Abstract: A communication signal multiplexing apparatus includes first and second optical receivers, with the second optical receiver configured to receive an optical analog radio signal and to convert it into a corresponding electrical analog radio signal having a carrier frequency and the first optical receiver configured to receive an optical digital communication signal and to convert it into a corresponding electrical digital communication signal having a frequency spectrum. Further, a first electrical filter apparatus is configured to receive the electrical digital communication signal, and comprises a low-pass filter having a cut-off frequency lower than the carrier frequency of the electrical analog radio signal, and applies the low-pass filter to the electrical digital communication signal.

Abstract: Aspects of the subject disclosure may include, for example, receiving a first optical signal from a first optical network via a first port of the wavelength converter, receiving a second optical signal from a second optical network via a second port of the wavelength converter, modulating the first optical signal with the second light signal to generate a third optical signal, eliminating the first light signal from the third optical signal to generate a fourth optical signal, and transmitting the fourth optical signal through the second optical network. The first optical signal can include a first digital signal modulated onto a first light signal of a first wavelength, the second optical signal can include a second light signal can include a second wavelength different from the first wavelength, and the fourth optical signal can include the first digital signal modulated onto the second light signal. Other embodiments are disclosed.

Abstract: An on-vehicle communication system mounted on a vehicle is provided with a master function unit and a plurality of slave function units. The plurality of slave function units are able to transmit uplink communication signals to the master function unit via at least a common optical fiber.

Abstract: Provisioning of Internet Protocol (IP) configuration data or other configuration related data for devices or services connected to a passive optical network (PON) is contemplated. The provisioning may be facilitated with an optical line terminal (OLT) providing the desired configuration data over the PON to an optical network unit (ONU) connected to the device or service desired for provisioning, such as to enable the ONU to provision the device or service without exchanging Dynamic Host Configuration Protocol (DHCP) messaging with a DHCP server.

Abstract: One embodiment provides a system and method for managing traffic in a network that includes at least a passive optical network (PON). During operation, the system obtains traffic status associated with the PON, generates a traffic-shaping factor for the PON based on the traffic status, and applies traffic shaping for each optical network unit (ONU) within the PON using the generated traffic-shaping factor. The traffic-shaping factor determines a portion of a best-effort data rate to be provided to each ONU.

Abstract: The disclosure is directed to an optical telecommunications system which includes a central node and a plurality of user nodes. The central node provides the light necessary to enable communication between the user nodes. Within the central node is a multi-wavelength source, providing lights at different wavelengths, along with a wavelength selector. The wavelength selector selects one of the lights at different wavelengths from the multi-wavelength source for delivery to the user nodes such that the user nodes then modulate this light for transmission between nodes.

Abstract: This disclosure describes a wavelength division multiplexing passive optical network system (100) comprising an optical line terminal (180) for controlling transmission of data that are carried by optical signals across the optical network system along an upstream or downstream path; a signal modulating loop circuit including a circulator (110) connected to the optical line terminal (180) for determining the transmission paths of the optical signals; a splitter (120) connected to the circulator (110) for splitting the optical signals into a first portion of optical signals and a second portion of optical signals according to a predetermined ratio; an amplifier (160) connected to the splitter (120) for amplifying the second portion of optical signals; and a modulator (170) connected in between the amplifier (160) and the splitter (120) for modulating the amplified second portion of optical signals to be transmitted to the circulator (110); a converter (140) connected to the splitter (130) for converting the fi

Abstract: A decryption device for decrypting a document encrypted using biometric information of an intended receiver of the document is provided. The decryption device comprises: an imaging device configured to capture an image of at least a portion of the document; a biometric detection device configured to detect biometric information of a user; a processor configured to decrypt at least the portion of the document using the captured image and the detected biometric information; and a display device configured to display at least the portion of the document decrypted by the processor.

Abstract: Powering an active/splitter and providing information to ONUs to cause adjustments to ONU operating wavelengths. An ONU may identify the port of a splitter to which the ONU is connected in order to make wavelength adjustments. Various techniques enable the ONU to identify from which port the ONU is receiving signals, such as a splitter that splits signals to ONUs in a cable network and signals to one or more ONUs the port to which it is connected. The splitter may lack electrical power and may perform the signal function by harvesting optical power from optical power provided to the splitter. In this manner, an active splitter may behave passively with respect to powering components in the absence of electrical power.

Abstract: A technique in which an outgoing signal is encoded to have multiple signal levels to modulate a light source, in which respective signal levels are indicative of different signal states of more than one bit. The multi-level signal is transmitted on a passive optical network (PON) having passive splitters to split the modulated light to transmit the light having multiple signal levels to a plurality of destinations via the PON.

Abstract: An optical transmission network comprises a multi-wavelength source (7) shared between multiple sets of client side equipment for manipulating electrical signals. A first wavelength selective routing element (5) is connected to the multi-wavelength source (7). Each set of client-side equipment (1) comprises an optical modulator (3) connected to the first wavelength selective routing element (5) and an optical receiver (2). A second wavelength selective routing element (6) is connected to the optical receiver (2) and is operative to direct incoming signals from one or more remote locations to the optical receiver (2). The network provides a WDM architecture solution for networks whereby the cost of implementing and running client side equipment (1) is reduced by not having the WDM source (7) within the client side equipment (1).

Abstract: A control device (13) for scheduling the transmission of signals from a plurality of transmitters (14, 15, 16, 17, 18, 19, 20, 21). The control device (13) comprises an evaluation element (22) arranged to determine the power level of the signals received from each of the transmitters and a scheduling element (23) adapted to determine a transmit schedule comprising the order that the plurality of transmitters should transmit based on the power levels of the signals received from the transmitters (14, 15, 16, 17, 18, 19, 20, 21). A method of operation and a node incorporating the control device is also disclosed.

Abstract: The present invention discloses a multiple star wavelength division multiplexing passive optical network system using a wavelength assignment method. In a multiple star wavelength division multiplexing passive optical network system using a wavelength assignment method according to the present invention, only one WDM-PON system can provide services for a plurality of subscribers who is distributed in a wide range of area through multiple starring, by setting one or more band for transmitting up-stream signals as an up-stream basic band and one or more band for transmitting down-stream signals as a down stream basic band, respectively, and by dividing each of the up-stream basic band and the down stream basic band into a plurality of wavelength sub-bands and assigning the divided sub-bands to different areas using a wavelength division multiplexer/de-multiplexer which splits a band into two or more sub-bands.

Abstract: A method is provided for managing connections in an optical access network. Also provided are a corresponding platform, exchange, network and computer software product. The method manages connections of a plurality of user modules to a plurality of transmission modules of an exchange in an optical access network. The management method includes a dynamic re-arrangement of the connection of at least one of the user modules to at least one of the transmission modules according to at least one predetermined optimization criterion.

Abstract: A system for redundancy in Ethernet passive optical networks (EPONs) facilitates fast recovery from failure (less than 50 msec), path redundancy of the fiber optic network, and location redundancy of the OLTs. An optical networking unit (ONU) in a normal state monitors input communications, and when the input communications are quiet for a predetermined minimum length of time, the ONU transitions to a lenient state in which: the ONU accepts old and new security keys; upon receiving a packet: the ONU updates an ONU timestamp based on the packet's timestamp; and the ONU transitions to the normal state of operation. While the ONU is in the lenient state if a packet is not received for a predetermined given length of time the ONU transitions to a deregistered state. In this system, main and standby OLTs do not require synchronization of security parameters or synchronization for differences in fiber lengths.

Abstract: A method and apparatus for controlling a reflective semiconductor optical amplifier (RSOA) are provided. The RSOA control apparatus sets a threshold current at which a light source starts to oscillate to be constant regardless of a wavelength of seed light by controlling a driving temperature for driving a RSOA, and adjusts an optical characteristic which is differently output for each wavelength of seed light to be constant by controlling a driving current.

Abstract: A method for connecting an AC powered device, which has an optical receiver, with a control circuit, which has an optical transmitter, using at least on optical medium cable includes the steps of terminating the cable at both of its ends, introducing the processed cable between the receiver and transmitter, attaching and securing one end of the processed cable to the transmitter and the other end of the processed cable to the receiver, and propagating a one way optical signal including control commands from the control circuit to the powered device.

Abstract: A method for connecting an AC powered device, which has an optical receiver, with a control circuit, which has an optical transmitter, using at least on optical medium cable includes the steps of terminating the cable at both of its ends, introducing the processed cable between the receiver and transmitter, attaching and securing one end of the processed cable to the transmitter and the other end of the processed cable to the receiver, and propagating a one way optical signal including control commands from the control circuit to the powered device.

Abstract: The invention relates to a method for a telecommunication's network with a central office (CO), an access network, a multiple of demarcation point units (DPUn) and customer premises equipment (ONTn) connected thereto, to assign a customer premises equipment (ONTn) to a subscriber's data record registered in the central office (CO), where when a customer premises equipment (ONTn) reports the received signal amplitude in regular reporting intervals to the central office (CO), a customer premises equipment (ONTn) is assigned to a subscriber's data record by uniquely influencing the signal amplitude by the demarcation point unit (DPUn) assigned to the customer premises equipment (ONTn), the assignment of which to a certain subscriber's data record is known in the central office (CO), where the influencing of the signal amplitude is performed such that a digital signature proper to the demarcation point unit (DPUn) is imprinted on the signal amplitude, where the bit clock underlying the signature is adapted to the

Abstract: A transmission speed of a protection (backup) line using 1G-OLT unit and 1G-ONU unit is set to be lower than a transmission speed of a working (primary) line using 10G-OLT unit and 10G-ONU unit. A priority and band of each communication service in ONU are preset individually and separately every LLID for a working (primary) line and a protection (backup) line. When bands are allocated to the protection (backup) line, the band allocation is performed so as to secure a minimum number of bands of each communication service. A monitoring controller refers to a predetermined band information table according to an operation state of the working (primary) line or the protection (backup) line with respect to a downstream signal packet.

Abstract: Communication from a component in an optical communication system may be effected by modulating a system power voltage across the component to generate voltage signals representing the information to be communicated. The voltage signals generated by the component are detectable in the power feed equipment (PFE) in the optical communication system. Signature analysis may be performed on the system voltage data to identify the voltage signals and determine the information being communicated.

Abstract: For processing an uplink signal from a mobile station without desiring a high AFC capability in any state, in a wireless base station including a plurality of antennas, reception signals from a mobile station are taken in to perform a signal transmission and reception with the mobile station by a first antenna providing a higher reception signal level, in which a switchover from a signal transmission to the mobile station by the first antenna to that by a second antenna is performed when a frequency variation characteristic measured for an allocated frequency of the reception signal from the first antenna indicates that the mobile station is moving away from the first antenna.

Abstract: In a passive optical network system in which signals from a master station to plural slave stations are time-division multiplexed and transmitted, the slave stations different in transmission speed are mixedly contained. The master station (OLU) performs ranging for each transmission speed, and grasps all the slave stations different in transmission speed for each transmission speed, and generates a frame including signals of a suitable transmission speed corresponding to each slave station. When the frame is generated, in a downstream signal in which signals of plural transmission speeds are mixed, a dummy signal is set at a place where the transmission speed is changed, and a time necessary to follow a change in level of a received signal due to a change in optical level caused when the transmission speed is changed is secured. Thereby, each ONU avoids a reception error occurring in the time necessary to follow.

Abstract: A method for connecting an AC powered device, which has an optical receiver, with a control circuit, which has an optical transmitter, using at least on optical medium cable includes the steps of terminating the cable at both of its ends, introducing the processed cable between the receiver and transmitter, attaching and securing one end of the processed cable to the transmitter and the other end of the processed cable to the receiver, and propagating a one way optical signal including control commands from the control circuit to the powered device.

Abstract: A method for localizing an optical network termination (ONT) of a passive optical network is disclosed. The passive optical network comprises an optical line terminal (OLT) and an optical distribution network (ODN) having a plurality of optical links. The ONT is connectable to the OLT by a given optical link of the optical distribution network. The method includes the steps of detecting that the ONT has been connected to the OLT by an optical link of the optical distribution network; determining length information indicative of a length of the optical link; comparing the length information with a reference length information indicative of a length of the given optical link; and if the length information matches the reference length information, localizing the ONT by confirming that it is connected to the OLT by the given optical link.

Abstract: In a passive optical network system, in order that by measuring a transmission distance and a transmission time between an OLT and an ONU in operation of the system, if the distance or the time is short, communication is conducted at a high transmission speed to increase a capacity of user; if the distance or the time is long, communication is conducted at a low transmission speed to increase the capacity of user communicating in a state in which a predetermined quality is secured, a main station includes a signal communication circuit to communicate with subsidiary stations at a first or second transmission speed and a controller to measure a transmission distance or a transmission time between the main station and each subsidiary station. Based on a result of the measurement, the controller selects a transmission speed for communication with the subsidiary station.

Abstract: An optical transmission apparatus includes redundant line cards each installed with hardware and a CPU. The hardware obtains failure information on redundant lines including a working line and a protection line, and the CPU determines switching control of the redundant lines based on the obtained failure information. Further, the hardware switches the redundant lines based on switching control determined by the CPU, so as to transmit an SDH/SONET optical signal. In the apparatus, from or to hardware installed in each of the redundant line cards, the failure information obtained by the hardware is communicated to hardware installed in a neighboring line card.

Abstract: An optical transmission apparatus includes redundant line cards each having a plurality of ports, a hardware unit and a CPU. The hardware unit obtains failure information on redundant lines for each port. The CPU determines switching control of the redundant lines based on the failure information. Then, the hardware unit switches the redundant lines based on the switching control determined by the CPU, so as to transmit an SDH/SONET optical signal in a ring network. The CPU of one of the line cards is set as a master CPU on the corresponding line card to control switching of the redundant lines. Further, the CPU of the other line card is set as a slave CPU.

Abstract: The present invention relates to a variable length private key generator. According to one embodiment, the variable length private key generator includes a permuter. The permuter is configured to generate a key stream of a desired length by permuting a plurality of shift registers. The permuter includes the plurality of shift registers, a plurality of clocking modules, and/or an output module. Each clocking module corresponds to a different one of the plurality of shift registers and is configured to generate a clocking signal based on selected bits of the corresponding shift register. The output module is configured to output the key stream based on at least one clocking signal and output of at least one of the plurality of shift registers.

Abstract: One embodiment of the disclosures made herein is a method for activating services in a Passive Optical Networking (PON) system. In accordance with such an embodiment, an Optical Line Terminal (OLT) within the PON system is pre-provisioned with PON services and with at least a portion of information required for facilitating automatic activation of the PON services. Pre-provisioning is defined herein to mean that such provisioning is performed prior to installing an ONT (i.e., a network interface device) that will serve such to services at the service subscriber's site and that is controlled by the OLT. After installation of the ONT is complete, the PON services served by the ONT are automatically activated using at least a portion of the pre-provisioned information and information discovered about the ONT during a post-installation discovery process.

Abstract: An OLT in a WDM-PON may include a main board and a sub board. The main board may include a master optical transmitting/receiving control/supervising section and the sub board may include a plurality of optical transceivers and a slave optical transmitting/receiving control/supervising section. The master optical transmitting/receiving control/supervising section may produce a data input signal and a data read-control signal for controlling the plurality of optical transceivers of the sub board. The slave optical transmitting/receiving control/supervising section may receive the data input signal and the data read-control signal, and read the data input signal in accordance with the read-control signal. The optical transceivers may be controlled based on the data input signal.

Abstract: A method is provided for managing connections in an optical access network. Also provided are a corresponding platform, exchange, network and computer software product. The method manages connections of a plurality of user modules to a plurality of transmission modules of an exchange in an optical access network. The management method includes a dynamic re-arrangement of the connection of at least one of the user modules to at least one of the transmission modules according to at least one predetermined optimization criterion.

Abstract: To provide synchronizing methods, optical switch modules, center devices, remote devices, optical access systems, optical access networks, programs, and recording media in the optical access network which can give the connection start time of the upstream optical switching element of the optical switch module. To the optical switch module, ranging functions are provided and the center device OLU carries out ranging of the optical switch module OSM as is the case of ranging of the remote device ONU. The center device OLU transmits the difference between roundtrip time of the remote device ONU and roundtrip time of optical switch module OSM, which is the result of these rangings, to the optical switch module OSM, and the optical switch module OSM can obtain the contact start time of the upstream optical switching element by calculating the contact start time using the difference.

Abstract: A method and apparatus configured to transmit module data between optic modules over a primary communication channel, such as an optic fiber configured to carry network data or outgoing data. A control center may send the module data, such as any type of DDMI data, over the optic fiber to control one or more aspects of the optic module system. The optic module may also be configured to send module data regarding any aspect of module status or operation, to a control center, via the optic fiber. Use of the primary communication channel, normally reserved for only network data, allow for module to module communication or module to control center communication without need of cumbersome two wire interface or supplement channels. Optic module data communication may occur concurrent with network data transmission. Optic module data back-up may occur via the optic channel to provide rapid re-load of important optic module data.

Abstract: When entering an idling state, a master unit M transmits an optical signal for polling addressed to each slave unit S-1 to S-n. The slave unit S-n located at the lowest rank of a direct chain constituted by S-1 to S-n, when receiving the optical signal for polling for the self unit, responds by transmitting an optical signal representing a phase correction request signal to the other slave units. The slave units S-1 to S-(n?1) respond to the phase correction request signal, and initialize each clock signal to synchronize with the clock signal of the slave unit S-n at the lowest rank.

Abstract: A passive optical network (PON) system which enables plural types of ONUs having different signal transmission speeds to be connected to one OLT. An optical line terminating apparatus (OLT) connected to plural types of ONUs having different signal transmission speeds through an optical distribution network includes an optical transmitter-receiver connected to the optical distribution network, a transmission/reception line interface connected to a wide area network, a downstream frame processing section for converting a packet received by the transmission/reception line interface from the wide area network into a downstream frame containing identification information on a destination ONU in a header, and a downstream transmission controller for modulating the downstream frame at a speed corresponding to a signal transmission speed of the destination ONU and outputting the modulated frame to an electrical/optical converter connected to the optical transmitter-receiver.

Abstract: A symmetrical capacity network may be adapted to accommodate asymmetrical network traffic patterns by deploying Protected Dedicated Wavelengths (PDWs) between one or more head-end nodes and the access nodes on a ring-based topology network. The PDWs include pairs of wavelengths extending in opposite directions around the fibers forming the original ring and terminating at the intended access node. The pairs of wavelengths form unidirectional working and protection paths from the head-end node to the intended access nodes. By deploying the symmetric capacity and asymmetric capacity on the same platform within the head-end node, it is possible to apply policy across the network resources to allow traffic flows to be selectively placed on the most appropriate network resource.

Abstract: A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands.

Abstract: In one embodiment, the present invention includes a network hub having an active optical encoder where the network hub is to generate a plurality of addressed optical data signals, each having a common carrier wavelength and a different address corresponding to a network node coupled to the network hub. Other embodiments are described and claimed.

Abstract: A frequency-agile optical transceiver includes a shared local oscillator (LO), a coherent optical receiver and an optical transmitter. The LO operates to generate a respective LO optical signal having a predetermined LO wavelength. The coherent optical receiver is operatively coupled to the LO, and uses the LO signal to selectively receive traffic of an arbitrary target channel of an inbound broadband optical signal. The optical transmitter is also operatively coupled to the LO, and uses the LO to generate an outbound optical channel signal having a respective outbound channel wavelength corresponding to the LO wavelength.

Abstract: The invention relates to a system for conveying digital signals inside a space vehicle between a transmitter and a receiver. In the invention, the link between the transmitter and the receiver comprises a first portion made of optical fiber and a second portion in which infrared radiation propagates without guidance. A particular application lies in conveying remote control and telemetry signals within a satellite between a control module and a piece of equipment.

Abstract: A host station apparatus (10) generates band allocation information including identifications of slave station apparatuses (20-1 through 200-n) and types of data to be transmitted by the slave station apparatuses and posts the information to the plural slave station apparatuses (20-1 through 20-n). The plural slave station apparatuses (20-1 through 20-n) identify as to whether or not the band allocation information is band allocation information about the data types of the slave station apparatuses respectively, and when the band allocation information is band allocation information about the data types of the slave station apparatuses, they control to transmit data to the host station apparatus (10) according to the data types represented by the band allocation information.

Abstract: A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands.

Abstract: A method of setting up two-way optical communication between a central unit and a remote unit suitable for operating in a given communication mode selected from a plurality of communication modes. A plurality of frame patterns is defined in the central unit, with each frame pattern being appropriate to one of the communication modes. The plurality of frame patterns are sent sequentially until a coherent response is obtained from the remote unit, the communication mode of the remote unit being the mode which corresponds to the frame pattern which gave rise to the coherent response.

Abstract: Optical communication systems include a central station that encodes data transmitted to multiplexing (mux) stations or user stations. The central station also decodes data received from the mux stations or user stations. Encoding and decoding are performed using codes, such as composite codes, that designate sources and destinations for data. The mux stations, user stations, and the central station have address encoders and decoders that use, for example, fiber Bragg gratings to encode or decode optical signals according to a code such as a composite code derived by combining codes from one or more sets of codes. A passive optical network comprises one or more levels of mux stations that use such address decoders and encoders to receive, decode, and encode data for transmission toward a central station or a user station.

Abstract: A fiber optic system for communicating between a central office and a downstream station is described. The central office has a TX unit, an RX unit and a continuous wave (“CW”) laser. Each station has an RX unit and a tunable filter coupling the RX unit to the central office. During downstream transmission, the station's tunable filter is tuned to the central office TX wavelength so that the signal transmitted by the central office will pass through the filter and be received by the station's RX unit. During upstream transmission, the station's tunable filter is selectively tuned to a wavelength different than the CW laser wavelength, allowing selective reflection of light from the CW laser back to the central office. The tunable filter can thus be used to modulate the reflected light to effectively create an upstream transmission from the downstream station to the central office.

Abstract: A system and method of providing multiple simultaneous services to several destinations is disclosed. The system includes a central office providing multiple digital services to several destinations. In addition, the system includes a curbside hub directing signals sent from the central office to the destinations. Each destination also includes a home-side interface unit for receiving and sending signals between the destination and the curbside hub. The curbside hub is located within the vicinity of the destinations. The curbside hub is connected to the central office by a first fiber optic link. Additionally, the curbside hub is connected to each home-side interface unit by a home-side fiber optic link. The curbside hub electrically multiplexes and demultiplexes signals between each home-side interface unit and the curbside hub. The curbside hub also optically multiplexes and demultiplexes signals transferred between the central office and the curbside hub.

Abstract: A return path may include a modem pair that is coupled to existing electrical waveguides in a structure such as a house or office building. Specifically, a first modem of the modem pair may be coupled to a first end of a coaxial cable and to a video service terminal. A second modem of the modem pair may be coupled to a second end of the coaxial cable and a data interface. The first modem can modulate video control return packets onto an RF carrier that is propagated over the coaxial cable to the second modem. The video control return packets can be formatted as Ethernet type packets. The second modem can demodulate the RF carrier to extract the video control return packets and to forward these packets towards a data service hub.

Abstract: A wireless optical communication system can reduce the power consumption needed for light emission by a controlled node and suppress a modulated signal component, other than the modulated signal of input data for transmission, in the modulated signal components carried by the light output of the controlled node. The controlled node includes a transmission device for transmitting input data for transmission by an infrared ray amplitude-modulated by a modulated signal of a first frequency band and a light emission control device for suspending the light emission by the transmission device for a predetermined period based on a data amount of the input data for transmission. The light emission circuit generates a light emission control signal and the transmission device stops or starts the light emission based on the light emission control signal so that the modulated signal component in the second frequency band other than the first frequency band does not exceed a maximum allowable value.

Abstract: An object of the present invention is to provide a bi-directional optical transmission system wherein a single optical fiber is shared by upstream and downstream systems, thereby eliminating the need for providing an additional optical fiber and reducing the number of maintenance operations. A master station 400 for outputting a downstream optical signal is connected via an optical transmission path 200 to slave stations 500a-500c each for outputting an upstream optical signal. The optical transmission path 200 includes a single optical fiber connecting at one end to the master station 400, and optical branching units 202a, 202b branching the single optical fiber for connection to the slave stations. The master station 400 includes an optical passive unit 405 which supplies an upstream optical signal coming through the single optical fiber only to an optical-electrical converter 404 and supplies a downstream optical signal output from an electrical-optical converter 403 only to the single optical fiber.