Modulation of signals in optical systems

A method for modulating signals in an optical system comprises generating a digital electrical input signal, dividing the signal into two parts, passing one part of the signal to an electrical inverter, converting the un-inverted and inverted electrical signals to un-inverted and inverted optical si...

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Bibliographic Details
Main Authors: Abdullah, Mohammad Khazani, Dimyati, Kaharudin, Abas @ Ismail, Ahmad Fauzi, Endut, Rosdisham, Abdullah, Fairuz
Format: Patent
Published: 2007
Online Access:http://psasir.upm.edu.my/id/eprint/20430/
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Description
Summary:A method for modulating signals in an optical system comprises generating a digital electrical input signal, dividing the signal into two parts, passing one part of the signal to an electrical inverter, converting the un-inverted and inverted electrical signals to un-inverted and inverted optical signals of different wavelength or of the same wavelength but differently encoding, combining the two optical signals into a single optical fibre, separating the combined signals into an un-inverted and an inverted optical signal, reconverting the two optical signals to two electrical signals, determining the difference in voltage between corresponding bits of the two signals and generating a digital electrical output signal based on that difference. The invention also includes a modulation arrangement for use in the method.