Abstract
We propose and experimentally demonstrate dynamic control of phase-matching
in fiber-based four-wave mixing (FWM) for wavelength conversion of communication
signals. By introducing self-compensation of optical gain/loss with stimulated
Brillouin scattering (SBS) pump and Stokes waves, the FWM phase-matching condition
and hence the conversion efficiency (CE) can be flexibly controlled. The phase
difference between the interplaying fields is manipulated by modifying the
refractive index through SBS without disturbing the initial parameters of
the FWM process. The scheme is first applied to wavelength conversion of 10
Gbit/s non-return-to-zero (NRZ) on-off-keying (OOK) signal. Its performance
on phase-transparent wavelength conversion is subsequently examined using
10 Gbit/s NRZ differential-phase-shift-keying (DPSK) signal. Eye diagrams,
FWM spectra and bit-error rate (BER) performances for the converted signals
without SBS, with gain-transparent SBS for maximum CE and for minimum CE are
analyzed. In the OOK/DPSK wavelength conversion with gain-transparent SBS,
the CE has been reduced by 10.7/11.4 dB at a signal-pump spectral spacing
of 1.9/1.94 nm; while it has been enhanced by 8.8/7.4 dB at a signal-pump
spectral spacing of 4.1/4.07 nm. The pronounced enhancement of the CE at large
signal-pump spectral spacing results in enlargement of the 3-dB FWM conversion
bandwidth. Limitations in the extent of bandwidth enlargement and noise performance
are discussed. Potential use of the scheme in other applications is also described.
© 2013 IEEE
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