Optical phase modulators are key components in optical communication, sensing, and signal processing systems. All-optical modulators, which modulate the phase or intensity of a light signal by a control light beam, have attracted much research interest. The phase of the signal beam is controlled by the control light beam rather than an electronical signal, which avoids electro-optical conversion in the optical link and makes it possible to break through the “electronic bottleneck” in principle.
Click here for original story, Broadband low-loss all-optical phase modulator using gas-filled hollow-core fiber
Source: Phys.org