Designing issues in design of underwater wireless optical communication system

In designing the underwater optical wireless system, there are many issues that are to be considered. Since water channel is highly attenuating for Ultrasound and RF, optical signal is a suitable candidate. However, the choice of wavelength depends on the water characteristics. Moreover in designing the optical transmitter system the modulation scheme that can perform better is to be studied. This paper presents the performance of optical wireless communication system based on the water type, wavelength choice, photon detector sensitivity and modulation technique and enable one to design an optimum underwater wireless optical communication system. In particular, we contrast the performances of On-Off keying, Pulse Position Modulation and Differential PPM, when a PIN and avalanche photodiode is used at the receiver for different water types.