Optical label switching by using DPSK and in-band sub-carrier multiplexing modulation format

Optical label switching based on combined differential phase shift keying (DPSK) modulation and subcarrier multiplexing is experimentally demonstrated at 10 Gbit/s DPSK encoded payload and 100 Mbit/s amplitude modulated subcarrier-multiplexed labeling. This scheme is spectral efficient and robust to fiber dispersion