The 1550nm Fiber-coupled Acousto-optic Modulator/Frequency Shifter AOFS from BeamQ Lasers is a Acousto-Optic Frequency Shifter with Optical Wavelength 1550 nm, Optical Power 1 W (Average), Frequency Shift ±80 MHz, Acoustic Velocity 4200 m/s(Sound), RF Power 2.5 W. More details for 1550nm Fiber-coupled Acousto-optic Modulator/Frequency Shifter AOFS can be seen below.