Title :
Superimposed phase gratings in planar optical waveguides for wavelength demultiplexing applications
Author :
Minier, V. ; Kévorkian, A. ; Xu, J.M.
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
fDate :
3/1/1993 12:00:00 AM
Abstract :
A theoretical analysis of superimposed phase gratings in planar optical waveguides for wavelength demultiplexing applications is developed. Using coupled-mode theory, it is shown that the coupling between the gratings affects diffraction characteristics for output beams of close angular or wavelength separation. Nevertheless, taking into account the coupling effects and adjusting critical parameters, high-performance devices are found to be achievable in carefully designed structures. The authors predict that wavelength demultiplexers having efficiencies larger than 95%, angular and wavelength separation smaller than 0.2 degrees and 20 AA, respectively, and crosstalk attenuation lower than -40 dB are possible.<>
Keywords :
diffraction gratings; integrated optics; multiplexing equipment; optical communication equipment; optical waveguide theory; wavelength division multiplexing; 95 dB; 95 percent; WDM; close angular separation; coupled-mode theory; coupling effects; crosstalk attenuation; diffraction characteristics; high-performance devices; output beams; planar optical waveguides; superimposed phase gratings; wavelength demultiplexing applications; wavelength division multiplexing; wavelength separation; Demultiplexing; Diffraction gratings; Optical attenuators; Optical coupling; Optical crosstalk; Optical diffraction; Optical planar waveguides; Optical waveguide theory; Optical waveguides; Planar waveguides;
Journal_Title :
Photonics Technology Letters, IEEE
