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Fujitsu optical switch based on MEMS mirrors

Posted: 02 Oct 2003 ?? ?Print Version ?Bookmark and Share

Keywords:fujitsu laboratories? fujitsu? optical switch? mems mirror? micro electro-mechanical system mirror?

Fujitsu Laboratories Ltd and Fujitsu Ltd have announced the development of an 80-channel optical communications switch that adopts MEMS (micro electro-mechanical system) mirrors. Claimed by the company as the fastest multi-channel optical switch to date, the device achieves a switching speed of 1ms.

The company's development depends on MEMS mirrors to bounce light beams. The MEMS mirrors can be tilted to deflect the beam to different points in space, resulting, in this case, in a 3D optical MEMS-mirror switch.

A notch filter in the MEMS mirror serves to suppress the mechanical resonance that normally occurs when switching the optical signal. The notch filter eliminates just the MEMS mirror's resonant frequency from the driving electrical waveform to enable faster switching times.

A folded optical switch fabric configuration was developed whereby the input beam is reflected through a roof-type retro-reflector on its way to the output. Compared to flat mirrors, this configuration halves the length of the optical path, making for a more compact switch overall.

The tilt of the MEMS mirrors is precisely controlled through a feedback loop in a built-in control function, which maintains the optical power at a fixed level. This makes it possible to compensate for variations in the power levels of each channel and also eliminates the need to have variable optical attenuators external to the switch.

Measuring 150-by-400-by-300mm, the switch offers an optical power stability within 0.5dB.

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