Optical communications – Multiplex – Optical switching
Reexamination Certificate
2006-07-06
2010-11-09
Tran, Dzung D (Department: 2613)
Optical communications
Multiplex
Optical switching
C398S052000, C398S075000
Reexamination Certificate
active
07831146
ABSTRACT:
A bidirectional optical network, in which an incoming/downstream modulated optical signal(s) of a particular wavelength may carry content from a headend to a subscriber. An incoming/downstream unmodulated continuous wave optical signal(s) from the headend is time-shifted (i.e., time delayed with respect to just received incoming/downstream optical signal(s)), collected, modulated and sent back as return/upstream optical signal(s) from the subscriber to the headend. The return/upstream optical signal(s) may have the same wavelength or a slightly shifted wavelength relative to incoming/downstream optical signal(s). Wavelength, bandwidth, subscriber priority and service (content) provider may be fixed, dynamically, or statistically assigned. A modulated marker optical signal(s) is sent along with a modulated data optical signal simultaneously in a different plane. The modulated data optical signal(s) can therefore be securely delivered to a subscriber(s) according to the marker identification. Furthermore a device can be constructed from a group of components comprising an integrated tunable laser-modulator, a wavelength converter, a cyclic arrayed waveguide grating router, a photonic bandgap cyclic arrayed waveguide grating router, a burst enabled detector in order to electro-optically connect network elements, processors and chipsets on a printed circuit board.
REFERENCES:
patent: 5930015 (1999-07-01), Yamamoto et al.
patent: 2005/0259989 (2005-11-01), Sorin et al.
patent: 2006/0228113 (2006-10-01), Cutillo et al.
patent: 2007/0019956 (2007-01-01), Sorin et al.
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