A recent JEOS-RP publication proposed Comments about Dispersion of Light Waves, and we present here complementary comments for birefringence dispersion in polarization-maintaining (PM) fibers, and for its measurement technique based on channeled spectrum analysis. We start by a study of early seminal papers, and we propose additional explanations to get a simpler understanding of the subject. A geometrical construction is described to relate phase birefringence to group birefringence, and it is applied to the measurement of several kinds of PM fibers using stress-induced photo-elasticity, or shape birefringence. These measurements confirm clearly that the difference between group birefringence and phase birefringence is limited to 15-20% in stress-induced PM fibers (bow-tie, panda, or tiger-eye), but that it can get up to a 3-fold factor with an elliptical-core (E-core) fiber. There is also a surprising result with a solid-core micro-structured PM fiber, that is also based on shape birefringence.
We present a polarizing optical fiber designed to operate at 780 nm with, to date, an unprecedented spectral window. The polarization extinction ratio obtained for a 3 meters long sample of this fiber is greater than 60 dB over a 40 nm window. We will demonstrate these performances by presenting a new method for characterizing the rejection as a function of wavelength. This method presents many advantages; not the least being that it yields rejection values in excess of the individual rejections of polarizers used for the setup.
Strain and temperature sensing with optical fiber rely on strain and temperature coefficient characterization. We deduce these coefficients from Rayleigh-OFDR measurements as well as their dependencies on temperature and fiber parameters.
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