2016results about "Electromagnetic network arrangements" patented technology

The communication system includes a hybride fiber / coax distribution network. A head end provides for downstream transmission of telephony and control data in a first frequency bandwidth over the hybrid fiber / coax distribution network and reception of upstream telephony and control data in a second frequency bandwidth over the hybrid fiber / coax distribution network. The head end includes head end multicarrier modem for modulating at least downstream telephony information on a plurality of orthogonal carriers in the first frequency bandwidth and demodulating at least upstream telephony information modulated on a plurality of orthogonal carriers in the second frequency bandwidth. The head end further includes a controller operatively connected to the head end multicarrier modem for controlling transmission of the downstream telephony information and downstream control data and for controlling receipt of the upstream control data and upstream telephony information. The system further includes service units, each service unit operatively connected to the hybrid fiber / coax distribution network for upstream transmission of telephony and control data in the second frequency bandwidth and for receipt of the downstream control data and telephony in the first frequency bandwidth. Each service unit includes a service unit multicarrier modem for modulating at least the upstream telephony information on at least one carrier orthogonal at the head end terminal to another carrier in the second frequency bandwidth and for demodulating at least downstream telephony information modulated on at least a band of a plurality of orthogonal carriers in the first frequency bandwidth. Each service unit also includes a controller operatively connected to the service unit multicarrier modem for controlling the modulation of and demodulation performed by the service unit multicarrier modem. A method of monitoring communication channels, a distributed loop method for adjusting transmission characteristics to allow for transmission of data in a multi-point to point communication system, a polyphase filter technique for providing ingress protection and a scanning method for identifying frequency bands to be used for transmission by service units are also included. Also provided is a method and apparatus for performing a Fast Fourier Transform (FFT). In one embodiment, a scalable FFT system is built using a novel dual-radix butterfly core.

A method for testing a fiber drop terminal from a single geographic location may include placing a signal onto a first optical fiber at the single geographic location. The first optical fiber is communicatively coupled to a first output receptacle on the fiber drop terminal. The method may also include detecting the signal via a second optical fiber at the single geographic location. The second optical fiber is communicatively coupled to a second output receptacle on the fiber drop terminal, and the second output receptacle is communicatively coupled to the first output receptacle via a loop-back assembly.

An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The header routing information has sufficiently different characteristics from the data payload so that the signaling header can be detected without being affected by the data payload, and that the signaling header can also be removed without affecting the data payload. The signal routing technique can be overlaid onto the conventional network elements in a modular manner using two types of applique modules. The first type effects header encoding and decoding at the entry and exit points of the data payload into and out of the network; the second type effects header detection at each of the network elements.

A system and method for managing the optical layer network data communications of an optical fiber data network by an optical transceiver module is disclosed. The management of the optical layer network data communications comprising data link layer functions or layer 2 functions in an OSI model. Benefits include reduction in reduced cost of network deployments from consolidation of network equipment, such as switches, and reduction in power consumed as well as enabling point-to-multipoint network connections from previously only point-to-point network connection.

A method for testing a fiber drop terminal from a single geographic location may include placing a signal onto a first optical fiber at the single geographic location. The first optical fiber is communicatively coupled to a first output receptacle on the fiber drop terminal. The method may also include detecting the signal via a second optical fiber at the single geographic location. The second optical fiber is communicatively coupled to a second output receptacle on the fiber drop terminal, and the second output receptacle is communicatively coupled to the first output receptacle via a loop-back assembly.

An all optical network for optical signal traffic has at least a first ring with at least one transmitter and one receiver. The first ring includes a plurality of network nodes. At least a first add / drop broadband coupler is coupled to the first ring. The broadband coupler includes an add port and a drop port to add and drop wavelengths to and or from the first ring, a pass-through direction and an add / drop direction. The first add / drop broadband coupler is configured to minimize a pass-through loss in the first ring and is positioned on the first ring.

One embodiment of the present invention provides a system that facilitates forwarding of packets in an Ethernet passive optical network (EPON), which includes a central node and at least one remote node. During operation, the system assigns a logical link identifier (LLID) to a remote node, wherein an LLID corresponds to a logical link between the central node and a remote node. The system also associates an LLID with a port of a switch within the central node, wherein the switch has a number of ports; wherein a port may be a physical port or a virtual port; and wherein the number of ports on the switch are divided into network-side ports and user-side ports. Upon receiving a downstream packet from a network-side port, the system searches a mapping table to determine whether one or more field values of the downstream packet correspond to any LLIDs or ports. If the one or more field values correspond to an LLID, the system assigns the LLID to the downstream packet and transmits the downstream packet to a remote node.

An optical packet switch uses electric circuits to implement input and output sections of an optical switch that performs packet switching. Retiming of packet data in the output section is facilitated to reduce the scale of the circuitry. In the input section a packet-data signal and a clock signal for retiming the packet data are wavelength multiplexed by a wavelength multiplexer and transferred over the same optical waveguide of the optical switch. In the output section the packet-data signal and the clock signal, which have been transferred from the same optical waveguide in the packet switch, are demultiplexed by a wavelength demultiplexer, and retiming of the packet-data signal is performed by an intra-device frame terminating unit. A frame format comprises, in addition to a flag pattern and a data field, a preamble and dummy data at the beginning and end thereof, respectively, for accommodating skew caused by transfer through the optical switch as well as a period of signal instability produced by switching of the optical switch. The packet data is transferred upon being placed in the data field of the frame format.

A bidirectional optical triplexer is disclosed, which may be connected to an external optical waveguide and receives first and second optical signals having first and second wavelengths through the external optical waveguide, and transmits a third optical signal having a third wavelength. The triplexer includes a platform having first and second trenches spaced from each other on a first optical path optically connected with the external optical waveguide, a first filter positioned in the first trench for reflecting the first optical signal proceeding through the first optical path to a second optical path, and a second filter positioned in the second trench for reflecting the second optical signal proceeding through the first optical path to a third optical path. The triplexer also includes a first optical receiver for detecting the first optical signal proceeding through the second optical path, a second optical receiver for detecting the second optical signal proceeding through the third optical path, and an optical transmitter for outputting the third optical signal to the first optical path. The first and the second optical receiver may be aligned at a first side of the first and the second trenches and the optical transmitter may be aligned at a second side of the first and the second trenches. The first side is opposite to the second side about the first and second trenches.