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To Ensure That Third by jojo
Network operators, today is exciting and challenging times: the impact of ubiquitous broadband, increasing the network expected to be transformed; use of broadband services more and more people, network traffic growth; as voice and video on the jitter and delay-sensitive triple play services continue to increase, the characteristics of network traffic is also changing.
To meet these requirements, the network must be strengthened deal with "on demand" type burst traffic capacity, such as video on demand, video conferencing (such business on the bandwidth and response time are demanding, require the highest service level).
Monitoring function, can maximize network performance.
However, simply by "adding bandwidth" is unable to meet these challenges. The reason is bandwidth prices by the first of the dramatic impact of network competition, continued to decline since 2001; Second, the operating expenditure (opex) of total costs accounted for 70% to 80%. Therefore, the network operator only significantly increase the rate at the same time significantly reducing opex, to profit.
To ensure the viability of the business, network operators need to conduct detailed analysis, manpower and network and resources must be optimized in order to achieve maximum network efficiency and timely response and maintain growth. In the light transmission level, reconfigurable OADM (ROADM) is more than the fixed wavelength OADM can increase network capacity and to promote the highest network efficiency.
WSS ROADM module also has a dynamic gain equalizer and optical properties
Total cost of the network Traditional fixed wavelength of the fixed-wavelength filter OADM wavelength Road, also will not need to be under the direct wavelength path.
Build or reconstruct a network of fixed-wavelength OADM may take several weeks, because the experts have to slowly move around and between the precise manual work, including the configuration of each node, analysis, and balanced light power, tuning
Laser Etc.. In most cases, such manual adjustment requires repeated. Obviously, the process is cost-intensive but also limited the speed of the network business. Moreover, there may interrupt the running of business.
In addition, the fixed-wavelength OADM lack of flexibility has also led to the problem of low network bandwidth utilization. Fixed-wavelength OADM, the operators in the early stage of network construction business to make some predictions, and when business traffic is not expected direction according to time, such an assumption may eventually lead to the network system has been abandoned. Moreover, because the fixed wavelength OADM can only book groups up and down the wavelength path can not allocate bandwidth wavelength granularity, therefore, may lead to lack of bandwidth when there are some wavelength idle situation.
View of the above reasons, the global network operators are beginning to realize the value of ROADM. Recently reported that 65% of the network operators are planning in their
MAN Application of ROADM. ROADM is 65% of the average annual growth rate (
CA GR) development. 1 ROADM wavelength and straight up and down road does not require optical wavelength conversion, support any connection between the port does not need to re-design the network structure. ROADM optical layer level to provide flexibility, similar to the ADM in
SONET / SDH Provide sub-wavelength level of flexibility.
ROADM is suitable for the current network. By reducing opex, increase network operators the ability to operate and speed, ROADM reduce overall network costs, and bring to the network the following features:
Optical layer automatic, simple, quick business.
Flexible network configuration, time to adapt to changes in demand.
Avoid idle bandwidth is scarce and the wavelength at the same time, the existing situation and improve bandwidth utilization.
Integrate SONET / SDH and WDM Layer, simplifying the network. ROADM can also enhance the service provider network and private network
Figure also shows the ROADM can support both Ethernet and SONET
ROADM structure In before deciding ROADM network operators should be careful of the various ROADM and comparison. ROADM type generally in accordance with its filtering and switching functions are divided into: discrete device type, the wavelength block-type, using an integrated planar optical waveguide (
IP LC) of the wavelength block-type, and wavelength switching.
ROADM technology is based on the early separation of the optical mechanical switch, filters and various optical attenuator (VOA). As the most technology have been commercialized, so it is easy to implement. However, this approach uses optical components is very large, leading to high insertion loss, high cost, size large?? Hindered its wide application.
Block-type wavelength DWDM ROADM will be splitting the input signal power is divided into two parts under the road and straight. Its core?? Wavelength blocking device, the DWDM demultiplexer, VOA and multiplexer form, usually by the micro-electromechanical systems (MEMS) or liquid crystal to achieve.
Although this structure reduces the number of discrete devices, but also forced the network operators to purchase one-time purchase multiple wavelengths. In addition, most of this structure is not flexible use of fixed wavelength filters for wavelength, the lower road, unable to reconstruct the upper and lower road wavelength, can only be reconstructed through the wavelength. Therefore, this structure can only be called "semi-reconfigurable" OADM.
Block device to another wavelength using IPLC. This "block device and the IPLC" of the structure will block the wavelength multiplexer device and the road was integrated, thus eliminating the need for a separate road multiplexer, but the cost of additional light switch. In addition, the wavelength of this structure in the road is fixed, while saving a tunable laser, but can not be dynamic wavelength allocation.
IPLC-based program because of its characteristic limitations, can not support two-way applications, and this is the basic requirement for building ring.
The present, the best third-generation ROADM ROADM systems. This system is based on multi-port wavelength switch (WSS) (see Figure 1), truly the ROADM of "reconfigurable" so that network operators can be run on the network requirements and timely response. Wavelength switch can be in any DW
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Article Source: http://www.earticlesonline.com/Article/To-Ensure-That-Third/875479
