Implementation of a Reconfigurable Optical Logic Gate Using a Single I/Q Modulator With Direct Detection


We tend to propose and investigate a replacement scheme to comprehend all-optical logic gates employing a single I/Q modulator with direct detection. Both intensity and section of the optical signal are utilized to represent the four completely different states of two binary inputs, whereas direct detection is used to map the four states to the corresponding binary output. This structure is very simple and has the potential to succeed in high speed. All of the basic logic gates can be implemented by adjusting the bias voltages of the 2 arms, peak–peak voltages of the driving signals, and also the phase shift. Experiments are successfully applied to appreciate all six basic logic gates at the information rate up to 10 Gb/s with eye diagrams clearly observed. Extinction ratios (ERs) of the output signals are increased for of these logic gates, compared with the first input signals. ER decreases when increasing the info rate from 1 to ten Gb/s. Up to twenty four logic gates will be implemented by employing a single I/Q modulator.

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