Sensors, Vol. 24, Pages 2609: 108 m Underwater Wireless Optical Communication Using a 490 nm Blue VECSEL and an AOM

Sensors, Vol. 24, Pages 2609: 108 m Underwater Wireless Optical Communication Using a 490 nm Blue VECSEL and an AOM Sensors doi: 10.3390/s24082609 Authors: Ruiyang Tian Tao Wang Xiaoyu Shen Renjiang Zhu Lidan Jiang Yongle Lu Huanyu Lu Yanrong Song Peng Zhang Advanced light sources in the blue-green band are crucial for underwater wireless optical communication (UWOC) systems. Vertical-external-cavity surface-emitting lasers (VECSELs) can produce high output power and good beam quality, making them suitable for UWOC. This paper presents a 108 m distance UWOC based on a 100 mW 490 nm blue VECSEL and an acousto-optic modulator (AOM). The high-quality beam, which is near diffraction-limited, undergoes relatively small optical attenuation when using a conventional avalanche photodiode (APD) as the detector and employing 64-pulse position modulation (PPM). At the time-slot frequency of 50 MHz, the bit error rate (BER) of the UWOC was 2.7 × 10−5. This is the first reported AOM-based UWOC system with a transmission distance over 100 m. The estimated maximum transmission distance may be improved to about 180 m by fully utilizing the detection accuracy of the APD according to the measured attenuation coefficient of the blue VECSEL used. This type of UWOC system, composed of a high-beam-quality light source and a conventional detector, make it more closely suited to practical applications.
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research
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