Electro-optic guided-to-radiation mode conversion in annealed proton-exchanged PPLN waveguides

J. W. Chang, Y. H. Chen, Q. H. Tseng, W. K. Chang, S. L. Deng, C. S. Hsieh

Research output: Contribution to journalArticlepeer-review


We report the design and experimental demonstration of electro-optically active TM-guided to TE-radiation mode converters in annealed proton-exchanged (APE) periodically poled lithium niobate (PPLN) channel waveguides in telecom S-C-L bands (1495-1640 nm). A maximum mode conversion efficiency of >95%/cm was obtained at 1520 nm from a 24-μm-period APE PPLN waveguide under an electro-optic (EO) field of ̃6.3 V/μm at 35°C. This efficiency has been enhanced by a factor of >4.6 over a waveguide built in the single-domain (unpoled) LiNbO3; it is also to the best of our knowledge the most efficient guided-to-radiation (GTR) mode converter ever reported based on LiNbO3 on-axis waveguides. A conversion bandwidth of ̃250 nm was also observed from this EO GTR mode converter.

Original languageEnglish
Pages (from-to)24706-24714
Number of pages9
JournalOptics Express
Issue number24
StatePublished - 22 Nov 2010


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