MEMS optical switch promises next-gen networks

 

Multimirror MEMS device can switch up to 80 channels

A prototype multichannel optical switch with a speed of 1 ms promises to provide the fast optical cross-connect required for the development of all-optical communication networks.

With package dimensions of only 150 x 400 x 300 mm, a prototype 80-channel optical communications switch from telecommunications manufacturer Fujitsu (Tokyo, Japan) has a switching speed of 1 ms�the fastest of any multichannel switch available. By eliminating the need to convert light into electricity during the switching process, the 3-D optical MEMS device is expected to enable the development of the optical cross-connect systems essential for next-generation optical transmission networks.

The switching speed is achieved by using a notch filter to eliminate mechanical resonance by removing the resonant frequency of the comb-driven MEMS mirrors from the driving electrical waveform. In addition, a feedback loop with a built-in control function compensates for variations in the power levels of each channel, eliminating the need for external variable optical attenuators and providing an optical power stability of ±0.5 dB.

The device uses a folded-optical-switch configuration in which the input beam is reflected though an angled retro-reflector that halves the optical path and reduces device size. Using a comb-shaped electrode structure to drive the MEMS mirrors results in greater driving power than with a planar structure.

The device is currently being evaluated for the best manner to bring the technology to market. A variety of platforms within the company's product line are expected to contain the device.

A prototype MEMS optical switch promises to allow the creation of next-generation fiber networks

Nombre: Lenny D. Ramirez C.
Asignatura: CRF
Dirección: http://www2.electronicproducts.com/MEMS_optical_switch_promises_next-gen_networks-article-olap-jan2004-html.aspx
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