摘要:
An assembly for an optical home network includes a socket having input and output optical fibers, for transmitting optical signals, installed at corresponding positions of both sides of a connection hole. The assembly further includes a plug connected to a device and including input and output optical transmission lines respectively connected to the input and output optical fibers when the plug is inserted into the connection hole of the socket so as to be connected to the socket. The optical signals transmitted through the input and output optical fibers pass through the socket when the plug is not connected to the passive socket, and are transmitted to the device through the plug when the plug is connected to the socket.
摘要:
An assembly for an optical home network includes a socket having input and output optical fibers, for transmitting optical signals, installed at corresponding positions of both sides of a connection hole. The assembly further includes a plug connected to a device and including input and output optical transmission lines respectively connected to the input and output optical fibers when the plug is inserted into the connection hole of the socket so as to be connected to the socket. The optical signals transmitted through the input and output optical fibers pass through the socket when the plug is not connected to the passive socket, and are transmitted to the device through the plug when the plug is connected to the socket.
摘要:
An IEEE 1394-based unidirectional ring system for an indoor backbone network is disclosed. In the ring system, an RG is used for connection to an external large-capacity network, and an SG is connected to the RG. The SG functions as a clock master to synchronize whole clock signals in the system, manages traffic in the indoor backbone network, manages buses in the indoor backbone network, and monitors the physical states of transmission lines in indoor backbone network. The SG and the SPs form a unidirectional ring structure. A plurality of SPs is configured to load the user data over the indoor backbone network or extract user-desired data from the indoor backbone network to provide user-desired services to a user.
摘要:
An IEEE 1394-based unidirectional ring system for an indoor backbone network is disclosed. In the ring system, an RG is used for connection to an external large-capacity network, and an SG is connected to the RG. The SG functions as a clock master to synchronize whole clock signals in the system, manages traffic in the indoor backbone network, manages buses in the indoor backbone network, and monitors the physical states of transmission lines in indoor backbone network. The SG and the SPs form a unidirectional ring structure. A plurality of SPs is configured to load the user data over the indoor backbone network or extract user-desired data from the indoor backbone network to provide user-desired services to a user.
摘要:
A network service platform apparatus employing an IEEE 1394 protocol is disclosed. The network service platform apparatus includes a first optical transceiver connected to an external service gateway to receive downstream data from the external service gateway and transfer upstream data to the external service gateway, a first IEEE 1394 physical unit connected to the first optical transceiver to perform a physical layer operation of an IEEE 1394 protocol with respect to the downstream data, and to transfer the upstream data to the first optical transceiver, and an IEEE 1394 link unit connected to the first IEEE 1394 physical unit to deliver isochronous data of the downstream data by performing a link layer operation of the IEEE 1394 protocol, and to send asynchronous data to be delivered to the service gate to the first IEEE 1394 physical unit as upstream data by performing the link layer operation of the IEEE 1394 protocol with respect to the asynchronous data. In addition, the home network service platform apparatus includes an Application Protocol Interface connected to the IEEE 1394 link unit to output IEEE 1394 isochronous data, an IEEE 1394 bridge unit having a first bus connected to the first IEEE 1394 physical unit and a second bus connected to the first IEEE 1394 physical unit in order to transmit/receive data between the first bus and the second bus, and a second IEEE 1394 physical unit which is connected to the IEEE 1394 bridge unit through the second bus and connected to an IEEE 1394 unit using a bus independent of the IEEE 1394 apparatus.
摘要:
A connector assembly for coupling a corrosive gas supply pipe with a glass tube in an apparatus for fabricating an optical fiber preform using vapor deposition is disclosed. The connector assembly includes a first connector formed on an inner periphery thereof with a threaded portion, a second connector having a stepped surface on an inner surface and formed on an outer periphery with a threaded portion threadedly engaged with the first connector, an O-ring installed in the first connector and in close contact with the stepped surface when the second connector is threadedly engaged with the first connector, and resilient means for urging the O-ring against the stepped surface. The connector assembly consistently applies a resilient force to the O-ring functioning as a seal between the first and second connectors. For a long-running operation, even though the O-ring is cured, the fitting maintains a consistent sealing state to prevent metal material from being oxidized by the corrosive gas. As a result, fine oxidized metal particulars do not infiltrate into the gas supply pipe to prevent the optical fiber preform from deteriorating.
摘要:
A high-speed wireless LAN system is disclosed. The system includes a mobile station for transmitting/receiving data encrypted by a predetermined encryption method, communicating the data to associated access points by an ultra wide-band (UWB) communication method, and communicating an encryption key according to the encryption method to said associated access points by an optical or infra-red (IR) communication method; the plurality of access points, installed in a plurality of predetermined service areas, for relaying between the mobile station and a gateway of a remote place by communicating the data and the encryption key with the mobile station located in the corresponding service area by the UWB and the optical or IR communication methods and transmitting/receiving the data and the encryption key to/from the gateway by an optical communication method; and the gateway for providing an optical interface between an internal network and an external network, being provided with a plurality of gateway sub-modules for transmitting/receiving the data and the encryption key by communicating with the plurality of access points by the optical communication method, and transmitting a subscriber service transmitted from the external network to the corresponding access point.
摘要:
A high-speed wireless LAN system is disclosed. The system includes a mobile station for transmitting/receiving data encrypted by a predetermined encryption method, communicating the data to associated access points by an ultra wide-band (UWB) communication method, and communicating an encryption key according to the encryption method to said associated access points by an optical or infra-red (IR) communication method; the plurality of access points, installed in a plurality of predetermined service areas, for relaying between the mobile station and a gateway of a remote place by communicating the data and the encryption key with the mobile station located in the corresponding service area by the UWB and the optical or IR communication methods and transmitting/receiving the data and the encryption key to/from the gateway by an optical communication method; and the gateway for providing an optical interface between an internal network and an external network, being provided with a plurality of gateway sub-modules for transmitting/receiving the data and the encryption key by communicating with the plurality of access points by the optical communication method, and transmitting a subscriber service transmitted from the external network to the corresponding access point.
摘要:
A GE-PON (Gigabit Ethernet Passive Optical Network) system and media access control method for the same are disclosed. In the GE-PON system, by employing MAC attributes of the gigabit Ethernet frames, an OLT (Optical Line Termination) transmits a downstream window containing both a control frame having timeslot position and size information in association with at least two ONUs and Ethernet frames to an ODN (Optical Distribution Network). The OLT analyzes contents of RAUs in an upstream window transmitted from the ONUs in a TDMA method and received from the ODN, and permits timeslot position and size corresponding to each of the ONUs. A plurality of ONUs, connected to the ODN, have their respective timeslot position and size allocated in response to their respective information contained in the control frame of the downstream window. RAU frames are transmitted having queue information and Ethernet frames associated with the allocated timeslots. As a result, by the above MAC structure of the GE-PON system, the OLT can be quickly intercommunicated with a plurality of ONUs.
摘要翻译:公开了一种GE-PON(千兆以太网无源光网络)系统及其媒体访问控制方法。 在GE-PON系统中,通过采用千兆比特以太网帧的MAC属性,OLT(Optical Line Termination,光线路终端)将包含具有时隙位置的控制帧和与至少两个ONU和以太网帧相关的大小信息的下游窗口发送到 ODN(光分配网络)。 OLT以TDMA方式从ONU发送的上行窗口中的RAU的内容进行分析,并从ODN接收,并且允许与每个ONU对应的时隙位置和大小。 连接到ODN的多个ONU具有响应于其包含在下游窗口的控制帧中的它们各自的信息而分配的各自的时隙位置和大小。 发送具有与分配的时隙相关联的队列信息和以太网帧的RAU帧。 结果,通过GE-PON系统的上述MAC结构,OLT可以与多个ONU快速相互通信。
摘要:
This invention provides a gain control device and method for an erbium doped fiber amplifier that is capable of maintaining a constant gain irrespective of the intensity variation of the input signal light. The gain control device includes: a pumping light source for outputting pumping light adapted to excite erbium ions for the amplification of an input optical signal while outputting a pumping light sensing signal indicative of the power of the pumping light; a photo-detecting unit for outputting an input light sensing signal indicative of the power of the input optical signal; a control unit for reading out from a look-up table a reference power corresponding to the optical signal power indicated by the input light sensing signal and outputting a reference signal indicative of the read-out reference power; an automatic gain control circuit for conducting a comparison between the reference power and the pumping light power based on the pumping light sensing signal and the reference signal, and for outputting a power compensating signal adapted to compensate for the difference between the reference power and the pumping light power; and, a pumping light source driving unit for controlling the level of a bias current supplied to the pumping light source based on the power compensating signal.