Depth Analysis Of The Working Principle Of All Optical Switch

By Author: Lili router
Total Articles: 4
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Among them, a typical example WS-C3560X-24T-S WS-C3560X-24T-S is all-optical switching devices. All-optical switch has simple optical mechanical device development from the original into a high-speed optical devices with new function. New features such as dynamic adjustable optical attenuation and optical layer multicast has been introduced to the optical switching devices. The characteristics of the next generation all-optical switches are better performance, more feature rich. Performance improvement will set up a broad platform for the new application of more. Ranging from new technology to new system integration.

Optical layer protection mechanism

Network protection mechanism of SDH / SONET using the mainstream transmission technology has become the industry standard is the fact. The new method of network protection is in the access networks tend to adopt double return (or unprotected) technology, using SDH / SONET self-healing ring in the metropolitan area network.

In long distance transmission network by 1 ∶ 1 and 1 ∶ ...
... N (main) linear protection technology. However, with the development of intelligent optical network, some of the urgent need for a variety of network topology structure (such as a ring network, interconnection ring network, mixed network, shape and ring lattice network) and new optical layer protection mechanism.

The design of these protective mechanisms should be exchange, multicast and attenuation control function together. For example, the ring network protection mechanism is currently the most popular is the two fiber unidirectional path switched ring (UPSR / 2) and two fiber bidirectional line switched ring (BLSR / 2). Recently they have been moved to the optical layer, such as the realization of optical channel dedicated path protection ring (OCh - DPRING, based on optical UPSR) and optical multiplex section shared protection ring (OMS - SPRING, based on optical BLSR) and optical layer protection mechanism.

Integrated optical switch that the ring network easier to expand mutual chain, mixed network, shape and ring lattice network. The fast all-optical switches with gain control and multicast function, can be virtual protection ring network is superimposed on the physical lattice online, the result is business recovery faster,.

Dynamic all-optical network

User demand for high bandwidth data business continued to grow, and the recent progress of optical communication technology has promoted the emergence of dynamic, intelligent optical network. Intelligent optical layer offers a variety of services, such as dynamic channel allocation, power control, protection of optical layer and optical burst switching.

Both the all-optical network based on photoelectric optical (OEO) network, introducing the new function of the DWDM optical network can realize the dynamic wavelength assignment. The control plane they can build on the network management system, GMPLS or sudden all-optical switches. However, their demands for the optical layer functions are similar.

Dynamic wavelength assignment requirements better adapt to changes in the physical layer. In OEO networks, wavelength terminated at each node. This limits the impact of light to every link through wavelength, allowing the implementation of simple equalization of optical power in each link (the output power of the transmitter).

Therefore, in the OEO network instant effect mainly affects the optical amplifier. For example, the new added between the nodes D and G wavelength, will cause the light signal input of the power amplifier 1 increase, so that the channel gain attenuation of 3dB. In the 2 and 3 optical amplifier optical power is reduced two times.

The received power node F significantly decreased. Therefore, it will trigger the alarm and protection switching service interruption. To avoid this problem, change with the input power amplifier should link and automatic gain control. The design requirements for integrated optical switch technology is very suitable for such a device.

Apparently the exchange rate is very important. Add a new wavelength can quickly provide can also slowly gradually provide. Fast operation can make the optical channel has remained stable in the protection switching is triggered before. The stable time required is almost a microsecond (associated with a specific application), it may not be possible for all-optical devices.

The corresponding power growth gradually new wavelength is relatively slow, effect on built channel is negligible; therefore the wavelength stable time also can relax. Defect is to establish a connection for a longer period of WS-C3560X-48T-L WS-C3560X-48T-L time and increase the complexity of the whole process.