a second-order APF using a silicon-on-insulator platform.
  • Integration of Mach-Zehnder interferometer-assisted microring resonators.
  • Demonstration of reconfigurability between second-order and first-order APF functionalities.

Main Results:

  • Achieved an adjustable time delay from 553 to 948 ps with <1.7 dB amplitude variation using the second-order APF.
  • Demonstrated a microwave photonic phase shifter with adjustable phase shift from 0 to 3.27π and <2.4 dB RF power variation.
  • Reconfigured the device to a first-order APF, providing adjustable time delay from 257 to 429 ps with <0.9 dB amplitude variation.

Conclusions:

  • The proposed second-order APF offers a flexible and compact solution for high-order optical filtering.
  • This technology provides a novel approach for manipulating optical signals with enhanced performance.
  • The reconfigurable nature of the device enhances its utility in various photonic applications.