Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1986-02-13
1988-03-29
Lee, John
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
350 9615, 350 9630, 350375, 350376, 324244, 356351, G02B 616
Patent
active
047339381
ABSTRACT:
A single, continuous strand of fiber optic material is wrapped about a mandrel to form oval-shaped loops having parallel sides and curved ends. A magnet is positioned so that its B-field is substantially parallel to the straight portions of the loops. As light propagates through these straight portions of the loops, its direction of polarization is rotated in accordance with the Faraday effect. The curved portions are formed to create sufficient linear birefrigence to provide a phase difference of 180 degrees between light in the two orthogonal polarization modes of the fiber. This advantageously causes the Faraday rotations in each of the straight portions to add, rather than cancel. The magneto-optic rotator of the present invention is useful in a variety of applications such as an optical isolator, a modulator, and a magnetometer.
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A. Papp and H. Harms, "Polarization Optics of Liquid-Core Optical Fibers", Applied Optics, vol. 16, No. 5 (May 1977), pp. 1315-1319.
S. C. Rashleigh, et al., "Magneto-Optic Current Sensing With Birefringent Fibers", Applied Physics Letters, vol. 34, No. 11, Jun. 1979, pp. 768-770.
H. C. Lefevre, "Single-Mode Fibre Fractional Wave Devices and Polarisation Controllers", Electronics Letters, vol. 16, No. 20, Sep. 1980, pp. 778-780.
Bergh Ralph A.
Lefevre Herve C.
Gonzalez Frank
Lee John
The Board of Trustees of the Leland Stanford Junior University
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