| Preface | 5 |
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| Contents | 7 |
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| Abbreviations | 13 |
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| 1 Introduction into Photonic Packaging | 20 |
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| Abstract | 20 |
| 1.1 Optical Transmission Systems | 20 |
| 1.2 System Applications of Optical Communications | 23 |
| 1.2.1 Optical Telecommunication Systems | 23 |
| 1.2.2 Optical Datacom Systems | 27 |
| 1.2.3 Optical Systems in Cars and In-house Areas | 30 |
| 1.3 Photonic Packaging and Interconnection Technology | 34 |
| References | 37 |
| 2 Optical Waveguides | 41 |
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| Abstract | 41 |
| 2.1 The Most Important Optical Laws | 41 |
| 2.1.1 Homogeneous Plane Wave | 42 |
| 2.1.2 Phase and Group Velocity | 44 |
| 2.1.3 Reflection | 44 |
| 2.1.4 Refraction | 45 |
| 2.1.5 Total Reflection | 46 |
| 2.1.6 Numerical Aperture | 47 |
| 2.2 Optical Fiber Profiles | 47 |
| 2.2.1 Step Profile | 49 |
| 2.2.2 Monomode Glass Fibers | 51 |
| 2.2.3 Gradient profile | 53 |
| 2.2.4 Phase-space Diagrams: ({{\bf sin}^{\bf 2} {\Theta} \,{\bi and}\,{\bi r}^{\bf 2} } ) | 54 |
| 2.3 Dispersion | 55 |
| 2.4 Attenuation | 56 |
| 2.5 Polymeric Fibers | 58 |
| 2.6 Optical Waveguides in InP, GaAs, PMMA, and SiO2 | 59 |
| 2.6.1 Geometry of Integrated Waveguides | 61 |
| 2.6.2 Semiconductor Laser | 62 |
| 2.6.3 PMMA-integrated Waveguides | 63 |
| 2.7 SiO2-Optical Waveguides | 65 |
| 2.8 Production of Optical Fibers | 66 |
| 2.9 Gas Phase Methods | 67 |
| 2.9.1 Drawing of Glass Fibers | 70 |
| 2.9.2 Types of Fiber-Optic Cables | 71 |
| References | 72 |
| 3 Optical Mode-field Adaptation | 74 |
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| Abstract | 74 |
| 3.1 Theory of Optical Mode-field Adaptation | 75 |
| 3.2 Definition of Field Radius | 75 |
| 3.3 Approximations to Determine the Mode-field Radius | 81 |
| 3.4 Loss Mechanisms in the Waveguide Coupling | 83 |
| 3.5 Coupling Efficiency in Case of Mode-field Mismatch | 84 |
| 3.6 Coupling Efficiency in the Presence of Longitudinal Displacement | 87 |
| 3.7 Coupling Efficiency in the Presence of Transverse Offset | 89 |
| 3.8 Coupling Efficiency in the Presence of Angular Misalignment | 90 |
| References | 92 |
| 4 Fiber-Optical Coupling | 94 |
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| Abstract | 94 |
| 4.1 Adjusting Techniques | 94 |
| 4.1.1 Active Techniques | 94 |
| 4.1.2 Passive Techniques | 95 |
| 4.2 Fixation Techniques | 97 |
| 4.3 Characteristics of a Good Coupling | 98 |
| 4.4 Reflections | 99 |
| 4.5 Mode Fields in Waveguide Structures (Spot Size) | 100 |
| 4.6 Coupling Efficiencies | 102 |
| 4.7 Laser--Fiber Coupling | 108 |
| 4.8 Waveguide Taper | 114 |
| 4.9 Mode-Field Measurement Methods | 114 |
| 4.9.1 Near-Field Method | 115 |
| 4.9.2 Median-Field Method | 117 |
| 4.9.2.1 Automated Acquisition | 120 |
| 4.9.2.2 Measurement Setup | 121 |
| 4.9.2.3 Results | 122 |
| 4.9.3 Far-Field Method | 124 |
| 4.10 Summary | 125 |
| References | 125 |
| 5 RF Lines | 127 |
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| Abstract | 127 |
| 5.1 Maxwell's Equations | 127 |
| 5.2 Wave Types | 129 |
| 5.3 Conduction Equations | 131 |
| 5.4 Skin Effect | 133 |
| 5.5 Coaxial Cables | 134 |
| 5.6 Wave Impedance | 136 |
| 5.7 Coplanar Lines | 136 |
| 5.8 Substrate Materials | 138 |
| 5.9 High-Frequency Connection of OEICs | 140 |
| 5.9.1 K-plug Connection | 141 |
| 5.9.2 RF Supply from the Plug to the OEIC | 142 |
| 5.10 Production of Coplanar Lines | 143 |
| 5.10.1 TMM Substrate | 143 |
| 5.10.2 Alumina Ceramic | 145 |
| 5.10.3 Silicon | 146 |
| References | 147 |
| 6 Soldering, Adhesive Bonding, and Bonding | 148 |
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| Abstract | 148 |
| 6.1 Die Bonding | 148 |
| 6.2 Heat Sinks | 149 |
| 6.3 Failure Mechanisms | 152 |
| 6.4 Reliability Tests | 153 |
| 6.5 Adhesive Bonding | 153 |
| 6.6 Wire Bonding | 154 |
| 6.7 Thermo-compression Bonding | 157 |
| 6.8 Ultrasonic Bonding | 159 |
| 6.9 Thermo-sonic Bonding | 160 |
| 6.10 Bonding Tools | 160 |
| References | 162 |
| 7 Optical Connection Technology | 163 |
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| Abstract | 163 |
| 7.1 Single-Fiber Connectors | 163 |
| 7.2 Multi-mode and Multi-fiber Connectors | 165 |
| 7.3 Examples of Optical Connectors | 166 |
| 7.4 Optical Fiber Tapers | 171 |
| 7.4.1 Manufacturing of Fiber Tapers | 171 |
| 7.4.2 Taper Measurement Setup | 173 |
| 7.4.3 Measurement of the Reference Light Source | 175 |
| 7.4.4 Measurement of the Reference Light Coupled to the Fiber | 176 |
| References | 179 |
| 8 Active Adjustment Techniques | 180 |
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| Abstract | 180 |
| 8.1 Micrometer Positioners | 180 |
| 8.1.1 Mechanical Positioners | 180 |
| 8.2 Laser Microwelding | 186 |
| 8.2.1 Laser Welding Methods | 186 |
| 8.3 Criteria for the Choice of Welding Methods | 187 |
| 8.4 Laser Material Processing | 188 |
| 8.5 Industrial Multi-point Laser Welding | 191 |
| 8.6 Laser Micro-welding for Modules with Tapered Fibers | 193 |
| 8.6.1 Coupling Concept | 193 |
| 8.6.2 Module Setup | 196 |
| 8.6.3 Flange Setup | 197 |
| 8.6.4 Welding Results | 198 |
| 8.6.5 Initial Welding Results | 199 |
| 8.6.6 Correction After Initial Welding | 202 |
| 8.6.7 Dynamical Shift | 204 |
| References | 205 |
| 9 Passive Adjustment Techniques | 206 |
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| Abstract | 206 |
| 9.1 Flip-Chip Technique | 206 |
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