The 1550nm Fiber Coupled Frequency shifter from CSRayzer is a Acousto-Optic Frequency Shifter with Optical Wavelength 1520 to 2000 nm, Optical Power 500 mW, Frequency Shift 35 to 300 MHz, RF Power 2.5 W. More details for 1550nm Fiber Coupled Frequency shifter can be seen below.