The ever-increasing bandwidth requirement and accommodation of the transmission of large volume of data are stimulating the research of finding a high-speed optical transmission network solution. High-speed optical transmission can provide the most reliable and cost-effective solution to this emerging necessity. The rapid growth of traffic over optical network makes the necessity of 100 Gb/s optical network backbone mandatory.
1 Gb/s Ethernet is common in Local Area Network nowadays. It can serve individual user’s workstation data needs perfectly. This bandwidth will remain sufficient for single user’s need for next few decades. However, the scenario in data centers and servers are different; Cisco, one of the pioneers in networking device manufacturers, estimates the expansion of data traffic in global datacenters over the next five years-with the current yearly growth rate of about 30%, the data ...view middle of the document...
Another recent development in computing, which consumes a huge resource of datacenters is the cloud computing technology. This technology uses datacenter computers and servers for synchronized, coherent operation and consumes large data traffic and resources in order to perform the computing task. Another factor that is contributing the increased data center traffic is the change in data patterns in the data centers due to virtualization. The transmission of huge data traffic to and from data centers are now supported mostly by 10 Gb/s and 40 Gb/s optical network which would become exhausted within next few years. So it is time to find a better and faster optical network solution.
The internal transmission cost is greatly reduced by fastest and high capacity optical transmission technology. The cost per bit in transmission in 100 Gb/s optical network is almost catching up that of 10 Gb/s network and would cross it over within few years with improvement in design and technology. This cost-effectiveness also suggest recent backbone should be replaced by a cheaper and faster transmission method.
The IEEE standard 802.3ba was assigned for the 40 GB/s and 100 GB/s technology in the year 2007. The purpose was to extend the 802.3 protocol to an operating speed of 40 GB/s and 100 GB/s which can be able to accommodate the high bandwidth demand while maintaining the backward compatibility with the existing network.
However, achieving 100 Gigabyte per second speed is not easy. Apart from the challenges associated with signaling of this high rate of data transmission network, there are several obstacles and technical difficulties associated with the hardware and infrastructure in switching from slower speed to faster speed of data transmission.
Scaling bandwidth without changing method of operation, optimizing the modulation techniques, provision for future expansion, backward compatibility are the few problems that has to be addressed in achieving high-speed capacity using current infrastructure.
Transmission of optical data at a speed beyond 10 Gb/s presents multiple signal degradation problems including chromatic dispersion, polarization-mode dispersion, attenuation.