Optical waveguides – Optical fiber waveguide with cladding
Patent
1994-10-03
1995-05-23
Gonzalez, Frank
Optical waveguides
Optical fiber waveguide with cladding
385111, 385 11, 65432, 65438, G02B 610
Patent
active
054188814
ABSTRACT:
The presence of (typically unintended) birefringence in single mode optical fiber can severely limit the usefulness of the fiber for, e.g., high bit rate or analog optical fiber communication systems, due to the resulting polarization mode dispersion (PMD). It has now been discovered that PMD can be substantially reduced if, during drawing of the fiber, a torque is applied to the fiber such that a "spin" is impressed on the fiber. Desirably the torque is applied such that the spin impressed on the fiber does not have constant spatial frequency, e.g., has alternately clockwise and counterclockwise helicity. At least a portion of optical fiber according to the invention has spin alternately clockwise and counterclockwise.
REFERENCES:
patent: 4028081 (1977-06-01), Marcatili
patent: 4154049 (1979-05-01), King et al.
patent: 4205899 (1980-06-01), King et al.
patent: 4248035 (1981-02-01), Skillen et al.
patent: 4308045 (1981-12-01), Miller
patent: 4341442 (1982-07-01), Johnson
patent: 4427717 (1984-01-01), Gauthier
patent: 4504300 (1985-03-01), Gauthier et al.
patent: 4509968 (1985-04-01), Arditty et al.
patent: 4556314 (1985-12-01), Stone
patent: 4572840 (1986-02-01), Gombert et al.
patent: 4606605 (1986-08-01), Ashkin et al.
patent: 4884859 (1989-12-01), Yamamoto et al.
patent: 5227623 (1993-07-01), Heffner
Patent Abstracts of Japan, vol. 13, No. 187 (C-592) 2 May 1989 and JP-A-01 014 126 (Hitachi Cable Ltd.) 18 Jan. 1989.
PCT Application: PCT/GB82/00200, filed Jul. 7, 1982, Publication No. WO 83/00232, published Jan. 20, 1983.
"Outer Diameter Measurement of Low Birefringence Optical Fibers by a New Resonant Backscatter Technique", by A. Ashkin et al., Applied Optics, 1 Jul. 1981, vol. 20, No. 13, pp. 2299-2303.
"Birefringence and Polarization Mode-Dispersion in Spun Single-Mode Fibers", by A. J. Barlow et al., Applied Optics, vol. 20, No. 17, Sep. 1, 1981, pp. 2962-2968.
"Preservation of Polarization in Single-Mode Fibers", by S. C. Rashleigh et al., Laser Focus, May 1983 issue, 6 pages.
"Origins and Control of Polarization Effects in Single-Mode Fibers", by S. C. Rashleigh, Journal of Lightwave Technology, vol. LT-1, No. 2, Jun. 1983, pp. 312-331.
"Internal Rotation of the Birefringence Axes in Polarization-Holding Fibers", by M. J. Marrone et al., Optics Letters, vol. 12, No. 1, Jan. 1987, pp. 60-62.
"Technique for Controlling the Internal Rotation of Principal Axes in the Fabrication of Birefringent Fibers", by C. G. Askins et al., Journal of Lightwave Technology, vol. 6, No. 9, Sep. 1988, pp. 1402-1405.
"Fabrication of Circularly Birefringent Single Mode Fibers", by S.C.Rashleigh, Navy Technical Disclosure Bulletin, vol. 5, No. 12 (1980), 8 pages.
European Search Repot, The Hague, Sep. 29, 1993, Examiner J. G. Stroud.
Hart, Jr. Arthur C.
Huff Richard G.
Walker Kenneth L.
AT&T Corp.
Gonzalez Frank
Heartney Palmer Phan Thi
Pacher Eugen E.
LandOfFree
Article comprising optical fiber having low polarization mode di does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Article comprising optical fiber having low polarization mode di, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Article comprising optical fiber having low polarization mode di will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2146688