Chaotic fluctuation of light, which is being intrinsically different from deterministic chaos in lasers, arises from quantum-optic stochastic processes, and it therefore cannot be artificially replicated. When the fluctuation is correlative, however, it will be of more use in practical applications such as cryptographic communications. Throughout various experiments, it was found that a double-ring laser having a common semiconductor gain medium with strong saturation characteristics can produce a stable light beam consisting of negatively correlative dual-color components. Although each component decomposed by chromatic beam splitting is chaotic, their combination regenerates a stable light beam. This means that the photon-number states can be controlled by using an optical processing scheme for a correlative dual-color chaotic beam. How such a beam is generated is explained by a simple numerical simulation using a finite Markov chain model that assumes strong short-term intensity correlation between the components. A possible cryptosystem is presented based on the controllability of the photon-number state.
We propose a metamorphic network system, based on autonomously controlled wavelength division multiplexed devices. We will address the issue of how to assure and manage wavelength accuracy and controllability over the whole network to implement practical optical path routed networks. Our solution uses smart devices with wavelength calibration tables to construct systems that can be self-controlled according to their own stored physical layer information. The devices are interactive and share renewable information and are therefore useful for realizing self-reconfigurable (metamorphic) network systems. To verify the proposed architecture, we performed practical examinations using subsystems with wavelength-managed 'disk filters' in a field trial (Chitose trial).
We have proposed an optical coherence domain reflectometry by synthesis of coherence function (OCDR), for high spatial-resolution measurements of optical waveguide devices. We present the principle of the OCDR and the recent experimental results of the OCDR with spectrum spacing control of many lines. A three-electrode DFB laser diode with wide frequency tunable range is used as the light source to improve the resolution. The spatial resolution of 3 to approximately 4 mm in air has been obtained. Furthermore, overall effects of the performance deterioration factors are theoretically considered.
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