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Upsampling

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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...

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In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.

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Related Experiment Video

Updated: Jun 20, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Synchronous sampling demodulation scheme for nonlinear fiber-optic sensors.

K P Koo, F Bucholtz, A Dandridge

|September 10, 2009

Summary

A novel demodulation scheme enhances nonlinear fiber-optic sensors using synchronous sampling. This technique achieved a minimum detectable magnetic field sensitivity of less than 4 x 10(-5) Oe in a fiber-optic magnetometer.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

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Last Updated: Jun 20, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Area of Science:

Optics and Photonics
Sensor Technology
Magnetometry

Background:

Nonlinear fiber-optic sensors offer unique advantages but face challenges in signal demodulation.
Accurate detection of weak magnetic fields is crucial for various scientific and industrial applications.

Purpose of the Study:

To propose and demonstrate a new demodulation scheme for nonlinear fiber-optic sensors.
To improve the sensitivity and performance of fiber-optic magnetometers.

Main Methods:

Development of a novel demodulation scheme employing synchronous sampling.
Implementation and testing of the scheme in a fiber-optic magnetometer.

Main Results:

Successful demonstration of the proposed demodulation scheme.
Achieved a minimum detectable magnetic field sensitivity below 4 x 10(-5) Oe.

Conclusions:

The synchronous sampling-based demodulation scheme is effective for nonlinear fiber-optic sensors.
This advancement significantly enhances the capabilities of fiber-optic magnetometers for sensitive magnetic field detection.