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Table of Contents
Supervisor's Foreword; Abstract; List of Publications; Acknowledgments; Contents; Acronyms; 1 Preamble; References; 2 Introduction to Semiconductor Optical Amplifiers (SOAs); 2.1 Basics of SOAs; 2.1.1 Semiconductor Gain Media; 2.1.2 Theory of Semiconductor-Light Interaction; 2.2 Parameters of Optical Amplifiers; 2.2.1 Gain; 2.2.2 Gain Saturation
Saturation Power; 2.2.3 Gain Bandwidth; 2.2.4 Polarization Dependent Gain; 2.2.5 Noise Figure; 2.3 Dynamics of Conventional and QD SOAs; 2.3.1 About Slow and Fast Amplifiers; 2.3.2 Semiconductor Optical Amplifiers; 2.4 Summary; References
3 Samples and Characterization3.1 Epitaxial Structure, Processing and Post-processing; 3.1.1 Epitaxial Structure; 3.1.2 Processing; 3.1.3 Design and Post-processing; 3.2 SOA Coupling Stage; 3.3 QD SOA Sample Series; 3.3.1 Overview; 3.3.2 Sample Series; 3.4 Comparison to Commercial O-Band Amplifiers; 3.5 Static Properties; 3.5.1 Gain Saturation and Sectioned SOAs; 3.5.2 Wavelength Dependence of the Polarized Emission; 3.6 Gain and Phase Dynamics; 3.6.1 QD GS Dynamics Under GS Perturbation; 3.6.2 QD GS Dynamics Under ES Perturbation; 3.6.3 QD ES Dynamics Under GS Perturbation; 3.7 Summary
6 Signal Amplification6.1 On-Off Keying (OOK) Signals; 6.2 Differential (Quadrature) Phase-Shift Keying (D(Q)PSK) Signals; 6.2.1 Basic D(Q)PSK Setup and Device Under Test; 6.2.2 Single-Channel (D(Q)PSK) Amplification
IPRD; 6.2.3 DQPSK Amplification with One OOK Neighboring Channel; 6.3 Summary; References; 7 Concept of Dual-Band Amplifiers; 7.1 Concept of a Dual-Band QD SOA; 7.2 Measurements; 7.2.1 Setup; 7.2.2 Device Under Test, ASE and Gain; 7.2.3 40 GBd OOK Signal Amplification; 7.3 Simulation; 7.3.1 Model Description; 7.3.2 ASE and Gain; 7.3.3 40 GBd OOK Signal Amplification
7.4 SummaryReferences; 8 Signal Processing
Wavelength Conversion; 8.1 Wavelength Conversion in SOAs; 8.2 Introduction to Four-Wave Mixing (FWM); 8.2.1 Fundamentals of FWM in Semiconductors; 8.2.2 FWM Parameter Definition; 8.2.3 Wide-Range FWM Via Second Pump Signal; 8.3 Optimization of Static FWM; 8.3.1 Detuning Dependence; 8.3.2 Input Power Level Dependence; 8.3.3 Dependence of Spectral Position Relative to ASE Peak; 8.3.4 QD SOA Length Dependence; 8.3.5 Detuning Dependence for Dual-Pump Configuration; 8.3.6 Conclusion; 8.4 Wavelength Conversion of Phase-Coded Signals
Saturation Power; 2.2.3 Gain Bandwidth; 2.2.4 Polarization Dependent Gain; 2.2.5 Noise Figure; 2.3 Dynamics of Conventional and QD SOAs; 2.3.1 About Slow and Fast Amplifiers; 2.3.2 Semiconductor Optical Amplifiers; 2.4 Summary; References
3 Samples and Characterization3.1 Epitaxial Structure, Processing and Post-processing; 3.1.1 Epitaxial Structure; 3.1.2 Processing; 3.1.3 Design and Post-processing; 3.2 SOA Coupling Stage; 3.3 QD SOA Sample Series; 3.3.1 Overview; 3.3.2 Sample Series; 3.4 Comparison to Commercial O-Band Amplifiers; 3.5 Static Properties; 3.5.1 Gain Saturation and Sectioned SOAs; 3.5.2 Wavelength Dependence of the Polarized Emission; 3.6 Gain and Phase Dynamics; 3.6.1 QD GS Dynamics Under GS Perturbation; 3.6.2 QD GS Dynamics Under ES Perturbation; 3.6.3 QD ES Dynamics Under GS Perturbation; 3.7 Summary
6 Signal Amplification6.1 On-Off Keying (OOK) Signals; 6.2 Differential (Quadrature) Phase-Shift Keying (D(Q)PSK) Signals; 6.2.1 Basic D(Q)PSK Setup and Device Under Test; 6.2.2 Single-Channel (D(Q)PSK) Amplification
IPRD; 6.2.3 DQPSK Amplification with One OOK Neighboring Channel; 6.3 Summary; References; 7 Concept of Dual-Band Amplifiers; 7.1 Concept of a Dual-Band QD SOA; 7.2 Measurements; 7.2.1 Setup; 7.2.2 Device Under Test, ASE and Gain; 7.2.3 40 GBd OOK Signal Amplification; 7.3 Simulation; 7.3.1 Model Description; 7.3.2 ASE and Gain; 7.3.3 40 GBd OOK Signal Amplification
7.4 SummaryReferences; 8 Signal Processing
Wavelength Conversion; 8.1 Wavelength Conversion in SOAs; 8.2 Introduction to Four-Wave Mixing (FWM); 8.2.1 Fundamentals of FWM in Semiconductors; 8.2.2 FWM Parameter Definition; 8.2.3 Wide-Range FWM Via Second Pump Signal; 8.3 Optimization of Static FWM; 8.3.1 Detuning Dependence; 8.3.2 Input Power Level Dependence; 8.3.3 Dependence of Spectral Position Relative to ASE Peak; 8.3.4 QD SOA Length Dependence; 8.3.5 Detuning Dependence for Dual-Pump Configuration; 8.3.6 Conclusion; 8.4 Wavelength Conversion of Phase-Coded Signals