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:
Jul. 06, 2004
Filed:
Jan. 17, 2003
Jacob M. Hammer, Annapolis, MD (US);
Photodigm, Inc., Richardson, TX (US);
Abstract
An exemplary optical isolator, which may use a magnetic-composite material made of a ferromagnetic-composite, and method for making the same are provided. The optical isolator may include a core, a cladding, and a magnetic-composite material. The core is operable to allow a light wave incident a first end to propagate to a second end to define a positive propagation direction, and to allow a light wave incident the second end to propagate to the first end to define a negative propagation direction. The cladding is positioned relative the core and includes a thinned segment of the cladding with a cladding thickness operable to allow an optical field penetration through the thinned segment of the cladding by a light wave that propagates either in the positive or negative propagation direction. The thinned segment has a length that extends relative to a portion of the core. The magnetic-composite material is provided in the presence of a magnetic field, such as a static magnetic field, in a direction perpendicular to the positive propagation direction of the core, and is positioned relative the thinned segment to receive the optical field penetration through the thinned segment. The magnetic-composite material having a thickness and an index of refraction to attenuate a light wave that propagates in the portion of the core in the negative propagation direction more than the attenuation of a light wave that propagates in the portion of the core in the positive propagation direction.