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An irradiation test was performed for polymethylmethacrylate (PMMA) plastic optical fibers (POFs) under low dose-rate gamma-ray irradiation in order to use the fiber in low-level radiation environments. Radiation-induced loss that has peaks in the ultraviolet and near infrared wavelength range and improvement in the optical transmission over an entire wavelength range were observed under the irradiation...
A new thermal imaging method that senses the change in Si index of refraction as a function of temperature to visualize temperature distributions of LSI circuits is described. The resolution is not limited by the heat radiation wavelength but by the sensing light source, which is usually around 1μm. The method further extends the application into the areas that require both high spatial and temporal...
Radio on free space optics (RoFSO) is being developed to realize a cost effective and universal platform for heterogeneous wireless services as same as RoF. The developed RoFSO transceiver can directly transmit some RoF signals from an optical fiber and can receive an RoFSO signal from air into a fiber core. It can achieve an free space for various types of wireless services in an optical wireless...
With the increase of communication demand and the emergence of new services, various wireless technologies have been deployed recently. To achieve the goal of ubiquitous communication, however, a universal platform is necessary to connect all the network facilities and make them communicate together. The transmission of radio on fiber (RoF) has been realized as an attractive means to reach this target...
Radio on free space optics (RoFSO) is being developed to realize a cost effective and universal platform for heterogeneous wireless services as same as RoF. The developed RoFSO transceiver can directly transmit some RoF signals from an optical fiber and can receive an RoFSO signal from air into a fiber core. It can achieve an free space that is transparent for various types of wireless services in...
This paper presents a new statistical model of optical intensity fluctuation (scintillation), considering time correlation of atmospheric propagated optical signal in RoFSO (radio on free space optics) channel. Relationships among frequency characteristic of RoFSO channel, variance of optical intensity, and atmospheric temperature are examined. A p.d.f(probability density function) of scintillation...
Transmission of modulated RF signal using FSO communications links is receiving a lot of research interest recently. We are developing a new advanced DWDM RoFSO link system capable of transmitting multiple RF signals. In this paper, we present results from analytical modeling reflecting on the design parameters of the RoFSO system to evaluate and predict its performance. The parameters of interests...
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