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Regenerative properties of interferometric all-optical DPSK wavelength converters

: Wang, J.; Maitra, A.; Freude, W.; Leuthold, J.

Postprint (1 MByte; PDF; )

Optics Express 17 (2009), No.25, pp.22639-22658
ISSN: 1094-4087
Journal Article, Electronic Publication
Fraunhofer HHI ()

We discuss an all-optical DPSK wavelength conversion scheme comprising a delay-interferometer demodulation stage followed by a Mach-Zehnder interferometer, the arms of which are formed by nonlinear wave-guides. If operated properly, the configuration shows regenerative beha-viour. This is true for nonlinear waveguides with a dominant cross-gain nonlinearity (e. g., for an electro-absorption amplitude modulator) as well as for the case of a dominant cross-phase nonlinearity (e. g., for Kerr effect based phase modulator). In addition, we show that nonlinear materials exhi-biting cross-gain modulation properties can provide a binary phase response so far only known from the transfer functions of digital electronics.