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. 22, 1998
Filed:
Mar. 12, 1997
Tomoyuki Nishikawa, Tokyo, JP;
Ando Electric Co., Ltd., Tokyo, JP;
Abstract
A measuring apparatus and a method of operation are presented for rapid and accurate determination of the performance parameters of an optical fiber amplifier. The apparatus primarily includes an optical fiber path 2 having an acousto-optical modulator 3 for modulating reference light and an optical switching device 11 for enabling to bypass the modulator 3, to supply reference light to an optical coupler 5 which divides the reference light into first and second signals. The measuring technique involves: a first step of bypassing the modulator 3 to measure the power level of the second optical signal with an optical powermeter 10; a second step of measuring the power level of the modulated reference light, and then selecting a second optical signal with an optical switch 7 for modulation in another acousto-optical modulator 8, and measuring its output signal; a third step of bypassing the modulator 3 so as to measure the output signal from the modulator 8 with an optical spectrum analyzer 9; a fourth step of measuring the power level of the modulated reference light; and a fifth step of computing a difference between the measured results in steps 1 and 3 to obtain an adjustment value for the reference light, and computing a difference between the measured results in steps 2 and 4 to obtain an adjustment value for the modulated light.