CN103916182B - Submarine communication optical fiber monitoring method - Google Patents

Abstract

The invention discloses an on-line monitoring method for submarine communication optical fibers. In the invention, spare optical fibers of submarine optical cables are circuitously connected in series, and an optical sending and receiving unit is added to a substation at one of the landing points of the submarine optical cables, and the circuitously serially connected The combined submarine optical fiber is connected to the optical sending and receiving unit through the terrestrial optical fiber to form an optical virtual monitoring circuit, and is connected to the communication network management system through the internal network of the power system. The remote network element for virtual submarine optical fiber monitoring is configured, and the relevant submarine optical fiber remote monitoring slot module and the corresponding topology diagram interface are configured to realize real-time monitoring and management of the operation status of the submarine optical fiber.

Description

On-line monitoring method of submarine communication optical fiber

technical field

The invention relates to a communication optical fiber online monitoring method, in particular to a submarine communication optical fiber online monitoring method.

Background technique

While transmitting electric energy, the photoelectric composite submarine cable also serves as a power communication channel to transmit real-time operation information of the power grid such as scheduling automation. Compared with terrestrial optical cables, submarine cables, the operating environment of optical fibers is even harsher. Submarine cables cross the Haitan Strait, with rapid water depth, busy channels, and complicated sea conditions; The impact on the operation of the submarine cable cannot be ignored; in the traditional way, the composite submarine cable, especially the relatively fragile submarine optical cable, is more likely to be damaged by anchoring, anchoring, fishing, ship towing, shore-based operations, etc. Fiber core interruptions occur from time to time during operation, and the actual state of the precious subsea spare fiber core cannot be known in time only by the inspection cycle once every six months. Interruption will endanger the safety and smoothness of grid communication.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the prior art, and provide an on-line monitoring method of submarine communication optical fiber capable of timely monitoring the spare optical fiber of the submarine optical cable.

A submarine communication optical fiber online monitoring method is characterized in that: 1. The spare optical fiber between the two landing points of the submarine optical cable is circuitously connected in series; 3. Then connect the optical communication transmission equipment with the optical communication network management system through the communication network, and monitor the remote network element and virtual communication link real-time monitoring program through the virtual submarine optical fiber set in the optical communication network management system , and configure the relevant submarine optical fiber remote monitoring slot module and the corresponding topology interface to monitor the self-sending and self-receiving virtual communication link set on the virtual submarine optical fiber monitoring remote network element in real time. When the submarine optical fiber is abnormal or interrupted, Send out a warning signal.

Roundabout series connection refers to connecting the spare optical fibers of the submarine optical cable between the two landing points in series. Most of the optical fibers are spare, and the present invention utilizes this spare optical fiber to carry out on-line monitoring, and connecting the spare optical fibers in detour is exactly to arrange multiple spare optical fibers in parallel in the submarine optical cable (if there are N spare optical fibers, each The length of an optical fiber is L) The first fiber is connected to the tail end of the second fiber, the second fiber is connected to the head end of the third fiber, and the tail end of the third fiber is connected to the tail end of the fourth fiber. The head ends of the four fibers and the head end of the fifth fiber are connected in such a way that multiple spare optical fibers are connected in sequence, so that the multiple spare optical fibers are serially connected into an optical fiber with a length of N*L.

The optical communication transmission equipment is the optical communication transmission equipment in the substation near the landing point of the submarine optical cable.

The optical communication network management system is the optical communication network management system of the power center computer room corresponding to the substation.

The selection of the optical sending and receiving unit is: according to the number of optical fibers contained in the submarine cable between the two landing points of the submarine optical cable and the length of the optical fiber, the maximum transmission length required by the optical path is obtained, and there is sufficient optical power reserve at the end of the transmission optical path. Select the appropriate optical sending and receiving unit under the circumstances.

The choice of the number of spare optical fibers that can be connected in series is as follows: the optical transmitting and receiving unit, according to the technical index of optical loss per 100 kilometers, and combined with the receiving sensitivity of the optical transmitting and receiving unit, calculates all the optical fibers including the land optical fiber from the landing point to the substation. The total length of the optical fiber that can be connected, and then calculate the number of optical fibers of the submarine optical cable that can be circuitously connected by the length of the optical fiber between the two landing points of the submarine optical cable.

Determination of the number of optical sending and receiving units required for the submarine optical cable between two landing points: determine the number of optical fibers of the submarine optical cable that may be connected in detours and deduct the number of optical fibers occupied by the communication channel used to determine the distance between the two landing points The number of optical sending and receiving units required for submarine optical cables.

The present invention monitors the online monitoring method of the submarine communication optical fiber. The spare fiber core of the optical cable between the two landing points of the submarine optical cable is wound in series according to a predetermined plan, and forms a closed-loop optical fiber circuit with the land OPGW optical fiber, and accesses the communication near the landing point nearby. The optical sending and receiving unit of the transmission equipment. According to technical indicators such as optical loss per 100 kilometers, the maximum transmission optical power and reception sensitivity of the optical transmission and reception unit, calculate the total length of optical fiber access. On-site tests at the landing point of the submarine optical cable adjust the number of cores connected to the submarine optical fiber, so that the optical signal sending and receiving unit reaches the critical receiving alarm state, that is, maintaining the proper optical power reserve and meeting the appropriate monitoring sensitivity requirements. When the abnormal optical loss increases or is interrupted in the submarine optical fiber, the optical transmission equipment will send out the alarm signal of the increased or interrupted loss of the received optical signal immediately (the alarm light flashes and the alarm sounds). In order to facilitate the communication personnel to timely discover the abnormal fault of the submarine optical cable, the alarm signal of the optical signal sending and receiving unit of the substation communication equipment is transmitted to the network management system of the power dispatching communication room of the substation through the power communication network to realize remote monitoring and management. And the corresponding submarine optical fiber monitoring topology diagram is established on the display screen of the communication management system, which can conveniently and intuitively display the operating status of the submarine optical fiber, and achieve the expected results of remote uninterrupted online real-time monitoring of the operation of the submarine optical cable.

An on-line monitoring device for submarine communication optical fiber. The optical transmission equipment connected to the land optical fiber, the optical transmission equipment is connected to the optical fiber through the optical sending and receiving unit on it, and the optical transmission equipment is connected with the submarine optical fiber remote monitoring device. Communication link module, submarine optical fiber monitoring remote network element module, alarm module, data processing and display unit module, self-generating and self-receiving communication link module, submarine optical fiber monitoring remote network element module and data processing display unit module and alarm module through the adapter interface Corresponding to the communication connection, the submarine optical fiber remote monitoring device is also provided with a submarine optical cable monitoring topology map module for visually monitoring the long-distance travel of the submarine optical cable and communicating with the data processing and display unit.

In the present invention, the spare optical fibers of the submarine optical cable between two landing points are circuitously connected in series, and the two ends of the optical fibers connected in series are connected with the optical sending and receiving unit arranged on the optical transmission equipment near one of the landing points , and communicate with the submarine optical fiber remote monitoring device through the optical transmission equipment, and realize the online monitoring of the submarine optical cable through the submarine optical fiber remote monitoring device.

The optical transmission equipment is to directly use the optical transmission equipment in the substation near one of the landing points.

Directly using the optical transmission equipment in the substation can make full use of the existing power resources and receive the greatest effect with the least investment.

The submarine optical fiber monitoring remote network element module is a virtual submarine optical fiber monitoring remote network element module.

The self-sending and self-receiving communication link module is a virtual self-sending and self-receiving communication link module.

The submarine optical fiber remote monitoring device is a corresponding optical communication network management system connected to the substation, and the self-sending and self-receiving communication link module and the submarine optical fiber monitoring remote network element module are directly using the optical communication transmission network management system The developed self-sending and self-receiving communication link module, the submarine optical fiber monitoring remote network element module, the data processing and display unit module and the alarm module are built with the optical communication transmission network management system, and also use the optical communication transmission network management system The public service components, development and maintenance management tools, the submarine optical fiber remote monitoring slot module and the corresponding submarine optical cable monitoring topology map module are set in the man-machine interface part.

The spare optical fiber of the submarine optical cable is provided with more than one roundabout series connection loop, and more than one optical sending and receiving units corresponding to the roundabout series connection loop are arranged on the optical transmission equipment of the substation near the landing point.

The optical sending and receiving unit installed on the optical transmission equipment is to insert an optical board into a groove of the optical transmission equipment. The circuitous connection of the spare optical fiber of the submarine optical cable is connected through the optical fiber access unit box.

The monitoring process of the virtual submarine optical fiber remote monitoring system is that the virtual network element sends a test signal to the monitored communication link, and at the same time the monitoring process starts, waiting to receive the test signal looped back on the virtual communication link that is sent and received by itself. If the test signal is not received within the delay range, or the bit error rate of the received test signal is too high, it is determined that the monitored submarine optical fiber channel is abnormal, and the system sends out a corresponding alarm message and audio prompt; otherwise, the system considers the channel to be operating normally, and the program returns In the initial stage, the virtual network element resends the test signal to continue monitoring the monitoring link.

In summary, compared with the prior art, the present invention has the following advantages:

In the present invention, the spare optical fibers of the submarine optical cable are circuitously connected in series, and an optical transmitting and receiving unit is added on the substation at one of the landing points of the submarine optical cable, and the submarine optical fibers connected in circuitous series are connected to the optical transmitting and receiving unit through the land optical fiber. connected to form an optical virtual monitoring circuit, and connected to the communication network management system through the internal network of the power system. At the same time, a virtual submarine optical fiber monitoring remote network element is also configured in the communication network management system of the communication room of the power company, and related The submarine optical fiber remote monitoring slot module and the corresponding topology interface realize real-time monitoring and management of the operation of the submarine optical fiber. Based on the existing conditions, the present invention fully utilizes the existing network and communication resources according to local conditions, and has the characteristics of low production cost, quick results, and convenient implementation. .

Description of drawings

Fig. 1 is a system block diagram of a submarine communication optical fiber real-time monitoring device according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of the layered and componentized software system of the optical communication network management system of the present invention.

Fig. 3 is a monitoring flowchart of the virtual submarine optical fiber remote monitoring system.

detailed description

The present invention will be described in more detail below in conjunction with examples.

Example 1

An online monitoring method for monitoring submarine communication optical fibers, 1. First, obtain the maximum transmission length required by the optical path according to the number of optical fibers contained in the submarine cable between the two landing points of the submarine optical cable and the length of the optical fiber, and ensure that the end of the transmission optical path has In the case of sufficient optical power reserve, select the appropriate optical sending and receiving unit. 2. From the optical sending and receiving unit, according to the technical index of optical loss per 100 kilometers, combined with the receiving sensitivity of the optical sending and receiving unit, calculate the distance between the landing point and the substation. The total length of the optical fiber that can be connected including the terrestrial optical fiber, and then calculate the number of submarine optical fiber cables that can be connected in roundabout series based on the length of the optical fiber between the two landing points of the submarine optical fiber cable, and the number of submarine optical fiber cables that can be connected in roundabout series Determine and deduct the number of optical fibers occupied by the communication channel used to determine the number of required optical sending and receiving units 3. Add the required optical sending and receiving units to the optical communication transmission equipment of the substation near one of the two landing points of the submarine optical cable, 4 1. Connect the subsea optical fiber included in each optical sending and receiving unit in roundabout way, and connect the two ends of the connected optical fiber to the optical sending and receiving unit through the land optical fiber respectively. 5. The corresponding communication network management system in the substation In addition, virtual submarine optical fiber monitoring remote network elements and virtual communication link real-time monitoring programs are added, and relevant submarine optical fiber remote monitoring slot modules and corresponding topology diagram interfaces are configured, and virtual communication link real-time monitoring programs are used to remotely monitor virtual submarine optical fiber monitoring. The self-sending and self-receiving virtual communication link set on the network element is used for real-time monitoring, and when the submarine optical fiber is abnormal or interrupted, an alarm letter is sent.

The on-line monitoring device of the submarine communication optical fiber shown in Figure 1-3 includes a plurality of spare optical fibers between the two landing points of the submarine cable connected in series, and an optical transmission installed at one of the two landing points of the submarine cable. More than one optical sending and receiving unit on the equipment, the two ends of the submarine optical fiber connected in series are connected to the optical sending and receiving unit through land optical fiber to form more than one monitoring loop, and at the same time in the optical communication network management system corresponding to the substation A virtual submarine optical fiber remote monitoring system is set, and the submarine optical fiber remote monitoring system includes virtual submarine optical fiber monitoring remote network element components and virtual communication link components that are set in the optical communication network management system and self-sending and self-receiving virtual communication link components, and prepare corresponding and The existing components in the optical communication network management system communicate with the adapter interface, and the corresponding topology map interface of the submarine optical fiber remote monitoring slot module is configured in the man-machine interface part of the optical communication network management system. The optical sending and receiving unit installed on the optical transmission equipment is to insert an optical board into a groove of the optical transmission equipment. The monitoring process of the virtual submarine optical fiber remote monitoring system is that the virtual network element sends a test signal to the monitored communication link, and at the same time the monitoring process starts, waiting to receive the test signal looped back on the virtual communication link that is sent and received by itself. If the test signal is not received within the delay range, or the bit error rate of the received test signal is too high, it is determined that the monitored submarine optical fiber channel is abnormal, and the system sends out a corresponding alarm message and audio prompt; otherwise, the system considers the channel to be operating normally, and the program returns In the initial stage, the virtual network element resends the test signal to continue monitoring the monitoring link.

The parts not described in this embodiment are the same as the prior art.

The following is the application of the present invention in actual production.

(1) Selection of optical sending and receiving unit

The length of the photoelectric composite submarine cable from Fuqing Kemen Port to Pingtan Daojia Island is 3.5km. Submarine cable A, B, C three-phase composite 16-core optical fiber in each phase, a total of 48 cores. If all the optical fibers in the three phases of A, B, and C of the submarine cable are connected back and forth in series, the length can reach:

16 * 3 * 3.5km = 168km

The length from the knife holder island to the forward variable OPGW is 14km. Connect the 48 optical fibers of the submarine cable connected in series with the end-to-end connection between the knife post island and the forward substation OPGW, and the maximum transmission optical path length is obtained:

168km + 2 * 14km = 196km

The composite optical fiber in the submarine cable is a G.652 single-mode optical fiber. The light attenuation characteristic coefficients of light waves with wavelengths of 1310nm and 1550nm propagating in this type of fiber are as follows:

Fiber attenuation coefficient: a1£ 0.34dB/km 1310nm (average);

a2 £ 0.36dB/km 1310nm (maximum value);

a1 £ 0.20dB/km 1550nm (average value);

a2 £ 0.21dB/km 1550nm (maximum).

Joint attenuation coefficient: £ 0.05dB/piece (two-way average value)

Since the submarine optical fiber real-time monitoring system developed by this project aims to judge the status of the optical fiber by monitoring the on-off of the optical path, there is no specific business data transmission in the optical path used, so the dispersion generated during optical transmission has a great influence on the normal operation of the system. No noticeable effect. The optical attenuation, as an important factor in determining the optical power reserve, needs to be considered emphatically. The maximum transmission length of the monitoring optical path is 196km, and light waves with small optical attenuation and long relay distance should be selected as far as possible to ensure sufficient optical power reserve at the end of the transmission optical path. Light waves with a wavelength of 1550nm meet the above conditions.

Pingtan 110 kV forward substation has been equipped with Huawei OSN2000 SDH optical transmission equipment. In order to ensure sufficient optical power reserve at the end of the long-distance transmission optical path, long-distance optical boards should be selected. No service data is transmitted in the monitoring optical path, and there is no requirement for bandwidth, so an optical board with a transmission rate of 155Mbps is sufficient. The L1.2 optical board is a long-distance board with a bandwidth of 155Mbps and a wavelength window of 1550nm. The luminous power is 0~-5dBm, and the light receiving sensitivity is -30dBm, which can meet the above requirements.

(2) Theoretical calculation of the number of fiber cores connected in series

The model of the newly added optical sending and receiving unit on OSN2000 of Pingtan 110kV forward transformer SDH optical transmission equipment has been selected as L1.2, and now it can be calculated according to the technical index of optical loss per 100 kilometers and combined with the receiving sensitivity of the optical unit Calculate the total length of the fiber that can be accessed including the land part of the tool post island to the OPGW fiber of the forward transformation, so as to determine the number of fiber cores connected in series.

The length of the submarine cable from Fuqing Kemen Port to Pingtan Daojia Island is 3.5km, and the length from Daojia Island to Qianjin Submarine OPGW is 15km. Considering the loss caused by fiber cable and construction process, the fiber specification is G.652, and the optical attenuation per 100 kilometers of light with a wavelength of 1550nm is calculated as 0.25dB. The light attenuation at each enamel head is calculated by 0.05dB. The luminous power of the optical sending and receiving unit configured in the forward change is -5dBm, and the receiving sensitivity is -28dBm. The calculation formula for the number of cores n of optical fibers that can be connected in series is:

(3.5km * n + 15km * 2) * 0.25dB/km + (n + 1) * 0.05dB/km < 28dBm – 5dBm

It is calculated that n ≤ 17, then the theoretical value of the maximum number of fiber cores that can be connected in series is 17.

(3) Light receiving sensitivity adjustment

Landing points on both sides of the submarine optical cable: the access box of the submarine optical fiber monitoring unit in Kemen Port of Fuqing and Pingtan Daojia Island, and the optical transmission equipment of 110 kV forward transformation, comprehensively use light source, optical power meter, OTDR and network management The system conducts on-site testing and joint debugging to determine the optimal number of access fiber cores.

Based on the theoretical value of the calculated maximum number of fiber cores for round-trip serial connection as the initial number, the number of cores of submarine optical fibers connected to the monitoring system is gradually reduced. Through repeated trials and adjustments, it is found that when the number of fiber cores connected to the system is greater than 12, the optical power reserve at the end of the optical path of the monitoring system is insufficient. The optical attenuation received by the optical receiving unit fluctuates with changes in external conditions such as seawater tides, the monitoring system is prone to false alarms, and the equipment is unstable. When the number of fiber cores connected to the system is less than 12, the optical power reserve at the end of the optical path of the detection system is too large. When there is an abnormality in the optical path, there is still a certain degree of redundancy in the receiving power of the monitoring system, and it is impossible to give an alarm in time. To sum up, it can be concluded that the optimal number of access fiber cores taking into account the requirements of optical power reserve and receiving sensitivity is 12.

(4) Submarine optical fiber monitoring network element configuration

Select Huawei OSN2000, an existing optical transmission equipment in the forward transformation, as the access network element for optical fiber monitoring. Configure two L1.2 optical boards, insert them into the 9th and 10th slots respectively, and use them as optical sending and receiving units to monitor the optical fiber of the above-mentioned submarine optical fiber monitoring loop 1 and submarine optical fiber monitoring loop 2 respectively. In the central computer room of Pingtan County Dispatching Master Station, the forward transformer equipment is configured through the transmission network management.

In order to facilitate the communication maintenance personnel to monitor and manage the operation of the submarine optical fiber nearby, this project develops a virtual submarine optical fiber monitoring remote network element in the network management system, connects it to the forward transmission equipment, and configures the relevant submarine optical fiber network element monitoring slot module and the corresponding topology map interface. And for the developed virtual monitoring remote network element, configure the spontaneous self-return circuit according to Table 1.

serial number capacity level direction source network element source port Sink network element sink port Remark 1 155Mbps dual-fiber bidirectional 3205-Forward to OSN2000 9-SL1-1 3205-Forward to OSN2000 9-SL1-1 Virtual Monitoring Link 1 2 155Mbps dual-fiber bidirectional 3205-Forward to OSN2000 10-SL1-1 3205-Forward to OSN2000 10-SL1-1 Virtual Monitoring Link 2

Table 1 Optical Fiber Monitoring Link Service Configuration Table

(5) Alarm mode design

The submarine optical fiber monitoring system compares the optical power reserve value received by the Pingtan forward variable optical receiving unit with the optical power reserve range set in the network management system. When the optical attenuation of the monitoring link increases, the optical receiving unit The received optical power reserve is less than the system setting value, and the monitoring system determines that an abnormality occurs on the link. On the topology diagram of the monitoring system, the virtual submarine optical fiber monitoring remote network element name mark appears a flashing alarm. Under the "Real-time Alarm Information" option in the right-click menu, you can query the optical sending and receiving unit that issued the alarm and the specific alarm content. Alarm information appears in the real-time alarm window, including the network, network element name and number, alarm content, alarm category, and alarm sending time. At the same time, it is accompanied by an audio warning prompt.

Claims (2)

1. null1. the on-line monitoring method monitoring submarine communication optical fiber，It is characterized in that: 1、It is serially connected roundabout for the spare fibre between submarine optical fiber cable two debarkation point，2、The two ends of the optical fiber being serially connected send reception unit with the light on optic communication transmission equipment be connected，3、Then optic communication transmission equipment is connected with optical communication network management system by communication network，Virtual seabed fiber monitoring remote network element and virtual communication link by arranging in optical communication network management system monitor program in real time，And configure relevant seabed fiber and remotely monitor groove position module and corresponding topo graph interface，The virtual communication link of the internal loopback arranged in virtual seabed fiber monitoring remote network element is monitored in real time，When seabed fiber is abnormal or interrupts，Send warning signal，Described optic communication transmission equipment is the optic communication transmission equipment in the transformer station near submarine optical fiber cable debarkation point，The described optical communication network management system that optical communication network management system is the power center machine room corresponding with transformer station，Light sends and receives being chosen as of unit: according to the number of fibers contained by the submarine cable between submarine optical fiber cable two debarkation point、The length of optical fiber draws the maximum transmitted length needed for light path，Ensureing that selecting suitable light to send in the case of transmission optical line terminal has enough luminous power deposits receives unit，Being chosen as of the quantity of series connected spare fibre: sent by light and receive unit，According to per 100 km light loss technical specification，And combine the receiving sensitivity of light transmission reception unit，Calculate the optical fiber total length that can access including debarkation point to transformer station's land optical fiber，Being calculated by the fiber lengths between submarine optical fiber cable two debarkation point can the quantity of submarine optical fiber cable optical fiber of roundabout concatenation again.
2. The on-line monitoring method of monitoring submarine communication optical fiber the most according to claim 1, it is characterised in that: the light transmission being equipped with required for the submarine optical fiber cable between two debarkation points receives the quantity of unit and determines: determine that between two debarkation points, required for submarine optical fiber cable, light sends the quantity of reception unit by the number of fibers shared by the communication port that quantity the deduction of the submarine optical fiber cable optical fiber of possible roundabout concatenation have used.