Single polarization fiber and method of evaluating fiber...

Optical waveguides – Optical fiber waveguide with cladding

Reexamination Certificate

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Reexamination Certificate

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07424194

ABSTRACT:
A method for measuring fundamental mode cutoff wavelength of single polarization fiber comprising: (i) launching pulsed light of at least one wavelength λiinto one end of the single polarization fiber; (ii) measuring backscattered light intensity corresponding to said wavelength to obtain the backscattered light intensity as a function of fiber position, wherein the backscattered light propagates through the same end of the fiber; and (iii) determining at least one cutoff wavelength and the corresponding position within said fiber for the cutoff wavelength, based on a specified threshold light intensity level.

REFERENCES:
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patent: 6946646 (2005-09-01), Chen et al.
patent: 2002/0069677 (2002-06-01), Berkey
patent: 2005/0244118 (2005-11-01), Berkey et al.
“A Broad-Band Single Polarization Optical Fiber”, Michael J. Messerly, et al; Journal of Lightwave Technology; vol. 9, No. 7, Jul. 1991, pp. 817-820.
A Single-Polarization Fiber:, J. R. Simpson, et al; Journal of Lightwave Technology, vol. LT-1, No. 2, Jun. 1983; pp. 370-374.
“Stress-Induced Single-Polarization Single-Mode Fiber”, W. Eickhoff; Optics Letters, Dec. 1982; vol. 7, No. 12; pp. 629-631.
“Photonic Crystal Fiber”; Hirokazu Kubota; Proc. of SPIE vol. 5623; pp. 292-297.
“Broadband Single-Polarization Photonic Crystal Fiber”; J. R. Folkenberg, et al; Optics Letters, vol. 30, No. 12; Jun. 15, 2005.

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