An OR Gate for 100 Gb/s Phase-Shift Keying Signals in Semiconductor Optical Amplifier-Based Delayed Interferometer

Kotb, Amer
May 2014
Australian Journal of Basic & Applied Sciences;May2014, Vol. 8 Issue 7, p449
Academic Journal
Background: Phase modulation (PM) schemes are attracting much interest for use in ultrafast optical communications systems. PM is much less sensitive to fiber transmission impairments, require lower optical signal-to-noise ratio, is more robust against pattern-dependent degradations and can give higher spectral efficiency compared to conventional intensity modulation formats. This fact has spurred great interest in conducting all-optical operations on phase-shift keying (PSK) modulated data so as to realize exclusively by means of light critical network. Objective: Alloptical logic OR gate for 100 Gb/s PSK modulated data signals is numerically simulated using semiconductor optical amplifiers (SOA)-based Delayed interferometer (DI). Results: The obtained results show that the all-optical OR gate is capable of operating for the first time at 100 Gb/s with high output quality factor (Q-factor). An increase of input pulse energy will make the SOA saturate more easily, which results in a decrease in the Q-factor. The Q-factor decreases when increasing the SOA carrier lifetime and the pulsewidth. The Q-factor is larger for larger the linewidth enhancement factor (a-factor). Conclusion: The performance of all-optical logic OR gate for PSK modulated data signals using the SOA-based DI is simulated. The simulation is carried out at a data speed of 100 Gb/s, which is enabled owing to the concept exploited by the scheme. The effect of input pulse energy, SOA carrier lifetime, pulsewidth and linewidth enhancement factor (a-factor) on the system's output quality factor (Q-factor) is taken into account and investigated in the simulation. The outcome of our work complements the suite of all-optical gates that have been addressed so far for PSK signals.


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