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This report presents an optical surge light suppressor based on MEMS technology. The device aims to preclude the downing of sensitive optical receivers located downward by blocking the signal path, monitoring the power surge caused either intentionally or unintentionally. The device consists of MEMS-based shutter and photovoltaic cell, and activates the shutter through the voltage created by a part of surge light canalized into the cell, thus makes a complete passive operation possible. The insertion loss being around 1.5dB, the device shuts the line at the input light power level of 10dBm with a delay of 3ms, and when the surge subsides, it automatically restores the signal line. The return loss is around 40dB, and the trigger power level is tunable through various optical design configurations.
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