Blue-green laser is featured by a short wavelength, high energy, easy underwater transmission and strong anti-jamming capability, etc. In recent years it has cut a figure in the military field. In order to explore the security communication problems of bluegreen laser, an encrypted communication device of underwater blue-green laser based on the FPGA is designed. The device is composed of data encryption equipment, data decryption equipment, and laser transmitter and laser receiver. With blue-green laser being the carrier, the AES algorithm is embedded in the FPGA chip to realize 128-bit encryption and decryption on chip-level. The experimental results show that the device can satisfy the stability, real-time and security demand of underwater communication. And the feasibility of applying blue-green laser in secure underwater communication field is verified.
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