Abstract:
Provided is an optical transmitting and receiving system. The optical transmitting and receiving system may include: a Main Hub Unit (MHU) configured to perform wavelength division multiplexing on a plurality of downlink signals using a plurality of wavelengths and transmit the multiplexed downlink signal through a first optical cable; a first Remote Optical Unit (ROU) configured to perform demultiplexing on the multiplexed downlink signal received from the MHU and output a part of the plurality of downlink signals; and a second ROU configured to perform demultiplexing on the multiplexed downlink signal and output other part of the plurality of downlink signals.
Abstract:
A software-defined networking (SDN) method. The SDN method according to an exemplary embodiment may be used in managing and operating SDN-based network resources in an optical communications network, a fixed mobile convergence subscriber network, a wired broadband subscriber network, a distributed mobile communications base station network, etc.
Abstract:
Provided herein is a method for realizing time reduction in shared mesh protection, the method including, in a protection path node, in response to a resource being used for a first protection path by a node, receiving a resource use request for setting a second protection path from another node; activating a protection switch through comparison of priorities of protection paths at the resource use request received; and transmitting, by the activation of a protection switch, to a next protection path node a first shared mesh protection message where a revert (RT) message for the first protection path and a protection switch (SF) message for setting a second protection path are multiplexed.
Abstract:
A transmission performance monitoring method for monitoring a transmission performance based on an analog optical link and an apparatus performing the method. The transmission performance monitoring method and apparatus centrally monitor an RF signal transmission performance in an analog optical link-based mobile haul or indoor distributed antenna system.
Abstract:
A method and apparatus for adjusting a modulation index of an analog optical signal using an interference phenomenon of a coherent light, the method including dividing an analog optical signal for a first path and a second path, extracting an optical carrier from an analog optical signal divided for the first path, controlling an intensity and a phase of the optical carrier, and controlling a modulation index of the analog optical signal by combining an analog optical signal divided for the second path and the optical carrier of which the intensity and the phase are controlled.
Abstract:
An optical signal transmission system and method of allocating center frequencies of intermediate frequency (IF) carriers in a frequency division multiplexing (FDM) optical fiber link. The optical signal transmission method includes determining a center frequency interval between modulated signals based on a bandwidth of the modulated signals or a center frequency of a modulated signal having a lowest center frequency, among the modulated signals, reallocating center frequencies to the modulated signals based on the center frequency interval between the modulated signals, and converting the modulated signals reallocated the center frequencies from electrical signal into optical signal and transmitting the optical signal.
Abstract:
An optical coupling apparatus includes a shell in which a sleeve that guides optical coupling is inserted; a ferrule into which an optical fiber collimator stub is inserted, wherein the optical fiber collimator stub is integrated into one with an optical fiber inserted inside the sleeve and converts an optical signal into a collimated beam; and a housing that surrounds the ferrule.
Abstract:
A method for providing a protection switching service in a virtual tenant network (VTN) and a controller are provided. The method enables a real-time protection switching setup on a VTN path in order to provide reliability of a VTN service.
Abstract:
Provided herein is a link management method and apparatus in a multi-layered network, the method including confirming whether or not set virtual TE link resources can be committed to a virtual TE (traffic engineering) link; in response to the set virtual TE link resources being committable to the virtual TE link, committing the resources to the virtual TE link through resource commitment; in response to the set virtual TE link resources being not committable to the virtual TE link, determining whether or not the virtual TE link is an adaptive virtual TE link; and in response to the virtual TE link being determined as the adaptive virtual TE link and the adaptive bandwidth satisfying TE link setting standards, committing the resources to the virtual TE link.
Abstract:
Provided is a method and apparatus for managing resources of a transport network, the method including monitoring a fault occurring in a transfer path, and registering, when the fault occurs in the transfer path, a normal link of a second layer assigned to an operation path of a first layer in which the fault occurs.