Abstract: The present invention provides a method and an FSK/IM receiver to solve the problem of burst-mode detection of frequency modulated labels on an ASK (or IM) payload. In accordance with one embodiment of the present invention, two FSK tones of an input FSK/IM optical signal are separated and communicated to a balanced detector. At the balanced detector, the two FSK tones are subtracted from each other and result in an AC-coupled data stream. The AC-coupled data stream is communicated to a Schmitt-trigger where the hysteresis of the Schmitt-trigger finally eliminates any residual ASK (or IM) payload in the recovered output data. The present invention provides both single channel and WDM solutions.

Abstract: The present invention provides a method, apparatus and system for a protocol and line-rate transparent WDM passive optical network architecture that scales in terms of bandwidth and number of ONUs. Both an included optical line terminal and each of a plurality of ONUs use substantially the same reflective modulators to modulate respective wavelength channels to impart data thereto. In various embodiments of the present invention, the reflective modulators are composed of a SOA having on one facet a pigtailed fiber and the other facet coated with a highly reflective coating. In the WDM passive optical network of the present invention, the ONUs each comprises a separate wavelength for communication in the upstream and the downstream directions. The present invention allows for all-passive components to be placed in the field, thus, requiring no power between a central office and a user or subscriber's premises.

Abstract: The present invention provides a method, apparatus and system for a protocol and line-rate transparent WDM passive optical network architecture that scales in terms of bandwidth and number of ONUs. Both an included optical line terminal and each of a plurality of ONUs use substantially the same reflective modulators to modulate respective wavelength channels to impart data thereto. In various embodiments of the present invention, the reflective modulators are composed of a SOA having on one facet a pigtailed fiber and the other facet coated with a highly reflective coating. In the WDM passive optical network of the present invention, the ONUs each comprises a separate wavelength for communication in the upstream and the downstream directions. The present invention allows for all-passive components to be placed in the field, thus, requiring no power between a central office and a user or subscriber's premises.