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Narrow-beam laser technology enables communications between underwater vehicles
Amiet R. Kashyap on Twitter: "Btw DRDO's SSPL has also developed a Blue Laser Diode based submarine communication sys. It uses Blue GaN laser diode directly modulated by pre-leveled 16-QAM(quad) orthogonal frequency
Laser Diving Flashlight Red Blue Green LED Laser Underwater Light Torch Waterproof 100m Powerful Tactical Scuba Dive Light Lamp|LED Underwater Lights| - AliExpress
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