Technical features of a new generation of intelligent optical networks

The new generation of intelligent optical network as a future transmission network development direction has been recognized by the industry. As a Ciena company with a history of more than 10 years, there are many unique research results and leading technologies in this field. They have more mature ideas in the composition and technology of the new generation of intelligent optical networks. ——— Editor

1. Single-Machine integrated multiple SDH devices the next generation of intelligent Optical Network is composed of DWDM optical switch, its core layer device is optical switch. Optical network based on optical switch, a device completes several equipment function, the network is simple, the maintenance is convenient. Traditional SDH networks have many ADM and DWDM connections because a single device cannot complete all of its functions.

2. Dynamic bandwidth allocation and bandwidth tuning large-capacity optical switching based on small granularity and grooming: the characteristic of intelligent Optical Network is that the exchange granularity is small, and has the function of dredging, these two features provide the foundation for the Intelligent Optical network to realize arbitrary cascade, virtual capacity, fictitious ring protection and mesh recovery. The large capacity of the optical switch is shown in the exchange matrix of hundreds of trillion, the device 10Gbps interface reaches dozens of, and can be extended to many tbps.

Dynamic bandwidth allocation and tuning: The next generation of intelligent Optical Network has two interfaces is very important, one is the user-network interface, the other is network-network interface. User-network interface is mainly routers and other access devices and optical network interface between the network-network interface to complete the intelligent optical Network circuit configuration.

The flow distribution of IP network is uneven, and the dynamic change, QoS is difficult to guarantee, the use of intelligent Optical network can dynamically allocate bandwidth, and pass on the network interface, adjust the distribution of network bandwidth, play a role in helping IP network to solve the QoS.

3. Point-to-Point circuit recovery Ciena new generation of Intelligent Optical Network lightwork solution is:

(1) The user is divided into different grades, user priority can be used to protect the bandwidth of communication, high priority users can occupy the lower priority of the user's bandwidth at any time.

(2) The network element uses the distributed intelligence to realize the point-to-point restoration to the circuit, although the recovery time is longer than the ring protection, but does not have the very big influence to the IP network, does not need the artificial recovery to complete the network circuit all restores.

4. Mesh Network (mesh) and virtual switched ring mesh networks are the main networking modes of a new generation of intelligent optical networks, which are flexible and extensible, and close to the network characteristics of data networks. Mesh network protection is diverse, in addition to linear protection, ring exchange and protection mainly using virtual exchange ring.

Virtual Switch ring is the software can define the ring exchange and protection, because the virtual Exchange loop is implemented by software, not limited by the physical capacity and configuration, so the virtual switching loop can support the full capacity of the circuit to reach the loop.

5. The distributed intelligence of signaling and routing protocol and distributed network Intelligent Optical Network relies entirely on optical routing and Signaling Protocol to replace the traditional intelligent network management, distributed Intelligent Network topology discovery and automatic circuit configuration are the main embodiment of distributed intelligence. Unlike IP routing, optical routing is not routing and forwarding packets, it mainly plays the role of circuit configuration, when the circuit is formed, only the path management and control.

6. Virtual capacity virtual capacity makes the application of optical Network service out of the changes and features of the physical platform, the virtual capacity expands the concept of virtual memory to optical network, the virtual capacity allows optical network services to use all available capacity in any span, regardless of the actual transmission capacity. Bandwidth is a shared pool, which can be optimized for distribution to optical service, and mainly used in intelligent optical network.