Monolithic Flexible-Grid 1 $\,\times\,$2 Wavelength-Selective Switch in Silicon Photonics

We describe in further detail a demonstration of a monolithic 1$\,\times\,$2 silicon wavelength-selective switch in silicon photonics. The switching has a flexible grid with 32 pixels on a pitch of 100 GHz. It is extremely compact, being only 3.0$\,\times\,$ 5.5 mm$^2$ , and it can potentially be mass-produced by a silicon foundry. It requires improvements in many characteristics, though, most notably insertion loss, resolution, and pixel count.