56 results about "Fiber to the x" patented technology

Disclosed is an improved optical fiber that employs a novel coating system. When combined with a bend-insensitive glass fiber, the novel coating system according to the present invention yields an optical fiber having exceptionally low losses.

The coating system features (i) a softer primary coating with excellent low-temperature characteristics to protect against microbending in any environment and in the toughest physical situations and, optionally, (ii) a colored secondary coating possessing enhanced color strength and vividness. The secondary coating provides improved ribbon characteristics for structures that are robust, yet easily entered (i.e., separated and stripped).

The optional dual coating is specifically balanced for superior heat stripping in fiber ribbons, with virtually no residue left behind on the glass. This facilitates fast splicing and terminations. The improved coating system provides optical fibers that offer significant advantages for deployment in most, if not all, fiber-to-the-premises (FTTx) systems.

A modular Cable Modem Termination System (CMTS) includes a packet shelf operating a Data Over Cable Service Interface Specifications (DOCSIS) Media Access Control (MAC) framer. One or more downstream Physical Interface (PHY) shelves receive DOCSIS data from the packet shelf over a packet switched network and modulate the DOCSIS data for sending on a downstream path of a cable plant. One or more upstream PHY shelves send DOCSIS data received from an upstream path of the cable plant over the packet switched network to the packet shelf. By separating the PHY components from the MAC and from the system software, the PHY components for a Hybrid Fiber Coax (HFC) plant may be replaced with different PHY components for other access technologies such as wireless, Digital Subscriber Lines (DSL), Ethernet-to-the-Home, Fiber-to-the-Home, or fiber Passive Optical Networks (PONs).

A fiber to the home (FTTH) system based on a passive optical network (PON) includes an optical line terminal (OLT) block, an optical network terminal (ONT) block, and an optical distribution network (ODN). The ONT block includes a video-optical line terminal (V-OLT) and an optical line terminal (OLT) in order to output optical signals of the video-optical line terminal (V-OLT) and the optical line terminal (OLT) by multiplexing the optical signals. The VOLT receives cable TV, master antenna TV, and satellite broadcasting optical signals inputted from a broadcasting service network so as to output received signals as a first optical signal having a predetermined wavelength band. The OLT includes a first downstream data optical transmitter and a first upstream data optical receiver and outputs a data communication signal inputted from a data service network as a second optical signal having different wavelength from the video-optical line terminal. The ONT block includes a video-optical network terminal (V-ONT) and an optical network terminal (ONT) in order to split multiplexed data communication signals, and cable TV broadcasting, master antenna TV broadcasting, and satellite broadcasting optical signals. The V-ONT processes the split cable TV broadcasting, master antenna TV and satellite broadcasting optical signals so as to provide subscribers with the split cable TV broadcasting, master antenna TV and satellite broadcasting optical signals. The optical network terminal (ONT) has an upstream data optical transmitter and a downstream data optical receiver so as to process split data communication signals. The optical distribution network (ODN) connects the optical line terminal block to the optical network terminal as an optical transmission medium.

The subscriber end of a network, such as a Fiber-To-The-Home (FTTH) network, utilizes a pair of wires to provide both power source (battery) status information and operating power over the pair of wires by superimposing tones, which indicate the status of the battery, onto a DC voltage on the pair of wires.

Disclosed is an optical access passive network supportive of quantum communication. The network is supportive of bidirectional data communication of a GPON (gigabit passive optical network) accordant with the ITU (International Telecommunication Union)-T G.984 standard or an EPON (Ethernet passive optical network) accordant with the IEEE802.3 (Institute of Electrical and Electronics Engineers) standard and quantum key distribution (QKD) of uplink direction. An improved optical network unit is adopted in the network to add a QKD emitter and an alternating time-division multiple-address access control module on a basis of an original GPON or EPON, an improved optical line terminal is adopted to add a QKD receiver and a clock extraction module on a basis of the original GPON or EPON, and an improved passive optical splitter is adopted and comprises two 1: N optical splitters and N Bragg gratings (N is the number of the optical network unit). The network integrally greatly avoids inferences, on quantum signals, of high-light signals to enable the QKD to be capable of coexisting with the GPON or EPON. The optical access passive network supportive of quantum communication can thoroughly improve potential security loopholes of common optical access networks and provides a feasible scheme for popularizing the quantum communication technology to a fiber to house (building) FTTx (fiber to the x) access network.

A technique for installing a fiber optic network includes preparing a physical site to install a feeder cable and a plurality of access stub lines along a plurality of customer premises that potentially may connect to the feeder cable to obtain communication services. Each of the access stub lines extends from the feeder cable towards a customer premise and each ends at a different initial termination point. There is a one-to-one correspondence between the customer premises and the access stub lines extending from the feeder cable. A demarcation device is attached to an end of each of the access stub lines at each of the initial termination points. The demarcation device includes an optical reflector that is reflective to an optical test signal for testing integrity of the feeder cable and an associated one of the access stub lines.

The invention relates to a method for realizing link discovery and management in an FTTX (Fiber to the X) access system. The method comprises the steps of: periodically sending link layer discovery protocol messages to an uplink device of an OLT (Optical Line Terminal) device through an uplink interface by the OLT device; performing a listening task by a core swap disk program of the OLT, wherein the link layer discovery protocol messages from an ONU (Optical Network Unit) and an ONU user-side access device are received in the listening task; respectively storing locally stored information of the device and information of a user-side network device into a local link layer discovery protocol management information base by the OLT device; requiring to send LLDPDU (Link Layer Discovery Protocol Data Unit) protocol messages to the uplink device by the OLT so as to report the existence of the OLT; and carrying out extension of the LLDPDU messages. The invention fills in the gap of application of the traditional link layer discovery protocol (LLDP) and provides the method for realizing link layer discovery in the FTTX access system with optical path grading, especially on a plug-in card type OLT device; and according to the method, provided by the invention, the basic architecture of the FTTX access system is not affected, and the operation is simple and easy to realize.

The invention relates to a photonic crystal triple wavelength division multiplexer based on the application of FTTH (fiber to the home). The division multiplexer adopts the two-dimensional photonic crystal with hexagonal lattice air holes on a high refractivity flat plate. The photonic crystal triple wavelength division multiplexer contains four photonic crystal line-defect waveguides and two photonic crystal point-defect micro-cavities, wherein the four photonic crystal line-defect waveguides are an input waveguide, a first channel, a second channel and a third channel respectively; the two defect micro-cavities are a downlink micro-cavity with the wavelength of 1490nm and a downlink micro-cavity with the wavelength of 1310nm; the two micro-cavities are placed on both sides of the input waveguide; and the second channel and the third channel are separately connected with the 1310nm of downlink micro-cavity and the 1490nm of downlink micro-cavity, and the tail end of the input waveguide is connected with the first channel through a folding directional coupler. The invention is convenient to prepare, has high practicability and micron dimension and can be applied in the FTTH access network.

The invention relates to a light and fiber splitting box of optical divider slot, which comprises a box cover and a box body; a bottom plate is disposed at the bottom layer of the box body; four sides of the bottom plate are provided with a butterfly-shaped optical cable clamp, a supporting rack, a winding ring and a magnetic absorption column; a pulled fiber fixing plate is disposed in the middle of the bottom plate; a ground bolt and a plastic clamping piece are disposed between the pulled fiber fixing plate and a moving block of a lower side plate of the box body; a fiber melting plate is fixedly connected to the pulled fiber fixing plate; a turning plate is disposed on the fiber melting plate; an optical divider bracket is disposed on the turning plate; the bracket is provided with four 1*8, or two 1*16, or one 1*32, or two 1*8 and one 1*16 optical dividers for connecting upstream formed tail fibers with downstream formed butterfly-shaped tail fibers. The advantages are that: an outdoor optical fiber can be stripped and is directly wound on the pulled fiber fixing plate directly without being cut off to form a loop, and the outdoor optical fiber is still itself outside; and a central tube bundle fiber passing by a way can be used for erecting next optical fiber, so that the optical fiber is favorably popularized and applied to life of the people.

A network device with an uninterruptible power supply function is provided. The network device includes a network physical transmission unit, a power connecting part and a backup power supply module. The network physical transmission unit is operated at a user terminal according to a fiber to the home (FTTH) technology or a fiber to the building (FTTB) technology. The power connecting part is in communication with an external power source for receiving electricity from the external power source to operate the network device. If the electricity transmitted from the external power source to the network device is interrupted, the backup power supply provides backup electricity to the network device to maintain normal operation of the network device.

The invention relates to an optical fiber used in an outdoor system and an indoor system of a fiber-to-the-x (FTTx) network project in a communication network, fiber reinforced plastics used by the optical cable and a preparation method of the fiber reinforced plastics. As for the optical cable, at least one optical fiber is coated with a reinforced sheath which is the fiber reinforced plastics and is externally coated with a protecting jacket. The fiber reinforced plastics comprise the following components in parts by weight: 13-25 parts of light-cured resin and 75-87 parts of fiber yarn. The preparation method of the fiber reinforced plastics has the following steps: a, placing the light-cured resin in a constant temperature cabinet at the temperature of 70-90 DEG C for 1-2h; b, placing the light-cured resin and the fibre yarn in a solution tank for evenly mixing; c, pulling and extruding into a formed rod piece by a pultrusion module; and d, placing the formed rod piece in an ultraviolet curing oven for curing for 0.3-12s. The invention improves the safety protection performance of communication facilities and user terminal equipment; and the optical cable with fine diameter and small radium of curvature can satisfy the special requirements of easy branching, easy access and convenient construction in the FTTx network project.

The invention relates to a butterfly-shaped optical cable jump fiber. Two ends of a single-core butterfly-shaped optical cable are provided with connectors with the same structure. Each connector is structurally characterized in that the single-core butterfly-shaped optical cable is connected with a back end of a metal tail handle, and the front end of the metal tail handle is connected with the back end of a ceramic insertion core after being sleeved with an SC (square connector) main body and a spring; an optical fiber fibril and a blue core wire which are covered by a stiffener penetrate through a centre hole of the metal tail handle, the optical fiber fibril is connected with the ceramic insertion core; a joint of the single-core butterfly-shaped optical cable and the metal tail handle is in protective fixed connection by an aluminum riveting component, and the joint is sleeved with a plastic sheath; the SC main body is connected with the back end of a plastic inner frame in an embedding mode, so that a connection head which consists of the ceramic insertion core, the metal tail handle, the aluminum riveting component and the single-core butterfly-shaped optical cable is movable relative to the plastic inner frame. The butterfly-shaped optical cable jump fiber disclosed by the invention has the advantages that a hard optical fiber is used as the jump fiber, the optical fiber fibril is protected more effectively, threading and connection are convenient, bending is not overlarge, signals can not be attenuated, and a ready-mad jump fiber is provided for the last section of FTTH (fiber to the home).

A fiber-to-the-home (FTTH) system transmits forward and reverse optical signals, such as video, voice, and data signals, via optical fiber, and includes a plurality of home network units. The home network units include an optical receiver for receiving at least one of the video, voice, and data signals. Included is a plurality of gain stages that are distributed throughout the optical receiver. The gain stages include a preamplifier stage, two interstage amplifiers, and a postamplifier stage. Two gain control circuits automatically adjust the gain of the video signal based upon the input power level to the FTTH optical receiver. Additionally, a tilt network performs level compensation for externally located coaxial cable. A signal is then provided to a device located within a home via the coaxial cable at the proper RF level having low noise signals.

A TDM (Time Division Multiplexing) frame applicable to digital broadcast data transmission in an FTTH (Fiber To The Home) system and a method for transmitting and receiving the TDM frame is disclosed. The TDM frame and methods are applicable to transmit a plurality of digital broadcast data units having different synchronous clocks using a simple format. The TDM frame for multiplexing digital broadcast and communication signals having different synchronous signals in a broadcast/communication convergence system using an FTTH system comprises a framing bit field for identifying a start and end of the TDM frame seamlessly provided; two MPTS (Multiple-Program Transport Stream) fields respectively having at least one bit assigned for digital broadcast data transmission wherein an amount of input digital broadcast data is adjusted according to a difference between a multiplexing rate and an input rate associated with the digital broadcast data in the digital broadcast data transmission; and a fast Ethernet field having at least one bit assigned for communication data transmission.

The invention provides a method and device for controlling fiber to the building (FTTB) to be fiber to the home (FTTH), a fiber to the building (FTTB) optical network comprises an optical line terminal (OLT), an optical distribution network (ODN), an optical network unit (ONU) and terminal equipment; the optical distribution network (ODN) comprises a last-stage optical splitter and a secondary optical splitter. The method comprises the following steps: acquiring the number of optical fibers in an optical cable for connecting a last-stage optical splitter of an optical distribution network (ODN) with an optical network unit (ONU) and the number of terminal equipment; and generating a control signal according to the number of the optical fibers and the number of the terminal devices, wherein the control signal is used for controlling whether to access the secondary optical splitter to the FTTB optical network. The control signal is generated according to the number of the optical fibers and the number of the terminal devices, the transformation strategy of the FTTB optical network is reasonably controlled, the user experience is improved on the Internet surfing rate, the operation cost of an operator is reduced, and the working efficiency of workers is improved.

The invention relates to a high-hardness central-tube-strengthened ratproof optical cable. The high-hardness central-tube-strengthened ratproof optical cable comprises a plurality of optical fibers, a glass fiber yarn and an outer sheath sequentially from inside to outside. A central tube sleeves the optical fibers and is filled with water resistant materials, the glass fiber yarn is uniformly arranged on the outer circumference of the central tube, and the outer sheath which is a high-hardness low-smoke halogen-free flame retardant polyolefin sheath is arranged outside the glass fiber yarn. The high-hardness central-tube-strengthened ratproof optical cable has the advantages that the glass fiber yarn serves as a strengthening part of the optical cable; by means of adopting the central tube structure, arranging the high-density glass fiber yarn outside the central tube and then manufacturing the high-hardness low-smoke halogen-free flame retardant polyolefin sheath layer by extruding, requirements of indoor wiring and outdoor wiring can be met; a novel structural design and technical control are adopted, so that the problem of excess length of an inner tightening sleeve of the central tube is solved, the problems of thick external diameter, high dead weight, inconvenience in construction and the like of the optical cable can be also solved, and accordingly a brand new optical fiber is provided for FTTx (fiber-to-the-x) construction of our country.