Modulation of signals in optical systems

• 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/

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.