Study of utilizing static photoelastic effect in integrated optical devices /
Channel waveguides have been produced in LiNbO 39 LiTaO3,
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1994.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=742464811&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Channel waveguides have been produced in LiNbO 39 LiTaO3, BaTiO3' and BSTN feffoelectric crystals by depositing thick SiO2 films at an elevated temperature and patterning them by combination of reactive ion etching and wet etching. Propagation losses of 0.8 dB/cm and 0.9 dB/cm for TE- and TM- polarization, respectively, were achieved for LiNbO3 at 0.633 lim wavelength, while insertion losses of 8.4 dB and 3.4 dB for TE- and TM- polarization, respectively, were obtained for a waveguide in z-cut BSTN of 5 mm in length at 1.3 [ ] m wavelength. Electrooptic modulations have been demonstrated for LiNbO3 using coplanar electrodes and for BSTN using both coplanar and vertical electrodes. Tunable guided-wave TE<- >TM mode converters with 98% efficiency have been obtained using a periodic, strain inducing SiO2 film on a zinc indiffused LiTaO3 waveguide. The conversion is highly wavelength selective, with a spectral width of 9 nm in a device with interactive length of 5.4 mm. Thermal and electro-optic tuning of the center wavelength were demonstrated. A polarizationindependent electrooptically tunable wavelength filter using passive polarization splatters and strain-induced polarization mode couplers in LiTaO3 has also been realized. Tuning of the center wavelength from 655 nm to 692 nm was demonstrated. An optical bandwidth (FWHM) of 11 nm and a tuning rate of 0.4 nm/V were obtained. |
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| Item Description: | Vita. "Major Subject: Electrical Engineering". |
| Physical Description: | x, 86 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |