South African Journal of Science
On-line version ISSN 1996-7489
KRITZINGER, Ronnie; MEYER, Johan and BURGER, Johan. Investigation of the power coupling of novel wavelength-selective couplers incorporating axially symmetric long-period fibre gratings. S. Afr. j. sci. [online]. 2011, vol.107, n.5-6, pp. 70-76. ISSN 1996-7489. http://dx.doi.org/10.4102/sajs.v107i5/6.400.
Evanescent-field coupling was studied experimentally in novel optical-fibre-based wavelength-selective couplers, using axially symmetric long-period fibre grating (LPFG) structures. The coupling characteristics of a wavelength-selective coupler at the resonant wavelength were investigated for different LPFG offset distances. It was shown that the wavelength-selective couplers effectively transferred light power at the LPFG resonant wavelength from one fibre to another. The performance of the couplers was consistent with simulations performed in MATLAB using coupled-mode theory.