The random shift of the resonance wavelength due to the fabrication deviation is greatly reduced to be ~0.91 nm compared with that (~4.93 nm) of those regular microring resonators (on the same chip).

In light of this, we report on a multi-band photonic integrated $\mathbf {1\times 2}$ wavelength selective switch (WSS) operating in the O, S, C and L-bands. The photonic integrated WSS presented in ...