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.