Asymmetrically Strained Ridge Waveguide for Passive Polarization Conversion

TitleAsymmetrically Strained Ridge Waveguide for Passive Polarization Conversion
Publication TypeJournal Article
Year of Publication2008
AuthorsBull, J. D., H. Kato, and N. A. F. Jaeger
JournalIEEE Photonics Technology Letters
Date PublishedNOV-DEC
Type of ArticleArticle
KeywordsBirefringence, elasto-optic effect, GaAs, mode conversion, passive polarization converter (PPC), ridge waveguide, strain, Stress

A novel passive polarization converter is presented using the elasto-optic effect in a ridge waveguide. A compressively stressed Si3N4 layer is deposited onto one side of the waveguide while a tensile layer is deposited on the opposing side. The average stress of the tensile and compressive layers is used to cancel the modal transverse-electric-transverse-magnetic (TE-TM) birefringence of the ridge waveguide. The difference in the tensile and compressive stresses induces birefringence with principal axes rotated 45 degrees from the TE-TM orientations. The method is demonstrated on an AlGaAs-GaAs waveguide at 1550 run. We measure the orientation of the axes to be 46 degrees +/- 1 degrees, demonstrating that complete mode conversion can be obtained without using periodic phase matching. Complete conversion is obtained in 1.16 mm with a waveguide loss of 0.1 dB/cm. Stability over temperature is also demonstrated.


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