Thin-Film Optical Switch.
Abstract
We report the fabrication and evaluation of horn-shaped taper waveguides. Waveguides of linear tapers and straight channels were formed by diffusing a pattern of Ti into LiNbO sub 3 substrate. After diffusion, the interference fringe patterns show that the waveguides have ridges of height of about 3 times the original evaporated Ti film thickness. We found the complete oxidation of Ti before diffusion is important in forming high quality optical waveguides. The waveguide scattering loss is approximately < 1 dB/cm at the He-Ne laser wavelength 6328 angstroms. Taper coupling efficiencies for TE waves at four different taper lengths, 300, 600, 900 and 1200 micrometers, were measured. We determined that the single mode transmission efficiency for 1200 micrometers linear taper was 70% at lamda = 6328 angstroms and 75% at lamda = 5145 angstroms. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1976
- Accession Number
- ADA031518
Entities
People
- Bor Chen
- Gregory Tangonan
Organizations
- HRL Laboratories