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What is meant by attenuation in optical fiber?
When an optical signal of a given wavelength travels in the fiber it looses power. The amount of loss of power per Km length of fiber is called its attenuation. A=10*LOG10(POUT/PIN) dB/Km Where POuT is optical power after 1 Km PIN is th epower launched in the Fiber.
What is meant by attenuation in Optical Fiber Communication?
When an optical signal of a given wavelength travels in the fiber it looses power. The amount of loss of power per Km length of fiber is called its attenuation. A=10*LOG10(POUT/PIN) dB/Km Where POuT is optical power after 1 Km PIN is th epower launched in the Fiber.
How do you launch optical power into a particular fiber from some type of luminescent source?
first of all we should know the coupling efficiency. suppose that the Pf is the power coupled into a fiber and Ps is the power from the led source , then the efficiency is give by Pf / Ps. it also depends on the radius of the recipient fiber core. The launching of optical power into a fiber also depends on the type of led we are considering.
What is meant by atenuation in fiber optics?
Attenuation in fiber means 'loss of optical power' suffered by the optical signal in fiber itself.
What are optical fiber sensors used for?
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What about Cable Monitoring System?
GLSUN optical cable monitoring system, combined with OTDR, optical switch, and upper-level network management software, form a systematic and intelligent system integrating functions of testing, analysis, alarm, positioning, information management, and worksheet. It features high integration density, strong commonality, abundant product form, and flexible upgrading and expansion. Fiber In-Service Monitoring Light sources of different wavelengths will not interfere with each other in the transmission process in optical fiber. Based on this principle, we combine the service light [wavelength 1550] and test light [wavelength 1650] for transmission, so that the quality of optical fiber can be monitored without interruption of service. Spare Fiber Monitoring Spare fiber monitoring is to inject the monitoring signal into the spare fiber and indirectly observe the loss of other fiber in the cable by monitoring the loss of the spare fiber. Since the monitoring signal goes through the spare optical fiber, passive device such as filter is not required, which can effectively reduce the installation process and cost of the system. Fiber Out-of-Service Monitoring Optical fiber out-of-service monitoring refers to monitoring the original communication optical fiber in the condition that communication equipment is interrupted. Therefore, passive devices such as filter are not required, which can effectively reduce the installation process and system cost of the system. The disadvantage is that communication equipment needs to be interrupted. Application: Optical switch + OTDR Monitoring Scheme Optical power monitoring scheme can monitor the total loss of optical fiber, but it can not reflect the loss performance of optical fiber, nor can it find the fault of optical fiber. While OTDR can monitor the loss performance of the fiber. It can find the failure type and accurately by analyzing the OTDR curve. Since OTDR costs are relatively high, optical switch is needed to switch to different optical fibers, so as to reduce the cost of the whole system. By controlling the 1xN optical switch, the control unit starts the OTDR to test the optical fiber loss performance in turn. By analyzing the test curve of OTDR, the purpose of optical fiber monitoring is achieved. Application: Optical Power Detector + Optical Switch + OTDR Monitoring Scheme This scheme can effectively solve the problem of poor timeliness for fault report of optical switch + OTDR scheme. The optical power detector monitors the total loss of the optical fiber in real-time. If any abnormality is found, the control unit is informed to start and switch to the abnormal optical fiber and conduct OTDR fiber performance test. The alarm type and will be identified by analyzing OTDR curve. The control unit can also control the OTDR and optical switch for periodic tests and roll call tests. However, this scheme still has the problem of poor timeliness caused by OTDR polling in case of abnormality of multiple monitored fibers. Application: PON + Optical Switch + OTDR Monitoring Scheme With the development of FTTX, PON network monitoring and maintenance has been mentioned on the agenda by telecom operators or special network users. Glsun developed high sampling accurate OTDR module for PON monitoring. Reference from www dot glsunmall dot com
What is an explanation of what an OTDR represents?
An Optical Time Domain Reflectometer (OTDR) is a testing and troubleshooting device used to evaluate a fiber optic cable's performance, including optical loss, chromatic dispersion, and attenuation. OTDRs are used to determine the location(s) of events on the cable, including faults, reflectors, and splices. A smart OTDR does at least one of three things: adjusts its test power to match the power at the test point, has an auto-ranging function so the operator does not have to enter the optical power at the test point, or can store the optical power at multiple points on the cable, so the operator can then retrieve and compare those values. Contact at: +91 8910812633
What are the names of the fiber optic network cables?
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What does optical power mean?
optical power means living
What is the relation between coupling efficiency and numerical aperture of optical fiber?
Coupling efficiency = NA2 such that if you have an initial power output P0 you get P=P0*NA2
What tool can you use to test a fiber optic cable?
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What is Fiber Optical Cable Monitoring System?
Introduction The fiber optical cable monitoring system monitors the fiber optical cable and then judges whether the optical cable is in normal operation; when the abnormal situation occurs, alarms will be issued and corresponding tests will be sent. In addition, through the judgment of fault data the position where fault occurred can be accurately located, the faulty equipment and the reason causing the fault can be quickly ascertained. The implementation process of the optical cable monitoring system is divided into three parts: information collection, summary and analysis, evaluation and diagnosis of equipment operation. Information is collected so that workers can know the status of monitoring status well. The function of data collection will be lost if the collected data is not summarized and analyzed, the problems reflected by the data will not be found, and the internal rules will not be revealed, making it difficult to implement monitoring. Evaluate and diagnose equipment performance. Since monitoring is the most basic maintenance activity, the ultimate goal of maintenance is to be able to evaluate and diagnose. Structure The optical cable monitoring system is mainly composed of monitoring center, RTU remote testing station and operation terminal. The remote monitoring station mainly includes optical time domain reflectometer OTDR, optical power monitoring OPM unit, optical switch OSW, etc. It is divided into monitoring unit and testing unit. The former mainly monitors the cable information, the latter mainly test the running status of cable. The Monitoring center is located in the control center of optical cable monitoring system, including monitoring network management systems and servers. The main function is to send test and switching commands to the optical time domain reflectometer and optical switch according to the received alarm from the tube power monitoring unit, and to accurately analyze and determine the fault point according to the feedback test results. The operation terminal is the user's operation terminal for the whole system, including the PC terminal and corresponding software, which mainly provides convenient conditions for the user to maintain the line and find the fault point. Monitoring Ways OTDR positioning monitoring, optical power monitoring, and combination of OTDR positioning monitoring and optical power monitoring OTDR positioning monitoring is through online monitoring and backup fiber monitoring. Online monitoring monitors the optical fibers.The WDM is split by the light waves, then the light from the OTDR is transmitted to the service fiber.The wavelength of the test light is transmitted to the unused port of the service fiber. For example, an optical fiber has a 1450nm port to transmit the service optical fiber data. The WDM can be multiplexed by 1300nm OTDR at the transmitter end. In this way, the optical fiber can be loaded with two light waves of different wavelengths at the same time and separated by WDM at the receiver end. The principle of backup fiber monitoring is that the fiber pigtail is drawn from the OSW and connected to the ODF, where it is connected to the backup fiber. This kind of optical cable monitoring system only monitors the standby optical fibers, so the system price is relatively low. Optical power monitoring is carried out using two monitoring stations. Set up an independent light source in the center of these two stations, set the detection mode of optical power in the detection station, and set the alarm threshold. When the optical power consumption exceeds the alarm threshold, an alarm signal will be generated to motivate the startup test and then determine the fault information. The combination of the two refers to OTDR and optical power, so that the complementary advantages of the two can be used to operate the monitoring system and complete the information transmission function. Conclusion The rapid development of optical network makes it hard for the maintenance and labor now, it challenges the traditional maintenance and repair. Therefore, it is necessary to adopt the latest science and technology to manage the information transmission of monitoring system, observe the optical fiber in a dynamic way, find out the failure time and fault location accurately, and ensure the effective transmission of communication information.
