Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-03-27
1998-05-05
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
385 37, H04J 1402
Patent
active
057483493
ABSTRACT:
The present invention provides a gratings-based add-drop multiplexer in which plural optical channels can be added and/or dropped by the same optical device in a manner which avoids transmitting an optical channel through a radiation mode loss region of a Bragg grating. In one embodiment, the add-drop multiplexer comprises a three-port optical circulator, an optical coupler, and a transmission path communicating with both the circulator and the optical coupler. A set of one more Bragg gratings is positioned in the transmission path for reflected signals to be dropped towards the circulator and onto a "drop" path. The through optical signals enter the first coupler input port and are combined with the "add" signals transmitted by the second coupler input port. The coupler optically combines these optical signals and outputs the combined optical signal. Advantageously, the optical signals added by the add-drop multiplexer are not reflected by the set of gratings which are used to drop optical channels, avoiding any problems with transmission through the radiation mode loss region of a grating. Further, because the "add" optical signals are not reflected by the gratings set, the add-drop multiplexer can be used asymmetrically, i.e., more optical channels can be added than are dropped.
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Burke Margaret
Ciena Corp.
Pascal Leslie
LandOfFree
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