Abstract:
본 발명은 다파장 레이저 발생장치에 관한 것으로, 다파장 레이저를 생성하기 위한 자발 방출광을 방출하거나, 광을 입력받을 경우 입력받는 광이 갖는 파장으로 발진하여 출력광을 방출하고 제1광원으로부터 자발 방출광을 입력으로 받아, 제2광원으로부터 하나 이상의 반사광을 방출하며, 제1광원과 제2광원으로부터 방출되는 광을 하나 이상의 파장으로 상호 주입된 광원을 생성하기 위한 다채널 필터부를 포함하되, 제1광원과 제2광원은 반사형 반도체 광 증폭기(RSOA), 반도체 광 증폭기(SOA) 또는 패브리-페롯 다이오 중 적어도 하나인 것을 그 요지로 한다.
Abstract:
PURPOSE: A high definition video optical transmission system is provided to transceive a high definition image signal, a control signal, and a data signal through one optical path without confusion. CONSTITUTION: A control/data mixer(120) generates a control/data signal by mixing a control signal with a data signal. Frequency increase converters(130,140) perform the frequency increase conversion of the control/data signal. A mixer(160) mixes an image signal with the control/data signal. An electrophotic converter(170) converts each of the mixed signals into an optical signal to transmit the optical signal to an optical path. [Reference numerals] (110) Data channel transceiver; (120) Control/data signal mixer/separator; (140) Mixer; (150) Video signal transmitter(High-definition camera); (160) Signal mixer/distributor; (170) Photoelectric/electric light converter; (200) Light receiving unit; (300) Optical fiber path; (AA) Control signal; (BB) Video signal; (CC) Electric signal; (DD) Optical signal;
Abstract:
PURPOSE: An NRZ(Non Return to Zero) signal clock extraction method capable of using a two mode fiber is provided to perform the 3R(Retiming, Reshaping, Re-amplification) with the extracted clock signal by having a similar function with the previous clock signal. CONSTITUTION: An optical signal is modulated into an NRZ-DPSK(Differential Phase Shift Keying) signal through a modulator. The NRZ-DPSK signal is transformed to a RZ(Return to Zero)-OOK(On-Off Keying) signal through a converter by being constructive interference between the previous signal and the time-delayed signal. The RZ-OOK signal is extracted as an optical clock signal by being applied to a mode locked optical fiber ring laser through a circulator. The optical clock signal is a 10-GHz clock signal extracted from a 10-Gbit/s NRZ-DPSK signal, and the timing jitter is less than 1.6ps.
Abstract:
PURPOSE: A spanning tree based routing method using a local searching algorithm in a high mobility sensor network is provided to improve network utilization by providing an effective local searching algorithm. CONSTITUTION: An MST(Minimal Spanning Tree) is used as a start point of local searching(S210). A proximity solution is created(S220). Numbers of wiener are calculated for the proximity solution(S230). A tree including the smallest numbers of the wiener in the proximity solution are searched(S240). The numbers of the wiener is not changed, the tree which is acquired at the last is determined as the solution.
Abstract:
PURPOSE: A fault optical network unit detection method using data transmission error detection in a GPON(Gigabit-capable Passive Optical Network) is provided to detect a fault ONU(Optical Network Unit) using detection of a generated data transmission error when light of the ONU connected to an OLT(Optical Line Terminal) is transmitted in the GPON. CONSTITUTION: A MAC(Medium Access Control) layer monitors traffic by using a GEM(GPON Encapsulation Method) header of a GTC(GPON Transmission Convergence) frame. The MAC layer finds an ONT(Optical Network Terminal) which data is not delivered. The MAC layer assigns an upstream bandwidth of the ONT with other method which is not round-robin. The MAC layer detects a fault ONT. [Reference numerals] (AA) Communication error; (BB) Example of normal operation
Abstract:
PURPOSE: A sensor using a self-injection locked reflective semiconductor optical amplifier for measuring marine temperature and strain is provided to measure changes in temperature and strain based on the power of an optical bragg lattice as the power of an optical fiber bragg lattice is linearly changed according to changes in the temperature and strain. CONSTITUTION: A sensor using a self-injection locked reflective semiconductor optical amplifier for measuring marine temperature and strain comprises a reflective semiconductor light amplifier(110), a variable optical fiber bragg grating(130), optical fiber bragg gratings(160-200), and a light spectrum analyzer(140). The reflective semiconductor light amplifier is self-injection locked. The variable optical fiber bragg grating generates variable laser sources by self-injection locking the reflective semiconductor light amplifier. [Reference numerals] (110) Reflective semiconductor light amplifier; (140) Light spectrum analyzer;
Abstract:
PURPOSE: A signal extracting device is provided to improve a CNR(Carrier-to Noise Ratio) by generating PRZ(Pseudo Return-to-Zero). CONSTITUTION: A clock extracting unit extracts a clock from an NRZ signal. Interval lattice is regularly arranged in parallel. A generating unit generates a clock signal by using an optical fiber ring laser which is locked with the interval lattice. The interval lattice is constructed as a cladding mode and a core mode. The interval lattice is used as an NRZ-to-PRZ converter.
Abstract:
PURPOSE: A PFMIPv6 based vertical handover method is provided to continuously offer a multimedia service by connecting various APs(Access Point) through a terminal including a multi-wireless interface. CONSTITUTION: When a report message is transmitted by an MIHF(Media Independent Handover Function) of a corresponding terminal, the MIHF transmits a network layer message which notifies the initialization of handover to a previous MAG(Mobile Access Gateway). When the previous MAG receives the layer message, the previous MAG previously transmits information which is the same as an MN-ID(Mobile Node-Identification) and LMAA to a new MAG. After an IP(Internet Protocol) address is set, the new MAG transmits a PBU(Proxy Binding Update) message and receives PBA(Proxy Binding Acknowledgement).
Abstract:
PURPOSE: An optical microwave notch filter is provided to design a filter which signal-processes based on the optoelectronic technology in a microwave system processing high frequency band signals, thereby improving the convenience of operation and economical efficiency of the system. CONSTITUTION: An optical microwave notch filter capable of using a multiple optical source comprises the followings: a multiple optical source generating apparatus(400) consisting of a reflective semiconductor optical amplifier(100) of a single optical source and generating the optical source corresponding to a coefficient, and a plurality of bragg grid having an optical divider/coupling device and a constant interval; an optical modulator(500) receiving microwave signals; an optical delaying apparatus(600) including the multiple optical source generating apparatus(400) having all fibers or delay characteristic including the dispersion value, and having the optical time delay; an optical detector(700) detecting a signal processed in an optical region; a means which newly generates the optical source corresponding to a plurality of coefficient, a means controlling the time delay by newly controlling the generated optical source wave interval, and a means and an apparatus obtaining a response curve of a filter by controlling the time delay of the optical delaying apparatus(600) by controlling an optical fiber length and the dispersion value. [Reference numerals] (400) Multiple optical source generating apparatus; (500) Optical modulator; (600) Optical delaying apparatus; (700) Optical detector;
Abstract:
PURPOSE: A code division multiplexing optical fiber Bragg lattice sensor network is provided to execute monitoring without a collision at the center by multiplexing information received from each sensor. CONSTITUTION: A first sensor and a second sensor sense signals. A reflective semiconductor optical amplifier amplifies the amplitude of a signal reflected from the first sensor and the second sensor. The first and the second sensor are mutually independent. The peak of a pulse outputted from the reflective semiconductor optical amplifier is linearly changed.