Semiconductor Optical Amplifiers with Bragg Gratings
Nonlinear periodic structures can be made using a variety of materials including fibers and semiconductors. Fiber Bragg gratings are the subject of much research and, indeed, are the focus of several chapters in this book. In this chapter, we consider a Bragg grating fabricated within a semiconductor optical amplifier (SOA). The strong carrier-induced nonlinearity and the resulting nonlinear shift of the Bragg resonances are discussed in Sect. 13.2. The origin and characteristics of bistable switching, a common nonlinear response that occurs at powers as low as 1 μW, are discussed in Sect. 13.3. Section 13.4 is devoted to a simple theoretical model for investigating the nonlinear response of Bragg-grating SOAs. In Sect.13.5, we consider Bragg-grating SOAs in the context of a broader class of devices referred to as resonant-type SOAs. In Sect. 13.6, potential applications in the domain of fiber-optic communication systems are discussed, emphasizing the features of all-optical switching and memory.
KeywordsFiber Bragg Grating Photonic Bandgap Carrier Lifetime Hysteresis Curve Optical Bistability
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