What is the physical dimension of transduction coefficient in photonics?

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The discussion focuses on the physical meaning of signals s1 and s2 in the context of tunable couplers in programmable integrated photonics. It questions whether these signals represent electric field intensity or the phase of electromagnetic waves. The transduction coefficient's physical dimension is noted to be the inverse of the physical dimension of s, leading to confusion regarding its interpretation. It is suggested that since the discussion involves signal phase, the signals s_i should represent amplitudes. Clarification on these concepts is essential for understanding their application in photonics.
jojoe
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I am studying Tunable couplers with Programmable Integrated photonics by Jose Capmany.
In this textbook, what is the physical meaning of signal s1 and s2? Is it an electric field intensity or the phase of electromagnetic wave?
And what is the physical dimension of transduction coefficient here?

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From the formula you referred I observe physical dimension of ##\gamma## is an inverse of physical dimension of s which is not clear to me who has no idea on the context.
 
It seems to be talking about signal phase, so the ##s_i## have to be amplitudes, surely?
 

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