Experimental characterization of coupled waveguides by normal-mode excitation

Dan Scarlat*, Shlomo Ruschin, David Brooks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We present a novel method for measuring the coupling coefficient of a symmetric directional coupler, based on the direct excitation of the normal modes of the entire structure. The output-power distribution at different coupling lengths was related to the experimentally measured normal modes in order to find the coupling coefficient. The device was alternatively characterized by means of the individual-waveguide modes according to coupled-mode theory in the strong-coupling regime. Both methods were implemented on single-mode directional couplers in Ti : LiNbO3. The validity and accuracy of both approaches are discussed.

Original languageEnglish
Pages (from-to)1132-1140
Number of pages9
JournalIEEE Journal of Quantum Electronics
Issue number7
StatePublished - Jul 1996


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