Bio-Optical Modelling ? Phytoplankton Absorption in ocean water

Optical methods are well posed to provide an alternative solution for high bandwidth communications in undersea compared to the traditional acoustic links. The most common optical communications modulation scheme used for free space optical link is on-off key (OOK) and this modulation method has been usually adopted in underwater wireless optical link due to its simplicity in system implementation. Pulse Position Modulation (PPM) also sometimes known as pulse-phase modulation is a system in which the amplitude and width of the pulse is kept constant (L ,the number of levels).The position of each pulse, in relation to the position of a recurrent reference pulse, is varied by each instantaneous sampled value of the modulating wave. This is often used in optical communication, such as fiber optics, in which there is little multipath way interference.