Title :
The wavelength sensor using optical directional coupler
Author :
Somkuarnpanit, S. ; Jaturuntruengsri, S. ; Kunthaweetep, S.
Author_Institution :
Fac. of Eng., King Mongkut´´s Inst. of Technol., Bangkok, Thailand
Abstract :
This paper proposes a wavelength sensor based on an optical directional coupler. The finite-difference time-domain (FDTD) method is used to calculate of the light intensity propagating thorough the structure, and to find the appropriate dimensions of the structure. The device with the width and thickness of 0.4 μm×0.6 μm, which corresponds to the coupling length of 40 μm, would provide a linear relationship between the coupling efficiency against the wavelengths of the transverse-magnetic-mode input. Then, the structure could be employed as a wavelength sensor for wavelength in a range between 1.5 μm and 1.6 μm, with continuous resolution.
Keywords :
finite difference time-domain analysis; optical directional couplers; optical sensors; 0.4 micron; 0.6 micron; 1.5 to 1.6 micron; 40 micron; FDTD method; coupling efficiency; finite-difference time-domain analysis; light intensity calculation; optical directional coupler; transverse-magnetic-mode input; wavelength sensor; Directional couplers; Finite difference methods; Optical coupling; Optical propagation; Optical refraction; Optical sensors; Optical variables control; Refractive index; Signal resolution; Time domain analysis;
Conference_Titel :
Sensors, 2002. Proceedings of IEEE
Print_ISBN :
0-7803-7454-1
DOI :
10.1109/ICSENS.2002.1036993
