Intensitymodulated labeling and all-optical label swapping on angle-modulated optical packets

Abstract—We proposed and investigated superimposing inten-sity-modulated labels onto high-speed angle-modulated payloads in optical label-switching packet networks. This can largely sim-plify the all-optical label swapping, including label extraction, pro-cessing, removal, and new label insertion. The transmission perfor-mances of 1.244-Gb/s ON–OFF keying labels on 9.953-Gb/s optical frequency-shift keying and differential phase-shift keying payloads were investigated; and the all-optical label swapping was success-fully demonstrated with low penalty. Index Terms—Differential phase-shift keying (DPSK), fre-quency-shift keying (FSK), optical label switching (OLS), optical packet networks. I