A terminal (100) for optical communication by laser signals including a matrix image sensor used as a tracking and acquisition detector (2). The matrix image sensor is used simultaneously to check that a portion of the laser signals received by the terminal are injected into an optical fibre (1). A spectral filter element (22) is associated with the matrix image sensor to allow such a combination of functions.

A terminal (100) for optical communication by laser signals including a matrix image sensor used as a tracking and acquisition detector (2). The matrix image sensor is used simultaneously to check that a portion of the laser signals received by the terminal are injected into an optical fibre (1). A spectral filter element (22) is associated with the matrix image sensor to allow such a combination of functions.

A laser safety system adapted to prevent inadvertent illumination of people and assets. The laser safety system configured to emit a laser beam with a laser and determine a path of a target object relative to the laser safety system. The laser safety system configured to cause the laser beam to illuminate the target object while the target object moves along the path.

A communication system has a plurality of LEO satellites in a specified orbital plane and a plurality of trunk satellites in a medium earth orbit. Each LEO satellite acquires satellite-specific data and includes inter-satellite links with adjacent LEO satellites. Each trunk satellite includes inter-satellite links adjacent trunk satellites. One of the trunk satellites operates as a relay trunk satellite in position to maintain optical communication with a specified ground station on the Earth. Each LEO satellite has a limited field of regard to establish optical communication with any trunk satellite. A relay LEO satellite is configured to establish optical communication with a corresponding trunk satellite. The plurality of LEO satellites relay aggregated data to the relay LEO satellite. The relay LEO satellite relays the aggregated data to the corresponding trunk satellite. The relay trunk satellite relays the received aggregated data to the corresponding ground station.

A communication system has a plurality of LEO satellites in a specified orbital plane and a plurality of trunk satellites in a medium earth orbit. Each LEO satellite acquires satellite-specific data and includes inter-satellite links with adjacent LEO satellites. Each trunk satellite includes inter-satellite links adjacent trunk satellites. One of the trunk satellites operates as a relay trunk satellite in position to maintain optical communication with a specified ground station on the Earth. Each LEO satellite has a limited field of regard to establish optical communication with any trunk satellite. A relay LEO satellite is configured to establish optical communication with a corresponding trunk satellite. The plurality of LEO satellites relay aggregated data to the relay LEO satellite. The relay LEO satellite relays the aggregated data to the corresponding trunk satellite. The relay trunk satellite relays the received aggregated data to the corresponding ground station.

A switching instructor outputs a beacon light selection notification signal when a optical transceiver transmits a optical wireless signal of a beacon light and outputs a signal light selection notification signal when the optical transceiver transmits the optical wireless signal of the signal light. A spatial light modulator controller performs switching of a control signal given to each of the plurality of pixels of a spatial light modulator to: cause a phase delay in light received by each of the plurality of pixels of the spatial light modulator when the switching instructor outputs the beacon light selection notification signal and cause a phase delay in light received by each of the plurality of pixels of the spatial light modulator when the switching instructor outputs the signal light selection notification signal.

The technology employs a state-based power control loop (PCL) architecture to maintain tracking and communication signal-to-noise ratios at suitable levels for optimal tracking performance and data throughput in a free-space optical communication system. Power for a link is adjustable to stay within a functional range of receiving sensors in order to provide continuous service to users. This avoids oversaturation and possible damage to the equipment. The approach can include decreasing or increasing the power to counteract a surge or drop while maintaining a near constant received power at a remote communication device. The system may receive power adjustment feedback from another communication terminal and perform state-based power control according to the received feedback. This can include re-initializing and reacquiring a link with the other communication terminal automatically after loss of power, without human intervention. There may be a default state and discrete states including rain, fade, surge and unstable states.

The present disclosure aims to enable communication to be performed with stable quality even when a user uses a terminal while moving. In the wireless communication system according to the present disclose, a switching control unit 15 sets switching illuminance p.sub.th for maintaining illuminance of an optical signal received by a terminal 91 at requested illuminance corresponding to throughput or higher during the time until connection switching between the communication with an optical wireless access point 92 and the communication with an RF wireless access point 93 is completed, and when the received illuminance p becomes lower than the switching illuminance p.sub.th during connection with the optical wireless access point 92, the switching control unit 15 performs connection switching from the optical wireless communication to the RF wireless communication.

The present disclosure aims to enable communication to be performed with stable quality even when a user uses a terminal while moving. In the wireless communication system according to the present disclose, a switching control unit 15 sets switching illuminance p.sub.th for maintaining illuminance of an optical signal received by a terminal 91 at requested illuminance corresponding to throughput or higher during the time until connection switching between the communication with an optical wireless access point 92 and the communication with an RF wireless access point 93 is completed, and when the received illuminance p becomes lower than the switching illuminance p.sub.th during connection with the optical wireless access point 92, the switching control unit 15 performs connection switching from the optical wireless communication to the RF wireless communication.

A system and method for high speed communication are provided. The system comprises a laser-based system for communication, the system comprising: an acquisition module configured to acquire and characterize a plurality of laser beams; a tracking module configured to track the acquired laser beams, the tracking module comprising: a beaconing feedback and beam divergence mechanism configured to control a beam and detect a beam; an adaptive learning unit configured to implement an adaptive learning detection algorithm to identify and track a unique optical signature from at least one of the acquired laser beams; and a pointing module configured to point at least one laser beam towards a target based on the acquired laser beams.