In Chapter 9, Gonzalez et al. discuss both numerically and experimentally the dynamics of diode lasers coupled to each other with a long (relative to the internal dynamics) time delay. In the low-noise regime, two very similar lasers will alternate output pulses. But with the same noise source injected into both, they will synchronize and pulse simultaneously. Chapter 10 by Amann describes the behavior of complex networks based on coupled two-mode lasers, i.e., lasers that operate at two distinct wavelengths. The basic idea of building a complex network using lasers is discussed first, followed by an analysis of a Fabry-Perot–type cavity designed to lase at two wavelengths. Other than Chapter 4, this is the only chapter that discusses the optical modes of cavities. Rate equations are then used to model the coupled dynamics. The resulting phase diagram and time traces display a wide range of types of bifurcation including torus, period doubling, saddle node, Hopf, and saddle node limit cycle.