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:
Mar. 30, 1999
Filed:
May. 16, 1997
Peter F Hallemeier, Brookline, MA (US);
Ramar Corporation, Northborough, MA (US);
Abstract
Integrated optic tunable filters (IOTF) which for operation in many different wavelength ranges with different spectral properties. The IOTFs have one or more stages and/or channels formed in birefringent substrates and operate via polarization interferometric effects. Manufacture is via the use of variants of well-known processes used for making high speed integrated optic modulators. The IOTFs are for use in fiber-optic systems, although they can also be implemented in optic systems which are not fiber-optic. Other applications include wavelength division multiplexing, spectral analysis, and source output conditioning. Filtering may be active through the use of externally applied heat, stress, or electric fields.