Optical fiber connection navigation system using visible light communication in central office
An optimized optical-fiber-connection system for central offices is described. This system employs visible-light communication to reduce costs while maintaining the functions and usability of an earlier system. Little skill is needed to realize optical-fiber connection.
Visible Light Communication System Using Low-speed Image Sensor and Two-dimensional Optical Scanner
Visible light communication (VLC) is an optical wireless communication scheme that has potential uses in indoor navigation and in cooperation among vehicles. To receive data efficiently using commercial devices (e.g., smartphones), we proposed a VLC system using a low-speed image sensor and a one-dimensional optical scanner (polygon mirror and MEMS mirror) at a receiver (Rx). In this system, when a rapidly blinking light is incident to the Rx, the light is converted to a dotted and dashed line by an optical scanner, enabling the Rx to receive multiple bits modulated at a high frequency within one frame. However, a scanned signal overlaps with a scanned noise on the image-sensor under the condition that the signal and noise sources exist in the same scanning direction. In this paper, we address this signal-to-noise interference problem by using a two-dimensional optical scanner (galvo mirror). In our improved VLC system, the Tx emits a rapidly blinking light to the Rx. The Rx measures the positional relationship between the signal and noise sources prior to the communication. Then the Rx scans the incoming light using a galvo mirror, whose scanning direction is established to minimize the signal-to-noise interference. The performance of our improved system was evaluated in experiments. The experimental results suggested that the improved system could reduce interference between signal and noise while providing superior communication quality.
Broadband Optical Access Technologies to Converge towards a Broadband Society in Europe
This paper provides insights on the status of broadband optical access market and technologies in Europe and on the expected trends for the next generation optical access networks. The final target for most operators, cities or any other player is of course FTTH (Fibre To The Home) deployment although we can expect intermediate steps with copper or wireless technologies. Among the two candidate architectures for FTTH, PON (Passive Optical Network) is by far the most attractive and cost effective solution. We also demonstrate that Ethernet based optical access network is very adequate to all-IP networks without any incidence on the level of quality of service. Finally, we provide feedback from a FTTH pilot network in Colmar (France) based on Gigabit Ethernet PON technology. The interest of this pilot lies on the level of functionality required for broadband optical access networks but also on the development of new home network configurations.