KR20090008017U - Optical subscriber line monitoring and test equipment using optical bandpass filter - Google Patents

Optical subscriber line monitoring and test equipment using optical bandpass filter Download PDF

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KR20090008017U
KR20090008017U KR2020080001610U KR20080001610U KR20090008017U KR 20090008017 U KR20090008017 U KR 20090008017U KR 2020080001610 U KR2020080001610 U KR 2020080001610U KR 20080001610 U KR20080001610 U KR 20080001610U KR 20090008017 U KR20090008017 U KR 20090008017U
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optical
subscriber
line
line monitoring
light source
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KR2020080001610U
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Korean (ko)
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이근량
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이근량
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795Performance monitoring; Measurement of transmission parameters
    • H04B10/07957Monitoring or measuring wavelength
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01Frequency selective two-port networks
    • H03H7/12Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25Arrangements specific to fibre transmission
    • H04B10/2581Multimode transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

본 발명은 PON 형태의 광가입자망의 선로 감시 시스템에 관한 것으로, 광분배기 이후에 가입자 수와 같은 다른 파장을 갖는 광원, 특정 파장의 광원신호 만을 통과시키기 위한 대역통과 광학필터를 포함하는 것을 특징으로 한다. The present invention relates to a line monitoring system of a PON type optical subscriber network, comprising a light source having a different wavelength such as the number of subscribers after the optical splitter, and a band pass optical filter for passing only a light source signal having a specific wavelength. do.

상기와 같은 본 발명에 따르면, 광분배기 이후에 광선로에 대해서도 따로 따로 선로를 감시할 수 있으므로 정확한 장애 위치를 알 수 있다. According to the present invention as described above, since the line can be monitored separately for the optical path after the optical splitter, it is possible to know the exact position of the failure.

PON 광가입자망, 선로감시 시스템, 광분배기, 파장다중화 및 역다중화기, 대역 통과 광학필터,광순환기 PON optical subscriber network, line surveillance system, optical splitter, wavelength multiplexer and demultiplexer, band pass optical filter, optical circulator

Description

대역통과 광학 필터를 이용한 광가입자 선로 감시 및 시험장치{ Optical subscriber line monitoring and test equipment using optical bandpass filter } Optical subscriber line monitoring and test equipment using optical bandpass filter}

본 발명은 PON( Passive Optical Network ) 방식의 광가입자 선로의 감시 및 시험 장치에 관한 것으로, 특별히 광분기기가 이후에 분기된 광가입자 선로의 이상유무를 확인하기 위한 선로 감시 및 시험장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for monitoring and testing an optical subscriber line of a passive optical network (PON) system, and more particularly, to an apparatus for monitoring and testing a line for checking an abnormality of an optical subscriber line branched later by an optical splitter.

종래의 방법에 경우 전화국과 가입자 간의 통신과 겹치지 않는 파장을 갖는 광원을 광가입자 선로 감시용 광원으로 사용하고, 가입자 초단에서 감시용 광신호를 차단하는 방법으로 선로감시를 하는 장비가 상용화되어 있으나 이 경우 광분배기 이후 단에 광학 응답이 겹쳐져서 정확한 선로와 손실의 위치를 파악하기 위해서는 기존에 정상적인 선로의 정보와 비교, 분석을 해야 하는 문제점이 있었다. In the conventional method, a line monitoring device is commercially available by using a light source having a wavelength that does not overlap with communication between a telephone station and a subscriber, as a light source for monitoring an optical subscriber line, and blocking the optical signal for monitoring at the subscriber stage. In this case, there is a problem in that the optical response is overlapped after the optical splitter to compare and analyze the information of the conventional line in order to determine the exact position of the line and the loss.

본 발명은 상기와 같은 문제점을 해결하기 위해 고안된 것으로, 본 발명의 목적은 모든 가입자 선로를 서로 다른 파장의 광원으로 각각 확인하여 장애의 유무와 위치에 대한 정보를 정확하게 알 수 있도록 하는 것이다.The present invention has been devised to solve the above problems, and an object of the present invention is to identify all subscriber lines with light sources of different wavelengths, so that the information on the presence and location of obstacles can be accurately known.

상기와 같은 목적을 달성하기 위한 본 발명의 구성은, 전화국과 가입자간의 통신파장과 다른 선로감시용 파장을 갖는 선로감시용 광원 , 선로감시용 광원을 기존 통신 광섬유에 혼합하는 파장다중화 및 역다중화기, 가입자선로를 여러 가입자로 분기하는 광분배기, 광분배기 후로 광가입자망 별로 다른 파장의 선로감시용 광신호만을 선택적으로 통과시키는 대역통과 광학필터, 광가입자망 끝에 가입자 광송수신기 초단에 통신 이외에 선로감시용 광원의 광신호를 차단하는 차단필터로 구성된다.The configuration of the present invention for achieving the above object is a wavelength multiplexing and demultiplexer for mixing a line monitoring light source, a line monitoring light source having a line monitoring wavelength different from the communication wavelength between the telephone station and the subscriber, an existing communication optical fiber, Optical divider for dividing subscriber line to multiple subscribers, Band pass optical filter for selectively passing optical signals of different wavelengths for each optical subscriber network after optical divider, and Line monitoring at the beginning of subscriber optical transmitter at the end of optical subscriber network It is composed of a blocking filter for blocking the optical signal of the light source.

여기서,상기 광원은 광분배기에서 분기되는 광가입자 선로 수와 같은 수의 파장을 갖는 여러개의 광원으로 구성되어지고 각 광원의 출력은 파장다중화 소자에 의해서 결합되어 진다.Here, the light source is composed of a plurality of light sources having the same number of wavelengths as the number of optical subscriber lines branched from the optical splitter, and the output of each light source is coupled by a wavelength multiplexing element.

광선로 감시용 여러 파장의 광원의 광신호는 가입자통신용 광신호와 결합되어 광분배기까지 전송된 후에 가입자 수, 즉 광분배기 출력 포트수로 분배된다. 분배된 광신호는 대역통과 필터에 의해서 선택적으로 출력되어 가입자망을 통해 가입자에게 전송된다. 광분배기에 출력은 대역통과 필터로 인하여 광선로 감시용 광 원 중에 하나의 파장 신호만 전송되어 광선로감시 장치에서는 다른 광가입망 선로와 구별할 수 있다.The optical signal of the light source of various wavelengths for monitoring the light beam is combined with the optical signal for subscriber communication and transmitted to the optical splitter and then distributed to the number of subscribers, that is, the number of optical splitter output ports. The distributed optical signal is selectively output by the bandpass filter and transmitted to the subscriber through the subscriber network. The output to the optical splitter is transmitted by only one wavelength signal among the optical path monitoring light sources due to the bandpass filter, so that the optical path monitoring device can distinguish it from other optical fiber network lines.

상기와 같은 본 발명에 따르면, 분기 되는 가입자 수만큼의 서로 다른 파장에 광원을 이용하여 광선로를 확인하면 광분기기 이후에 선로를 각각 확인할 수 있어 정확한 장애 위치와 내용을 확인할 수 있어 신속한 고장검출과 복구가 가능하다.According to the present invention as described above, if you check the optical path using the light source at different wavelengths as the number of subscribers to be diverged, each of the lines can be confirmed after the optical splitter, so that the exact location and contents of the fault can be confirmed, so that the fault can be quickly detected and recovered. Is possible.

도1은 기존의 광선로 감시 기능이 없는 광가입자 망의 대표적인 구조이다. 하나의 전화국 광송수신기(1)의 출력을 가입자 근처까지 하나의 광섬유(2)로 전송 한 후에 광분기기(3)를 이용하여 여러 가입자와 별도의 광섬유(4)로 연결 한 후에 가입자 광송수신기(5)에 연결된다. 1 is a representative structure of an optical subscriber network without a conventional optical path monitoring function. After transmitting the output of one telephone station optical transceiver 1 to one optical fiber 2 near the subscriber, the optical fiber receiver 5 is connected to the optical fiber 4 by using the optical splitter 3 and then to a separate optical fiber 4 )

도2는 이러한 기존 광가입자망에 고안된 광선로 검사 기능을 추가한 경우이다. 광선로를 감시하기 위한 광원은 기본적으로 가입자 통신에 사용되는 파장과 달라야 통신에 영향을 주지 않고 선로를 검사할 수 있다. 또한 본 발명에서는 광분기기(3)에 연결되는 광가입자 숫자 만큼에 서로 다른 파장을 갖는 여러 개의 검사용 광원(10)을 사용한다. 이러한 여러개의 광원(10)을 광다중화기(11)를 이용하여 하나의 광출력으로 만든 후 광선로(2)(4)에서 되돌아오는 레일리 산란 광신호와 분리하기 위해 광순환기(13)를 사용하고 검출된 레일리 산란 광신호는 OTDR (Optical Time Domain Reflectometry ) 방식으로 해석되어 장애 위치를 판단한다. 광순환기(13)는 다시 광다중화 기기(12)을 이용하여 전화국의 광송수신기(1)의 광신호와 결합하여 가입자용 광선로(2)로 연결된다. 광가입자 근처에 위치하는 광분배기(3)는 전화국의 광신호를 분기,결합하는 역활을 한다.광분배기(3)에 의해 분기 된 신호는 다시 별도의 광 가입자선로(4)를 통해서 가입자광송수신기(5)에 연결된다. 이전에 광분배기(3)의 가입자측에 하나의 감시용 파장만을 통과시키는 대역통과 광학필터(16)을 사용하여 광분배기(3)에 연결된 가입자 광선로(4)에는 각각 서로 다른 파장의 선로 감시용 광원신호만 전송되도록 한다. 이 선로 감시용 광신호는 가입자 광송수신기 전에서 가입자 통신에 영향을 미치지 않도록 광학필터(17)에 의해서 차단된다. Figure 2 is a case of adding the optical path inspection function designed in such an existing optical subscriber network. The light source for monitoring the light path is basically different from the wavelength used for subscriber communication so that the line can be inspected without affecting the communication. In addition, in the present invention, a plurality of inspection light sources 10 having different wavelengths are used for the number of optical subscribers connected to the optical splitter 3. The light circulator 13 is used to separate these light sources 10 into a single light output using the optical multiplexer 11 and then separate them from Rayleigh scattering light signals returned from the optical paths 2 and 4. The detected Rayleigh scattering optical signal is interpreted by an optical time domain reflectometry (OTDR) method to determine a fault location. The optical circulator 13 is again coupled to the subscriber optical path 2 by combining with the optical signal of the optical transceiver 1 of the telephone station using the optical multiplexing device 12. The optical splitter 3 located near the optical subscriber plays a role of branching and combining the optical signals of the telephone station. The signal split by the optical splitter 3 is again connected to the subscriber light through a separate optical subscriber line 4. It is connected to the transceiver (5). Each of the subscriber optical paths 4 connected to the optical splitter 3 using a band pass optical filter 16 which previously passes only one monitoring wavelength to the subscriber side of the optical splitter 3, respectively, monitors lines of different wavelengths. Only the light source signal is transmitted. This line monitoring optical signal is blocked by the optical filter 17 so as not to affect subscriber communication before the subscriber optical transmitter and receiver.

도1은 상용화되어 있는 광가입자망의 개념적인 구성을 표시한 블록도 이다 1 is a block diagram showing the conceptual configuration of a commercially available optical subscriber network.

도2는 본 발명의 실시예에 따는 광가입자망의 개념적인 구성을 표시한 블록이다2 is a block showing the conceptual configuration of an optical subscriber network according to an embodiment of the present invention.

주요도면부호에 관한 설명 Explanation of Main Drawing Codes

1: 전화국 광송수신기 1: Telephone Station Optical Transceiver

2: 광분배기까지 광가입자 선로 2: optical subscriber line to optical splitter

3: 광분배기 3: optical splitter

4: 광분배기 이후에 광가입자 선로 4: optical subscriber line after optical splitter

5: 가입자 광송수신기5: subscriber optical transmitter and receiver

10: 여러개의 파장을 갖는 광선로 감시용 광원10: light source for monitoring by light rays having multiple wavelengths

11: 여러 광원의 광신호를 혼합하는 광파장 다중화기 11: Optical Wavelength Multiplexer Mixing Optical Signals from Multiple Light Sources

12: 전화국 광송수신기의 광신호와 선로감시용 광신호를 결합하는 광파장 다중화,역다중화기 12: Optical wavelength multiplexing and demultiplexer combining optical signal of telephone station optical transmitter and line monitoring optical signal

13: 광가입자 선로에 송신되는 선로감시용 광신호와 수신되는 선로 감시용 광신호를 결합,분리하는 광순환기 13: Optical circulator that combines and separates the optical signal for line monitoring transmitted to the optical subscriber line and the optical signal for line monitoring received

14: 수신된 선로감시용 광신호를 파장별로 구분하는 광파장 역다중화기 14: an optical wavelength demultiplexer for dividing the received line monitoring optical signal by wavelength

15: 수신된 선로 감시용 광신호를 전기 신호로 변환하는 수광소자 15: a light receiving element for converting the received optical signal for monitoring the line into an electrical signal

16: 광분기기에 가입자측에 설치되어 하나의 선로 감시용 파장만을 통과시키는 대역통과 광학필터16: Bandpass optical filter installed at the subscriber side in optical splitter to pass only one line monitoring wavelength

17: 가입자 광송수신기 전단에 설치되어 선로감시용 광신호를 차단하는 광학필터 17: Optical filter installed in front of subscriber optical transceiver to block optical signal for line monitoring

Claims (2)

광분기기에 분기 수 만큼의 다른 파장을 갖는 선로 감시용 광원,상기 선로 감시용 광원 중에 하나의 파장만을 통과할 수 있는 대역통과 광학필터들을 포함하는 것을 특징으로 하는 광가입자 선로감시 장치An optical subscriber line monitoring device comprising: a line monitoring light source having a different number of wavelengths in the optical splitter; and band pass optical filters capable of passing only one wavelength among the line monitoring light sources. 광분배기의 가입자측에 상기 대역통과 광학필터가 위치하도록 하여 분기된 이후에 광가입자 광선로에는 상기 여러 파장의 광선로 감시용 광원 중에 하나만을 통과하도록 하여 광분기기 이후에 가입자 광선로는 하나만의 광선로 감시용 광원으로 광선로 감시할 수 있는 광가입자 선로 및 시험 장치The bandpass optical filter is positioned on the subscriber side of the optical splitter, and after splitting, the optical subscriber beam passes only one of the light sources for monitoring the light of the various wavelengths. Optical subscriber line and test device that can be monitored by light with light source
KR2020080001610U 2008-02-02 2008-02-02 Optical subscriber line monitoring and test equipment using optical bandpass filter KR20090008017U (en)

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