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Measurement, by channeled spectrum analysis, of group birefringence Bg(λ) of an E-core fiber, over 1000–1650 nm (black square dots); measurement of phase birefringence B at 1550 nm with Bragg grating and Rayleigh-OFDR (red circular dot); phase birefringence B(λ) over 1000–1650 nm (dash red line) deduced by geometrical construction; confirmation of the value of B at 1300 nm with an additional Bragg grating (green circular dot); a photograph of the end face of the fiber, with its illuminated elliptical core, is inserted.
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