Optical switch and control method therefor

An optical switch comprising:

• a first spectral unit;
• a second spectral unit for further spectrally diffracting a plurality of wavelength components spectrally diffracted in the first spectral unit;
• a plurality of movable mirrors capable of reflecting the plurality of wavelength components spectrally diffracted in the second spectral unit respectively and directing the same in different directions;
• and
• a controller for controlling so that, before or after switching an output port by controlling a reflecting face of at least one movable mirror among the plurality of movable mirrors, an inclination of the reflecting face is different for a first axis but an inclination of the reflecting face is the same for a second axis perpendicular to the first axis.

An optical switch comprising:

• a first spectral unit;
• a second spectral unit for further spectrally diffracting a plurality of wavelength components spectrally diffracted in the first spectral unit;
• a plurality of movable mirrors capable of reflecting the plurality of wavelength components spectrally diffracted in the second spectral unit respectively and directing the same in different directions;
• and
• a controller for setting so that a reflecting face of at least one movable mirror among the plurality of movable mirrors is inclined in an initial state.

A method for controlling an optical switch, the optical switch is constituted so that a plurality of light input/output units arranged in parallel, spectral units, a light focusing unit and movable reflectors are arranged in this order while being optically coupled via reflections by the movable reflectors, and path switching is performed on lights which are input from the light input/output unit for each wavelength component to be output to the light input/output unit, where the spectral unit spectrally diffracts a light input from the light input/output unit into a wavelength component light having an angle different for each wavelength through diffraction, the light focusing unit aligns in an optical axis and focuses each wavelength component light spectrally diffracted in the spectral unit, and the movable reflector reflects each wavelength component light from the light focusing unit and sets a first reflecting angle for performing path switching of each wavelength component light while sets a second reflecting angle for correcting a deviation of a reflecting light locus in the movable reflector caused by a deviation of an optical axis of each wavelength component light from the light focusing unit, and the optical switch comprising a controller for performing path switching of each wavelength component light and controlling the movable reflector in order to correct a deviation of an optical axis for each wavelength component light from the light focusing unit, wherein

• the controller previously stores initial setting control information for setting the second reflecting angle as an initial setting value of each wavelength component, and performs initial setting of the second reflecting angle of the movable reflector based on the stored initial setting control information on initiating the optical switch.