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:
Jun. 08, 1993
Filed:
Mar. 06, 1991
Naohiro Tanno, Yamagata, JP;
Pioneer Electric Corporation, , JP;
Abstract
An optical waveguide recording medium has optical waveguides on which minute refractive-index discontinuous portions for generating multiple reflected waveguide lights of different amplitudes and phases can be aligned in accordance with information to be recorded. A recorded-information reproducing apparatus splits a light beam from a light-emitting element into two, guides one of the split beams to the optical waveguides, and causes interference between a signal light reflected after modulation of the amplitude and phase of part of the guided beams and a light acquired by applying a frequency shift to the other beam to obtain an optical heterodyne output, thereby reproducing information recorded as a time-series signal waveform.