Silicon photonic O-band (de)multiplexers with flat-passband

Based on cascaded Mach-Zehnder lattice filter, an eight-channel silicon photonic (de-)multiplexer with flat passband is demonstrated in the O-band. The insertion loss of the device is -0.55~-2.48dB and the channel crosstalk is below -7dB. The FSR and channel spacing are about 36nm and 4.4nm respectively.