| http://www.w3.org/ns/prov#value | - FIG. 17A is a schematic drawing of a further alternative embodiment of the invention allowing the implementation of a full 4-port add/drop device through the use of a two-position ???W??? mirror array at the spectral image plane, with no additional circulators or cascaded gratings required, with the W-mirror shown in the express position; and
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