Title :
Spectral properties of multiple grating structures
Author :
Lawson, R.C. ; Safaai-Jazi, A.
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
Abstract :
Spectral characteristics of multiple periodic gratings in planar dielectric waveguides are investigated using a coupled-mode theory. Gratings are modeled as periodic perturbations in the refractive index profile about the core-cladding boundary of the waveguide. Power coupling between the forward and backward traveling fundamental modes are calculated for cascaded gratings with arbitrary lengths and separations but equal periods. It is shown that extremely narrow spectral widths, smaller than 0.1 nm, can be achieved from two or more cascaded gratings. Variations of power reflection coefficient with wavelength are examined for several cases. Applications of these gratings are also addressed
Keywords :
coupled mode analysis; diffraction gratings; optical planar waveguides; optical waveguide components; optical waveguide filters; optical waveguide theory; backward traveling fundamental modes; cascaded gratings; core-cladding boundary; coupled-mode theory; extremely narrow spectral widths; forward traveling fundamental modes; multiple grating structures; periodic perturbations; planar dielectric waveguides; power coupling; power reflection coefficient; refractive index profile; spectral characteristics; spectral filters; wavelength dependence; Dielectrics; Diode lasers; Dispersion; Fiber gratings; Narrowband; Optical fiber communication; Optical planar waveguides; Optical reflection; Optical waveguides; Planar waveguides;
Conference_Titel :
Southeastcon '97. Engineering new New Century., Proceedings. IEEE
Conference_Location :
Blacksburg, VA
Print_ISBN :
0-7803-3844-8
DOI :
10.1109/SECON.1997.598603
