All-Optical Parallel Encryption of QPSK Signals Based on Non-Degenerate Four Wave Mixing in HNLF for Physical Layer Security of Optical Network

A scheme for all-optical encryption/decryption of QPSK signals based on ND-FWM in HNLF is proposed. Theoretical analyses and simulations are conducted. The results are useful for designing optical encryption/decryption for complex modulated signals.