How calculate the extinction ratio (ER) of waveguide ?

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Hassan S. Ashour

to know the difference between different polarizations

read from the following book:

Introduction to Optics 3rd Edition

by Frank L. Pedrotti (Author), Leno S. Pedrotti (Author), Leno M. Pedrotti (Author)

Subhash C Arya

Dear Sabah al-ithawi ,

Please follow this weblink to comprehend polarizations, i.e., TE and TM in the directional coupler. https://s3.amazonaws.com/fip-3/Full-Explorer/index.html

May you please give a reference to your formula of ER mentioned in the document?