Fiber Alignment System Research Articles

Application of Particle Swarm Optimization Technique for an Optical Fiber Alignment System

Application of Particle Swarm Optimization Technique for an Optical Fiber Alignment System

Indistinguishable photon pair generation using two independent silicon wire waveguides

We performed a Hong–Ou–Mandel interference experiment with 1.5 μm band photon pairs generated through spontaneous four-wave mixing (SFWM) in two independent silicon wire waveguides (SWWs). To maintain the long-term stability of the coupling between the SWWs and optical fibers without a fiber alignment system, we employed fiber module SWWs installed in a rigid metallic case with fiber array interfaces. In addition, those signal photons that passed through a beam splitter (BS) were detected by high-speed single-photon detectors that used InGaAs avalanche photodiodes operated in a gated mode with a high gate frequency of 500 MHz. With these novel technologies, we successfully observed a quantum interference with a visibility of 73% without subtracting accidental coincidence counts in the fourfold coincidence measurement.