Projects : transmission

High Speed Digital Transmission

In the next generation of long-haul fiber-optic communication systems, it is envisioned that a single wavelength (lambda) will support 100 Gb/s transmission rates via migration to advanced modulation and detection formats that will increase both spectral efficiency and optical impairment tolerance. At the core of the NEC OND innovation and technology leadership in this area are resilient, spectrally-efficient techniques, including polarization multiplexing of multi-level constellations combined with digital coherent detection, enabled by sophisticated electronic digital signal processing (DSP). Our recent experimental achievements in this area include the world-record 32 Tb/s (320x114 Gb/s) fiber-optic transmission over 580 km via POLMUX-RZ-8QAM and digital coherent detection, which has set a new milestone for bandwidth capacity delivered over a single optical fiber (please see link for details.). We are also investigating advanced electronic (DSP)-based forward error correction (FEC), nonlinearity compensation and equalization mechanisms for high-speed fiber-optic transmission.