The content of this book is divided into 10 chapters. Chapter 1 introduces the importance， classification and parameter of optical switch， and points out the research direction of the all-optical switch; Chapter 2 gives the basic knowledge of nonlinear optical physics and materials for all- optical switches; Chapter 3 introduces the electricity-controUed optical switches， which are available in the market; Chapter 4 studies the optical bistable device (OBD) including the pure optical OBD and the electro-optical hybrid OBD， in addition the instability of OBD; Chapter 5 discusses the nonlinear interferometer all-optical switches as a kind of space-type AOSs; Chapter 6 introduces the nonlinear fiber grating AOS， which is one of intensity-type AOSs; Chapter 7 shows the nanoscale AOS including the nanoscale waveguide AOS， the photon crystal AOS and the surface plasmonic AOS; Chapter 8 discusses the optical flip- flop， a time-type AOS， and the wavelength convertor， a wavelength-type AOS; Chapter 9 talks about optical-limiting optical switches， which is a transmittance switch used for preventing laser injure to eyes. Finally， Chapter 10 discusses the applications of AOSs in all-optical communication networks.

Preface
Chapter 1Introduction to Optical Switch
1.1 Importance of Optical Switch
1. 1.1Optical Switch is a Demand of-Optical Physics Development
1. 1.2Optical Switch is a Demand of Photonic Technology Progress
1.2Classification of Optical Switch
1.2.1Classification According to the Control Method
1.2.2Classification According to the Working Function
1.2.3Classification According to theWorking Domain
1.3Parameters of Optical Switch
1.3.1Performance Parameters of Optical Switch
1.3.2 Figure of Merit of Optical-Switch Materials
1.4Research Direction of All-Optical Switch
1.4.1 Technical Indicators of Applicable AOS
1.4.2 Difficulties and Solutions of AOS Study
References
Chapter 2Nonlinear Optical Basics for All-Optical Switch
2.1K-K Relation and Kerr Effect
2.1.1Kramers-Kronig Relation
2.1.2 Relation Between △n(ω) and △α(ω)
2.1.3Optical Kerr Effect and Optical Phase Modulation
2.2Two-Photon-Absorption Effect
2.2.1Optical Intensity Transportation Equation
2.2.2 TPA Coefficient Measurement
2.2.3 TPA in Silicon Material
2.3Optical Nonlinearity in Semiconductor
2.3.1Free-Carrier Nonlinearity
2.3.2 Bound-Electron Nonlinearity
2.3.3 Quantum-Confinement Nonlinearity in Semiconductor
2.4Optical Nonlinearity in Glass Materials
2.4.1Silica and Doped Silica
2.4.2 Chalcogenide Glass
2.5Nonlinear Optical Mechanism in Organic Material
2.5.1 Conjugated Polymers
2.5.2Charge Transfer Molecules (Chromophores)
2.5.3 Miscellaneous Molecules
2.6Saturable and Reverse Saturable Absorption
2.6.1Saturable Absorption
2.6.2 Reverse Saturable Absorption
References
Chapter 3Electric-Controlled Optical Switches
3.1Electro-Optical Switches
3.1.1 Electro-Optic Coupler Optical Switches
3.1，2Electro-Optic M-Z Interferometer Optical Switches
3.1.3 Branch-Waveguide Electro-Optical Switches
3.2Waveguide Thermo-Optic Switches
3.2.1Coupler Thermo-Optic Switches
3.2.2M-Z Interferometer Thermo-Optic Switches
3.2.3Multi-Mode Interference Thermo-Op.tic Switches
3.2.4Branch-Waveguide Thermo-Optic Switches
3.2.5Ring-Resonator Thermo-Optic Wavelength Switch
3.2.6Phase Transition Thermo-Optic Switch
3.3Liquid Crystal Optical Switch
3.3.1Birefringent-Type Liquid Crystal Optical Switch
3.3.2Polarization-Type Liquid Crystal Optical Switch
3.3.3Reflection-Type Liquid Crystal Optical Switch
3.4Mechanical Optical Switches
3.4.1Simple Mechanical Optical Switches
3.4.2MEMS Optical Switches
3.5Magneto-Optical Switches
3.6Acousto-0Ptieal Switches
3.6.1 Beam Reflection-Type Acousto-Opfical Switches
3.6.2 Polarization Conversion Acousto-optical Switches
References
Chapter 4Optical Bistability Devices
4.1Introduction to Optical Bistability
4.1.1 Optical Bistability
4.1.2 Optical Bistable Devices
4.2Intrinsic Optical Bitable Device
……
Chapter 5Nonlinear-Interferometer All-Optical Switches
Chapter 6Nonlinear-Fiber-Grating All-Optical Switches
Chapter 7Nanophotonic All-Optical Switches
Chapter 8Optical Flip-Flop and Wavelength Converter
Chapter 9Optical-Limiting All-Optical Switches
Chapter 10AOS Application in All-Optical Network

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