Experimental Demonstration of Underwater Optical Communication Using PPM Modulated 532 nm DPSS Laser

In this paper, we experimentally demonstrate the performance of underwater optical communication (UWOC) link over a distance of ~9 m using a 532 nm DPSS laser modulated with pulse position modulation (PPM) data. The optical PPM signals are received using a Si:PMT-based receiver and the link performance is evaluated by measuring the bit error rate (BER) for different values of signal-to-noise ratio (SNR).We demonstrate 1e-3 BER for optical received power levels as low as—60 dBm (1 nW) with a link loss of ~65 dB.