An integrated 1.times.K wavelength-selective cross connect (WSC) comprises
a demultiplexer arranged to couple each of the N individual wavelength in
an input optical WDM signal to a different one of N demultiplexer outputs.
Each of N planar beam steerers, arranged along the left edge of a free
space region, receives and directs a different one of the N light beams
from the demultiplexer to a location on the right edge of the free space
region. Each of K gratings arranged along a different location on the
right edge of the free space region multiplexes together any light beam
received at that location. The 1.times.K WSC can be implemented with or
without the use of crossovers.
