Abstract
Photon sources based on spontaneous four-wave mixing (FWM) in optical fibres have been studied for many years due to their typically high brightness and ease of integration with standard single-mode optical fibres. In addition, considerable separation between the generated pair photon wavelengths can be achieved for such sources, making them particularly well suited for quantum communications applications [1]. Recent developments in photon pair generation in fibre-based sources have focussed on engineering the fibre dispersion in order to eliminate spectral correlation between the generated photons, without resorting to lossy filtering, in order to achieve spectral purity. The most common approach involves generating photons polarized orthogonally to the pump beam, with the fibre birefringence used to satisfy the FWM phase-matching requirements. This was demonstrated first in photonic crystal fibres [2,3], and later in highly birefringent conventional fibre [4,5], although to date the reported signal and idler wavelengths in these experiments have for the most part been limited to wavelengths of 900 nm or less due to the use of Ti:Sapphire pump sources.
© 2013 IEEE
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