versus of Fiber Bragg Grating

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Does anyone know why some commercial Fiber Bragg Gratings come with a
specifically designed Input/Output? Is not the FBG a reciprocal
component, so that the response should be the same on both ports?

Thanks

G.

Re: versus of Fiber Bragg Grating
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A FBG is only reciprocal if you consider only coupling between the
forward and backward fundamental mode. Umfortunately there is also
coupling to cladding modes. This especially a problem if you are dealing
with chirped grating were the coupling to the backward fundamental mode
and the coupling to cladding modes can spectrally overlap.




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Ciao , Frank.



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