发明名称 |
Method for checking the correct installation of a bend-insensitive optical cable and optical cable suitable for the method thereof |
摘要 |
A method for detecting faulty laying down of an optical cable exhibiting a measured cut-off wavelength includes providing an optical cable for transmitting optical signals including at least one single-mode optical fiber having an attenuation equal to or larger than a first threshold value as measured when wound for one turn around a bending radius equal to or smaller than 5 mm at at least one predetermined test wavelength, the test wavelength being smaller than the measured cut-off wavelength, and an attenuation smaller than a second threshold value as measured when wound for one turn around a bending radius equal to at least a minimum bending radius at an operative wavelength equal to or larger than the measured cut-off wavelength; laying the optical cable; and measuring the attenuation in the at least one optical fiber at the predetermined test wavelength. An optical cable includes at least one optical fiber that is bend sensitive at a predetermined test wavelength not larger than the measured cut-off wavelength and is bend insensitive at an operative wavelength larger than the measured cut-off wavelength, where the cable operates in single-mode regime. |
申请公布号 |
US9097868(B2) |
申请公布日期 |
2015.08.04 |
申请号 |
US201013696424 |
申请日期 |
2010.05.07 |
申请人 |
PRYSMIAN S.P.A |
发明人 |
Ruzzier Marco;Cattelan Susanna;Macchetta Andrea;Collaro Antonio;Caronna Valeria |
分类号 |
G02B6/44;G01M11/08;G01M11/00;G01N21/84 |
主分类号 |
G02B6/44 |
代理机构 |
Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P. |
代理人 |
Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P. |
主权项 |
1. A method for detecting faulty laying down of an optical cable exhibiting a measured cut-off wavelength, measured after propagation over a cable length, comprising:
providing an optical cable for transmitting optical signals comprising at least one single-mode optical fiber having an attenuation equal to or larger than a first threshold value as measured when wound for one turn around a bending radius equal to or smaller than 5 mm at at least one predetermined test wavelength, the test wavelength being smaller than the measured cut-off wavelength and an attenuation smaller than a second threshold value as measured when wound for one turn around a bending radius equal to at least a minimum bending radius at an operative wavelength equal to or larger than the measured cut-off wavelength; laying the optical cable; and measuring the attenuation in the at least one optical fiber at the predetermined test wavelength. |
地址 |
Milan IT |