Optical Fiber Telecommunications VII
Chapter 9: High-order modulation formats, constellation design, and digital signal processing for high-speed transmission systems
Tianhua Xu, Gabriele Liga and Polina Bayvel
ISBN: 978-0-12-816502-7

Coherent Optics for Access Networks
Chapter 6: Simplified Coherent Optics for Passive Optical Networks
Domanic Lavery and Mustafa Sezer Erkilinc

Optical Communication Systems: Limits and Possibilities
Chapter: Spatial multiplexing: Modelling
Filipe M Ferreira 
ISBN: 9789814800280