The goal of the proposed Phase I work is to demonstrate the feasibility of developing 1.55 mm WDM tunable filters by using photonic band crystal, and to establish the technical foundation for the fabrication of the tunable filter. This proposed innovative approach will permit the development of integrated microscale tunable filters based on Si technology. It has the following characteristics; i) Device size can be drastically reduced to the 10 ìm scale, which is at least three orders of magnitude smaller in area, ii) Alignment of the optical fiber at the input and output edges does not need to be precise due to no waveguide structure, iii) There is no zero order and higher order diffraction that creates unwanted ghost beams. That is almost 100% conversion to the out put beam.
