Title :
A design method to achieve wide wavelength-flattened responses in the directional coupler-type optical power splitters
Author :
Kishioka, Kiyoshi
Author_Institution :
Dept. of Lightwave Sci., Osaka Electro-Commun. Univ., Japan
fDate :
11/1/2001 12:00:00 AM
Abstract :
A simple design method to achieve wide flattened bandwidths in the directional coupler-type light power splitters is presented, which is applicable both to the three- and two-guide couplers. Couplers with variable differences along the guide axis in the propagation constant between the waveguides are investigated, and the optimum profiles of the variation of the propagation-constant difference are designed for desired given wavelength responses. Designed examples for the three- and two-port splitting operations in the three-guide coupler and for two-port splitting operations in the two-guide coupler are demonstrated, in which the detuning of the propagation constant is assumed to be given by the electrooptic effect in the LiNbO3 used as the substrate
Keywords :
electro-optical effects; lithium compounds; optical beam splitters; optical design techniques; optical directional couplers; optical materials; optical planar waveguides; substrates; titanium; LiNbO3; LiNbO3:Ti; design method; detuning; directional coupler-type light power splitters; directional coupler-type optical power splitters; electrooptic effect; optimum profiles; propagation constant; propagation-constant difference; substrate; three-guide coupler; three-guide couplers; three-port splitting operations; two-guide coupler; two-guide couplers; two-port splitting; two-port splitting operations; variable differences; waveguides; wavelength responses; wide flattened bandwidths; wide wavelength-flattened responses; Bandwidth; Couplers; Design methodology; Equations; Mach-Zehnder interferometers; Optical coupling; Optical interferometry; Optical propagation; Optical waveguides; Propagation constant;
Journal_Title :
Lightwave Technology, Journal of
