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- W2782213185 abstract "Underwater free-space optical communication (FOC) is widely used in underwater platforms since its wide bandwidth. Light emitting diode (LED) is the light source in FOC systems. However, LED's spectrum is not concentrated which constraints its transmission distance. Also, its package is comparatively large. In this paper, we use laser diode (LD) as a light source to increase the communication distance and reduce the device's volume. Furthermore, LD's bandwidth is greatly larger than LED's, which allows it to produce a narrower width pulse thus reduce the energy consuming. But LD's light divergence angle is small (usually 10°–40°). To enlarge its angle, we design diffuse lenses system to spread lasers. The transmitter can produce 35W, 5ns width laser pulses. Thus it can be used for long distance, wide bandwidth communication. We also design a receiver whose field of view (FOV) is 30°. Both transmitter and receiver devices are less than 8 cm in diameter, 1.5kg in weight. Thus it can be installed on small autonomous underwater vehicles (AUV), and other light weighted underwater platforms. The system uses Pulse Interval Modulation (PIM), and FPGA controls the pulses signal. The devices are linked to underwater platforms by Ethernet." @default.
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- W2782213185 date "2017-09-01" @default.
- W2782213185 modified "2023-09-24" @default.
- W2782213185 title "A free-space underwater laser communication device with high pulse energy and small volume" @default.
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