The disclosure is directed to delivering power to and communication with optical devices, such as sensors and effectors using only optical fibers. The device may receive optical energy from a fiber optic cable simultaneously with receiving communication in the form of inverse signaling. Inverse signaling means the light is on for longer than the light is off which may allow the device may receive more optical energy than when using normal signaling. Normal signaling means the light is off for longer than the light is on. The device may perform sensing or other functions using the received optical energy. The device may send communications through at least one optical fiber that may be separate from the one or more optical fibers from which the device receives communication and optical energy. The device may send communication using normal signaling, which uses less energy than inverse signaling.