Page 698 - Introduction to Information Optics

68: 12. Networking with Optics

AJ A 2 A 3 A 4

Fig. 12.8. Architecture of an eight-channel DWDM demultiplexer using dielectric thin-film filters.

12.2.3.4. Array Waveguide Grating
The array waveguide grating (AWG) is an optical integrated circuits
technology fabricated usually on planar silicon substrates. Its operation is
illustrated in Fig. 12.10. It consists of two star couplers connected by an array
of waveguides that act like a grating. Within the waveguide array there is a
constant length difference from one waveguide to the next. Because of this
design, the transmission amplitude T pq from the pth input port to the <yth