QPSK-to-2◊ BPSK wavelength and modulation format conversion through phase-sensitive four-wave mixing in a highly nonlinear optical fiber.
|Published article - Optics Express - November 2013 |
Optics Express, vol. 21, no. 23, pp. 28743-28750, November 2013.
F. Da Ros, K. Dalgaard, L. Lei, J. Xu, C. Peucheret
A phase-sensitive four-wave mixing (FWM) scheme enabling the simultaneous conversion of the two orthogonal quadratures of an optical signal to different wavelengths is demonstrated for the first time under dynamic operation using a highly nonlinear optical fiber (HNLF) as the nonlinear medium. The scheme is first optimized with respect to the power levels and phases of the four phase-coherent pumps. The successful modulation and wavelength conversion of the two complex quadratures of a quadrature phase-shift keying (QPSK) signal to two binary phase-shift keying (BPSK) signals is then demonstrated experimentally with no power penalty at a bit-error-ratio (BER) of 10^-9 compared to direct interferometric demodulation of the QPSK signal.
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