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{\Large \bf Report of Invention Disclosure Form (ROI)}
\ec

{\bf Title of Invention:}  Coherent Receivers for Spectrally Phase
Coded Optical Code Division Multiple Access Communications in
Passive Optical Networking\\

{\bf Abstract of Invention:} This invention offers a new receiver
design for optical code division multiple access communications (OCDMA)
over fiber optic channels.  It permits a maximum number of distinct
communications signals to occupy the same region of optical spectrum in
the fiber without generating \emph{multiple access interference (MAI)}
that would otherwise be proportional to the number of distinct signals.

This work proposes a new coherent OCDMA system that uses \emph{phase
diversity combining} in the receiver, \emph{spectral phase coding} at
the transmitter, and a clever \emph{passive optical networking (PON)}
scheme to provide interference-free access to optical networks such as
the Internet with maximal {\it spectral efficiency,} the amount of
information transmitted per unit bandwidth.  without the use of optical
PLLs or fast nonlinear threshold detectors.

In the proposed scheme, only the relative phase of the “spectral chips”
matters. Yet, the differential scheme offers nearly perfect
orthogonality and complete cancellation of MAI and speckle noise, all
of which are unattainable by other methods. The sensitivity of the
output bit-error rate (b.e.r.) to the number of active users offers a
“fail-soft” capability that is useful in many applications. The
elimination of MAI and speckle noise creates a system exhibiting
efficient spectrum usage, large system capacity, excellent signal
quality, and a means for strong communications security. Of course,
physical component impairments and bitasynchronous reception induce
imperfections that elevate MAI somewhat, but these imperfections can be
successfully dealt with, as is shown in this paper.\\

{\bf Problem Solved:} This invention solves the problem of designing
flexible, efficient, and easily reconfigurable PONs for providing
bidirectional access to networking infrastructure to the home and the
business premises.\\

{\bf Novel Features:}\\

{\bf Detailed Description of the Invention:}  In general, a journal manuscript will satisfy this requirement.\\

{\bf Workable Extent/Scope:}  (Describe the future course of related
work and possible variations of the present invention in terms of the
broadest scope expected o be operable;  for example, desrcibe
operational parameters ofthe device or a component there  of, including
alternative structures for performingthe various functions of the
machine or device.)\\

{\bf References}\\

{\bf Commercialization}\\

{\bf Potential Commercial Use}\\
\ben
    \item {\bf What products can be produced with this invention?}
    \item {\bf What is this invention's Stage of Development?}
    (discovery? unspecified?)
\een

{\bf Key Words}\\

{\bf Research Support Information}\\
None.\\

{\bf Agreement Support Information}\\

{\bf Disclosures of the Invention}\\

{\bf Name of Lead Inventor}\\
etc, etc,\\




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