van den Hul - Optocoupler ToslinkThe OPTOCOUPLER Mk II is one of the best toslink optical fiber cables available on the audio market. What makes the van den Hul OPTOCOUPLER Mk II special is the fact that both ends of the single fiber are shaped in the form of a convex (spherical) lens which has many advantages; The OPTOCOUPLER Mk IIs lens shaped input and output surfaces produce an extra focusing of the light beam. Light entering the cable at an angle is focused and therefore