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 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 the subsequent 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 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. 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; - 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 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. - 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 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.