Narrowband Bragg reflectors in Ti:LiNbO3 optical waveguides and implantation to optical modulators
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Bragg grating reflectors etched in amorphous silicon overlay films have been integrated with Ti:LiNbO3 optical waveguides. Narrow (0.05 nm) reflectance spectrum with > 20 dB dip in the transmittance spectrum have been obtained at a wavelength of 1542.7 nm for TE polarization. The reflectance in the channel waveguides depends strongly on the depth of the etched grating. The effect of the Bragg waveguide loss factor on the transmittance and reflectance spectra is investigated using a model for contradirectional coupling that includes an attenuation coefficient. Good agreement between model predictions and experimental results is obtained. Applications of such integrated gratings in the fabrication of distributed feedback type and Fabry-Perot type electrooptic intensity modulators, for low switching voltage and high extinction needs, are demonstrated.
author list (cited authors)
Kim, R., Zhang, J., Eknoyan, O., Taylor, H. F., & Smith, T. L.