Abstract

Coupling characteristics for designing a LiNbO₃ directional coupler fabricated by Ti diffusion have been investigated with a modified WKB method. The present analysis is verified by comparing the refractive-index change in the Ti-diffused LiNbCO₃ waveguide derived from direct measurement and coupling length calculation. Coupling length variations due to refractive-index change, diffusion length waveguide spacing, and wavelength are described. Tolerances in coupling length mismatch and propagation constant differences affecting cross talk of the directional coupler are discussed.

© 1981 Optical Society of America

Coupling characteristics of a diffused channel-waveguide directional coupler

Uma Jain, Anurag Sharma, K. Thyagarajan, and A. K. Ghatak
J. Opt. Soc. Am. 72(11) 1545-1549 (1982)

Polarization dependence in Ti-diffused LiNbO₃ directional couplers

Donghua Gu, Ohannes Eknoyan, and Henry F. Taylor
Appl. Opt. 41(1) 74-77 (2002)

Coupling characteristics of LiNbO₃ directional couplers

Craig T. Mueller and Elsa Garmire
Appl. Opt. 24(17) 2846-2850 (1985)

Precise determination of refractive index and thickness in the Ti-diffused LiNbO₃ waveguide

Juichi Noda, Makoto Minakata, Shoichi Saito, and Naoya Uchida
J. Opt. Soc. Am. 68(12) 1690-1693 (1978)

Electrooptic-photorefractive modulation in Ti:LiNbO₃ waveguides

W. S. Goruk, P. J. Vella, R. Normandin, and G. I. Stegeman
Appl. Opt. 20(23) 4024-4027 (1981)