Optical communications – Multiplex – Optical switching
Reexamination Certificate
2005-03-22
2005-03-22
Sedighian, M. R. (Department: 2633)
Optical communications
Multiplex
Optical switching
C398S041000, C398S046000, C398S065000, C398S074000, C398S082000, C398S083000, C398S084000, C398S085000, C398S086000, C398S087000, C398S088000, C359S494010, C359S490020, C359S490020, C359S490020, C359S490020, C359S490020, C359S506000
Reexamination Certificate
active
06871022
ABSTRACT:
Methods and apparatus for multiplexing and demultiplexing optical signals. An interleaver having a modified Mach-Zehnder interferometer as a first stage is used as a wavelength division multiplexer. This first stage is combined with one or more cascaded stages, each having a beam splitter and an optical delay element. A light beam including a number of signals at different wavelengths is received. The beam is split such that approximately half of each signal is contained in one of two sub-beams. One of the two sub-beams passes through a delay element, which provides a phase shift. The two sub-beams are recombined and split again. Each wavelength adds constructively or destructively in the new sub-beams such that the signals are separated—some wavelengths are in one of the new sub-beams, some are in the other. One of these sub-beams is delayed, and the two are combined and split again, improving the separation.
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Kovach Karl D.
Nguyen Chau M.
Sedighian M. R.
Stratos International, Inc.
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