Thin-Film Acoustooptic Devices with Applications to Integrated/Fiber Optic Signal Processing and Communications.
Abstract
Research emphasis for the first program year was placed on the utilization of the wideband guided-wave (thin-film) acoustooptic deflector for spectrum analysis and very high scanning-rate light beam deflection/switching using analog mode of operation. For this purpose a very wideband deflector in a Y-cut LiNbO3 Ti-diffused waveguide was designed and fabricated. This deflector employs a three-element tilted-array transducer with the center frequencies of 275, 432 and 648 MHz, and has a measured deflector bandwidth of 500 MHz. This bandwidth represents the largest that has been achieved thus far. A frequency resolution of 1.0 MHz was measured in a spectrum analysis experiment using a He-Ne (6328 A) laser light beam of 4 mm aperture. In the light beam scanning experiment, a scanning rate of 125 x 10 to the 6th power spots/sec for 50 spots has been achieved. This scanning rate is 170 times larger than that obtainable in the digital mode of operation. Some preliminary experimental study on optimized anisotropic Bragg diffraction involving optical modes of orthogonal polarizations was also carried out. A measured bandwidth of 222 MHz which represents a seven-fold increase over that based on isotropic Bragg diffraction has been demonstrated. Finally, some improvement in the facility for surface acoustic wave transducer fabrication was also made. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1978
- Accession Number
- ADA052949
Entities
People
- Chen S. Tsai
Organizations
- Carnegie Mellon University