IdealPhotonics' fiber optic phase modulator is an optical signal control device based on electro-optic/acousto-optic effects. It achieves dynamic 0-2π carrier phase modulation (GHz-level bandwidth, Vπ < 3V) through lithium niobate (LiNbO₃) waveguides or fiber stretching mechanisms, providing a crucial means of optical field manipulation for systems such as coherent communication and quantum key distribution."GHz-level agile phase control" utilizes lithium niobate (LiNbO₃) electro-optic waveguides (Vπ ≤ 2V) or fiber loop piezoelectric actuation (resolution 0.01 rad) to achieve ultrafast (response < 1 ns) and highly linear (nonlinear distortion < -50 dBc) modulation of the optical carrier phase, providing a foundation for precise optical field control in quantum state preparation and ultra-high-speed coherent optical communication.