According to a historical rule of thumb, which is widely used in routers, the buffer size of each output link of a router should be set to the product of the bandwidth and the average round-trip time. However, it is very difficult to satisfy this buffer requirement for ultra-high-speed dense wavelength division multiplexing (DWDM) networks with the current technology. Recently, many researchers...

Dense Wavelength Division Multiplexing (DWDM) is the system with more than eight active wavelengths per fiber. Again high data rates as well as long spans between amplifiers in a chain require high optical power per channel to satisfy the signal to noise ratio (SNR) requirements. So the DWDM systems with long repeater-less spans, the simultaneous requirements of high launched power and low disp...

We describe some of our recent results on DWDM mm-wave radio-on-fiber (RoF) technology for future broadband wireless systems. A supercontinuum (SC) light source is a promising multiwavelength light source for the system with photonic up-conversion. Multiplexing and demultiplexing schemes for optical frequency interleaving in order to extend the number of antenna base stations can be constructed...

Failure of even a single fiber link in DWDM mesh networks can cause severe data and revenue loss due to failure of several lightpaths of high bandwidth. This paper investigates this problem using shared path protection technique. First, we propose a link disjoint path finding heuristic, Multiple Active Path Search (MAPS) and show that it works even under trap topologies where conventional algor...

In this paper the transmission performance of 32 × 10 Gbps with 0.8 nm channel spacing dense wavelength division multiplexed system using hybrid optical amplifiers (RAMAN-EDFA, RAMAN-SOA AND EDFA-SOA) has been investigated. The performance has been compared at different distances and has been evaluated on the basis of Quality factor, optical output power, bit error rate and average eye opening....

Various binary and non-binary modulation techniques, in conjunction with appropriate detection techniques, are compared in terms of their spectral efficiencies and signal-to-noise ratio requirements, assuming amplified spontaneous emission is the dominant noise source. These include (a) pulse-amplitude modulation with direct detection, (b) differential phase-shift keying with interferometric de...

The demands for greater spectral efficiency, higher line rate, higher channel count, greater amplifier/repeater spacing, Tb/s capacity DWDM long haul optical communication systems, efficient transmission of optical channels over long-haul optical fibre system is essential. Since the conventional Return to zero (RZ) and Non return to zero (NRZ) modulation formats suffer from dispersion and ineff...