Understanding the basics of all optical switching
| Added: 04-06-2008 Author: Colin Yao Category: Communications |
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All-eyes light switching system, usually in the form of digital communication signals, the transmission is taken from one channel to another, or set, without intermediary conversion to other formats.
In the old technology, routing usually involves the following steps: detection signals from the eye, is an electronic routing decision, electronic triggering the laser output in the appropriate channel, and a new generation of Pulse eyes. In all formats the signal switching eyes fixed on his eye-domain and the property was changed so that the spread of a particular outcome.
All eyes-exchange now has two meanings. First, the function of electrically-controlled switching. For example, this can be controlled through electro-optic effect. Phase change when used interferometrically in changing 2x2. Switching between the two is better performed by ganging many 2x2 switch.
For the second exchange is all eyes, even when the control operation carried out optically. Namely, a combination block, rather than electrical signals, change the character of interferometric combination of leading and controlling the production. Using this method usually controlled intensity changes in refractive index.
However, if both types require a change in refractive index so that the device geometry and their applications are very similar. Electro-optic modulator, principlly system using ferroelectric materials have been used, in which eye development is still very Futuristic concepts and a lot depends on the continued development tools.
Alternative all-optical switching technologies
Nonlinear optics of choice has several elements that make it interesting, and perhaps the only feasible solution for increased data speeds in the terabit range and higher. All eyes and light-beam switching depending on the response of the third order nonlinear material properties, which may be short as femtoseconds.
How does it work?
Any combination of signals can be diagnosed and that the spatial location, while his arrival in a special area, phase, and discrimination. Optical, if a change in one of these properties could lead to future identification and rerouting Pulse.
Images from all combinations of switching devices are Mach-Zehnder interferometer, usually in guided wave structures.
A Mach-Zehnder interferometer has six different components, which together two input and output channels. Branch Y divides input signals into the same signal between two channels.
In the absence of light illumination sharp eyes, the two signals and distribute their differences and find identical channels the same changes in each phase. Therefore, in the second Y Junction, recombine the two signals in phase with the input signal is output appears ltered Channel.
If one party is to control the intensity of light and my light, and channel that has a non-linear behavior, if there is a change in the light of the regional index. Therefore, no additional changes in the phase of the signal beam in the hands of the distance brought light and sin to sign two more hands in the output stage in Junction Y. Reduce the damage caused disturbances transmitted signal. When they complete the phase change of the damage, full damage occurs to intervene and all the light scattered and absorbed and no light through the work of Y. Worn two modulations that all eyes.
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