Patent ID: 7405858

Claim:
An acousto-optic tunable filter (AOTF) control apparatus that applies a radio frequency (RF) signal to an acousto-optic tunable filter (AOTF) to allow a selected light included in a wavelength-division multiplexing (WDM) transmission signal to pass through the AOTF to be dropped from the WDM transmission signal, comprising: a first calculating unit that calculates a relationship between a frequency of the RF signal and a wavelength of the selected light based on a frequency of the RF signal that allows a reference light of a predetermined wavelength to pass through the AOTF; and a second calculating unit that calculates a relationship between a power of the RF signal and an attenuation amount of the selected light based on an input power of the reference signal at the input of the AOTF and an output power of the reference signal at the output of the AOTF.