Abstract
A new method for monitoring the nonlinearities perturbing the optical frequency sweep in high speed tunable laser sources is presented. The swept-frequency monitoring system comprises a Mach-Zehnder interferometer and simple signal processing steps. It has been implemented in a coherent optical frequency domain reflectometer which allowed to drastically reduce the effects of nonlinear sweep, resulting to a spatial resolution enhancement of 30 times.
Highlights
Optical frequency-domain reflectometry (OFDR) has found a great number of applications, typically as a diagnostic and characterization tool for optical fibers, components and systems
The coherent OFDR consists of a tunable laser source (TLS) whose frequency can be swept continuously in time without mode hops and an optical interferometer comprising a reference path and a measurement path
The interferences between the reference signal from reference path and different reflections coming from the device under test (DUT) is electrically detected and a Fourier transform allows the visualization of beat frequencies
Summary
Optical frequency-domain reflectometry (OFDR) has found a great number of applications, typically as a diagnostic and characterization tool for optical fibers, components and systems. Contrary to the previous ones, our new method uses only simple data processing steps and does not require to deal with complex numerical algorithms such as phaseunwrapping With this information, it is possible to suppress the effect of the nonlinear optical frequency sweep on the spatial resolution in a coherent OFDR set-up. The information of the measured optical frequency is used to resample the output of the main interferometer with equidistant frequency intervals In this way, the fast Fourier transform (FFT) algorithm commonly used to realize Fourier transform on the detected interference signal can be realized correctly as a function of the independent variable of interest, namely the instantaneous optical frequency
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