Patent ID: 8270839
Filing Date: 2012-09-18
Classification: H04B

Abstract:
1. A method for modulating data onto a plurality of optical signals, comprising: mapping said data onto sets of symbol values according to a channel coding alphabet; transmitting said sets of symbol values as a plurality of optical signals by displaying them as a plurality of regions with time-varying intensity for a pre-determined symbol period with the intrinsic intensity amplitude of each of said plurality of optical signals set to intensity levels chosen from a discrete set of coding levels as a function of the symbol value being transmitted; said intrinsic intensity amplitudes selected so that between any two consecutive symbol periods at least one of said plurality of optical signals transitions to a different intrinsic intensity level and so that in every symbol period the intrinsic intensity of at least one of said plurality of optical signals is set to a level that is different from the lowest intensity level of said discrete set of coding levels.