Abstract
This paper proposes and numerically demonstrates an all-optical on-off
keying (OOK) to 16 quadrature amplitude modulation (QAM) format conversion
using nonlinear optical loop mirror (NOLM) based on cross-phase modulation
(XPM) and parametric amplification in optical fibers. The 16-QAM signal is
generated by the superposition of two quadrature phase shift keying (QPSK)
signals with different amplitudes. OOK to QPSK modulation format conversion
is achieved by XPM in one highly nonlinear fiber (HNLF). The amplitude ratio
2:1 of two QPSK signals can be realized by parametric amplification. The feasibility
of OOK to 16-QAM modulation format conversion is confirmed at the symbol rate
of 10 Gs/s by numerical simulation with the length of 2 <sup>7</sup> - 1 pseudo random binary sequence
(PRBS) input OOK signals. The tolerance of power deviation of the converter
is also analytically evaluated.
© 2012 IEEE
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