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A single-polarization fiber

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6 Author(s)
Simpson, J.R. ; AT&T Bell Laboratories, Murray Hill, NJ, USA ; Stolen, R.H. ; Sears, F. ; Pleibel, W.
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We report an oPtical fiber which guides only one polarization. This fiber polarizer utilizes high modal birefringence (4.7 times 10^{-4}) to split the two polarizations of the fundamental mode and an ellipitcal depressed-index cladding to provide a steep wavelength-dependent tunneling loss to the fast axis mode. The stress-induced birefringence is created by an elliptical SiO2-B2O2inner cladding. A 4.7-m length of polarizer fiber exhibits an extinction ratio of 34 dB at a wavelength of 633 nm, with polarizing behavior over a bandwidth of 50 nm. Insertion loss of less than 1 dB has been observed for the guided linear-polarization mode. The polarizing band may be shifted from 620 to 525 nm by bending the fiber to a radius of 0.67 cm. Such fiber polarizers should find a variety of applications in fiber sensors, attenuators, isolators, wavelength filters, and tuners.

Published in:

Lightwave Technology, Journal of  (Volume:1 ,  Issue: 2 )

Date of Publication:

June 1983

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