Tunable all-optical format conversion for BPSK to OOK based on highly nonlinear optical loop mirror

Yang, Zhitian; Wang, Hongxiang; Ji, Yuefeng

doi:10.1016/j.optcom.2020.125907

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…Direct modulation format and wavelength conversion in the optical-domain converting from a PAM to PSK signal to an IQ modulated signal using nonlinear optical effects such as cross-phase modulation (XPM) and four-wave mixing (FWM) has been demonstrated to construct a future optical-based HNGN [5][6][7][8][9]. Research on PSK to PAM signal conversion [10][11] and PSK to quadrature amplitude modulation conversion [12][13][14][15] using similar nonlinear optical effects has been demonstrated for a long period. When generating nonlinear optical effects, semiconductor optical amplifier such as active device is superior in miniaturization.…”

Section: Introductionmentioning

confidence: 99%

DNN-assisted phase distance tuned PSK modulation for PAM4-to-QPSK format conversion gateway node

et al. 2022

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An optical gateway to convert four-level pulse amplitude modulation to quadrature phase shift keying modulation format having shaping gain was proposed for flexible intensity to phase mapping which exploits non-uniform phase noise. The power consumption of the optical modulation format conversion can save by making a DNN-based decision on the receiver side for the generated QPSK signal with non-uniform phase noise. A proof-of-principle experiment has shown that an optically geometric constellation shaped QPSK modulated signals generated from regular PAM4 signals with Gaussian-distributed noise. The shaped QPSK signal shows BER and generalized mutual information improvement by 1dB gain through the use of digital neural network signal recovery.

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