Loading patent…
AssigneeFrance Telecom
InventorsErwan Pincemin, Daniel Hui Bon Hoa, Paulette Gavignet, Christian Dourthe
Estimating the term…
The differential group delay is measured in an optical fiber connection for an optical signal undergoing a phase modulation BPSK or DPSK by a digital signal at a given rate. A polarization controller at an emerging end of the connection scans polarization states of the modulated optical signal. An emulator iteratively introduces an additional delay in the modulated optical signal emerging from the connection and combines the delayed modulated optical signal and the non delayed modulated optical signal which are both polarized along two orthogonal axes into a resulting optical signal. A polarization controller and a fixed polarizer select a polarization state in the resulting optical signal along one of bisecting lines of the orthogonal axes into a linearly polarized signal. An eye diagram or a spectrum of the polarized signal is acquired by a digital oscilloscope or an optical spectrum analyzer to determine the differential group delay.
A method of measuring differential group delay in an optical fiber connection conveying an optical signal modulated by a digital signal at a given rate, said method including:
A system for measuring differential group delay of an optical fiber connection conveying a modulated optical signal at a given rate, said system including:
A digital oscilloscope in a system for measuring differential group delay of an optical fiber connection conveying a optical signal modulated by a digital signal at a given rate, including:
An optical spectrum analyzer in a system for measuring differential group delay of an optical fiber connection conveying a optical signal modulated by a digital signal at a given rate, including:
Dependencies are inferred from the claim text.