Patent ID: 6424444
Filing Date: 2002-07-23
Classification: H04B,H04L

Abstract:
An optical transmission system, comprising:a finite-state machine having at least one first type finite state machine (FSM) state and at least one second type FSM state, the finite state machine receiving input values of sequential representations of input information bits, and switching from one of said first type FSM state and said second type FSM state to the other of said first type FSM state and said second type FSM state for a particular one of said input values; and a modulation subsystem for generating an optical electric field having field levels in a first field set and a second field set in response to said first type FSM state and said second type FSM state, respectively, said first field set having an approximately zero level one of said field levels indicative of said particular input value and at least two first non-zero said field levels indicative of other said input values, said second field set having an approximately zero level one of said field levels indicative of said particular input value and at least two second non-zero said field levels redundantly indicative of said other input values, said second non-zero field levels approximately opposite in phase and approximately equal in intensity with said first non-zero field levels, respectively.