DocumentCode :
1122659
Title :
Video transmission characteristics in WDM star networks
Author :
Shibagaki, Taro ; Ibe, Hiroyuki ; Ozeki, Takeshi
Author_Institution :
Toshiba Corp., Kawasaki, Japan
Volume :
3
Issue :
3
fYear :
1985
fDate :
6/1/1985 12:00:00 AM
Firstpage :
490
Lastpage :
495
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.
Keywords :
Image communication; LANs; Local-area network (LAN); Optical fiber communication; Wavelength-division multiplexing; Couplings; Demodulation; Diode lasers; Fluctuations; Frequency modulation; Local area networks; Pulse modulation; Signal to noise ratio; WDM networks; Wavelength division multiplexing;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/JLT.1985.1074250
Filename :
1074250
Link To Document :
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