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High-birefringence polarizing fiber with flat cladding

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3 Author(s)
Okamoto, K. ; NTT Public Corporation, Tokai, Ibaraki-ken, Japan ; Hosaka, T. ; Noda, J.

This paper presents the theoretical and experimental investigations on polarization characteristics of PANDA fiber with flat cladding. It is theoretically shown that the modal birefringence in the flat-clad fiber is almost the same as that in the circular-clad fiber. The flat-clad PANDA fiber has been fabricated by grinding off the preform cladding on the opposite faces and then drawing with a low furnace temperature. The modal birefringence of the fiber isB = 5.9 times 10^{-4}and the separation of the bending loss edges for the two polarization modes isDeltaupsilon = 0.51in the normalized frequency. The polarizing region can be tuned from 1.3 to 1.56 μm by varying the fiber-bending diameter from 3.5 to 4.5 cm. A 1.5-m length of polarizing fiber exhibits extinction ratios of 44.9 and 44.4 dB with insertion losses for the guided mode of 0.25 and 0.41 dB at 1.3 and 1.56 μm, respectively.

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Lightwave Technology, Journal of  (Volume:3 ,  Issue: 4 )