In order to introduce optical fibers in the last one mile to the home, the realization of low cost photonic circuit is crucial. We propose a new concept of phtonic circuit consisting of stacked multi-layers of diffractive opticalemenets. Wafer-scale alignment is expected to reduce fabrication cost of each photonic circuit. The first prototype demonstrationof the photonic circuit is reviewed. The experimental results required further insertion loss improvement. To fulfill this need, we developed an optical CAD environment specifically targeted on telecommunication applicaitons. The detail of the CAD environment as well as the second prototype experimental results are discussed.
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