2009•Chinese Optics LettersOpen access

All-optical amplitude-shift keying and differential phase-shift keying to differential phase amplitude-shift keying format combination in highly nonlinear fiber

吴琳 Lin Wu, 张德朝 Dechao Zhang, 张帆 Fan Zhang, 陈章渊 Zhangyuan Chen, 徐安士 Anshi Xu

Abstract

We propose an all-optical modulation formats combination scheme that merges an amplitude-shift keying (ASK) signal and a differential phase-shift keying (DPSK) signal into a single differential phase amplitudeshift keying (DPASK) signal based on parametric amplification in a highly nonlinear fiber.By optimizing the power of the ASK channel, formats combination of ASK and DPSK to DPASK signal is successfully demonstrated by computational simulation.The demodulation process of the generated DPASK pulses is investigated and the relationship between optical signal-to-noise ratio (OSNR) penalty and the input ASK power is presented.The proposed scheme may be used for increasing spectral efficiency and all-optical logic device.

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Key concepts: Amplitude-shift keying, Amplitude and phase-shift keying, Keying, Demodulation, Phase-shift keying, Optics, Differential phase, SIGNAL (programming language)