Active devices

Fully-routed two-way multiplexer with heaters

Fig. 4 Silicon photonics Mach-Zehnder modulator (source:

In photonics, active devices are devices that require a source of energy to be operated and that output a signal as a function of present and past input signals. Examples of active devices are photodetectors, modulators, switches, amplifiers, tunable filters and lasers. These devices are among the main building blocks of photonics integrated circuits.