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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...
Voltage Doubler Circuit01:23

Voltage Doubler Circuit

A voltage doubler circuit integrates two main components: a clamping section and a rectifier section. The clamping section consists of a capacitor (C1) and a diode (D1), whereas the rectifier section is equipped with another diode (D2) and capacitor (C2). This circuit produces an output voltage with twice the amplitude of the sinusoidal input voltage.

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Related Experiment Video

Updated: Jun 26, 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

WDM up-conversion employing frequency quadrupling in optical modulator.

Po-Tsung Shih1, Chun-Ting Lin, Wen-Jr Jiang

  • 1Department of Photonics, National Chiao-Tung University, Hsinchu, Taiwan, ROC. boris.eo95g@nctu.edu.tw

Optics Express
|February 4, 2009
PubMed
Summary
This summary is machine-generated.

This study demonstrates an optical up-conversion system for wavelength-division-multiplexing (WDM) communication. It achieves simultaneous transmission of fiber-to-the-x (FTTx) and radio-over-fiber (RoF) signals with minimal signal degradation.

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Last Updated: Jun 26, 2026

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Area of Science:

  • Optical Communications
  • Signal Processing
  • Telecommunications Engineering

Background:

  • Wavelength-division-multiplexing (WDM) systems are crucial for high-capacity optical networks.
  • Existing systems often require complex optical filtering for signal isolation.
  • Mach-Zehnder modulators are key components but susceptible to bias drift.

Purpose of the Study:

  • To develop an optical up-conversion system for WDM communication without optical filtering.
  • To simultaneously transmit wired fiber-to-the-x (FTTx) and wireless radio-over-fiber (RoF) signals.
  • To investigate the impact of modulator bias drift on receiver sensitivity.

Main Methods:

  • Utilized a dual-parallel Mach-Zehnder modulator for optical up-conversion with frequency quadrupling.
  • Generated and transmitted four-channel 1.25-Gb/s FTTx and RoF signals.
  • Analyzed receiver power penalties under varying Mach-Zehnder modulator bias conditions.

Main Results:

  • Achieved simultaneous generation and transmission of FTTx and RoF signals.
  • Demonstrated low receiver power penalties (<1 dB) for up-converted WDM and baseband FTTx signals with bias deviation <20% of half-wave voltage.
  • Confirmed minimal signal degradation (<1 dB penalty) after 50-km standard single-mode fiber (SSMF) transmission for both baseband and 20-GHz RF OOK signals.
  • Showcased the feasibility of 60-GHz optical up-conversion using 15-GHz RF components.

Conclusions:

  • The proposed optical up-conversion system effectively integrates FTTx and RoF services in WDM networks.
  • The system exhibits robustness against Mach-Zehnder modulator bias drifts, maintaining high signal integrity.
  • This approach offers a cost-effective solution for achieving high-frequency wireless signals using lower-frequency RF equipment.