Optical Monitoring Manufacturer
The intelligent optical monitoring and management system by HYD TECHNOLOGY is an intelligent system for optical cable network maintenance.
It integrates optical cable online monitoring, alarm, fault analysis, and positioning. Real-time intelligent monitoring and maintenance management of network resources.
HYD TECHNOLOGY Optical Monitoring System Features :
- Support Real-time monitoring function Online monitoring, fiber backup monitoring, cross-section monitoring Fiber detection function Fault test, automatic inspection, roll call test function and fault precise location function Optical fiber automatic protection switching function
- Support Optical fiber degradation analysis and alarm function Automatic fault analysis function
- Support Fault alarm and information timely reporting function
- Support Complete optical fiber network data database and information query
- Support Data statistics and reports
- Support System configuration management and log management
- OTDR – Optical Time-Domain Reflectometer Card
OTDR-Optical time domain reflectometer occupies a very important position in the construction, maintenance and testing of optical monitoring , and is one of the indispensable components of optical fiber communication engineering today.
Limited by its own principle and test accuracy, it cannot become the darling of the research field, but it has played a pivotal role in practical applications, especially in the troubleshooting of optical fiber communication network construction.
OCM – Optical Channel Monitoring Card
The structure of traditional OCM is divided into two types, one is based on the principle of radiation, that is, array detectors are arranged behind the diffraction grating for detection; the other is based on the principle of interference, that is, the use of interference to form a filtering effect to detect a single wavelength.
When OCM is working, the mixed wave of multiple wavelengths in the DWDM system enters through the input end, and the MEMS rotating mirror is controlled to perform a full rotation angle.
At the same time, the fixed receiving end performs multiple sampling in time sequence, and each sampling point uses the PIN of the receiving end. The converted photocurrent corresponds to the optical power and is transmitted to an external data processing system for recording and processing.
- Intelligent Optical Monitoring
OTNW7200 IV optical cable intelligent monitoring system adopts high density and high integration design. Provide rich service types and flexible configuration options for optical communication networks.
Support LCD graphical management interface, provide rich network management functions, adopt 1+1 redundant backup power supply design, support 16 function card slots, 1 network management card slot, 1 expansion card slot, support OTDR, OSW, OPD , LSU, OLP and other business function cards.
It is mainly used in optical network fields such as optical transmission, optical protection, and optical cable monitoring.
OSW optical switch from HYD TECHNOLOGY:
programmable, supports time, button and program control multiple switching methods; low insertion loss, low polarization-dependent loss, good channel consistency;
high repeatability, service life of more than 10 million times; short switching time, low In 30ms; platform + modular design; support remote control and other control methods
Modular design, can be flexibly embedded in systems in various fields.
The control method is simple, convenient and easy to control.
LSU light source card, the light source adopts advanced automatic optical power control (APC) technology to ensure high stability of optical power output.
Modular design, reduced size, hot-swappable
Stable output wavelength
LED indicators to display switch status, and user-friendly operation.
The network remote management of the device can be realized through the network management card, and the LCD panel operation is convenient and fast
Remote management protocol support: SNMP, WEB, bbbNET, SSH and other network protocols
Product application: Optical cable detection system, optical cable maintenance system.
OPD optical power acquisition card is a high-performance multi-channel optical power acquisition card.
It is suitable for loss measurement of optical fiber, optical cable, etc., construction and maintenance of optical monitoring system engineering, and real-time monitoring of optical power.
The optical power acquisition card has high measurement accuracy, stability and reliability, and high cost performance. It is an ideal choice for optical cable monitoring systems.
• Modular design, reduced size, hot-swappable
• Support 1310nm, 1550nm dual-window optical power detection
In recent years, optical fiber communication technology has been widely used in communication networks due to its ultra-high-speed, large-capacity, and long-distance transmission functions.
The reliability and security of Optical Monitoring are more and more concerned by people.
As a special instrument for the construction and maintenance of Optical Monitoring projects, the Optical Time Domain Reflectometer (OTDR) is an indispensable testing instrument. ) is clearly displayed on the several-inch LCD screen.
According to the data in the event table, it can quickly find and determine the location of the fault point and judge the nature and type of the obstacle, and can provide accurate data for analyzing the main characteristic parameters of the optical fiber.
OTDR is mainly made according to optical principles and Rayleigh scattering and Fresnel reflection theory.
The laser source of the instrument emits a beam of certain intensity and wavelength to the optical fiber under test. Due to the defects of the optical fiber itself, the inhomogeneity of the manufacturing process and the composition of the quartz glass material, Rayleigh scattering will occur when the light is transmitted in the optical fiber;
Due to reasons such as mechanical connection and breakage, the light will produce Fresnel reflection in the optical fiber, and the weak optical signal reflected from various points along the optical fiber will go through the optical directional coupler to the receiving end of the instrument,;
pass through the photoelectric converter, and the low noise amplifier. , digital image signal processing and other processes to realize charts and curve traces displayed on the screen.
2 The role of OTDR in Optical Monitoring
With its powerful data analysis function, OTDR can accurately locate the event point and fault point in the optical fiber link during the line construction, maintenance test and emergency repair process of Optical Monitoring. Its most important features are:
Single-ended non-destructive test, fast test speed, accurate fault location. At present, OTDR can use wavelengths such as 850nm, 1300nm (for multimode fiber), 1310nm, 1380nm, 1480nm, 1550nm and 1625nm (for single-mode fiber) to measure optical fiber lines.
The focus of the measurement is to verify the fusion of the optical fibers from the central office to the splitter, from the splitter to each user end, the loss of the connector and the line, etc., and to verify whether the distance of each fiber is correct compared with the construction, and it can also speed up future maintenance. Quality confirmation and troubleshooting of optical fiber lines.
The test data given by OTDR has two formats: data sheet and backscatter waveform diagram. We can use the RS232 (serial port) of the OTDR to communicate with the computer, and use the hyperterminal software that comes with the computer operating system to access the OTDR to obtain data.
These test data can not only be used as the initial data of optical monitoring construction, but also can be used to establish a comprehensive report for future completion acceptance.
2.1 Test of OTDR in the construction and maintenance of Optical Monitoring lines
As we all know, optical fiber is much better than cable in terms of environmental adaptability due to its light weight, corrosion resistance, and immunity to electromagnetic interference. The quality of optical fiber lines depends on the quality of optical fiber and the construction process.
According to the structure of the optical fiber, as long as the construction of the optical fiber is strictly in accordance with the specifications, the probability of the optical fiber being damaged is very small.
Once the optical fiber is constructed, it is necessary to use OTDR to understand the condition of the optical fiber line, which cannot be known through human eyes. Therefore, in the maintenance and operation of optical fiber lines, it is very important and necessary to use OTDR to test the optical fiber link.
OTDR generally conducts four tests during the optical fiber construction process: incoming material test, pre-splicing test, post-splicing test, and post-construction acceptance test.
(1) Before the optical fiber is laid, each fiber in the optical fiber must be tested first, because the optical fiber is transported from the factory to the buyer’s unit and then transferred to the construction site. After many times of loading and unloading, it is difficult to guarantee the quality of the optical fiber. No damage.
Therefore, the function of testing the optical fiber before deployment is to draw a clear line of responsibility, that is, to ensure that the optical fiber is good before construction. From a maintenance operations perspective, testing serves two purposes:
One is to ensure that the optical fiber is not damaged due to construction,
The second is to determine the length of the fiber optic cable to avoid insufficient length.
(2) Retesting must be carried out after the fiber is laid and before splicing. This is because with the advancement of science and technology, the quality of the fusion splicing machine has been greatly improved, so that the loss of the fusion point is no longer the main factor for the loss of the optical fiber line.
Due to the small splice loss, after the optical signal passes through this point, the change of optical power is not obvious. It is not easy to judge it when testing with OTDR, and it is not easy to find the splice point in the test curve of the optical fiber link, which will be in the future. There are many inconveniences in operation and maintenance:
One is that when performing line maintenance, it is difficult to pick materials because we do not know how long the section of optical fiber is;
The second is that it is not easy to reconnect the line. Generally, the reconnection point should be selected at the joint position. Because the welding point is not obvious in the curve, it may not be possible to reconnect because the welding point cannot be found.
Therefore, testing again before connecting can prevent such problems from happening, and at the same time, it can also verify that the optical fiber does not cause damage to the optical fiber when it is armed.
The pre-connection test is the same as the general OTDR test method, except that before the fiber is connected, the tested fiber length and loss data are stored first, and a database of line segment length and loss is established to serve as an important reference for future line maintenance.
(3) It is necessary to use OTDR to test again after the fiber is fused. This test has two functions:
One is to test whether the fusion loss of the welding point exceeds the specified requirements.
Once the excess point is found, it can be re-spliced in time.
The second is to test and compare the core wire of the optical fiber, because it is difficult to guarantee that the optical fiber with hundreds of cores will not be wrongly spliced.
There are many splicing points in the optical fiber link. Generally speaking, there are two reasons for splicing points that exceed the standard in the link:
One is the reason for the optical fiber, that is, the difference in the numerical aperture of the optical fiber at both ends of the splicing point is too large, which may be caused by different manufacturers. However, with the advancement of optical fiber manufacturing technology, the difference in this respect has become smaller and smaller;
The other is the reason of welding, which is caused by human negligence or failure of welding machine. When using OTDR to determine the unqualified splicing point in the optical fiber link, it must be carefully tested and judged carefully, and the unqualified point must be taken seriously, otherwise, this point may be the most direct cause of the rapid deterioration of the entire optical fiber link.
(4) After the optical fiber project is completed, the final test of the line is required. The construction party’s test is mainly to perform self-test, self-inspection, and self-inspection on the optical fiber link.
The test data can be used as a reference for subsequent acceptance. The acceptance party’s test mainly According to the standard requirements, the acceptance test is carried out on the length, link loss and joint loss of the optical fiber link, and the database of the test data is established as an important reference for future operation and maintenance.
The final test can also be carried out with the help of three instruments: light source, optical power meter and OTDR. The first two are used to test the loss of the optical signal when it is transmitted in the actual link, and the OTDR is used to find out the bad parts in the link. Welding point and geographical location.
2.2 OTDR finds and locates fault points in Optical Monitoring
Any failure in the optical monitoring network may be fatal, which can lead to interruption of transmission and bring huge losses to users.
Therefore, on the one hand, it is necessary to minimize the hidden dangers of failure, and on the other hand, it must have the ability to quickly deal with failures.
Practical experience shows that using OTDR to comprehensively analyze data can find and locate fault points at the fastest speed, which provides strong support for speeding up fault processing and ensuring normal transmission of the network.
In order to find the fault point as quickly as possible, the following points should be done:
(1) The cause of optical fiber failure is often not as simple as the fiber cut caused by an accident, which makes it relatively difficult to find the fault point.
In most cases, the failure of the optical fiber is often caused by a variety of factors, such as the optical cable being immersed in water, the influence of thermal expansion and contraction on the optical fiber, the extrusion of the protective groove in the splice box, the loosening of the optical fiber coupler, dust in the optical fiber head, moisture corrosion, etc. Signal transmission quality degradation or signal interruption caused by it.
In order to quickly and accurately find the fault point and quickly deal with obstacles, it is necessary to comprehensively and comparatively analyze the waveform diagrams first, and then complete the obstacle treatment work.
(2) When the OTDR tests the fiber, it cannot respond to the measurement of the fiber loss within a certain range, which is called a blind zone, mainly due to the optical pulse width of the OTDR and the output port of the OTDR and the first active connector of the fiber under test. caused by Fresnel reflection.
When the optical pulse width is constant, the first active connector connected with the optical fiber under test becomes the key to overcome the blind zone.
In engineering practice, we use the method of adding a 5-10 meter test optical jumper between the tested optical fiber and OTDR to overcome the blind area of OTDR.
In this way, because the Fresnel reflection generated by the first connector is constant, it can not only overcome the blind zone generated by the active connector, but also make the first active connector generate another independent event, which can be more convenient for custom analysis, so that The testing process included the first live connector, providing more accurate data for locating the point of failure.
(3) OTDR provides automatic measurement, manual measurement and optical fiber end measurement methods at the same time. When troubleshooting, multiple measurement methods should be used to test.
Automatic measurement can analyze the entire transmission event in detail, while end measurement can be omitted.
In the middle section of the transmission event, the distance and loss at both ends of the optical fiber are directly measured.
They complement each other and are of great help in locating the fault point.
2.3 Use the OTDR output function to establish a complete preliminary test data and completion report
The accuracy and perfection of the initial data of the optical fiber communication project is related to the process and development of the entire project. The original static two-dimensional table depicting the route length and continuous quality has been unable to meet the development needs of the growing optical fiber communication network.
Therefore, first, use the printing function of the OTDR software to print or save the waveform diagram and data table in the computer at the same time in bitmap format.
Second, it is saved in the computer in the proprietary format of the OTDR software, and is linked to the two-dimensional data table in the form of a “hyperlink” as an electronic aid to the data table, and dynamic comparative analysis can be performed when dealing with faults.
Third, use the accurate data obtained by OTDR testing to combine with construction drawings to draw a schematic routing diagram. The actual location of the connection must be marked in the schematic diagram, and the important event points from the OTDR test must be marked, and the design length must be corrected.
The continuous development of optical monitoring technology has gradually increased the demand for data backhaul services and gigabit optical fiber Ethernet services.
Testing and acceptance for the party with such needs, or directly carrying out engineering construction for it has already been carried out in the optical fiber communication industry.
Using OTDR test data to create acceptance or completion reports not only makes the reported data more accurate and complete, but also makes the report more authoritative and convincing, providing strong support for the development of optical fiber communication projects.
HYD Technology’s OTDR is used in association with optical communication networks, and it helps to find the faults and events that occur along a fiber link. It is used widely to inspect the data links in fiber optic cables.
This monitor by HYD Technology carries out the task of measuring the information present in the DWDM optical transmission system. It is done to carry out the monitoring of the signal dynamics. At the same time, it determines the system’s functionality and performance changes, optimizing the operational performance.
If any enquiry ,please contact HYD TECHNOLOGY .
Optical monitoring is one of the signs that the WDM (Wavelength Division Multiplexing) system is becoming intelligent and high-speed.
WDM systems often cause wavelength and power offsets due to signal damage and nonlinearity in optical fiber transmission, resulting in QoS (Quality of Service) degradation.
The WDM system with OCM (Optical Channel Monitor) can effectively monitor the information of all channels at each node, so as to facilitate system feedback, flexibly correct the channel wavelength, adjust the power, and realize intelligent transmission.
The function of OCM in the WDM system is also Gradually transform from a support module to a transmission module, which will surely become an indispensable part of the transmission process in the future.
HYD TECHNOLOGY is Spelized at Optical Monitoring System and Solution
Combined with the geographic information system, to get a comprehensive understanding of the real distribution of the optical network.
A comprehensive grasp of optical network communication resources, routing resources, and optical cable pipeline resources provides a true and reliable decision-making basis for the operation design, planning, development, and guarantee of optical networks.
Establish a complete and comprehensive optical network data database to give full play to the resources of the optical network and improve the efficiency of the optical network.
Give full play to the resources of the optical network and improve the efficiency of the optical network.
Creat Your Optical Monitoring System from HYD TECHNOLOGY
Solve the problem that the test cycle is too long and the real-time performance of optical cable data is poor
Solve complex data management and limited work support
To solve the passive control of resources, it is difficult to realize “prevention first”
Solve the automatic switching of the main and backup channels of the optical transmission system to ensure the smooth operation of the optical fiber network, and at the same time perfectly and seamlessly integrate with the optical cable monitoring system
Establish a comprehensive optical fiber network management system to scientifically and comprehensively manage the planning, construction, maintenance and use of optical fiber networks.
Establish a fiber optic network resource management platform to manage the routing resource line resources and communication capacity resources of the fiber optic network, and give full play to the use efficiency of the existing fiber optic network.
Establish an online optical monitoring system for optical fiber networks, improve network maintenance levels, reduce fault interruption time, improve fault response speed, improve network maintenance levels, and reduce network maintenance costs.
Establish a system distributed operation system and related standards, realize centralized management of optical fiber network and multi-level access of maintenance units, reduce management levels and links, and meet the needs of information construction
Establish an optical fiber network business communication guarantee system to realize timely recovery of business communication after an optical cable failure
Solve the inability to intuitively understand the real-time operation status of the comprehensive optical network Solve the annual manual test work of the status of the fiber core (used fiber core and spare fiber core) of the fiber optic network cable.