Transparent optical protection switching scheme based on detection of polarisation fluctuations

We have demonstrated a novel transparent optical protection-switching scheme capable of switching with minimum, and even without, loss of data. The detection circuit has proven to trigger the optical switch when failure situations, like the unplugging of a fibre-connector or the fibre being exposed to abnormal environmental conditions, occurs. We believe this protection scheme will be attractive for networks where optical transparency or high level of protection security, like protection against security attacks, tampering or earthquakes, are desired.