Analytical model for computing propagation constant of Ti:LiNbO3 periodically segmented waveguides by effective-index-based matrix method

Rabindra Nath Chakraborty; J. C. Biswas; S. K. Lahiri

doi:10.1117/1.1595103

1 September 2003 Analytical model for computing propagation constant of Ti:LiNbO₃ periodically segmented waveguides by effective-index-based matrix method

Rabindra Nath Chakraborty, J. C. Biswas, S. K. Lahiri

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Optical Engineering, Vol. 42, Issue 9, (September 2003). https://doi.org/10.1117/1.1595103

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.

©(2003) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Rabindra Nath Chakraborty, J. C. Biswas, and S. K. Lahiri "Analytical model for computing propagation constant of Ti:LiNbO₃ periodically segmented waveguides by effective-index-based matrix method," Optical Engineering 42(9), (1 September 2003). https://doi.org/10.1117/1.1595103

Published: 1 September 2003

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