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KR101556499B1 - Integrated module for optical signal transmission-reception and optical line check, optical multiplexer and optical network management system using the same - Google Patents

Integrated module for optical signal transmission-reception and optical line check, optical multiplexer and optical network management system using the same Download PDF

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Publication number
KR101556499B1
KR101556499B1 KR1020150104818A KR20150104818A KR101556499B1 KR 101556499 B1 KR101556499 B1 KR 101556499B1 KR 1020150104818 A KR1020150104818 A KR 1020150104818A KR 20150104818 A KR20150104818 A KR 20150104818A KR 101556499 B1 KR101556499 B1 KR 101556499B1
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KR
South Korea
Prior art keywords
optical
signal
line
transmission
check
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KR1020150104818A
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Korean (ko)
Inventor
이현곤
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주식회사 엔제이시스템
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0771—Fault location on the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/275—Ring-type networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal

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

Abstract

The present invention relates to an integrated module, an optical multiplexing device, and an optical network management system using the optical module as an optical signal transmission / reception module and serving as a line checking module when necessary. The integrated optical signal transmission / A transmission side switching unit 10 for selectively driving the line checking mode; A laser diode (20) connected to the transmission side switching unit (10) and modulating an electric signal into an optical signal; A photodiode (30) for modulating a received optical signal into an electrical signal; An optical splitter 40 for transmitting transmission light or check light received from the laser diode 20 through an optical line and transmitting transmission light or check light received from the optical line to the photodiode 30; When the line check command is transmitted from the receiving side switching unit 50 and the external network management apparatus, which are connected to the photodiode 30 and selectively drive the signal transmission mode and the line checking mode, the transmission side switching unit 10, And a monitoring control unit 60 for switching the receiving side switching unit 50 to the line checking mode and calculating the distance from the remote terminal to the point where an optical path abnormality is generated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated optical module, an optical multiplexing device, and an optical network management system using the integrated module, optical multiplexing device, and optical network management system using the optical module.

The present invention relates to an optical network module, an optical multiplexing apparatus, and an optical network management system using the optical network module. More particularly, the present invention relates to an integrated module serving as an optical signal transmission / reception module, And an optical network management system.

Due to the acceleration of informatization, the amount of data movement and throughput have soared. Therefore, it has been a long time since the wired communication networks connecting the backbone network and the subscriber network started to be used.

These optical lines are usually buried underground and combined with optical network devices such as laser diodes, optical multiplexers, optical distributors, converters, splitters, hubs, etc. to form optical networks.

While optical networks have the advantage of broadband transmission, they are difficult to install (whether for economic or technical reasons), poor mechanical properties, and difficult to maintain stable operation due to deterioration due to aging.

Among the elements that make up the optical network, the equipment such as the optical multiplexer is installed in a relatively stable environment such as a separate management room or inside the enclosure. In recent years, an element management system (EMS) capable of efficiently managing the configuration equipment It is relatively easy to monitor and manage. On the other hand, most of the light lines are exposed to the harsh outdoor environment, and in general, maintenance experience and installation environment (light lines are mainly buried in the ground, considering the arrangement of other underground structures such as gas pipes and water pipes) The technicians with coping skills are able to cope with the situations after they are aware of the situation. However, there are difficulties in monitoring and maintenance due to the lack of skilled technical manpower.

Therefore, it is recognized the importance of optical line monitoring, and optical line monitoring system is being introduced for stable operation and maintenance of the line. Patent Document 1 discloses such a conventional optical line monitoring system, and FIG. 1 is a conceptual diagram of a conventional optical line monitoring system.

The conventional optical line monitoring system is provided with a WDM (wavelength division multiplexing) coupler (not shown) for the optical line terminal 1, the optical distributor 2, the optical network unit 3 and the optical network terminal 4 constituting the existing optical network system 5, a monitoring device 6, and a control unit 7, and selectively monitors the presence or absence of an optical path by connecting the monitoring device 6 to the optical line.

The optical line terminal 1 is provided in a central base station such as a telephone office to transmit an optical signal to the optical distributor 2 and is transmitted from the optical distributor 2 to the optical network unit 3 or the optical network terminal 4, the optical signal is transmitted to the end 8 of the optical network. Considering the transmission of the optical signal in the opposite direction, the optical signal transmitted from the at least one optical network unit 3 or the optical network terminal 4 to the optical splitter 2 is transmitted to the central base station via the optical line terminal 1 do. The optical line terminal 1 may include a multiplexer (not shown) for transmitting signals of a plurality of wavelength bands together. In this case, the optical distributor 2 may multiplex the multiplexed And a demultiplexer (not shown) for transmitting the optical signal to each optical network unit 3 or the optical network terminal 4 by branching for each wavelength.

The conventional optical line monitoring system is provided with a monitoring function for the existing optical network system. The conventional optical line monitoring system includes a WDM coupler 5 provided between the optical line terminal 1 and the optical distributor 2 of the existing optical network system, And a control unit 7 connected to the monitoring device 6 and the monitoring device 6. [ Such a conventional optical line monitoring system generates monitoring light having a different wavelength from the signal light (light including data transmitted through the optical line of the existing optical network system) in the monitoring apparatus 6 (when the wavelengths of the signal light and the monitoring light are the same (Not to be able to separate the monitoring light to be transmitted to the monitoring device), coupling it to the optical line of the existing optical network system through the WDM coupler 5, and transmitting the scattered light from the monitoring device 6 via the optical line of the existing optical network system Or reflects the surveillance light, and calculates the point where the obstacle has occurred in the optical line depending on the degree of scattering or reflection of the surveillance light in the control unit 7.

However, since the conventional optical line monitoring system generates the monitoring light having a wavelength different from that of the signal light, and then transmits the optical signal with one optical signal after coupling with the signal light, the conventional optical line monitoring system, which includes a light source and a coupler, (1). Therefore, the efficiency of the optical network equipment is reduced except for the optical line, and the number of additional equipment is increased when the optical line monitoring system is changed by changing the existing optical network system, have.

KR 10-2013-0085538 A (Mar.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide an optical line transmission / reception system capable of constructing an optical line monitoring system with high installation and maintenance efficiency by making full use of existing optical network equipment And a line checking integration module.

The integrated module for optical signal transmission / reception and line inspection according to the present invention is a module included in a remote terminal of an optical network, and includes a transmission side switching unit for selectively driving a signal transmission mode and a line checking mode; A laser diode connected to the transmission-side switching unit and modulating an electric signal into an optical signal; A photodiode for modulating a received optical signal into an electrical signal; An optical splitter that transmits transmission light or check light received from the laser diode through an optical line and transmits transmission light or check light received from the optical line to the photodiode; When the line check command is transmitted from the receiving side switching unit and the external network management apparatus, which are connected to the photodiode and selectively drive the signal transmission mode and the line checking mode, the transmission side switching unit and the reception side switching unit are switched to the line checking mode And a monitoring control unit for calculating a distance from the remote terminal to a point where an abnormality of the optical path is generated in the remote terminal.

The optical network management system can be implemented simply by inserting the optical signal transmission / reception and line inspection integration module according to the present invention into an existing remote terminal.

Therefore, compared with the optical network management system that requires the conventional line monitoring apparatus, the system can be easily constructed, the maintenance can be simplified, and there is a considerable advantage in cost.

1 is a conceptual diagram of a conventional optical line monitoring system
2 is a block diagram of an integrated optical signal transmission / reception and line inspection module according to the present invention.
3 is a configuration diagram of an optical multiplexing apparatus to which an optical signal transmission / reception and line inspection integration module according to the present invention is connected.
Figs. 4 to 7 are a configuration diagram and an operational state diagram of a ring optical network management system
FIG. 8 is a detailed configuration diagram of a conventional optical network management system, and shows an operation state when an abnormality occurs in an optical path in the system
FIG. 9 is a diagram showing an operation state when an optical line abnormality occurs in the optical network management system according to the present invention

Hereinafter, an integrated optical signal transmission / reception and line inspection module according to the present invention and an optical network management system using the same will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of an optical signal transmission / reception and line inspection integration module according to the present invention. The integrated optical signal transmission and reception line monitoring module 100 according to the present invention includes a transmission side switching unit 10, a laser diode 20, an optical splitter 40, a photodiode 30, a reception side switching unit 50, And a monitoring control unit (60).

The transmission side switching unit 10 is a component capable of selectively driving the signal transmission mode and the line check mode. The transmission side switching unit 10 includes a transmission signal drive 12 for processing a transmission signal in normal mode, i.e., a signal transmission mode, A first check signal drive 14 for processing a line check signal in the line check mode and a first switch 16 for switching the transmit signal drive 12 and the first check signal drive 14 . At this time, the processing of the transmission signal is subjected to the PCM modulation processing, and the first check signal drive 14 adjusts the pulse width of the check light in accordance with the measurement environment by the distance and the failure type by using the PLL (Phase Locked Loop) Change.

Therefore, in normal operation, the transmission signal generated by the optical multiplexer 200 is transmitted to the laser diode 20 via the transmission signal drive 12 and the first switch 16, and when the line is checked, And is transmitted to the laser diode 20 via the signal driver 14 and the first switch 16.

The laser diode 20 is a component for generating a laser beam using a semiconductor, and modulates a transmission signal or an inspection signal, which is an electric signal, with an optical signal (hereinafter, referred to as 'transmission light' inspection light). At this time, it is preferable that light having a wavelength of 1310 mm or 1550 mm having a small loss in the optical fiber is used. The laser diode 20 is connected to the transmission side switching unit 10, specifically, the first switch 16.

The photodiode 30 is a component that modulates a received optical signal into an electrical signal, and is a kind of photodetector. The electric signal generated by the photodiode 30 is transmitted to the receiving-side switching unit 50.

The optical splitter 40 transmits the transmission light or the check light received from the laser diode 20 through an optical line, and the received light or the check light (reflected or scattered by the optical network) received from the optical line is transmitted through the photodiode 30, As shown in FIG.

The receiving-side switching unit 50 is a component capable of selectively driving the signal transmission mode and the line checking mode. The receiving-side switching unit 50 includes a reception signal drive 52 for processing a reception signal in a normal mode, that is, A second check signal drive 54 for processing the line check signal in the line check mode and a second switch 56 for switching the receive signal drive 52 and the second check signal drive 54 . When the transmission-side switching unit 10 performs the PCM modulation processing on the signal, the reception signal drive 52 performs the PCM demodulation processing on the reception signal, and the second check signal drive 54 measures the line check signal on a distance- Change the receiving range of the inspection light to suit the environment by using a PLL (Phase Locked Loop).

Therefore, in normal operation, the received signal is transmitted to the optical multiplexer 200 via the second switch 56 and the received signal drive 52. When the line is checked, the check signal is transmitted to the second switch 56 and the second check signal And is transmitted to the optical multiplexing apparatus 200 via the drive 54.

The supervisory control unit 60 switches the first switch 16 and the second switch 56 to the first check signal drive 14 when a line check command is received from an external network management system (NMS) And the second check signal drive 54, and switches the optical network to the line checking mode. The monitoring control unit 60 monitors the distance at which the optical path abnormality occurs in a remote terminal (RT) including the optical signal transmission / reception and line check integration module according to the present invention using the reflected or scattered inspection light in the optical network And transmits it to the optical multiplexing apparatus 200. The optical multiplexing apparatus 200 transmits the same to the network management system.

Therefore, the integration module for optical signal transmission / reception and line inspection according to the present invention can solve the increase in equipment complexity and manufacturing cost due to the need for monitoring light of a wavelength different from that of a signal light. That is, the present invention has a core technical idea in using signal light as surveillance light.

3 is a block diagram of an optical multiplexing apparatus to which an optical signal transmitting / receiving and line checking integration module according to the present invention is connected. The optical multiplexing / demultiplexing apparatus 100 includes an optical signal transmission / Is the minimum configuration of the remote terminal of the optical network management system according to the present invention. In another aspect, the optical multiplexer / demultiplexer module 100 according to the present invention is installed in the slot of the conventional optical multiplexer 200, which is a new optical multiplexer, i.e., an optical multiplexer according to the present invention .

The optical multiplexing apparatus 200 includes a signal multiplexing engine 210 that performs a signal processing function by integrally multiplexing communication signals, control signals, and input / output signals including data and control commands, and optical signal transmission / reception And a signal control processing unit 220 that processes the alarm signal and the distance information transmitted from the integration module and controls other drive modules in the optical multiplexing device 200 (the control line is not shown in order to avoid the complexity of the drawing) do.

The signal multiplexing engine unit 210 performs multiplexing of electrical signals such as data, control commands, and the like, and all input / output signals through the optical signal transmission / reception and line check integration module according to the present invention.

The signal control processing unit 220 transmits to the signal multiplexing engine unit 210 a notification signal indicating an abnormality of the optical path when an abnormality of the optical path is detected (whether the data transmission rate drops sharply or the optical wave type abnormality is detected) And the notification signal is transmitted to the network management apparatus via the optical signal transmission / reception and line inspection integration module according to the present invention. And also performs overall control of the optical multiplexing apparatus 200.

Thereafter, when the line supervision command is transmitted from the network management apparatus to the optical signal transmission / reception and line check integration module according to the present invention through the optical multiplexing apparatus 200 and the distance where the optical path abnormality is generated is calculated, The distance where the abnormality of the optical line and the occurrence of the optical line abnormality are transmitted to the network management apparatus 500 via the signal multiplexing engine unit 210 is transmitted. Based on this information, the network management apparatus 500 displays a location where an optical path abnormality is generated on a map in which the network equipment and the optical line laying location are displayed in cooperation with a geographic information system (GIS) The accuracy and speed of recovery can be improved.

The optical network management system according to the present invention includes the optical signal transmission / reception and line inspection integration module 100, the optical multiplexing device 200 and the network management device 500 according to the present invention, (Location of network equipment, location of water pipe, gas pipe, electric wire, etc.), and the position where the optical path abnormality is generated when the GIS is interlocked with other information So that it can be grasped visually.

The optical network management system according to the present invention is more suitable when the network is a ring topology.

Figs. 4 to 7 are a configuration diagram and an operational state diagram of a ring optical network management system. Fig. The ring optical network management system includes a central office terminal (COT) 300, a plurality of remote terminals (RT) 400 connected to the central office and forming a ring network, and a central office And a network management device 500. The primary signal is transmitted along one direction of the ring network and the secondary signal is transmitted in the opposite direction. Therefore, even if an abnormality occurs in one part of the ring network, the network is not disconnected.

In addition, if an error occurs in a part of the network, since the remote terminal can know that the primary signal and the secondary signal are not transmitted, the approximate position of the point where the error occurs can be quickly detected (for example, between RT2 and RT3) At least one of the remote terminals on both sides of the occurrence point of the abnormality can calculate the distance to the point where the abnormality is generated by using the check light.

In this case, if the remote terminal on both sides of the point where the abnormality occurs generates the distance to the point where the abnormality is generated by using the inspection light, the position of the point where the abnormality occurs can be more accurately known, It is essential to calculate the distance using all of the remote terminals on both sides of the point where the anomaly occurred, since the distance can not be measured at the remote terminal if the point is within 100m from any remote terminal .

FIG. 8 is a detailed configuration diagram of a conventional optical network management system and an operational state diagram when an optical line abnormality occurs in the system.

In the conventional system, a separate optical line monitoring apparatus is added to the existing optical multiplexing system, and the inspection light (? 3 ) and the communication signal light (? 1 ,? 2 ) And a FWDM (Filter Wavelength Division Multiplexer) for coupling or decoupling the first and second filters. (2) the remote terminal detects an abnormality in the optical line, (3) the network management device sends an alarm command to the line monitoring device connected to the central office, (4) the line monitoring device using the return scattered wave (λ 3 indicated by a dotted line) of a light beam to launch a (λ 3 indicated by solid lines) check the light required for the monitoring and distance measurement in the optical line inspection light (λ 3) performing the track monitoring and distance measurement And (5) transmit the distance measurement result to the network management device. Afterwards ⑥ Using the operating PC, smart phone, etc., the manager can know the position of the optical line with the error.

FIG. 9 is an operational state diagram of an optical line management system according to the present invention when an optical line abnormality occurs.

In the optical network management system according to the present invention, when an abnormality occurs in the optical line, (2) the remote terminal that senses the abnormality sends an alarm to the network management apparatus, and (3) when the network management apparatus transmits a monitoring command to the central office, The remote monitoring terminal transmits a line supervision command to two remote terminals presumed to have abnormality in the optical path between the terminals, calculates the distance in which the two remote terminals generated the abnormality in the optical line, and (6) . After that, the manager can know the position of the optical line with the abnormality by using the (7) operating PC, the smart phone (600), and the like.

Therefore, the optical network management system according to the present invention does not need to separately configure a line monitoring device as in the prior art, but can easily implement an optical network management system by inserting the optical signal transmission / reception and line inspection integration module according to the present invention into an existing remote terminal .

10 Transmitter switching part 12 Transmit signal drive
14 first check signal drive 16 first switch
20 Laser diode 30 Photo diode
40 optical splitter 50 receiving side switching unit
52 Receive Signal Drive 54 2nd Check Signal Drive
56 second switch 60 monitoring control unit
100 The optical signal transmission / reception and line inspection integration module
200 optical multiplexer 300 central office terminal
400 remote terminal 500 network management device
600 smart phone (SMS terminal)

Claims (6)

A module included in a remote terminal of an optical network,
A transmission side switching unit 10 for selectively driving the signal transmission mode and the line checking mode;
A laser diode (20) connected to the transmission side switching unit (10) and modulating an electric signal into an optical signal;
A photodiode (30) for modulating a received optical signal into an electrical signal;
An optical splitter (40) that transmits transmission light or check light received from the laser diode (20) through an optical line and transmits transmission light or check light received from the optical line to the photodiode (30);
A receiving side switching unit 50 connected to the photodiode 30 for selectively driving a signal transmission mode and a line checking mode,
When the line check command is transmitted from the external network management apparatus, the transmission side switching unit 10 and the reception side switching unit 50 are switched to the line checking mode, and the distance from the remote terminal to the point where the optical path abnormality occurs And a monitoring control unit (60) for calculating the optical signal transmission / reception and line monitoring integrated module.
The method according to claim 1,
The transmission side switching unit 10 includes a transmission signal drive 12 for processing a transmission signal in a signal transmission mode, a first check signal drive 14 for processing a line check signal when there is a line check command, (12) and a first switch (16) for switching the first check signal drive (14);
The reception side switching unit 50 includes a reception signal drive 52 for processing a reception signal in a signal transmission mode, a second check signal drive 54 for processing a line check signal when there is a line check command, And a second switch (56) for switching the second check signal drive (52) and the second check signal drive (54).
The optical multiplexing apparatus according to claim 1 or 2, comprising an integrated optical signal transmission / reception and line inspection module (100).
An integrated optical signal transmission / reception and line inspection integration module (100) according to claim 1 or 2.
An optical multiplexer 200 connected to the optical signal transmission / reception and line inspection integration module 100,
And a network management apparatus (500).
The method of claim 4,
Wherein the network management apparatus (500) displays a location where an abnormality of an optical path is generated on a map in which an installation location of the network equipment and the optical line is displayed in cooperation with the geographic information system.
The method of claim 4,
Wherein the network of the optical network management system is a ring topology.
KR1020150104818A 2015-07-24 2015-07-24 Integrated module for optical signal transmission-reception and optical line check, optical multiplexer and optical network management system using the same KR101556499B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114124708A (en) * 2020-08-10 2022-03-01 中国移动通信集团浙江有限公司 Port resource calibration method and device of optical splitter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100610663B1 (en) 2005-07-06 2006-08-11 주식회사 아이센텍이엔씨 System for watching optic fiber using testing wave length
JP2007093405A (en) 2005-09-29 2007-04-12 Anritsu Corp Optical pulse testing device
KR101125342B1 (en) 2011-05-17 2012-03-28 (주) 유식스 Fiber line monitoring method for ring type network and monitoring device
KR101462392B1 (en) 2013-12-30 2014-11-17 전자부품연구원 OTDR having the function of the integrated optical transceiver OSA

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100610663B1 (en) 2005-07-06 2006-08-11 주식회사 아이센텍이엔씨 System for watching optic fiber using testing wave length
JP2007093405A (en) 2005-09-29 2007-04-12 Anritsu Corp Optical pulse testing device
KR101125342B1 (en) 2011-05-17 2012-03-28 (주) 유식스 Fiber line monitoring method for ring type network and monitoring device
KR101462392B1 (en) 2013-12-30 2014-11-17 전자부품연구원 OTDR having the function of the integrated optical transceiver OSA

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114124708A (en) * 2020-08-10 2022-03-01 中国移动通信集团浙江有限公司 Port resource calibration method and device of optical splitter
CN114124708B (en) * 2020-08-10 2023-09-19 中国移动通信集团浙江有限公司 Port resource calibration method and device of optical splitter

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