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Optical Engineering

Analytical model for computing propagation constant of Ti:LiNbO3 periodically segmented waveguides by effective-index-based matrix method
Author(s): Rabindra Nath Chakraborty; J. C. Biswas; S. K. Lahiri
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Paper Abstract

The effective-index-based matrix method (EIMM), which was earlier used to analyze single-mode continuous waveguides, has been also extended to the analysis of periodically segmented waveguides (PSWs) formed by Ti indiffusion in LiNbO3. The Ti-concentration profiles and the induced refractive index changes of Ti:LiNbO3 PSWs have been computed for different waveguide dimensions and fabrication parameters at the design wavelength by using approximate analytical models. The effective index profile of the PSW is obtained by averaging the contributions from different regions along the segments, and EIMM is then applied for computing propagation constants of the PSWs. The cut-off wavelength of PSW has been computed as a function of duty cycle, keeping the period constant. This PSW, when used as one arm of an asymmetric directional coupler (ADC) along with the other arm formed by a continuous waveguide, can be used as a tunable filter.

Paper Details

Date Published: 1 September 2003
PDF: 6 pages
Opt. Eng. 42(9) doi: 10.1117/1.1595103
Published in: Optical Engineering Volume 42, Issue 9
Show Author Affiliations
Rabindra Nath Chakraborty, Univ. of Calcutta (India)
J. C. Biswas, Indian Institute of Technology/Kharagpur (India)
S. K. Lahiri, Indian Institute of Technology (India)

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