Single-polarization single-mode optical fiber

Details Single-polarization single-mode optical fiber Single-polarization single-mode optical fiber

1982-06-15

1984-11-06

Sikes, William L.

350 9633, G02B 5172

Patent

active

044808976

ABSTRACT:
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 B.sub.2 O.sub.3 wherein a relative refractive index difference .DELTA. between the core and the clad satisfies a relation 0.004.ltoreq..DELTA..ltoreq.0.05, an ellipticity .epsilon. satisfies a relation 0.01.ltoreq..epsilon..ltoreq.0.9, the B.sub.2 O.sub.3 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..sub.x -.beta..sub.y)/k satisfies a relation B=1.times.10.sup.-6 where (.beta..sub.x -.beta..sub.y) represents a propagation constant difference between HE.sub.11.sup.x and HE.sub.11.sup.y modes, and k a wave number in vacuum, whereby a polarization mode dispersion, that is a delay time difference between the HE.sub.11.sup.x and HE.sub.11.sup.y modes which are orthogonal with each other is zero.

REFERENCES:
patent: 4179189 (1979-12-01), Kaminow et al.
patent: 4307938 (1981-12-01), Dyott
patent: 4415230 (1983-11-01), Keck
Hosaka et al., Electronics Letters, vol. 17, No. 15, Jul. 23, 1981, "Low-Loss Single Polarisation . . . ", pp. 530-531.
Hosaka et al., Electronics Letters, vol. 17, No. 5, Mar. 5, 1981, "Single Mode Fibres With . . . ", pp. 191-193.
Okoshi et al., Electronic Letters, vol. 16, No. 18, Aug. 28, 1980, "Single-Polarisation Single-Mode . . . ", pp. 712-713.
"Bending-Induced Birefringence in Single-Mode Fibers", by R. Ulrich Optics Ltt., vol. 5, No. 6, pp. 273-275, 1980.
"Elliptical Dielectric Waveguides", by C. Yah, Journal of Applied Physics, vol. 33, No. 11, pp. 3235-3243, 1962.
"Single-Polarization Optical Fiber Having a Symmetrical Refractive Index Grooves", by Hosaka et al., pp. 43-48, 1981.

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