In this book chapter, the performance parameters deteriorate significantly with the increasing number of output waveguides (transmitting channels) and therefore it was necessary to develop new AWG design procedures.

Chapter Contents:

• 10.1 Arrayed waveguide gratings
• 10.1.1 AWG principle
• 10.1.2 Different types of AWGs
• 10.1.2.1 Low-index contrast AWGs
• 10.1.2.2 High-index contrast AWGs
• 10.2 AWG design
• 10.2.1 Focusing
• 10.2.2 Dispersion
• 10.2.3 Free spectral range
• 10.2.4 Performance parameters
• 10.2.4.1 Insertion loss
• 10.2.4.2 Insertion loss uniformity (non-uniformity)
• 10.2.4.3 Channel crosstalk
• 10.2.5 AWG design parameters
• 10.3 AWGs for telecom applications
• 10.3.1 SoS-based 8-channel, 100-GHz AWG
• 10.3.1.1 Design
• 10.3.1.2 Simulation
• 10.3.1.3 Evaluation of simulated results
• 10.3.1.4 Fabrication
• 10.3.1.5 Design verification
• 10.3.2 SoS-based 64-channel, 50-GHz AWG
• 10.4 AWGs for spectroscopic applications
• 10.4.1 Optical coherence tomography
• 10.4.2 AWG-spectrometer for SD-OCT system
• 10.4.2.1 Determining minimum separation between PA waveguides
• 10.4.2.2 Determining minimum separation between output waveguides
• 10.4.2.3 Optimizing channel crosstalk in high-channel-count AWGs
• 10.4.2.4 256-channel, 42-GHz AWG-spectrometer for SD-OCT
• 10.5 Conclusion
• Acknowledgements
• References

Inspec keywords: optical waveguides; arrayed waveguide gratings; diffraction gratings

Other keywords: performance parameters; spectroscopic applications; arrayed waveguide gratings; AWG design procedures; telecom; output waveguides; transmitting channels

Subjects: Optical waveguides and couplers; Optical waveguides; Gratings, echelles