| 摘要 |
<p>The invention is generally directed to integrated optical devices, such as switches and variable optical attenuators. A solid-state actuation mechanism (e.g., heat) is used to switch, attenuate, and/or trim the devices. The devices have a known state in the case of electrical power failure. Some disclosed designs direct optical signals out an output port of the device in the absence of power, while the other designs direct optical signals out a separate exhaust port in the absence of power. <IMAGE> <IMAGE></p> |
