COMPACT ARROW-TYPE VERTICAL COUPLER FILTER

Compact wavelength filter utilizing the vertical coupling between a co nventional ridge waveguide and a 3-D ARROW is proposed and demonstrate d, Compact size and narrowband performance are achieved utilizing the large difference of waveguide dispersion between the 3-D ARROW and the ridge waveguide at single mode, A polyimide ridge waveguide was stack ed on a stripe lateral confinement ARROW in an intersecting configurat ion with the interaction length of about 1 mm, and -3-dB linewidth of 5.5 nn was experimentally achieved.