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Asymmetrical rib waveguide bends on silicon-on-insulator were applied to the design of a compact integrated 39 × 39 star coupler. With bend radius of 500 μm, the effective chip size of the coupler is nearly 1 cm2. The average excess loss as low as 1.3 dB was achieved at wavelength 1.55 μm. This bend configuration is not single-mode, but by appropriate design, the fundamental mode propagation can be achieved. It can be used in arrayed waveguide grating devices based on SOI.
Date of Publication: Dec. 2005