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European Conference on Optical Communication

Self-pumping Wavelength Conversion of Mixed Order PSK Signals by FWM to Realise Band Conversion

Kyle R. H. Bottrill, David J. Richardson, Francesca R. Parmigiani, Periklis Petropoulos

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We present an FWM based wavelength conversion that differs from the typical approach in requiring no additional pump sources; two PSK signals are mixed in an HNLF, effectively pumping each other to facilitate wavelength conversion. The approach enables us to demonstrate band conversion as well as conversion of PSK signals of differing order.

DOI
10.1049/cp.2013.1617

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We present an FWM based wavelength conversion that differs from the typical approach in requiring no additional pump sources; two PSK signals are mixed in an HNLF, effectively pumping each other to facilitate wavelength conversion. The approach enables us to demonstrate band conversion as well as conversion of PSK signals of differing order.
Introduction Over the past several decades there has been growing interest in the development of devices for optical wavelength conversion. In Raman converters, a long-wavelength Stokes input is in the presence of a pump transformed into a short-wavelength anti-Stokes output via a Raman-resonant third-order nonlinear process called coherent anti-Stokes Raman scattering (CARS) [1]. In Kerr-based parametric converters, a signal input is in the presence of a pump converted to an idler output via the third-order nonlinear process of non-resonant four-wave-mixing (FWM) [2]. Both types of conversion can occur in silicon waveguides, and as such have great potential for application in optical communication systems.
We investigate both theoretically and experimentally the impact of pump-phase modulation on differential phase shift keying (DPSK) and differential quadrature phase shift keying (DQPSK) signals in fiber-based parametric wavelength converters. It will be shown that the pump-phase modulation used to suppress stimulated Brillouin scattering introduces critical signal degradations and optical SNR penalties on DPSK signals, and more severe on DQPSK signals. Different modulation schemes will be theoretically investigated and the quantitative results are compared to system experiments. Finally, the theoretical results for a single conversion will be extended to multiple conversions to study the cascadability of the wavelength converter.