Phase Retrieval in Short-Reach Optical Links: KK and GS
Description
Photodetectors in optical communication systems measure only field intensity, the phase is lost. Phase retrieval methods aim to recover the full complex field from intensity-only measurements, avoiding the need for a local oscillator laser. This assignment covers two such approaches: the Kramers–Kronig (KK) receiver, which uses a single detector with a specially prepared transmit signal, and the Gerchberg–Saxton (GS) algorithm with a dispersive element, which requires two intensity measurements.
The student's task is to understand the working principles of both methods and summarize them in a report.
Possible literature
- Recent Advances in Coherent Optical Communications for Short-Reach: Phase Retrieval Methods, Karar et al. Photonics 2023
- Gerchberg–Saxton Algorithm Based Phase Correction in Optical Wireless Communication, Li et al. Phyiscal Comm 2017
Prerequisites
Lecture: Optical Communication Systems