Double-phased array for a flattened spectral response

We successfully demonstrate a new InP-based double phased-array waveguide (PHASAR) exhibiting a flattened spectral response in use as a WDM wavelength demultiplexer. Bandwidth is 0.94nm at -1dB and 1.8nm at -20 dB. Loss penalty due to channel flattening is only 2.2dB.