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We measured the loss of bend resistant fibres at small bend radii of 1 to 5 mm. A spectral interpolation technique was used to measure the bend loss over 1300–1600 nm range. Fibres with 7.3μm mode field diameter at 1550 nm show <0.4dB/cm at 2 mm radius.
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Tangonan et al. (1989) studied this question.
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