The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 18, 1990
Filed:
Apr. 17, 1989
Scott H Rumbaugh, Lake Oswego, OR (US);
Michael D Jones, Portland, OR (US);
Philip J Bos, Beaverton, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
A state-of-polarization (SOP) control system (10) uses a SOP controller (28) that is responsive to a CPU (24) to perform endless and complete polarization signal detection for a fiber optic communication system. The SOP controller (28) comprises liquid crystal variable optical retarders (40, 42 and 44) that adjust the polarization state of local optical signal (36) in response to voltages provided by the CPU (24). The CPU (24) adjusts the voltage applied to the retarders (40, 42, and 44) separately in response to the magnitude of an interference signal (70), which corresponds to the degree to which the polarization of the local optical signal (36) and an input optical signal (12) are different.