Patent ID: 6266171
Filing Date: 2001-07-24
Classification: H04B

Abstract:
A method for reducing interference effects from unwanted optical and signal energy components in an optical transmission system comprising the steps of:providing a first URZ coded representation of data to be transmitted via said optical transmission system and applying said first URZ-coded data to modulate an optical carrier signal transmitted via said optical transmission system;providing a second URZ coded representation of said data to be transmitted and applying said second URZ coded data to modulate an optical carrier signal, wherein said second URZ coded data is delayed relative to said first URZ coded data by a predetermined amount;at a receiving location for said optical transmission system, recovering said transmitted first URZ and said second URZ coded data signals;subtracting said received second URZ modulated signal from said received first URZ modulated signal to produce a difference signal;operating on said difference signal to regenerate said first URZ and said second URZ coded representations of said data to be transmitted, said regenerated first URZ and second URZ coded data being substantially free of interference effects from said unwanted optical and signal energy components; andsumming said regenerated first URZ and second URZ coded signals.