An important meeting concerning about green laser pointer

Space laser communication is the use of the laser beam as a carrier, such as free space in the atmosphere, outer space, the direct transmission of light information in a communication. Opened up new communication channels that can significantly increase the modulation bandwidth, transfer rate and large amount of information (up to 10G/min), optical power can focus on a very narrow beam, the device size, weight, power consumption significantly reduced, the communication link between the electromagnetic disturbance, confidentiality, and a significant reduction in the ground station. The leaders are holding an important meeting concerning about  green laser pointer   .
The mid-1960s, the United States began to implement space optical communications research program. U.S. National Aeronautics and Space Agency (NASA) Jet Propulsion Laboratory (JPL) has been back in the 1970s for satellite laser communications research, other issues such as Lincoln, and other famous Bell Labs have also carried out research space laser link . Japan in the mid-1980s space optical communications research, and was succeeded in July 1995 in Japan, the engineering test satellite ETS-VI satellite and ground stations to the link between the optical communication experiment, which is the world's first successful for the space optical communications experiments. European Space Agency (ESA) in the summer of 1977, it launched a high data rate space laser link research in this field has some of the key technology in the clear leader. The data in the working instruction of    green laser pointer    should be referred to.
China's satellite optical communication research and the United States, Europe and Japan compared to the late start, currently only a few units (such as the University of Electronic Science and Technology, Harbin Institute of Technology, Wuhan University) for satellite optical communication research work, which involves the basis of satellite optical communication technology and the basic components of research, and key technologies. Currently, the HIT optical communications research project has entered the stage of real, moving to the pilot phase space. Satellite optical communication system consists of the following main subsystems: source subsystem. In satellite laser communication, communication light source is essential. It directly affects the antenna gain, detector selection, antenna diameter, communication distance and other parameters. The dispatcher added 2 more workers to the night shift of    green laser pointer    .
Most of the laser communication system using semiconductor laser or a semiconductor can be pumped YAG solid state laser light and signal light as a beacon of light, wavelength of 0.8-1.5pm near-infrared bands. Usually beacon of light modulation frequency of several Hz to several kilohertz or thousands of hertz to a few kHz, in order to overcome the interference of background light. Transmitter and receiver subsystems. Transmitter and receiver subsystem is the satellite optical communication system one of the key subsystems. Optical transmitter can be broadly considered to be light sources, modulators and optical antenna cascade (Figure). Signal modulation, demodulation, detection subsystem. The role of modulation will be required to send the signal modulation to the optical carrier. Demodulation is the optical signal through Media Converter parts converted to electrical signals. Detection include filtering and amplification. The workshop has imported a set of very advanced equipment of process   usa green laser pointer    .
Targeting, acquisition, tracking subsystem. The PAT system. Complete long-distance transmission of light will have a great loss of light energy, the received optical signal is often very weak, in addition, will also have a strong background light interference, which greatly increases the difficulty of the optical signal receiver. Thus, in the far distance and a strong background interference, how to capture, alignment and tracking beam, is a light, mechanical, electrical and combined with the sophisticated technology, but also the core technology of laser communications. As the laser communication system communication signal beam divergence is very small, so if the use of the signal beam to target, capture will be very difficult process, so the beam to complete the capture, tracking and targeting, usually beacon of light to complete. The working condition of warehouse of    green laser pointer    is better than before.