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Related Experiment Video

Updated: Jun 8, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C₂, CN, and TiO Spectra Following Laser-induced Optical Breakdown

Published on: February 14, 2014

Stepped-heterodyne optical complex spectrum analyzer.

D A Reid¹, S G Murdoch, L P Barry

¹Research Institute for Networks and Communications Engineering, School of Electronic Engineering, Dublin City University, Dublin, Ireland.

|October 14, 2010

Summary

This summary is machine-generated.

This study introduces a novel heterodyne measurement for optical signals, simplifying spectral analysis without modulation or electronic clocks. The technique accurately characterizes complex signals, including high-speed and multi-mode optical sources.

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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

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Area of Science:

Optics and Photonics
Signal Processing
Optical Communications

Background:

Characterizing spectral amplitude and phase of optical signals is crucial for high-speed communication systems.
Existing methods often require complex optical modulation or precise electronic clock synchronization.

Purpose of the Study:

To present a simplified heterodyne measurement technique for spectral amplitude and phase of periodic optical signals.
To reduce the complexity and requirements of previous optical signal characterization methods.

Main Methods:

A heterodyne measurement approach was employed without requiring optical modulation of the signal or local oscillator.
The technique relaxes tunability requirements on the optical local oscillator and eliminates the need for a synchronized electronic clock at the receiver.

Main Results:

Successfully measured the spectral amplitude and phase of 20 GHz return-to-zero (RZ) and carrier-suppressed return-to-zero (CSRZ) optical signals.
Characterized a passively mode-locked optical source generating over 100 optical modes.

Conclusions:

The presented heterodyne measurement offers a more practical and less demanding approach for analyzing optical signal spectra.
This technique is suitable for characterizing various complex optical signals, advancing optical signal processing and communication research.