Method of measuring time delays with respect to differential mode delay (DMD) of a multi-mode fiber (MMF) or a few-mode fiber (FMF)
AssigneeDraka Comteq B.V.
InventorsFranciscus Johannes Achten, Denis Molin, Nam Nguyen Thang
Life of this patent
Estimating the term…
Abstract
The invention relates to a method of measuring time delays with respect to differential mode delay of a multi-mode fiber or a few-mode fiber for at least two different wavelengths. The time delays for each wavelength are measured before the single mode fiber is translated to a next radial offset.
Claims20
A method of measuring time delays with respect to Differential Mode Delay, DMD, of a multi-mode fiber, MMF, or a few-mode fiber, FMF, for at least two different wavelengths in a measurement arrangement, said measurement arrangement comprising a laser device arranged to emit laser pulses at said at least two different wavelengths, a single mode fiber, SMF, arranged to couple emitted laser pulses into said MMF or said FMF, a first component arranged to couple laser pulses emitted by said laser device into said SMF, a second component arranged to align said SMF to said MMF or said FMF, a detector module arranged for detecting emitted laser pulses exiting said MMF or said FMF, and a third component arranged to couple said emitted laser pulses exiting said MMF or said FMF to said detector module, said method comprising sequential steps a), b), c):
- a) providing said MMF or said FMF in said measurement arrangement and aligning, by said second component, said SMF to said MMF or said FMF;
- b) performing first measurements with respect to a first radial offset value, by:
- positioning, by said second component, said SMF to said MMF or said FMF at said first radial offset value;
- emitting, by said laser device, said laser pulses at said at least two different wavelengths;
- measuring, by said detector module, said time delays of said emitted laser pulses exiting said MMF or said FMF individually for each of said at least two different wavelengths;
- c) performing second measurements with respect to a further radial offset value, by:
- positioning, by said second component, said SMF to said MMF or said FMF at said further radial offset value, said further radial offset being different from a previous radial offset value;
- emitting, by said laser device, said laser pulses at said at least two different wavelengths;
- measuring, by said detector module, said time delays of said emitted laser pulses exiting said MMF or said FMF individually for each of said at least two different wavelengths.
A method of measuring time delays for at least two different wavelengths via Differential Mode Delay, comprising sequential steps a), b), and c):
- a) coupling a single mode fiber, SMF, to either a multi-mode fiber, MMF, or a few-mode fiber, FMF;
- b) performing first time delay measurements by:
- positioning the SMF to the MMF or the FMF at a first radial offset value;
- simultaneously emitting laser pulses at two or more different wavelengths through the SMF and into either the MMF or the FMF;
- and
- measuring time delays of the laser pulses exiting either the MMF or the FMF for each of the two or more different wavelengths;
- c) performing second time delay measurements by:
- positioning the SMF to the MMF or the FMF at a second radial offset value that differs from the first radial offset value;
- simultaneously emitting laser pulses at two or more different wavelengths through the SMF and into either the MMF or the FMF;
- and
- measuring time delays of the laser pulses exiting either the MMF or the FMF for each of the two or more different wavelengths.
A measurement arrangement for measuring time delays with respect to Differential Mode Delay, DMD, of a multi-mode fiber, MMF, or a few-mode fiber, FMF, for at least two different wavelengths, said measurement arrangement comprising:
- a laser device arranged to emit laser pulses at said at least two different wavelengths,
- a single mode fiber, SMF, arranged to couple emitted laser pulses into said MMF or said FMF,
- a first component arranged to couple laser pulses emitted by said laser device into said SMF,
- a second component arranged to align said SMF to said MMF or said FMF,
- a detector module arranged for detecting emitted laser pulses exiting said MMF or FMF,
- a third component arranged to couple said emitted laser pulses exiting said MMF or said FMF to said detector module, and
- a control device arranged for controlling sequential steps b) and c):
- b) performing first measurements with respect to a first radial offset value, by:
- positioning, by said second component, said SMF to said MMF or said FMF at said first radial offset value;
- emitting, by said laser device, said laser pulses at said at least two different wavelengths;
- measuring, by said detector module, said time delays of said emitted laser pulses exiting said MMF or said FMF individually for each of said at least two different wavelengths;
- c) performing second measurements with respect to a further radial offset value, by:
- positioning, by said second component, said SMF to said MMF or said FMF at said further radial offset value, said further radial offset being different from a previous radial offset value;
- emitting, by said laser device, said laser pulses at said at least two different wavelengths;
- measuring, by said detector module, said time delays of said emitted laser pulses exiting said MMF or said FMF individually for each of said at least two different wavelengths.
A method of measuring time delays for at least two different wavelengths via Differential Mode Delay, comprising sequential steps a), b), and c):
- a) coupling a single mode fiber, SMF, to either a multi-mode fiber, MMF, or a few-mode fiber, FMF;
- b) performing first time delay measurements by:
- positioning the SMF to the MMF or the FMF at a first radial offset value;
- emitting laser pulses at two or more different wavelengths through the SMF and into either the MMF or the FMF;
- and
- measuring time delays of the laser pulses exiting either the MMF or the FMF for each of the two or more different wavelengths;
- c) performing second time delay measurements by:
- positioning the SMF to the MMF or the FMF at a second radial offset value that differs from the first radial offset value;
- emitting laser pulses at two or more different wavelengths through the SMF and into either the MMF or the FMF;
- and
- measuring time delays of the laser pulses exiting either the MMF or the FMF for each of the two or more different wavelengths.
Dependencies are inferred from the claim text.