Abstract: An integrated DWDM transmitter apparatus includes a silica-on-silicon substrate which includes a silica layer and a silicon layer. A plurality of input waveguides and a plurality of gratings are provided within the silica layer. Each of the plurality of gratings is coupled to a corresponding one of the input waveguides. An arrayed waveguide grating within the silica layer is coupled to the plurality of input waveguides, and at least an output waveguide within the silica layer are coupled to the arrayed waveguide grating. The transmitter also includes a plurality of lasers disposed in a recessed region of the silica-on-silicon substrate, and each of the lasers is optically coupled to a corresponding one of the plurality of input waveguides. The integrated transmitter also includes plurality of photodiodes, each of the plurality of photodiodes overlying a corresponding one of the plurality of grating.

Abstract: System to determine an optimal detection point associated with an incoming data stream. The data stream has an associated eye pattern that contains a data value for each of a plurality of threshold points defined by a plurality of amplitude rows and a plurality of phase columns. The system includes a method that includes the steps of determining an amplitude opening value for each of the phase columns, determining a phase opening value for each of the amplitude rows, determining a selected phase opening from the phase opening values and a selected amplitude opening from the amplitude opening values, and determining the optimal detection point from the selected phase opening and the selected amplitude opening.