| http://www.w3.org/ns/prov#value | - The apparatus of claim 2 having a center propagation constant denoted as ??c, a grating order ??L??c /(2??) wherein ??L is a constant, and wherein the lengths of respective waveguides is substantially calculated from ##EQU13## wherein g(m) represents an arbitrary function, and round represents a function that rounds the value of its argument to an integer.
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