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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Published on: December 3, 2013

Frequency domain optical reflectometer using a Gaas optoelectronic mixer.

R I Macdonald, B E Swekla

|June 26, 2010

Summary

This summary is machine-generated.

This study introduces a novel frequency domain optical reflectometer using a GaAs photodetector for simplified, remote refractive index measurements. The technique achieves 10m resolution with basic electronics, enabling detection of distant optical reflections.

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Area of Science:

Optical Engineering
Photonics
Metrology

Background:

Traditional reflectometers often require complex electronics for signal processing.
Pulsed or swept frequency reflectometers typically employ electronic mixing, increasing system complexity.

Purpose of the Study:

To describe a simplified frequency domain optical reflectometer.
To enable remote refractive index measurement in fluids using optical fiber sensors.

Main Methods:

Utilized a Gallium Arsenide (GaAs) interdigital photodetector for both optical detection and signal mixing.
Employed a simple receiver with a postdetection bandwidth of approximately 10 kHz.
Leveraged Fresnel reflection from a square-cleaved fiber as the sensing element.

Main Results:

Achieved a distance resolution of 10 meters.
Demonstrated the capability to detect discrete optical reflections as low as -57 dB at a distance of 1 km.
Significantly simplified electronic requirements compared to existing reflectometry techniques.

Conclusions:

The developed frequency domain optical reflectometer offers a simplified and effective approach for remote sensing applications.
The use of a GaAs photodetector for integrated detection and mixing reduces hardware complexity and cost.
This technique is well-suited for non-contact, remote measurement of fluid refractive indices.