Abstract:
1. 청구범위에 기재된 발명이 속하는 기술분야 본 발명은 파장영역 광 CDMA 시스템 등에서 양극성 데이터를 송신하기 위한 파장영역 광 CDMA 송신장치 및 그 방법에 관한 것임. 2. 발명이 해결하려고 하는 기술적 과제 본 발명은, 하나의 광 CDMA 인코딩 장치와 하나의 광 변조기를 포함하는 간단한 구조의 파장영역 광 CDMA 송신장치 및 그 방법을 제공하는데 그 목적이 있고, 또한, 하나의 광 CDMA 인코딩 장치와 하나의 광 변조기를 사용하여 간단한 구조로 구현하되, 인코딩 과정에서 변형된 PN 코드를 사용함으로써 각 CDMA 채널간의 간섭을 극소화시켜 광 CDMA 전송특징을 향상시키기 위한 파장영역 광 CDMA 송신장치 및 그 방법을 제공하는데 다른 목적이 있음. 3. 발명의 해결 방법의 요지 본 발명은, 양극성 데이터를 송신하기 위한 파장영역 광 코드분할다중접속(CDMA) 송신장치에 있어서, 외부로부터 입사되는 광을 특정코드나 또는 상기 특정코드의 상보코드로 인코딩하기 위한 광 CDMA 인코딩 수단; 및 2×1 광변조기(또는 광스위치) 한 개를 사용하여, 외부로부터 입력되는 전송할 데이터 값이 "1"인 경우 상기 광변조기의 일입력단으로 입력되는 상기 광 CDMA 인코딩 수단에서 특정코드(또는 상보코드)로 인코딩된 광신호를 통과시키고 타입력단으로 입력되는 상기 광 CDMA 인코딩 수단에서 상보코드(또는 특정코드)로 인코딩된 광신호를 차단하며, 전송할 데이터 값이 "0(또는 -1)"인 경우 상기 일입력단으로 입력되는 상기 상보코드(또는 특정코드)로 인코딩된 광신호를 통과시키고 상기 타입력단으로 입력되는 상기 특정코드(또는 상보코드)로 인코딩된 광신호를 차단하기 위한 광 변조 수단을 포함함. 4. 발명의 중요한 용도 본 발명은 파장영역 광 CDMA 시스템 등에 이용됨.
Abstract:
PURPOSE: A method for transmitting bipolar signals in an optical switch-type optical CDMA system is provided to use an electric multiply element in an encoder, and to use one optical switch and two optical detectors in a decoder, then to implement the optical switch-type CDMA system, thereby simplifying structure of the CDMA system. CONSTITUTION: An encoder comprises as follows. An encoding code generator(13) generates an encoded code. An electric multiply element(15) multiplies an electrical signal and an information signal by the encoded code. The first optical switch(12) receives the electrical signal and light outputted from a light source(11), and outputs an encoded optical signal. A decoder comprises as follows. A decoding code generator generates a decoded code. The second optical switch switches the optical signal outputted from the encoder according to an electrical signal for the decoded code. The first and the second optical detectors detect the optical signal. A signal difference generator generates differences between signals outputted from the first and the second optical detectors.
Abstract:
PURPOSE: An apparatus for inserting/extracting an optical signal having a particular wavelength from an arbitrary node on a WDM-based optical communication system or optical network is provided to perform an optical signal inserting/extracting function by using one bulk type dielectric optical layer and four lenses. CONSTITUTION: An optical signal processing unit is installed at a terminating part of a free space within a system in order to insert and extract an optical signal of a particular wavelength. A bulk type dielectric optical layer(115) is installed in the inside of the free space in order to reflects or transmits the optical signal of the particular wavelength and reflect or transmits the remaining optical signals. First and second focusing lenses(111,114) are installed at both sides of the bulk type dielectric optical layer in order to shift the optical signals of the optical signal processing unit to the dielectric optical layer and shift the optical signals of the dielectric optical layer to the optical signal processing unit. First and second collimating lenses(112,113) are installed between the bulk type dielectric optical layer and the first focusing lens and between the bulk type dielectric optical layer and the second focusing lens.
Abstract:
PURPOSE: An apparatus for receiving signals in an optical code-division multiple- access system, and a method therefor are provided to ease increase in a bit error rate due to multiple access interference and improve the performance of an optical network by reducing number of cases of bit errors. CONSTITUTION: If receiving a plurality of optical signals forming a code, an optical branching filter(100) selectively disperses the received optical signals to a plurality of optical delay lines(200). A plurality of optical couplers(300) collect the optical delay lines(200) into groups. A plurality of photo detectors(400) detect the size of the optical signals by groups. A plurality of bit decision circuits(500) decide the kind of bits by groups by comparing the size of the optical signals by groups with a predetermined threshold. A operating element(600) recognizes final data bit according to the kind of bits.
Abstract:
PURPOSE: A method for transmitting a radio access network packet having a wavelength identification code system is provided to assign inherent wavelengths every RNC(Radio Network, Controller), and to transceive data in single wavelength, thereby simplifying a packet transmission procedure as supporting a high-speed mobile service. CONSTITUTION: MTs(Mobile Terminals) perform wireless channel setup procedures(S701), and transmit service request packets to an RNCj(S702). The RNCj transmits the packet to an SRCi(Sub Ring Controller)(S703). The SRCi performs a subscriber authentication procedure(S704), and transmits a service request response to the RNCj(S705). The RNCj transmits the response to the MTs(S706). The MTs transmit a data packet to the RNCj(S707). The RNCj transmits the data packet to the SRCi(S708). The SRCi receives packet signals, analyzes an address of the packet, and delivers a new packet to a main ring by loading the packet into a wavelength(S709). An MRC(Main Ring Controller) transmits a packet to a buffer(S710). The packet is delivered to a sub ring(S711). The wavelength is transmitted to the MTs(S712).
Abstract:
PURPOSE: A wavelength converting device using a fixed-wavelength optical source and an optical cross connect system applying the same are provided to simplify its composition and reduce a manufacturing cost by using a laser beam outputted from the fixed-wavelength optical source as a probe beam. CONSTITUTION: A plurality of fixed-wavelength optical source(LD1-LDN) output a plurality of output beams with inter-different fixed wavelengths. An NMxNM space switch(100) selects at least one output beam having a wavelength corresponding to the wavelength conversion request of a transmission signal among a plurality of output beams inputted from the fixed-wavelength optical source(LD1-LDN), and outputs the selected output beam as a probe beam. A plurality of wavelength converters(110) receive the probe beams outputted from the NMxNM space switch(100) and transmission signals, and convert the wavelengths of the transmission signals inputted by a cross gain modulation, a cross phase modulation, or an O/E/O(Optical/Electric/Optical) conversion of the transmission signal.
Abstract:
A spectrum-sliced seed light module for a wavelength division multiplexing passive optical network (WDM PON) is provided. The seed light module includes an optical amplifier to amplify seed light, an optical wavelength filter to transmit broadband light, which is output in opposite direction to an output direction of the seed light, at periodic frequency intervals, and a reflective mirror to reflect light which is spectrum-sliced through the optical wavelength filter to the optical wavelength filter.
Abstract:
본 발명은 OLT 및 ONU의 광송신기에 RSOA를 사용하고, 별도의 스펙트럼 분할된 상태의 광을 OLT 및 ONU의 RSOA에 주입하는 WDM-PON 구조 및 TDMA 방식을 결합하여, ONU의 수용을 증가시키며, 기존의 TDMA 방식의 ONU를 수용할 수 있는 WDM-PON 구조를 제공한다. 그 WDM-PON은 국사에 위치하고 가입자 측으로 하향 광신호를 송출하며, 상기 가입자 측으로부터 올라오는 상향 광신호를 수신하는 OLT(Optical Line termination)부; 가입자 측에 위치하고 상기 OLT부로부터의 상기 하향 광신호를 수신하며, 상기 OLT부로 상기 상향 광신호를 송출하는 ONU(Optical Network Unit)부; 상기 국사에 위치하고 스펙트럼(spectrum) 분할된 다파장 씨드 광을 파장다중 형태로 상기 OLT부 및 ONU부에 공급하는 씨드 광원 모듈; 및 상기 OLT부로부터의 상기 하향 광신호를 파장 분리하여 상기 ONU부로 출력하고 상기 ONU부로부터의 하향 광신호를 파장 다중화하여 상기 OLT부로 출력하는 RN(Remote Node);를 포함하고, 상기 OLT부 및 ONU부의 광송신기들이 상기 씨드 광을 이용하여 상기 하향 및 상향 광신호를 생성한다. WDM-PON, Seed Light, WDM-TDM Hybrid PON, Color-less Optical Transmitter, G-PON, E-PON,