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. 13, 2011
Filed:
Dec. 11, 2007
Takao Tanimoto, Hadano, JP;
Akihito Otani, Atsugi, JP;
Takao Tanimoto, Hadano, JP;
Akihito Otani, Atsugi, JP;
Anritsu Corporation, Atsugi-Shi, JP;
Abstract
An optical signal monitoring apparatus includes an optical interference unit, a sampling optical pulse generation unit, an optical sampling unit, a photoelectric converter, and a computation unit. The optical interference unit includes an optical brancher, a delay device, an optical phase adjuster, and an optical multiplexer. The optical brancher branches a monitoring object signal optical signal phase-modulated at a predetermined symbol rate into two optical paths. The delay device imparts delay corresponding to an integral multiple of one symbol to an optical signal branched in one optical path of the two optical paths. The optical phase adjuster brings an optical signal emitted delay device and an optical signal branched in another optical path of the two optical paths into a predetermined optical phase difference. The optical multiplexer multiplexes the optical signals which are brought into the predetermined optical phase difference, and converts the phase-modulated monitoring object optical signal into intensity-modulated light to emit the intensity-modulated light. The sampling optical pulse generation unit generates a sampling optical pulse having a period which is different from a predetermined offset time to integral multiplication of a symbol clock period corresponding to the predetermined symbol rate. The optical sampling unit samples the intensity-modulated light using the sampling optical pulse and emits an optical pulse signal.