E. Marin et al., Bragg gratings in 2 x 2 symmetric fused fiber couplers: Influence of the tilt on the wavelength response, IEEE PHOTON, 11(11), 1999, pp. 1434-1436
In this letter, we present a theoretical study on the effect of the angle o
f a tilted Bragg grating written in a 2 x 2 symmetric fused fiber coupler.
Coupling coefficients and wavelength response curves show that the grating
angle is critical in determining the behavior of the component. For a parti
cular type of coupler, a tilt of 0.4 degrees is sufficient to degrade compo
nent performance.