Compact and low crosstalk echelle grating demultiplexer on silicon-on-insulator technology

We report on the design of an ultra-compact integrated wavelength demultiplexer in echelle configuration for the optical O-band realized on silicon-on-insulator technology. The device has four channels with channel spacing of 800 GHz and a small footprint of 260 &times
83 &mu
m2. Channel crosstalk lower than &minus
28 dB across the four channels is experimentally demonstrated along with insertion losses of &minus
1.5 dB.