| http://www.w3.org/ns/prov#value | - As stated previously, the essence of the coupling unit 110 is, generally speaking, that the input signal is used to modulate the refractive index and eventually also the gain or absorption characteristics of the modulation section 120. [0026] Turning now to FIGS. 3(a) through 3(g), there is shown various embodiments of the invention, particularly with respect to implementation of delay interferenc
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