Posts tagged ‘adva optical networking’

Architecting Efficiency into 100G Transport #cable

Today’s metro environment is one of the most demanding in the entire network

Service providers and enterprises are continually being challenged to transport more data while at the same time reduce costs. After all, it is in the metro that optical networking’s most critical, bandwidth-intensive applications – residential broadband, business Ethernet, mobile backhaul and data-center connectivity – all converge.

There Is No One Size Fits All

100G technology has been elected to address the challenge of transporting enormous amounts of data and add scalability to optical networks. Clearly, 100G has rapidly matured. The time between early hero experiments and commercial product realization has been remarkably short. One factor accelerating the 100G development cycle has been early consensus across the industry on how 100G should be tackled. The OIF’s recommendation of DP-QPSK modulation for long haul systems allowed the component industry to focus its efforts into one direction. In addition, the IEEE released standards for client interfaces up to 40km, including a four-lane approach with 25G per serial channel.

No standards group, however, seemed to pay much attention to the metro segment, which comprises distances between 25km and 500km. 100G coherent solutions have great spectral efficiency, but they score very poorly in terms of space and power consumption, especially when compared to the 10x10G channels they seek to replace. This is not a temporary design flaw of early implementations but rather inherent to the technology itself. Coherent receiver technology is complex, including a lot of signal processing, which consumes significant amounts of power and generates a lot of heat.

Secondly, the cost aspect: 100G coherent solutions are certainly well on their way to move downward on the cost curve – but so are existing 10G solutions. As always, the industry is aiming at a moving target. While volumes for 100G coherent technology are going up helping to drive the cost curve down, the gap to 10x10G solutions will remain significant for quite some time.

Driving New 100G-Efficiencies

These drivers illuminated the market opportunity for lower-cost, direct detection 100G designs for the metro, and, indeed, solutions have quickly emerged. Direct detection 100G solutions are cost competitive with established 10x10G systems from day one. ADVA Optical Networking’s efficient 100G Metro solution is the most effective way to simply transport data traffic in metro and enterprise applications today. It is fully integrated into the FSP 3000 platform and utilizes four DWDM wavelengths with 28Gbit/s capacity per wavelength to support data transmission over distances up to 500km. Its state-of-the-art design offers powerful forward error correction options supporting effective link design.

Figure 1 illustrates how the FSP 3000 100G Metro solution optimizes 100G transmission over typical metro and 100G Metro reach without inline amplicationregional network distances. Lowest cost-per-bit transmission is achieved through deployment of non-coherent direct detection. Without the use of inline amplification or passive dispersion compensation, 125km error-free performance is achieved. Without passive dispersion compensation, network operators can utilize lower cost and single-stage EDFA amplification at the terminal end points. When applying dual-stage Raman/EDFA amplifiers, the achievable single-span reach is extended to 200km, enough reach for most metro application.

Efficiency Comes as Standard

10G metro muxponderOptical networking is not a one-size-fits-all, commodity technology space. ADVA Optical Networking’s 100G Metro is the most effective way to simply transport data in metro and enterprise applications. Its compact design provides industry-leading space efficiency, its low power consumption and minimum heat dissipation saves operational cost and its ultra-low latency design makes it ideal for high-frequency trading applications. 100G Metro: The lowest costper-bit 100G transport available today.

Figure 2 shows ADVA Optical Networking’s implementation of a 100G Metro multiplex-transponder for the FSP 3000 scalable optical transport solution. While enabling maximum 100G efficiency over metro distances, a complementary coherent 100G implementation provides scalability also for long distances.

Michael Ritter, ADVA Optical Networking

ADVA optical networking

Cable Congress eBook: Packet Optical Networking

Packet Optical Networking

The core of the network is the workhorse that must handle the enormous amounts of data that are consumed by video, cloud computing and other popular bandwidth-intensive Web 2.0 applications. Yet, most core networks are still too inefficient and limited in bandwidth. Network operators need to rapidly adapt and increase network capacity. They also need to reduce their cost of deploying, operating and scaling optical core networks in order to keep margins strong. With the demand to shorten time-to-revenue and reduce operational expenses, increased network flexibility and lower operational complexity have become important areas of focus for cable operators. Next-generation architectures need to be defined which can cope with these challenges.

A new crucial milestone in optical networking has been reached with the evolution of Dense Wavelength Division Multiplexing (DWDM) technology to support a more flexible and dynamic agile optical core network infrastructure. DWDM networks are now evolving from a virtual fiber infrastructure into a true service provisioning solution.

The speed of data transported over a single wavelength has reached 100Gbit/s and will further scale. At the same time, new modulation schemes provide enhanced optical performance and reach. In combination with a new generation of optical components and devices, this technology simplifies network planning and therefore increases operational efficiency.

Next-generation Reconfigurable Add/Drop Multiplexer (ROADM) technology offers more dynamic and flexible options in operating optical networks. With this technology, new services can be provisioned without performing complex network engineering tasks. The additional integration of OTN and packet switching functionality has seen DWDM technology finally evolve into an intelligent and agile transport solution. The integration of packet-based forwarding and Ethernet service capabilities in particular contribute to the agility of optical transport technology, making multi-layer packet optical technology the ideal choice for innovative network infrastructures.

Figure 1 Multi-layer network architecture

Control Plane for Optical Transport Networks

An intelligent control plane starts to play an important role with the evolution of optical networks to a more flexible and dynamic multilayer service provisioning solution. A control plane offers a number of benefits. Control plane enabled agile optical networks support new, dynamic services including bandwidth-on-demand applications and customer-initiated service requests. The control plane also improves network efficiency and resiliency when applied for dynamic service restoration. Finally, the control plane helps to reduce operating expenses by simplifying service turn-up and network maintenance.


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