A transceiver comprises a transmitter including a light source, a modulator coupled to the light source, a driver that drives the modulator according to a set of driving conditions to cause the modulator to output optical signals based on light from the light source, and an output that passes first portions of the optical signals output by the modulator. The transceiver further comprises a first detector that detects second portions of the optical signals output from the modulator, and a receiver including a second detector that detects optical signals from an external transmitter.

A radio communication system for duplex communication comprising an optical carrier generator for generating optical carrier signals, a local oscillator (LO) for generating an electrical signal in a radio communication band, an information signal source, electro-optic modulators driven directly at an input electrical port by said information signal and said LO signal to modulate a portion of said optical carrier signal to form a modulated portion being an optical band information signal for transmission over an optical link; and a photodetector remote from said electro-optic modulators for receiving said transmitted optical band information signal from said optical link, and directly generating an electrical signal that is up-converted for radio transmission, or down-converted to a baseband frequency.

A communication system for transport means is provided, by which wireless communication is performed between the outside and the wireless communication environment in the transport means. Optical wireless communication is performed between a terminal device 2 and a light source device 3. A body ECU 4 connected to the light source device 3 by wired connection is further connected, by the wired connection, to a DCM 7 performing wireless communication with the outside. The light source device 3 and the body ECU 4 communicate with each other by power line communication. Accordingly, the light source device 3 sends and receives information between the outside via the body ECU 4 and the DCM 7. Thus, a vehicle communication system 1 that realizes wireless communication between the outside and the in-vehicle wireless communication environment (in-vehicle wireless communication environment configured including the terminal device 2 and the light source device 3) is built.

A communication device includes an interleaving unit that determines an interleaving length of transmit data to be transmitted through free-space optical communication, and interleaves the transmit data based on the determined interleaving length, and a shaping unit that shapes the interleaved transmit data so as to make the interleaving length detectable on a receiving side of the free-space optical communication.

An underwater communications system may include a first device and a second device being movable relative to one another. The first device may include a first laser transmitter configured to generate a first laser beam having a selectable spatiotemporal beam shape from among a plurality thereof, and a first controller coupled to the first laser transmitter and configured to select a spatiotemporal beam shape for the first laser beam from among the spatiotemporal beam shapes. The second device may include a second laser receiver configured to receive the first laser beam, and a second controller coupled to the second laser receiver.

An optical wireless communication system (1) for wirelessly transmitting a signal beam (L) between optical communication units (2) and (3) located at two points apart from each other includes an aiming mechanism (4) that is provided in each of the optical communication units (2) and (3) located at the two points and has an aiming line (S), which is parallel to an optical axis (O) and has a predetermined interval from the optical axis (O), with the optical axis (O) of the signal beam (L) of each of the optical communication units (2) and (3) located at the two points aligned in a straight line, and a first front sight that is provided in each of the optical communication units (2) and (3) and provided at a position that is off the optical axis (O) and the aiming line (S) and has a predetermined interval from the optical axis (O) and a predetermined interval from the aiming line (S).

Systems and methods for performing operations based on LIDAR communications are described. An example device may include one or more processors and a memory coupled to the one or more processors. The memory includes instructions that, when executed by the one or more processors, cause the device to receive data associated with a modulated optical signal emitted by a transmitter of a first LIDAR device and received by a receiver of a second LIDAR device coupled to a vehicle and the device, generate a rendering of an environment of the vehicle based on information from one or more LIDAR devices coupled to the vehicle, and update the rendering based on the received data. Updating the rendering includes updating an object rendering of an object in the environment of the vehicle. The instructions further cause the device to provide the updated rendering for display on a display coupled to the vehicle.

An optical transceiver apparatus and an optical signal processing method. The optical transceiver apparatus may include a light source, an optical signal processor, and an optical path selector. The light source is separately connected to the optical signal processor and the optical path selector, and the optical signal processor is connected to the optical path selector. The light source is configured to provide a first local oscillator optical signal and a first carrier optical signal. The optical signal processor is configured to modulate the first carrier optical signal and output a first modulated optical signal. The optical path selector is configured to transmit the first local oscillator optical signal and the first modulated optical signal to the optical signal processor or a transmission fiber. Herein, the transmission fiber is configured to transmit an optical signal to an outside of the optical transceiver apparatus.

Systems and methods for optical path protection for distributed antenna systems are provided. In one embodiment, a system comprises a hub and at least one node located remotely from the hub. The hub is coupled to the node by first and second fiber paths, the first fiber path comprising an uplink fiber and a downlink fiber, the second fiber path comprising an uplink fiber and a downlink fiber. The node is coupled to the downlink fibers of the first and second fiber paths via an optical combiner, and is further coupled to the uplink fibers of the first and second fiber paths via an optical splitter. The node further monitors a signal quality of a downlink optical signal and communicates to the hub information indicative of the signal quality. The hub switches communications between the hub and the node from the first to second fiber path based on the information.

A method includes providing outgoing optical signals for transmission by a monostatic optical terminal using multiple transmit channels and providing incoming optical signals obtained by the monostatic optical terminal to multiple receive channels. The method also includes using a polarization beam splitter/combiner to combine the outgoing optical signals into a combined outgoing optical signal and to split a combined incoming optical signal into the incoming optical signals. The method further includes using at least one feedback loop to adjust an aim or path of at least one of the outgoing optical signals or at least one of the incoming optical signals. The method may optionally include using an optical element to convert polarizations of the combined outgoing optical signal in order to generate an output signal and to convert polarizations of an input signal in order to generate the combined incoming optical signal.