Clemmen S, Phan Huy K, Bogaerts W, Baets R G, Emplit Ph, Massar S
Laboratoire d'Information Quantique, CP 225, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Bruxelles, Belgium.
Opt Express. 2009 Sep 14;17(19):16558-70. doi: 10.1364/OE.17.016558.
Silicon waveguides are promising chi(3)-based photon pair sources. Demonstrations so far have been based on picosecond pulsed lasers. Here, we present the first investigation of photon pair generation in silicon waveguides in a continuous regime. The source is characterized by coincidence measurements. We uncover the presence of unexpected noise which had not been noticed in earlier experiments. Subsequently, we present advances towards integration of the photon pair source with other components on the chip. This is demonstrated by photon pair generation in a Sagnac loop interferometer and inside a micro-ring cavity. Comparison with the straight waveguide shows that these are promising avenues for improving the source. In particular photon pair generation in the micro-ring cavity yields a source with a spectral width of approximately 150 pm resulting in a spectral brightness increased by more than 2 orders of magnitude.
硅波导是很有前景的基于三阶非线性效应的光子对源。到目前为止的演示都是基于皮秒脉冲激光器。在此，我们首次对连续状态下硅波导中的光子对产生进行了研究。该光源通过符合测量来表征。我们发现了早期实验中未注意到的意外噪声的存在。随后，我们展示了将光子对源与芯片上的其他组件集成方面的进展。这通过在萨格纳克环形干涉仪和微环腔内产生光子对得到了证明。与直波导的比较表明，这些是改善光源的有前景的途径。特别是在微环腔内产生光子对得到了一个光谱宽度约为150皮米的光源，其光谱亮度提高了两个多数量级。
