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Bandpass Sampling

Bandpass Sampling

In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...

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Wide-band frequency-modulation system using optical techniques.

D R Huber, B E Adams, J C Clegg

|March 9, 2010

Summary

This summary is machine-generated.

A modified Michelson interferometer generates wide-band frequency modulation (FM) signals using a laser and acoustooptic cell. This system enables multiple communication channels through frequency-division multiplexing.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Published on: March 20, 2017

Quasi-light Storage for Optical Data Packets

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Published on: February 6, 2014

Area of Science:

Optics
Optical Engineering
Signal Processing

Background:

Michelson interferometers are foundational optical devices.
Frequency modulation (FM) and phase modulation (PM) are key communication techniques.
Acoustooptic devices offer versatile signal manipulation capabilities.

Purpose of the Study:

To describe a modified Michelson interferometer for generating wide-band FM signals.
To explore the application of angle modulation for FM and PM.
To investigate system configurations for frequency-division multiplexing.

Main Methods:

Utilizing a laser source.
Employing an acoustooptic cell for frequency shifting.
Incorporating a movable mirror for signal generation.
Implementing angle modulation techniques.

Main Results:

Successful generation of a wide-band FM signal with an 80 MHz center frequency.
Demonstration of angle modulation for producing wide-band FM/PM.
Exploration of system configurations suitable for multiplexing.

Conclusions:

The modified Michelson interferometer is effective for generating wide-band FM signals.
Angle modulation offers a viable method for wide-band signal generation.
The proposed system architecture supports frequency-division multiplexing for enhanced communication capacity.