Journal ArticleDOI
Video transmission characteristics in WDM star networks
TLDR
In this article, the authors proposed a system employing a wavelength-division multiplexed star network which is satisfactory for the transmission of video signals in addition to digital data, and reports the evaluation results of the video transmission characteristics of the system employing 32 port-pair passive star coupler.Abstract:
In local area networks (LAN's), it is desirable to transmit not only digital data but also moving video signals. This paper proposes a system employing a wavelength-division multiplexed star network which is satisfactory for the transmission of video signals in addition to digital data, and reports the evaluation results of the video transmission characteristics of the system employing a 32 port-pair star coupler. Video transmission was realized by the pulsed analogue transmission scheme. Pulse frequency modulation (PFM) and pulsed frequency modulation (pulsed-FM) were studied, and it was found that the SNR fluctuation due to modal noise was less by the pulsed-FM than by the PFM. It was also found that the difference in the modal noise was due to the differences in the demodulation characteristics of PFM and pulsed-FM. A 32 port-pair passive star coupler was used and a maximum of a 5-km network was experimented. The results showed that a good video SNR was obtainable in the experimental star network using laser diodes. Thus the feasibility of the broad-band network, employing a multiport-pair passive star coupler by the wavelength division multiplexing scheme, was proven.read more
Citations
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Journal ArticleDOI
Optical networking update
TL;DR: An inventory of the current state and future prospects for networks in which signal paths between end user nodes remain entirely in optical form without intervening electronic conversions is presented, with an emphasis on wavelength-division multiplexing (WDM).
Journal ArticleDOI
Twelve random access strategies for the fiber optic networks
TL;DR: Twelve random-access strategies that do not constrain the distance or transmission rate of a network, and can use the capabilities of fiber-optic components, are described and compared.
Patent
Optical fiber communication method and multimedia optical fiber network using the same
TL;DR: In this article, an optical fiber communication system for an optical network in which a plurality of types of communication terminal equipments are connected to one another via optical fibers is described, consisting of the steps: conducting wavelength multiplexing using at least three wavelengths.
Journal ArticleDOI
Fiber optic LAN systems and costs
TL;DR: An overall review of nine fibre optic local area network systems used today is made, in terms of topology, access protocol, and trade-offs, which concludes that the double-ring topology with time division multiple access and the circuit/packet switching mode is the most widely used.
References
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Journal ArticleDOI
SNR Fluctuation and Nonlinear Distortion in PFM Optical NTSC Video Transmission Systems
T. Kanada,K. Hakoda,E. Yoneda +2 more
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Journal ArticleDOI
Modal noise and optical feedback in high-speed optical systems at 0.85 μm
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Journal ArticleDOI
Some Design Considerations for Picture Archiving and communication Systems
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Journal ArticleDOI
Small loss-deviation tapered fibre star coupler with mixer rod
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