This paper describes the photonics technologies that make it possible to support exploding traffic demand in next generation broadband networks combining telecom and broadcast arena. Technology trends of high capacity transmission and network node are summarized including some Japanese government funded projects, together with access technologies and some emerging device technologies that support the system requirements.
Technical possibilities to increase the capacity and distance in long-haul transmission systems are summarized and discussed. Based on the current status of commercial available performance and its extension, trends and trade-offs of capacity and distance are summarized with the consideration of OSNR. The dependence on repeater spacing and spectral efficiency is also summarized and discussed. Limiting factor of increasing capacity-distance products are described from the viewpoint of higher spectral efficiency and broader optical bandwidth. Several limiting factors such as OSNR, nonlinearities, dispersion and PMD are discussed with the candidates of solving technologies.
We propose an optical PSK modulation scheme achieved by direct modulation of a laser diode with a wide flat FM response. We call it Direct-Modulation PSK (DM-PSK). We performed 4-Gb/s DM-PSK and CP-FSK transmission experiments at 135 un over 233 km of conventional 13-. un zero-dispersion fiber. The receiver sensitivity degradation due to chromatic dispersion was 0. 7 dB for DM-PSK smaller than that of 2. 5 dB for CP-FSK.
Conference Committee Involvement (4)
Optical Transmission Systems and Equipment for Networking VI
11 September 2007 | Boston, MA, United States
Optical Transmission Systems and Equipment for Networking V
2 October 2006 | Boston, Massachusetts, United States
Network Architecture, Management, and Applications IV
5 September 2006 | Gwangju, South Korea
Optical Transmission Systems and Equipment for WDM Networking II
8 September 2003 | Orlando, Florida, United States