Polarization control system

Patent 5191387 Issued on March 2, 1993. Estimated Expiration Date:

January 3, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2976764

3520617

3645603

Method for controlling a polarization of light
Patent #: 5004312
Issued on: 04/02/1991
Inventor: Shimizu

Broadband Faraday isolator Patent #: 5052786
Issued on: 10/01/1991
Inventor: Schulz

Inventors

Assignee

Ando Electric Co., Ltd.

Application

No. 637096 filed on 01/03/1991

US Classes:

356/34, Attached detector356/364, BY POLARIZED LIGHT EXAMINATION356/368, With electro-optical light rotation385/1TEMPORAL OPTICAL MODULATION WITHIN AN OPTICAL WAVEGUIDE

Examiners

Primary: Rosenberger, Richard A.
Assistant: Pham, Hoa Q.

Attorney, Agent or Firm

Seidel, Gonda, Lavorgna & Monaco

International Classes

G01B 011/18
G01J 004/00

Foreign Application Priority Data

1990-01-10 JP

Abstract

A polarization is controlled by introducing a phase difference in an incident light at first, then introducing a phase difference by 45 degrees, and then the polarized light is rotated. The light is passed through an analyzer so arranged that the direction of the transmission axis of the analyzer does not coincide with the principal axes of the means for introducing the phase differences, thereby to convert the polarized condition into a light volume which is used to control the phase differences and the rotation.