Patent ID: 9228922
Filing Date: 2016-01-05
CPC Classification: G01D,G01M,G02B

Claim Text:
1. In combination with an apparatus for calibrating distance and attenuation parameters of an optical time domain reflectometer (OTDR), a fiber optic cable calibration standard apparatus comprising: a rack mountable enclosure having a front panel and containing therein, a horizontally disposed base plate and three fiber optic cable spool assemblies, in the three fiber optic cable spool assemblies, each assembly comprising a vertically elongated spindle having a lower end fixedly attached to the base plate and an upper end terminated with a cap, and fiber optic cable spools rotatably mounted on the vertically elongated spindle between the base plate and the cap, in the fiber optic cable spools, each spool comprising a drum portion and a flange portion: a first set of fiber optic cable spools comprising: first, second and third, spools, each spool storing a different predetermined length of single-mode fiber optic cable; the first set of fiber optic cable spools mounted on one of the spindles and forming therewith a first fiber optic cable spool assembly; a second set of fiber optic cable spools comprising: fourth, fifth and sixth spools, each spool storing a different predetermined length of multi-mode fiber optic cable; the second set of fiber optic cable spools mounted on one of the spindles and forming therewith a second fiber optic cable spool assembly; a third set of fiber optic cable spools comprising: seventh and eighth single piece spools, each spool storing a predetermined length of single-mode fiber optic cable and multi-mode fiber optic cable, respectively; the third set of spools mounted on one of the spindles and forming therewith a third fiber optic cable spool assembly; first and second input ports each for coupling to one end of the single-mode fiber optic cables stored on a corresponding one of said first, second or third spools; first and second output ports each for coupling to a second end of one of said single-mode fiber optic cables; third and fourth input ports each for coupling to one end of multi-mode fiber optic cables stored on a corresponding one of said first, second or third spools; third and fourth output ports each for coupling to a second end of one of said multi-mode fiber optic cables; a single-mode variable optical attenuator for coupling to one end of a single-mode fiber optic cable stored on said seventh spool; a multi-mode variable optical attenuator for coupling to one end of a multi-mode fiber optic cable stored on said eighth spool; a fifth input port for coupling to a second end of said single-mode fiber optic cable stored on said seventh spool; a sixth input port for coupling to a second end of said multi-mode fiber optic cable stored on said eighth spool; a fifth output port coupled to said single-mode variable optical attenuator; a sixth output port coupled to said multi-mode variable attenuator; a display attached to the front panel, for displaying parameters of fiber optic cables coupled to said input and output ports.