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. 29, 1999
Filed:
Jan. 23, 1997
Fujitsu Co. Ltd., Kawasaki, JP;
Abstract
An optical time-division multiplexer in which the phase difference between two optical signals to be used for the synthesis of an output optical signal thereof is maintained at a constant value, regardless of variations in accuracy of the manufacture thereof. Thereby, stable output optical signals are obtained at all times. The optical time-division multiplexer includes first and second optical modulators to respectively output first and second optical modulation signals synchronized with a clock signal and corresponding to different time slots, respectively; an optical coupler for performing time-division multiplexing of the first and second optical modulation signals respectively outputted by the first and second optical modulators; and an optical-phase adjusting unit to receive at least one of the first and second optical modulation signals and to regulate an optical phase of the inputted optical signal. The phase difference between the first and second optical modulation signals inputted to the optical coupler is adjusted by the optical-phase adjusting unit to a desired value to obtain a desired output optical signal.