Entries |
Document | Title | Date |
20100158524 | UPSTREAM SOURCE LIGHT GENERATOR OF PASSIVE OPTICAL NETWORK SYSTEM AND METHOD OF GENERATING UPSTREAM SOURCE LIGHT - Provided is an upstream source light generator of a passive optical network (PON) system. The upstream source light generator includes an amplification part configured to amplify injection light, and a reflection part configured to receive the amplified injection light and generate reflection light by reflecting the amplified injection light with different optical delays according to wavelengths of the amplified injection light. | 06-24-2010 |
20100239258 | OPTICAL PON NETWORK USING PASSIVE DPSK DEMODULATION - An optical PON network comprises a central office which generates N DPSK modulated optical signals, where N is an integer greater than 1, an optical coupling which connects the N signals to at least one optical fibre, a passive distribution mode located remotely from the central office which has at least one input port that is coupled to the fibre and a plurality of output node being arranged to transmit a first wavelength of the N signals to at least one of its output ports, and at least one optical network unit connected through a respective optical fibre to the first output port of the passive distribution node. The passive distribution node comprises an arrayed waveguide grating which provides a passive optical connection between its input port and the first output port and which for that connection functions as a bandpass filter having a profile and bandwidth selected such that the DPSK optical signal passed to the input node is converted to an intensity modulated signal at the output port. | 09-23-2010 |
20110008047 | DEVICE AND A METHOD FOR MANAGING THE TRANSMISSION POWER OF AN OPTICAL SOURCE ACCORDING TO THE LEVEL OF OPTICAL LOSSES OF AN OPTICAL LINK - A device and method are provided for transmitting an optical signal including at least two optical components to be transmitted respectively through at least two optical links that can be established respectively between the transmission device and at least two terminal devices. The transmission device and method associate, based on at least one parameter representative of the optical losses of the optical links, at least one of the optical components to at least one optical link selected from the optical links and to a transmission optical power. | 01-13-2011 |
20110026922 | Optical fiber network with improved fiber utilization - A passive optical network system and method in which at least part of the data is optically transmitted through a single optical fiber using a wavelength division multiplexing technique, with a plurality of signals being carried through the fiber in each direction, a different wavelength being used for each of the multiplexed upstream and downstream signals. The system may be retrofitted into existing telecommunications system to provide a multi-fold increase in the available bandwidth of long-distance optical fiber transmission. | 02-03-2011 |
20110222854 | COHERENT OPTICAL HUBBING - An optical communications system includes a hub modem and a set of two or more remote modems. Each remote modem includes a transmitter stage for transmitting a respective uplink data stream within a selected one of a set of two or more sub-channels. The hub modem optically communicates with the set of remote modems. The hub modem includes a receiver stage having an optical front-end for receiving an uplink optical channel signal within a spectral range that encompasses the set of two or more spectral sub-bands; a photodetector for detecting modulation components of the received uplink optical channel signal and for generating a corresponding high bandwidth analog signal; and a digital signal processor for processing the high bandwidth analog signal to recover the respective uplink data stream transmitted by each remote modem. | 09-15-2011 |
20120201542 | METHOD AND DEVICE FOR FIBER ACCESS PHYSICAL LAYER UNBUNDLING USING MULTIPLE UPLINK CARDS - A system, an unbundling optical line terminal (OLT), and a method are described herein that allow at least two service providers (SPs) to use individual fibers of an optical distribution network (ODN). In one embodiment, the unbundling OLT includes one or more wavelength division multiplexing-passive optical network (WDM-PON) line cards and one or more SP uplink cards that enable multiple SPs to each utilize one uplink port to access individual wavelengths of one or more passive optical networks (PONs). In another embodiment, the unbundling OLT includes one or more point-to-point line (p2p) line cards (e.g., p2p fiber Ethernet line cards) and one or more SP uplink cards that enable multiple SPs to each utilize one uplink port to access one or more individual fibers. | 08-09-2012 |
20130064545 | Point-to-Multipoint Simultaneous Optical Transmission System - A point-to-multipoint optical communication network includes a fiber optic cable, and a single photodiode for optical/electrical conversion at the upstream end of the cable. On the other hand, an “n” number of electrical/optical up-converters are connected between an “n” number of downstream points and the downstream end of the cable. Within this arrangement, radio frequency signals “f | 03-14-2013 |
20140161455 | TEMPERATURE CONTROLLED MULTI-CHANNEL TRANSMITTER OPTICAL SUBASSEMBLY AND OPTICAL TRANSCEIVER MODULE INCLUDING SAME - A temperature controlled multi-channel transmitter optical subassembly (TOSA) may be used in a multi-channel optical transceiver. The multi-channel TOSA generally includes an array of lasers optically coupled to an arrayed waveguide grating (AWG) to combine multiple optical signals at different channel wavelengths. A temperature control system may be used to control the temperature of both the array of lasers and the AWG with the same temperature control device, e.g., a thermoelectric cooler (TEC). The multi-channel optical transceiver may also include a multi-channel receiver optical subassembly (ROSA). The optical transceiver may be used in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON). | 06-12-2014 |
20140241726 | TEMPERATURE CONTROLLED MULTI-CHANNEL TRANSMITTER OPTICAL SUBASSEMBLY AND OPTICAL TRANSCEIVER MODULE INCLUDING SAME - A temperature controlled multi-channel transmitter optical subassembly (TOSA) may be used in a multi-channel optical transceiver. The temperature controlled multi-channel TOSA generally includes an array of lasers optically coupled to an optical multiplexer, such as an arrayed waveguide grating (AWG), to combine multiple optical signals at different channel wavelengths. The lasers may be thermally tuned to the channel wavelengths by establishing a global temperature for the array of lasers and separately raising local temperatures of individual lasers in response to monitored wavelengths associated with the lasers. A temperature control device, such as a TEC cooler coupled to the laser array, may provide the global temperature and individual heaters, such as resistors adjacent respective lasers, may provide the local temperatures. The optical transceiver may be used in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON). | 08-28-2014 |
20140294392 | HIGH-THROUGHPUT ROUTING IN AN OPTICAL NETWORK HAVING A MESH TOPOLOGY - An optical routing scheme in which an optical network having a mesh topology is configured to route optical packets through an optical routing layout superimposable with the mesh topology, but having a star-like topology. Using this routing layout, the optical network can be configured to transport optical packets from respective ingress nodes, through the hub node located at the star center, to respective egress nodes in a manner that enables a data throughput that approaches the theoretical capacity. No special hardware is required for implementing the hub functionality, and any node of the optical network can be configured to serve as the hub node. The latter feature enables relatively straightforward optimization of the optical routing layout and transmission schedule, e.g., by changing the identity of the hub node and adjusting the transmission schedule at the ingress nodes to synchronize packet arrivals to the hub node. | 10-02-2014 |
20150131998 | TELECOMMUNICATIONS MODULE - A cable boot is mounted to a telecommunications module housing an optical component, wherein the cable boot extends outwardly from the module. The cable boot is mounted by axially passing the cable boot over a plurality of cables carrying fiber optic signals leading to the optical component, axially passing a portion of the cable boot through a cutout defined on a main housing of the telecommunications module, placing a boot retainer over the boot in a direction transverse to the axial direction to capture the flexible boot against movement both in the axial direction and the transverse direction, and mounting a cover on the main housing to capture the boot retainer against the main housing. | 05-14-2015 |
20150295653 | OPTICAL COMMUNICATION SYSTEMS AND METHODS - Systems and methods presented herein provide for optical communications. In one embodiment, a communication system includes a plurality of communication nodes and a communication hub. A bundle of optical fibers optically links the nodes to the communication hub. The communication hub includes a laser operable to propagate unmodulated laser light to a first node along a first of the optical fibers in the bundle. The first node is operable to modulate the laser light with a first modulating signal source, and to propagate the modulated laser light to a second node. The second node is communicatively coupled to a second modulating signal source and to the first node. The second node is operable to optically combine upstream communications from the second modulating signal source with the modulated laser light from the first node, and to propagate the modulated laser light with the upstream communications to the communication hub at a same carrier wavelength. | 10-15-2015 |