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Related Concept Videos

Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
Downsampling01:20

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
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: May 18, 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

Simultaneous broadband microwave downconversion and programmable complex filtering by optical frequency comb shaping.

Victor Torres-Company1, Daniel E Leaird, Andrew M Weiner

  • 1School of Electrical and Computer Engineering, Purdue University, 465 Northwestern Avenue, West Lafayette, Indiana 47907, USA. torres31@purdue.edu

Optics Letters
|October 3, 2012
PubMed
Summary
This summary is machine-generated.

High-repetition-rate optical frequency combs function as photonic mixers, downconverting microwave signals to intermediate frequencies (IF). This technology enables programmable multitap filtering within the IF band for advanced microwave signal processing.

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Area of Science:

  • Optoelectronics
  • Photonics
  • Microwave Signal Processing

Background:

  • High-repetition-rate optical frequency combs serve as versatile photonic mixers.
  • These combs can downconvert microwave signals to intermediate frequency (IF) bands, making them accessible to high-speed electronics.

Purpose of the Study:

  • To demonstrate simultaneous programmable multitap complex-coefficient-filtering within the IF band using optical frequency combs.
  • To explore new possibilities for microwave signal processing by integrating optoelectronic frequency comb technology with high-speed analog-to-digital converters.

Main Methods:

  • Utilizing line-by-line pulse shaping for precise control over the optical frequency comb.
  • Employing dispersive propagation to manipulate the optical signal.
  • Leveraging the photonic mixer to perform complex-coefficient-filtering within the intermediate frequency band.

Main Results:

  • The photonic mixer successfully performed simultaneous programmable multitap complex-coefficient-filtering within the IF band.
  • The proposed solution effectively combines the flexibility of optical frequency comb technology with the capabilities of high-speed analog-to-digital converters.

Conclusions:

  • This research presents a novel approach for advanced microwave signal processing.
  • The integration of optical frequency comb technology offers significant advancements in signal processing flexibility and performance.