Frequency division multiplexed optical networks using heterodyne detection

The optical heterodyne process is described. Because the best attainable system gain (transmitter power divided by receiver sensitivity) is only about 50 dB for lightwave systems, as compared with values approaching 100 dB at radio frequencies, it is extremely important in building an optical networ...

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Bibliographic Details
Published in:IEEE network 1989-03, Vol.3 (2), p.13-20
Main Author: Linke, R.A.
Format: Article
Language:English
Subjects:
Control systems
Frequency division multiplexing
Optical control
Optical fiber networks
Optical interconnections
Optical mixing
Optical receivers
Optical sensors
Optical transmitters
Radio transmitters
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Summary:The optical heterodyne process is described. Because the best attainable system gain (transmitter power divided by receiver sensitivity) is only about 50 dB for lightwave systems, as compared with values approaching 100 dB at radio frequencies, it is extremely important in building an optical network (such as a local area network, or LAN) to minimize excess tap losses. It is shown that a star coupler provides a nearly ideal means for interconnecting a multiterminal network. Three areas in which problems unique to optical systems have been discovered are discussed. Theses are transmitters for coherent optical systems, optical frequency determination and control, and polarization control and optical receivers. Experimental progress is briefly discussed.< >
ISSN:0890-8044
1558-156X
DOI:10.1109/65.21906