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:
Aug. 18, 2015
Filed:
Apr. 05, 2012
Sasha N. Kemmet Oster, Chandler, AZ (US);
Jin-wei Tioh, Ames, IA (US);
Mani Mina, Ames, IA (US);
Robert J. Weber, Des Moines, IA (US);
Sasha N. Kemmet Oster, Chandler, AZ (US);
Jin-Wei Tioh, Ames, IA (US);
Mani Mina, Ames, IA (US);
Robert J. Weber, Des Moines, IA (US);
Iowa State University Research Foundation, Inc., Ames, IA (US);
Abstract
A pre-pulsed magnetic field generation circuit for a fiber-based, magneto-optic (MO) optical modulator or switch for use in an interferometer is provided. The pre-pulsed magnetic field is used to control the amount of rotation in the state of polarization (SOP), and therefore, the ON-OFF extinction ratio. The circuit includes a pair of amplifier circuits that control the current through a coil to generate the pre-pulsed magnetic field. One amplifier controls a magnitude of a steady state portion of the magnetic field, while the other controls both the amplitude and duration of a pre-pulse portion of the magnetic field.