A coherent transceiver system includes a local oscillator (LO) light source to generate an LO optical signal. An adaptive fiber array is coupled to the LO light source to dephase the LO optical signal. A balanced detector is coupled to the adaptive fiber array to receive a dephased LO signal from the adaptive fiber array and an optical input signal and to generate a heterodyne signal. A controller receives the heterodyne signal and generates one or more control signals. The adaptive fiber array utilizes the control signals to dephase the LO optical signal.

Optical communication systems and methods using coherently combined optical beams are disclosed. A representative system includes a first data source for sending first data at a first frequency of a first optical beam to a first aperture, and at a second frequency of a second optical beam to a second aperture. The system further includes a second data source for sending second data at a third frequency of a third optical beam to the first aperture, and at a fourth frequency of a fourth optical beam to the second aperture. The system also includes a first interleaver of the first aperture configured to interleave the first data at the first frequency and the second data at the third frequency; and a second interleaver of the second aperture configured to interleave the first data at the second frequency and the second data at fourth frequency.

An optical beam is provided from a transmitter aperture to a receiver aperture that receives the optical beam after displacement by a path shifting component. Received initial displacement information characterizing at least one of: an initial estimate of the displacement, or an indication that the displacement is below a predetermined threshold. Received input beams each have a different spatial mode, from a set of mutually orthogonal spatial modes that include: a lowest order spatial mode, a highest order spatial mode, and one or more intermediate order spatial modes. A relative amount of each of the input beams to be included in the optical beam is determined based at least in part on: corresponding diffraction loss estimates for each of the input beams, and the initial displacement information. One of the input beams that has a largest relative amount in the optical beam is one of the intermediate order spatial modes.

Systems and methods are described for transmitting information optically in free space. For instance, a system may include an optical signal generator to generate an amplified beam of light. A telescope transmits the amplified beam through the medium and receives an inbound beam of light. A detector system may include one or more (or multiple) detectors and a routing system that transmits the inbound beam to a selected set of detectors. In some cases, the system can determine a re-configuration condition based on control parameters and perform a system re-configuration to direct the inbound beam to a different set of detectors. In some cases, the system includes a remote fiber head or wavelength division multiplexing.

Optical communication systems and methods using coherently combined optical beams are disclosed. A representative system includes a first mirror having a first actuator for adjusting a position of the first mirror in a path of a first optical beam and a first optical detector for receiving light reflected from the first mirror. The system also includes a second mirror having a second actuator for adjusting a position of the second mirror in a path of a second optical beam and a second optical detector for receiving light reflected from the second mirror. The system includes an interferometer for measuring an interference between the first and second optical beams and a third optical detector for receiving light from the second interfered optical beam. Intensity of the first interfered optical beam is increased by the interference, and intensity of the second interfered optical beam is decreased by the interference.

Enhancements in optical beam propagation performance can be realized through the utilization of ultra-short pulse laser (USPL) sources for laser transmit platforms, which are can be used throughout the telecommunication network infrastructure fabric. One or more of the described and illustrated features of USPL free space-optical (USPL-FSO) laser communications can be used in improving optical propagation through the atmosphere, for example by mitigating optical attenuation and scintillation effects, thereby enhancing effective system availability as well as link budget considerations, as evidenced through experimental studies and theoretical calculations between USPL and fog related atmospheric events.

Optical communication systems and methods using coherently combined optical beams are disclosed. A representative system includes a first mirror having a first actuator for adjusting a position of the first mirror in a path of a first optical beam and a first optical detector for receiving light reflected from the first mirror. The system also includes a second mirror having a second actuator for adjusting a position of the second mirror in a path of a second optical beam and a second optical detector for receiving light reflected from the second mirror. The system includes an interferometer for measuring an interference between the first and second optical beams and a third optical detector for receiving light from the second interfered optical beam. Intensity of the first interfered optical beam is increased by the interference, and intensity of the second interfered optical beam is decreased by the interference.

The present invention relates to an optical communication system and an optical transmission device. By changing the ratio between the first segment and the segment or/and the amplitude of the second segment, the digital signal is modulated and transmitted in the form of an optical signal. Then a solar panel, which is used as the receiver for the optical signal, can receive the optical signal and give directly the one or more digital signal without demodulation. Thereby, the costs of using a solar panel as the optical receiver may be reduced and the transmission rate may be enhanced.

Optical communication systems and methods using coherently combined optical beams are disclosed. A representative system includes a first data source for sending first data at a first frequency of a first optical beam to a first aperture, and at a second frequency of a second optical beam to a second aperture. The system further includes a second data source for sending second data at a third frequency of a third optical beam to the first aperture, and at a fourth frequency of a fourth optical beam to the second aperture. The system also includes a first interleaver of the first aperture configured to interleave the first data at the first frequency and the second data at the third frequency; and a second interleaver of the second aperture configured to interleave the first data at the second frequency and the second data at fourth frequency.

Optical communication systems and methods using coherently combined optical beams are disclosed. A representative system includes a first mirror having a first actuator for adjusting a position of the first mirror in a path of a first optical beam and a first optical detector for receiving light reflected from the first mirror. The system also includes a second mirror having a second actuator for adjusting a position of the second mirror in a path of a second optical beam and a second optical detector for receiving light reflected from the second mirror. The system includes an interferometer for measuring an interference between the first and second optical beams and a third optical detector for receiving light from the second interfered optical beam. Intensity of the first interfered optical beam is increased by the interference, and intensity of the second interfered optical beam is decreased by the interference.