COMMUNICATION METHOD, COMMUNICATION APPARATUS AND COMMUNICATION SYSTEM
A communication method executed by a communication device includes a step of detecting a distortion of a wavefront of an arriving light signal, a step of deriving each of components from a higher-order component to a lower-order component in the distortion of the wavefront, a step of controlling an inclination of a reflection surface of a first optical device that changes a propagation direction of the light signal that has arrived, according to the lower-order component, and a step of controlling a phase modulation operation using a second optical device that modulates a phase of the wavefront of the light signal of which the propagation direction has been changed, according to the higher-order component
1 . A communication method executed by a communication device, the communication method comprising:
detecting a distortion of a wavefront of a light signal;
deriving each of components from a higher-order component to a lower-order component in the distortion of the wavefront;
controlling an inclination of a reflection surface of a first optical device that changes a propagation direction of the light signal, according to the lower-order component; and
controlling a phase modulation operation using a second optical device that modulates a phase of the wavefront of the light signal of which the propagation direction has been changed, according to the higher-order component.
2 . The communication method according to claim 1 , wherein
the first optical device is at least one of a tip-tilt mirror and a deformable mirror, and
the second optical device is a spatial light phase modulator.
3 . The communication method according to claim 1 , wherein
controlling according to the lower-order component includes selecting, with respect to the lower-order component, a Zernike mode in which a component amount in Zernike polynomials is equal to or larger than a first component amount, and controlling the inclination of the reflection surface according to the Zernike mode selected with respect to the lower-order component, and
controlling according to the higher-order component includes selecting, with respect to the higher-order component, a Zernike mode in which a component amount in the Zernike polynomials is equal to or larger than a second component amount, and controlling the phase modulation operation according to the Zernike mode selected with respect to the higher-order component.
4 . The communication method according to claim 1 , wherein
the light signal is a signal arriving at the communication device or a signal transmitted from the communication device.
5 . A communication device comprising:
a sensor that detects a distortion of a wavefront of a light signal;
an analyzer that derives each of components from a higher-order component to a lower-order component in the distortion of the wavefront;
a first controller that controls an inclination of a reflection surface of a first optical device that changes a propagation direction of the light signal, according to the lower-order component; and
a second controller that controls a phase modulation operation using a second optical device that modulates a phase of the wavefront of the light signal of which the propagation direction has been changed, according to the higher-order component.
6 . A communication system comprising:
a first communication device; and
a second communication device, wherein
the first communication device includes
a transmitter that transmits a light signal, and
the second communication device includes
a sensor that detects a distortion of a wavefront of a light signal arriving from the first communication device,
an analyzer that derives each of components from a higher-order component to a lower-order component in the distortion of the wavefront,
a first controller that controls an inclination of a reflection surface of a first optical device that changes a propagation direction of the light signal that has arrived, according to the lower-order component, and
a second controller that controls a phase modulation operation using a second optical device that modulates a phase of the wavefront of the light signal of which the propagation direction has been changed, according to the higher-order component.
7 . A communication system comprising:
a first communication device; and
a second communication device, wherein
the first communication device includes
a transmitter that transmits a light signal;
a sensor that detects a distortion of a wavefront of a reference light signal transmitted from the second communication device,
an analyzer that derives each of components from a higher-order component to a lower-order component in the distortion of the wavefront,
a first controller that controls an inclination of a reflection surface of a first optical device that changes a propagation direction of the transmitted light signal, according to the lower-order component, and
a second controller that controls a phase modulation operation using a second optical device that modulates a phase of the wavefront of the light signal of which the propagation direction has been changed, according to the higher-order component, and
the second communication device includes
a receiver that receives the light signal of which the phase has been modulated.