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How to calculate mode overlap with I(x,y) rather than E(x,y)

  1. Feb 23, 2015 #1
    Hi

    I have a waveguide that is rectangular and multimode that I but-couple to a standard telecom SMF28 fiber. I have imaged the output of the waveguide and the fiber with a 25X microscope objective onto the chip of an IR-camera. Usually the mode overlap is calculated by cross-correlation of the electric field (E(x,y)). Like

    [tex]\eta=\frac{(\int E_1*conj(E_2))^2}{\int |E_1]^2*\int |E_2]^2}[/tex]

    Now however I only have access to the intensity distribution I(x,y).

    What do you think, can I justs take the square root of the intensity and perform the calculation and pretend the imaginary part is equal to zero?
     
    Last edited: Feb 23, 2015
  2. jcsd
  3. Feb 24, 2015 #2
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