Abstract: A method for enhancing transmission efficiency of burst data by estimating a void between burst data and filling the void with new burst data in an optical burst switching (OBS) network. To this end, a node in the OBS network receives burst data (BD) aggregated from data packets, and a burst control packet (BCP) that is received prior to the BD by an offset time. The BCP contains information relating to the offset time and the BD. To predict the void between the BDs, a void filling time is defined within the offset time using the BCP. The present invention provides the method for determining whether to fill the void and filling the void by directly monitoring the BD over a preset time.

Abstract: A high-speed wavelength selectable optical source and a method thereof are disclosed. The wavelength selectable optical source includes at least one optical source having a multimode oscillation spectrum, a demultiplexer and an optical switch for extracting light having a certain selected wavelength. A certain wavelength can be selected among the multimode wavelengths using the demultiplexer and the optical switch, and thus the wavelength can discontinuously be tuned at high speed. Also, by making the light having the selected wavelength incident to the multimode optical source, the power of the output light can uniformly be maintained and maximized through injection locking.

Abstract: A demodulation method using phase detection and an apparatus thereof are provided. The demodulation method includes detecting phase information by sampling a received signal, synchronizing at least one clock signal by using the detected phase information, oversampling the received signal by the synchronized clock signal, and demodulating the received signal by using the oversampled result. With this, the demodulating apparatus can demodulate the modulated signal by using the phase detection, and use a digital filter as a filter for removing a jitter from the demodulated signal, thereby allowing a size thereof to be minimized.

Abstract: Apparatuses and methods are provided which suppress a surge component occurring at an optical amplifier on an optical path through which an optical burst signal is transmitted. An optical amplifier may experience a surge due to the power variation of the optical burst signal that is fed to the optical amplifier. To suppress such a surge component, a power corresponding to a number of wavelengths of an optical burst signal to be input is calculated. The optical amplifier is instructed to generate an optical signal with a power corresponding to a difference between a set value and the calculated power. The generated optical signal and the optical burst signal to be input are coupled and output according to the instruction. Thus, the optical amplifier can receive the optical signal with the constant power and the surge component at the optical amplifier can be suppressed.

Abstract: An apparatus and method for effectively transmitting a packet data and a control data of path information about the packet data in an optical packet data switching network. The method includes grouping a plurality of wavelengths into at least two wavelength bandwidths, each wavelength bandwidth being composed of neighboring wavelengths, and transmitting the optical packet data and the control data with wavelengths of different wavelength bandwidths respectively. Since the wavelength to transmit the optical packet data and the wavelength to transmit the control data has a difference from each other, a node receiving optical data easily divides the packet data and the control data.

Abstract: Disclosed is an optical packet communication system using a wavelength-offset polarization-division multiplexing labeling. An optical signal transmitter which is provided at an ingress node positioned at a sending end in an optical packet switching network, generates and combines packet data and a label, and transmits the combined packet data and label to a core node, wherein the packet data and label have polarization directions perpendicular to each other and maintain a predetermined wavelength interval. A label swapping device detects the label from the combined packet data and label received from the optical signal transmitter, detects next moving position information of the packet data, for generating a new label, substitutes the detected label by the new label, combines the new label with the packet data, and transmits the combined packet data and new label to a next moving position.

Abstract: A network bridge apparatus and a communication method using the network bridge apparatus are provided. In the network bridge apparatus, a storage stores first attribute information which is provided by a first device of a first cluster for communication, an external communicator transmits the stored first attribute information to a second cluster and receives second attribute information which is provided by a second device of the second cluster for communication, from the second cluster, and a controller recognizes a service provided by the second device from the received second attribute information, creates a virtual device corresponding to the second device by changing the received second attribute information, and maps the changed second attribute information to the received second attribute information.

Abstract: A communication system for home networking, the home networking communication system including: a plurality of repeaters that are respectively provided in some zones from among a plurality of zones, a splitter that is connected to the plurality of repeaters through a coaxial cable, and a hub that is provided in one zone from among the plurality of zones, is connected to the splitter through the coaxial cable, and relays data communication between the plurality of repeaters. Accordingly, a cost for installation is reproduced and an installation of the communication system is more convenient.

Abstract: A demodulation method using phase detection and an apparatus thereof are provided. The demodulation method includes detecting phase information by sampling a received signal, synchronizing at least one clock signal by using the detected phase information, oversampling the received signal by the synchronized clock signal, and demodulating the received signal by using the oversampled result. With this, the demodulating apparatus can demodulate the modulated signal by using the phase detection, and use a digital filter as a filter for removing a jitter from the demodulated signal, thereby allowing a size thereof to be minimized.

Abstract: A wireless bridging method for a wireless IEEE 1394 network environment includes receiving information about IEEE 1394 devices contained in an external cluster from the external cluster, and if the information on the IEEE 1394 devices contained in the external cluster is received from the external cluster, resetting a bus of a cluster. According to the method, an effective wireless 1394 bridge supporting a conventional 1394 devices having no bridge awareness function can be implemented.

Abstract: A method and an apparatus for transmitting a single-band orthogonal frequency division multiplexing (OFDM)-based ultra wideband (UWB) signal over a pipeline carrying a cable television broadcasting signal. The method includes transforming a multimedia signal transmitted from a multimedia device into a wireline UWB signal; transforming the wireline UWB signal into a single-band OFDM signal; and frequency-spreading the single-band OFDM signal according to a transmission rate. Thus, the apparatus can be robust to multi-path interference and extend transmission distance so as to increase transmission efficiency.

Abstract: A wireline ultra wideband (UWB) signal transmission device, and a wireline ultra wideband signal transmission method of transmitting an ultra wideband signal over a pipeline carrying a cable television (CATV) broadcasting signal. The pipeline includes a plurality of coaxial cables operatively connected through a plurality of splitters that divide the CATV broadcasting signal at a predetermined rate. A plurality of wireline UWB signal transmission devices respectively connected to the pipeline transmit a wireline single band orthogonal frequency division multiplexing (SB-OFDM) based UWB signal through the pipeline and recover a multimedia signal from the SB-OFDM based signal.

Abstract: Disclosed is a wavelength-division-multiplexed (WDM) passive optical network which comprises an optical network unit (ONU) for receiving and transmitting an optical communication service; a remote node having an amplifier for amplifying wavelength of light as being transmitted from the optical network unit; and a central office for receiving the amplified light. In accordance with the WDM passive optical network described herein, it is possible to enhance the quality of the optical communication service provided by the optical network.

Abstract: A time and wavelength division multiplexed passive optical network where a central office has a downstream transmitter and an upstream receiver. The downstream transmitter multiplexes and transmits downstream optical signals in a time region. The upstream receiver de-multiplexes, in a wavelength region, an upstream optical signal. An optical network unit has a downstream receiver and an upstream transmitter, where the downstream receiver de-multiplexes, in the time region, the downstream optical signals from the central office. The upstream transmitter multiplexes the upstream optical signal in the wavelength region and transmits the signal to the central office. A remote node, having an optical distributor and a wavelength division multiplexer, is connected between the central office and the optical network unit. The optical distributor distributes the downstream optical signals from the central office.

Abstract: A wavelength converter for generating a wavelength tunable laser optical source in itself is disclosed. The wavelength converter includes a first semiconductor optical amplifier for generating an optical noise, generating and outputting a first optical source by amplifying the generated optical noise if an external current is applied, first and second distributed Bragg reflectors for reflecting only a component of a specified wavelength range among components of the optical noise and applying the reflected component to the first semiconductor optical amplifier, and a second semiconductor optical amplifier for receiving an optical source divided from the optical source reflected by and outputted from the first distributed Bragg reflector and an input data optical source, generating and outputting a second optical source by changing a phase of the divided optical source according to a digital signal from the input data optical source.

Abstract: An optical signal switching network having a transmitter and a receiver, wherein the transmitter includes a data generator for generating a data signal and a clock signal having the same frequency as the data signal; a clock attenuator for attenuating a frequency of clock signal generated in the data generator at a predetermined ratio; a signal synthesizer for synthesizing the data signal and the attenuated clock signal; a laser generator for generating a laser beam used to transmit the synthesized data signal and clock signal; and a modulator for coupling the synthesized data signal and clock signal to the laser beam and modulating the coupled signal, thereby providing the modulated optical signal to be transmitted to the receiver over an optical fiber

Abstract: A method for enhancing transmission efficiency of burst data by estimating a void between burst data and filling the void with new burst data in an optical burst switching (OBS) network. To this end, a node in the OBS network receives burst data (BD) aggregated from data packets, and a burst control packet (BCP) that is received prior to the BD by an offset time. The BCP contains information relating to the offset time and the BD. To predict the void between the BDs, a void filling time is defined within the offset time using the BCP. The present invention provides the method for determining whether to fill the void and filling the void by directly monitoring the BD over a preset time.

Abstract: A high-speed wavelength selectable optical source and a method thereof are disclosed. The wavelength selectable optical source includes at least one optical source having a multimode oscillation spectrum, a demultiplexer and an optical switch for extracting light having a certain selected wavelength. A certain wavelength can be selected among the multimode wavelengths using the demultiplexer and the optical switch, and thus the wavelength can discontinuously be tuned at high speed. Also, by making the light having the selected wavelength incident to the multimode optical source, the power of the output light can uniformly be maintained and maximized through injection locking.

Abstract: A wavelength converter for generating a wavelength tunable laser optical source in itself is disclosed. The wavelength converter includes a first semiconductor optical amplifier for generating an optical noise, generating and outputting a first optical source by amplifying the generated optical noise if an external current is applied, first and second distributed Bragg reflectors for reflecting only a component of a specified wavelength range among components of the optical noise and applying the reflected component to the first semiconductor optical amplifier, and a second semiconductor optical amplifier for receiving an optical source divided from the optical source reflected by and outputted from the first distributed Bragg reflector and an input data optical source, generating and outputting a second optical source by changing a phase of the divided optical source according to a digital signal from the input data optical source.

Abstract: An apparatus and method for effectively transmitting a packet data and a control data of path information about the packet data in an optical packet data switching network. The method includes grouping a plurality of wavelengths into at least two wavelength bandwidths, each wavelength bandwidth being composed of neighboring wavelengths, and transmitting the optical packet data and the control data with wavelengths of different wavelength bandwidths respectively. Since the wavelength to transmit the optical packet data and the wavelength to transmit the control data has a difference from each other, a node receiving optical data easily divides the packet data and the control data.