Optical Coherent Detection - QPSK example

Coherent detection in optical communications has become the means of achieving the highest spectral efficiency and the highest capacity in optical fiber. This high-level introduction covers the generic topics (applicable to wireless and optical) as well as the specifics of the optical implementation. This introduction of optical coherent detection includes
• Motivation
• Overview
• QPSK example from RF
• QPSK spectral behavior
• Implementation in optics
• Mathematics describing detection
• Polarization multiplexing, e.g., DP-QPSK
The lectures are from a laboratory course on Coherent Optical Communications.