Multiplex communications – Wide area network – Packet switching
Patent
1982-08-26
1988-05-03
Sikes, William L.
Multiplex communications
Wide area network
Packet switching
350 9615, 350 9616, 350 9618, 350402, 370 2, 370 3, G02B 634, H04B 900
Patent
active
047415886
ABSTRACT:
In optical multiplexers and demultiplexers which utilize interference filters and optical gratings losses and noise are reduced by converting the unpolarized light into linearly polarized light. This improves the efficiency of the filters and gratings and suppresses noise which is caused by fluctuations in the degree of polarization of unpolarized light because filters and gratings have different characteristics for the different polarization directions.
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Haisma Jan
Nicia Antonius J. A.
Van Rooy Theodorus L.
Healy Brian M.
Sikes William L.
Tamoshunas Algy
U.S. Philips Corporation
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