Comparison of Phase Difference between Zero Phase and FIR Filtering

[wierdlingz]

Hi,

I have a comma-delimited text file containing a 2D array in frequency domain. I would like 2 do a phase difference comparison between the original signal, zero phase filter and FIR filter with a cut-off at 1550nm and sampling of 0.01nm. Ouput will be a graph. I've tried to model after the example in LabVIEW but I can't seem to get the graph to display. Is there an error in the block diagram?

Also, is it possible to do the phase difference comparison via detection of central wavelength? If so, how can I go about it?

Thanks.

[KateB]

When you translate time domain to frequency domain, amplitude information is separated information.

Therefore, there's no way to find phase information from frequency domain data.

You must collect time domain data in order to perform this test.