Channel Waveguide Study
Abstract
The work described in this report is intended to lead to the demonstration of an efficient, fast electro-optic modulator based on varying the coupling between strip waveguides on a common substrate. An approximate closed- form expression for the cut-off conditions and propagation characteristics of low-order modes in diffused Gaussian strip waveguides is derived. The expression is given in terms of normalized diffusion depths and strip widths and may be used to find the operating point of a LiNb(x)Ta(1-x)O3 strip guide diffused from a Nb strip of known thickness and width. An experimental LiNbxTa(1-x)O3 'directional coupler' has been fabricated by diffusing two 5- micrometer-wide 800-A-thick Nb strips spaced 2 micrometers apart into a LiTaO3 substrate. Reasonably efficient coupling of TM modes between the strips was observed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 1975
- Accession Number
- ADA008581
Entities
People
- C. C. Neil
- J. M. Hammer
- W. Phillips
Organizations
- Sarnoff Corporation