Wavelength Selective 1x4 Switch for 128 WDM Channels at 50 GHz Spacing

We present a reconfigurable wavelength-selective switch that independently distributes 128 input WDM channels to four output ports. The switch is based on bulk optics and MEMS micro-mirrors, exhibits 5 dB insertion loss and flat-top pass-bands, and is well suited for transparent switching of 10 Gb/s signals.