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:
Oct. 01, 2002
Filed:
Jun. 23, 1999
Siegmar Schmidt, Wildberg, DE;
Bernd Maisenbacher, Schoemberg, DE;
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
A system for determining an optical loss of a device under test DUT includes a fiber coupler for receiving an optical input power (Ps) at a first input, coupling out a stimulus signal at a first output derived from the optical input power (Ps), receiving a response signal on the applied stimulus signal, and for providing a returning optical power (P) at a third output derived from the received response signal. For calibration, a reference cable with a reflectivity R is coupled to the first output of the fiber coupler and a value P of the returning optical power is measured. The reference cable is exchanged for a customer cable, whereby an end of the customer cable is provided in a way that no, or substantially no, reflection occurs, and a value P of the returning optical power is measured. The calibration uses the values R , P , and P . For obtaining the return loss of the DUT, the customer cable is coupled between the first output of the fiber coupler and the DUT, whereby an end of the DUT is provided in a way that no, or substantially no, reflection occurs, and a value P of the returning optical power is measured. The return loss of the DUT can then be determined using the values R , P , P , and P .