the light within the guiding core in one embodiment the light is confined from both the internal and the external sides of the device forming a guiding channel or just by the external side forming a disk resonator although the perfectly circular shape is generally preferred the resonator could be of any closed loop shape such as an ellipse etc although not mentioned explicitly throughout the text the bragg reflectors can of any type of distributed reflector such as for example a photonic bandgap crystal where the bragg reflector is constructed by series of holes in a dielectric material the resonator structure can be used in various applications such as optical filters lasers modulators spectrum analyzers wavelockers interleave filters and optical add drop multiplexers application_number US 76697404 A description 0035 fig1 a 1c are diagrams which illustrate the prior art ring resonator structure fig1 a and 1b are top plan view diagrams which show structures utilizing respectively a ring resonator 100 and a disk resonator 102 fig1 c is a perspective diagram which shows a structure utilizing circular resonator 104 and a multi layer approach such as described in u201c vertically coupled glass microring resonator channel dropping filters u201d b e little et al ieee photonics technology letters vol 11 no 2 february 1999 p 215 217 referring to fig2 a 2d the resonator 20 according to the invention is illustrated by example in several embodiments in top plan view in the embodiment of fig2 a resonator 20.