Optical waveguides – With optical coupler – Plural
Reexamination Certificate
2005-01-11
2005-01-11
Lauchman, Layla G. (Department: 2877)
Optical waveguides
With optical coupler
Plural
C385S047000, C385S034000, C398S079000, C398S084000, C398S082000
Reexamination Certificate
active
06842559
ABSTRACT:
An optical add/drop multiplexer (10, 110) includes a primary input port (16, 21), an express output port (17, 22), an add input port (18, 23), and a drop output port (19, 24). Radiation from the primary input port is reflected by a thin film filter (26), is routed back to the filter by a redirecting arrangement (38, 151-153, 251), is then reflected again by the filter26, and then travels to the express output port. A signal component from the primary input port at a predetermined wavelength is extracted by the filter as it effects the first reflection, and is supplied to the drop output port. An add signal from the add input port is directed by the filter to the express output port.
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Baker & Botts L.L.P.
Lauchman Layla G.
Raytheon Company
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