A research group led by Professor Masataka Nakazawa at the Research Institute of Electrical Communication, Tohoku University, has achieved the first Wavelength Division Multiplexing (WDM) optical transmission at 320 Gbit/s/channel by employing time-domain optical Fourier transformation, a technology designed to eliminate waveform distortion. This group has realized a world record transmission that is 30 times faster than traditional WDM transmission.

 The research group has achieved 1.6 Tbit/s-525km transmission at five wavelengths by Optical Time Division Multiplexing (OTDM) thus increasing the transmission speed to 320 Gbit/s per wavelength. It is noteworthy that the highly stable long-haul transmission of ultrahigh-speed optical signals has been realized at 320 Gbit/s by applying the time-domain optical Fourier transformation method to Differential Phase Shift Keying (DPSK). This technology shortens the wavelength to one-tenth and increases the transmission speed to 30 times its traditional value.

 The research results were presented at the European Conference on Optical Communication (ECOC2009) in September 2009.

[Contact]
Professor Masataka Nakazawa
Associate Professor Toshihiko Hirooka
Department of Ultrahigh-Speed Optical Communication, Research Institute of Electrical Communication, Tohoku University
Address: 2-1-1 Katahira Aoba-ku, Sendai, Miyagi, 980-0811, Japan
Tel: +81-22-217-5525
Fax: +81-22-217-5524