AO Modulator/ Frequency Shifter (1550nm)High extinction ratio, high stability, low insertion loss By effectively combining precision fiber coupling packaging technology and spatial acousto-optic modulation technology, while using unique crystal low-temperature bonding technology, and continuously optimizing the matching of optical path and acoustic field, this high-reliability and high-performance product has been developed. This product has the advantages of compact structure, high stability, low insertion loss, high extinction ratio, etc. It can be perfectly integrated into the all-fiber optical path system, accurately modulate the intensity of the fiber laser, and effectively achieve the wavelength frequency shift of the laser. This series of fiber-coupled acousto-optic modulators for applications in the fields of fiberoptic sensing, optical communications, and quantum technology, etc.