Patent
1981-01-09
1984-01-17
Fisher, Richard V.
65 311, 65 312, 350 9634, G02B 514, C03B 1900
Patent
active
044261292
ABSTRACT:
A glass layer is formed inside a silica glass tube and another glass layer having a refractive index higher than that of the abovementioned glass layer is formed on said glass layer. After these glass layers are formed, one end of the glass tube is collapsed. While the internal pressure of the glass tube is being reduced below the atmospheric pressure, the glass tube is caused to collapse by heating, thereby yielding a preform for an optical fiber. The optical fiber produced from this preform has the difference in the refractive indices of the two orthogonal major axes of at least 1.6.times.10.sup.-4 and maintains the linear polarization plane.
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Ramaswamy et al., "Polarization Characteristics of Noncircular Core Single-Mode Fibers, " Applied Optics, vol. 17, No. 18, Sep. 15, 1978, pp. 3014-3017.
Kaminow et al., "Strain Birefringence In . . . Optical Fibres" Electronic Letters, vol. 15, No. 21, Sep. 13, 1979, pp. 677-679.
Katsuyama Toshio
Matsumura Hiroyoshi
Suganuma Tsuneo
Fisher Richard V.
Hitachi , Ltd.
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