Comments about birefringence dispersion, with group and phase birefringence measurements in polarization-maintaining fibers

JOURNAL OF THE EUROPEAN OPTICAL SOCIETY-RAPID PUBLICATIONS(2023)

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摘要
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 techniques 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 are also surprising results with solid-core micro-structured PM fibers, that are based on shape birefringence, as E-core fibers.
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关键词
Birefringence,Birefringence dispersion,Channeled-spectrum analysis,Group birefringence,Phase birefringence,Polarization-maintaining fiber,Polarization-mode dispersion
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