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Incoherent frequency modulated cw optical reflectometry with centimeter resolution.

S Venkatesh, D W Dolfi

|June 22, 2010

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This study introduces an advanced optical reflectometer for precise fiber optic measurements. It achieves 6.8 cm resolution and a 50-dB dynamic range, enhancing signal analysis capabilities.

Area of Science:

Optoelectronics
Fiber Optics
Signal Processing

Background:

Accurate measurement of optical fiber parameters is crucial for telecommunications and sensing.
Existing reflectometry techniques face limitations in resolution and dynamic range.

Purpose of the Study:

To develop and characterize a novel incoherent, frequency modulated continuous wave (FMCW) optical reflectometer.
To achieve high-resolution and wide dynamic range measurements in optical fibers.

Main Methods:

Utilized a broadband Lithium Niobate (LiNbO3) electrooptic modulator for frequency modulation.
Employed a slow photodiode for optical downconversion and detection.
Implemented a waveform recorder for digital spectrum analysis of the FMCW signal.

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Main Results:

Achieved a two-point resolution of 6.8 cm in optical fiber.
Demonstrated an optical dynamic range of 50 dB, defined by the system noise floor relative to the maximum signal.

Conclusions:

The developed incoherent FMCW optical reflectometer offers significant improvements in measurement precision.
This technology has potential applications in high-performance fiber optic sensing and characterization.