Title :
Bent waveguide couplers for (de) multiplexing of arbitrary broadly-separated wavelengths using two-mode interference
Author :
Janz, C.F. ; Paiam, M.R. ; Keyworth, B.P. ; Broughton, J.N.
Author_Institution :
Telecommun. Res. Lab., Edmonton, Alta., Canada
Abstract :
A novel technique is presented for the optimization of waveguide couplers configured as broad-band wavelength (de) multiplexers. We show that bending the coupler to an appropriate radius modifies the beat lengths at each wavelength, so that two-mode interference can be used to achieve efficient multiplexing performance with a compact device. Calculated and experimental results for such a device implemented in a silicon oxynitride deeply-etched rib waveguide system are presented. Almost 20-dB and 14-dB contrast are achieved in the demultiplexer configuration at 1550-nm and 850-nm wavelengths, respectively, with a coupler only 145 μm long.
Keywords :
bending; demultiplexing equipment; etching; integrated optics; optical communication equipment; optical couplers; optical fibres; optimisation; rib waveguides; 145 mum; 1550 nm; 850 nm; Si; appropriate radius; arbitrary broadly-separated wavelengths; beat lengths; bent waveguide couplers; compact device; contrast; demultiplexer configuration; demultiplexing; efficient multiplexing performance; integrated optics; optical communications equipment; optimization; silicon oxynitride deeply-etched rib waveguide system; two-mode interference; Couplers; Interference; Optical devices; Optical interferometry; Optical pumping; Optical refraction; Optical waveguides; Propagation constant; Silicon; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
