We propose a novel scheme of high bit rate optical frequency
shift-keying transmitter. Base on the periodic notch spectral
properties of Mach-Zehnder delay interferometer and the carrier suppressing functionality of Mach-Zehnder modulator, a
high-speed optical FSK signal can be simply generated with another phase modulator and a single wavelength laser source.
The transmission characteristics of this FSK signal are investigated under varying dispersion management. Simulated
results show that 40Gb/s FSK signal gives only 1dB penalty after 80 km SMF transmission link under the
post-compensation management scheme.
In OBS network, one key factor is implementing a switching fabric to achieve low bursts loss rate as low as possible.
Another key factor in OBS network is scheduling bursts after switch fabric to an output port to achieve best utilizing
bandwidth. Until now the performance of switch fabric and scheduling algorithm is analyzed with a uniform assigned
traffic so called in this paper. The uniform assigned traffic is meant that the input traffic go to every output port with a
same probability of 1/N independently. Unfortunately, this uniform assigned traffic may not the most suitable way to
present the real world traffic. To deal with this problem, we present a new bursty assigned traffic model for analysis and
performance evaluation of OBS network. Like a legacy bursty traffic the bursty assigned traffic is divided to two cycle:
bursty cycle and nonbursty cycle. The input traffic is directed to an output port with a probability larger than 1/N in
bursty cycle and is directed to an output port with a probability less than 1/N or none in nonbursty cycle. Then making
use of the definition the bursts loss ratio of switch fabric and the LAUC-VF scheduling algorithm under uniform
assigned and bursty assigned traffic is presented and compared in the paper.
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