Passive fiber-optic polarization control

Details Passive fiber-optic polarization control Passive fiber-optic polarization control

1989-02-16

1990-07-24

Arnold, Bruce Y.

350 9615, 350378, 350400, G02F 119

Patent

active

049431323

ABSTRACT:
A theoretical prediction controls, by a purely passive fiber-optic element, a seemingly uncontrollable linear polarization whose orientation is all but unpredictable. A transformation of an unpredictable polarization orientation into a definite pre-assigned polarization orientation is useful in coherent optical communication and other fiber-optic polarization-dependent systems. A method of making the device utilizes, in a nonconventional way, the presently available fiber-fabrication techniques. A preform of an on-drawing optical fiber of appropriate birefringence is twisted with a monotonously slow-decaying rotational speed. The device is attractive to all obvious advantages inherent to the all-passive nature of the fiber structure.

REFERENCES:
patent: 4389090 (1983-06-01), LeFevre
patent: 4729622 (1988-03-01), Parlath
patent: 4793678 (1988-12-01), Matsumoto et al.
patent: 4801189 (1989-01-01), Shaw et al.
"Weak Coupling Theory of Optical Fiber and Film Waveguides" by Huang Hung-Chia, Radio Science, vol. 16, No. 4, pp. 495-499 (1981).
"Coupled Modes and Nonideal Waveguides" by Huang Hung-Chia, Microwave Research Institute (MRI), Polytechnic Institute of New York, Nov. 1981.

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