G - Physics – 02 – B
Patent
G - Physics
02
B
88/97
G02B 6/10 (2006.01)
Patent
CA 1181274
Abstract of the Disclosure A single-polarization single mode optical fiber of the type comprising an elliptical core, a pair of stress applying parts on both sides of the minor radius of the elliptical core for applying asymmetrical stress thereto and a clad embedding therein the core and the stress applying parts, the stress applying parts being made of B2O3 wherein a relative refractive index difference .DELTA. between the core and the clad satisfies a relation 0.004 ? .DELTA. ? 0.05, an ellipticity .epsilon. satisfies a relation 0.01 ? .epsilon. ? 0.9, the B2O3 has a molar concentration of 1 to 25 mole %, ratio of thickness of the stress applying parts and the core is 5 to 15, a modal birefringence B expressed by an equation B = ( .beta. x - .beta. y)/k satisfies a relation B ? 1 x 10-6 where (.beta. x - .beta. y) represents a propagation constant difference between HE?1 and HE?1 modes, and k a wave number in vacuum, whereby a polarization mode dispersion, that is a delay time difference between the HE?1 and HE?1 modes which are orthogonal with each other is zero.
407783
Edahiro Takao
Hosaka Toshihito
Noda Juichi
Okamoto Katsunari
Sasaki Yutaka
Macrae & Co.
Nippon Telegraph & Telephone Public Corporation
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