Optical waveguides – Polarization without modulation
Patent
1990-06-20
1992-03-17
Lee, John D.
Optical waveguides
Polarization without modulation
385123, 359485, 359488, G02B 616
Patent
active
050963120
ABSTRACT:
A fiber-optic fabrication method is used for making the passive fiber-optic polarization control element capable of transforming an arbitrarily oriented linear polarization of light to a desired specific orientation, as so predicted by the super-mode theory. Central to this method is to locally heat and spin an anisotropic optical fiber with a variable spinning speed which is sufficiently high initially and which, as the micro-heater moves along the length of the fiber, drops slowly and monotonously to zero in a total length of about 10.sup.2 times the unspun-state beat length of the anisotropic fiber. Moreover, a linearly polarized light of definite, not unpredictable orientation, can be transformed simply with the aid of a half-wave plate, for example, to other desired SOPs (states of polarization) at the output.
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patent: 4793678 (1988-12-01), Matsumoto et al.
patent: 4801189 (1989-01-01), Shaw et al.
patent: 4943132 (1990-07-01), Huang
"Weak Coupling Theory of Optical Fiber and Film Waveguides" Huang, Radio Science vol. 16 #4, pp. 495-499, 1981.
"Coupled Modes and Nonideal Waveguides", Huang, Microwave Research Institute, Polytechnic Institute of New York, 1981.
Barns Stephen W.
Lee John D.
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