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:
Sep. 05, 1995
Filed:
Aug. 31, 1993
Takehiro Fukushima, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A photo isolator transmits light of a frequency fo in the normal direction and substantially intercepts the light in the reverse direction. A phase modulator comprising an optical crystal having a refractive index, counter faces and counter electrodes formed on the counter faces. The phase modulator receives an electrical signal having a frequency of .DELTA.f or higher and changes the refractive index of the optical crystal by the Pockels effect. A narrow band pass filter has a half band width of .DELTA.f, is mounted on an optical axis, and substantially transmits light having frequency of from (fo-.DELTA.f) to (fo+.DELTA.f). The phase modulator is juxtaposed with the narrow band pass filter on the optical axis.