| 主权项 |
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. the drum portion comprising a major drum having a major drum fiber optic cable receiving surface of a first diameter and a minor drum having a second diameter of lesser magnitude than the first diameter,b. the flange portion comprising:
i. a first terminal flange spaced by the drum portion from a second terminal flange and an intermediate flange, each flange in the flange portion extending radially outwardly from the drum portion; the first terminal flange having a first terminal flange fiber optic cable contact surface abutting the major drum fiber optic cable receiving surface,ii. the intermediate flange positioned between the first terminal flange and the second terminal flange and separating the major drum from the minor drum, and having an aperture there through, directly adjacent the major drum fiber optic cable receiving surface, the aperture having a free area sufficient to pass a fiber optic cable length through the intermediate flange from the major drum fiber optic cable receiving surface to the minor drum,iii. the intermediate flange having an intermediate flange fiber optic cable contact surface abutting the major drum fiber optic cable receiving surface,c. each spool made of a material to form a single unitary device having smooth, gap-free contact surfaces including between the first terminal flange fiber optic cable contact surface and the abutting major drum fiber optic cable receiving surface and between the intermediate flange fiber optic contact surface and the abutting major drum fiber optic cable receiving surface; 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. |
