Patent
1988-09-16
1990-04-10
Sikes, William L.
350 9629, G02B 602, G02B 626
Patent
active
049154680
ABSTRACT:
An apparatus utilizes a two-mode optical waveguide with a non-circular core to provide stable spatial intensity patterns in both propagation modes for light propagating therein. The light has a wavelength, and the non-circular core has cross-sectional dimensions selected such that (1) the waveguide propagates light at that wavelength in a fundamental mode and a higher order mode, and (2) substantially all of the light in the higher order mode propagates in only a single, stable intensity pattern. Embodiments of the invention include, for example, modal couplers, frequency shifters, mode selectors and interferometers. One of the interferometer embodiments may be used as a strain gauge.
REFERENCES:
patent: 4536058 (1985-08-01), Shaw et al.
patent: 4556279 (1985-12-01), Shaw et al.
patent: 4669814 (1987-06-01), Dyott
patent: 4679894 (1987-07-01), Pavlath
patent: 4684215 (1987-08-01), Shaw et al.
patent: 4699513 (1987-10-01), Brooks et al.
patent: 4735484 (1988-04-01), Fesler
patent: 4735485 (1988-04-01), Shaw et al.
patent: 4741586 (1988-05-01), Kim et al.
patent: 4768851 (1988-09-01), Shaw et al.
W. P. Risk et al., "Single-Sideband Frequency Shifting in Birefringent Optical Fiber," SPIE vol. 478-Fiber Optic and Laser Sensors II (1984), pp. 91-97.
D. Gloge, "Weakly Guiding Fibers," APPLIED OPTICS, vol. 10, No. 10, Oct. 1971, pp. 2252-2258.
Masaaki Imai et al., "Excitation of the Fundamental and Low-Order Modes of Optical Fiber Waveguides with Gaussian Beams. 2: Offset Beams," APPLIED OPTICS, vol. 14, No. 1, Jan. 1975, pp. 169-173.
M. R. Layton et al., "Optical Fiber Acoustic Sensor Utilizing Mode-Mode Interference," APPLIED OPTICS, vol. 18, No. 5, Mar. 1, 1979, pp. 666-670.
Thomas G. Giallorenzi et al., "Otical Fiber Sensor Technology," IEEE JOURNAL OF QUANTUM ELECTRONICS, vol. QE-18, No. 4, Apr. 1982, pp. 626-665.
Michel J. F. Digonnet et al., "Analysis of a Tunable Single Mode Optical Fiber Coupler," IEEE JOURNAL OF QUANTUM ELECTRONICS, vol. QE-18, No. 4, Apr. 1982, pp. 746-754.
Toshihiko Yoshino et al., "Fiber-Optic Fabry-Perot Interferometer and Its Sensor Applications," IEEE Journal of Quantum Electronics, vol. QE-18, Oct. 1982, pp. 1624-1633.
Allen W. Snyder et al., "Optical Waveguide Theory," Section 18-10, Modes of perturbed fibers; Example: Elliptical deformation, Chapman and Hall, N.Y. (ISBN 0-412-09959-0), 1983, pp. 382-387.
G. Meltz et al., "Cross-Talk Fiber-Optic Temperature Sensor," APPLIED OPTICS, vol. 22, No. 3, Feb. 1, 1983, pp. 464-477.
S. C. Rashleigh, "Polarimetric Sensors: Exploiting the Axial Stress in High Birefringence Fibers," Digest of the First International Conference on Optical Fibre Sensors, London, England, Apr. 26-28, 1983, pp. 210-213.
S. C. Rashleight et al., "Perservation of Polarization in Single-Mode Fibers," Laser Focus With Fiberoptic Technology, vol. 19, No. 5, May 1983, pp. 155-161.
K. Nosu et al., "Acousto-Optic Frequency Shifter for Single-Mode Fibers," Electronic Letters, vol. 19, No. 20, Sep. 29, 1983, pp. 816-818.
R. C. Youngquist et al., "Two Mode Fiber Modal Coupler," Optics Letters, vol. 9, No. 5, May 1984, pp. 177-179.
W. P. Risk et al., "Acousto-Optic Frequency Shifting in Birefringent Fiber," OPTICS LETTERS, vol. 9, No. 7, Jul. 1984, pp. 309-311.
Henry F. Taylor, "bending Effects in Optical Fibers," Journal of Lightwave Technology, vol. LT-2, No. 5, Oct. 1984, pp. 617-628.
R. C. Youngquist et al., "All-Fibre Component Using Periodic Coupling," IEEE Proceedings, vol. 132, Pt. J, No. 5, Oct. 1985, pp. 277-286.
W. V. Sorin et al, "Phase-Velocity Measurements Using Prism Output Coupling for Single-and Few-Mode Optical Fibers," OPTICS LETTERS, vol. 11, No. 2, Feb. 1986, pp. 106-108.
J. N. Blake et al., "Fiber-Optic Modal Coupler Using Periodic Microbending," OPTICS LETTERS, vol. 11, No. 3, Mar. 1986, pp. 177-179.
Allan W. Snyder et al., "Optical Fibers of Arbitrary Cross Sections," Journal of the Optical Society of America-A, vol. 3, No. 5, May 1986, pp. 600-609.
B. Y. Kim et al., "All-Fiber Acousto-Optic Frequency Shifter," OPTICS LETTERS, vol. 11, No. 6, Jun. 1986, pp. 389-391.
W. V. Sorin et al., "Highly Selective Evanescent Modal Filter for Two-Mode Optical Fibers," OPTICS LETTERS, vol. 11, No. 9, Sep. 1986, pp. 581-583.
J. N. Blake et al., "All-Fiber Acousto-Optic Frequency Shifter Using Two-Mode Fiber," Proceedings of the SPIE, vol. 719, 1986, pp. 92-100.
W. V. Sorin et al., "A Single-Mode Fiber Evanescent Grating Reflector," Journal of Lightwave Technology, vol. LT-3, No. 5, Oct. 1985, pp. 1041-1043.
J. N. Blake et al., "Elliptical Core Two-Mode Fiber Strain Gauge," SPIE vol. 838, Fiber Optic and Laser Sensors V, Aug. 17-19, 1987, San Diego, pp. 332-339.
B. Y. Kim et al., "Use of Highly Elliptical Core Fibers for Two-Mode Fiber Devices," Optics Letters, vol. 12, Sep. 1987, pp. 729-731.
J. N. Blake et al., "Strain Effects on Highly Elliptical Core Two-Mode Fibers," OPTICS LETTERS, vol. 12, Sep. 1987, pp. 732-734.
J. N. Blake et al., "Elliptical Core Two-Mode Fiber Strain Gauge with Heterodyne Detection," Optical Fiber Sensors, 1988 Technical Digest Series, vol. 2, Part 2, presented at Optical Fibers Topical Meeting, Jan. 27-29, 1988, New Orleans, pp. 416-419.
H. E. Engan et al., "Propagation and Optical Interaction of Guided Acoustic Waves in Two-Mode Optical Fibers," Journal of Lightwave Technology, vol. 6, No. 3, Mar. 1988, pp. 428-436.
Blake James N.
Kim Byoung Y.
Sikes William L.
The Board of Trustees of the Leland Stanford Junior University
Ullah Akm E.
LandOfFree
Apparatus using two-mode optical waveguide with non-circular cor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus using two-mode optical waveguide with non-circular cor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus using two-mode optical waveguide with non-circular cor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2295491