Abstract:

This paper describes new technologies that will be used in 40 Gbit/s，100 Gbit/s and higher rates ultra-high speed optical communication，including phase modulation，quadrature amplitude modulation，multi-level modulation and other new modulation techniques such as polarization multiplexing and orthogonal frequency division multiplexing，also coherent receiver technology principles，the advantages and application necessity，photonic integration technology and evolution. The end of this paper introduces the applications about these new technologies in ultra-high speed optical communication such as 400 Gbit/s/1 Tbit/s. This article also describes the research progress of fiberhome in ultra-high speed optical communication，including research results of 100 Gbit/s ethernet and 1 Tbit/s coherent optical orthogonal frequency division multiplexing（CO-OFDM）1 040 km error-free ordinary single-mode fiber transmission .

Key words: phase modulation, quadrature smplitude modulation, multi-level modulation, polarization multiplexing, orthogonal frequency division multiplexing, coherent reception, photonic integrated circuit