Patent ID: 6973228

Claim:
A wavelength stabilizing apparatus used in an optical module for controlling a light wave output from a tunable optical element comprising: a coarse-tuning module comprising: a first beam-splitting element receiving and dividing the light wave into a plurality of light waves; a first optical filtering element receiving at least one of the plurality of light waves and filtering off part channels of the light waves; and two photo-detecting elements transforming the light waves into a first electrical signal and a second electrical signal, respectively; a fine-tuning module comprising: a beam-splitting element dividing a received light wave into a plurality of light waves; a Fabry-Perot Etalon separating light waves having specific wavelength out of the plurality of light waves from the beam-splitting element; and two photo-detecting elements receiving the light waves having specific wavelength and transforming them into a third electrical signal and a fourth electrical signal, respectively; and a servo element receiving the first, second, third, and fourth electrical signals to perform a signal processing; wherein the servo element performs coarse-tuning and channel recognition of the light wave output from the tunable optical element on the basis of a voltage value relating to the first and second electrical signals, and performs fine-tuning and servo control of the light wave output from the tunable optical element with an error signal being a voltage value relating to the third and fourth electrical signals.