In recent years, as people’s requirements for broadband speed are getting higher and higher because the performance of optical fiber is superior to that of copper cable, it is widely used in the backbone construction of broadband projects. At the same time, due to the increasing coverage of optical fibers, the detection of optical fiber faults is becoming more and more important. What methods can be used to eliminate the failure of optical components?
First of all, to eliminate the failure of optical components, it is necessary to pass the test, then what are the test and measurement equipment of the optical network? At present, the super six network cable manufacturers Weikang understand that there are mainly three kinds of instruments. They are optical loss test equipment (also known as an optical multimeter or optical power meter), fault locator (fault tracker), and fiber identifier.
Optical power meter: Used to measure absolute optical power or relative loss of optical power through a length of the fiber. Optical Multimeter: Used to measure the optical power loss of a fiber link.
In order to measure the loss of a cable link, it is necessary to transmit calibrated steady light at one end and read the output power at the receiving end. These two devices constitute an optical loss tester. When combining a light source and a power meter into a set of instruments, it is often referred to as an optical loss tester (also known as an optical multimeter). When we measure the loss of a link, one person needs to operate the test light source at the transmitting end and the other person uses the optical power meter to measure at the receiving end so that only the loss value in one direction can be obtained.
Usually, we need to measure the loss in both directions (because there is a loss of the connection or it is due to the asymmetry of the transmission loss of the cable). At this point, the technicians must exchange equipment and conduct measurements in the other direction. However, what should they do when they are separated by more than a dozen floors or tens of kilometers? Obviously, if each of these two people has a light source and an optical power meter, then they can measure simultaneously on both sides. Today’s advanced cable test kits for certification testing are capable of two-way dual-wavelength testing, such as Fluke’s CertiFiber and DSP cable test series FTA cable test kits.
2, fiber fault locator (fault tracker)
Fault locators are mostly hand-held instruments for multimode and single-mode fiber systems. The OTDR (Optical Time Domain Reflectometry) technology is used to locate the fault of the fiber, and the test distance is mostly within 20 km. The instrument directly displays the distance to the point of failure by number. Suitable for: Wide Area Network (WAN), 20 km range communication systems, fiber to the roadside (FTTC), single mode and multimode fiber optic cable installation and maintenance, and military systems. In single-mode and multi-mode cable systems, fault locators are an excellent tool for locating faulty connectors and bad splices. The fault locator is easy to operate and can detect up to 7 multiple events with single button operation.
This device is based on the laser diode visible light (red light) source. When light is injected into the fiber, if there is a fiber failure, connector failure, excessive bending, poor welding quality, etc., the light emitted through the fiber can be on the fiber. The fault is visually located. The visual fault locator is transmitted in continuous wave (CW) or pulsed mode. Typical frequencies are 1 Hz or 2 Hz, but can also operate in the kHz range. Typical output power is 0dBm (1Mw) or less, the working distance is 2 to 5km, and supports all common connectors.
3, fiber recognizer
It is a very sensitive photodetector. When you bend a fiber, some of the light is radiated from the core. The light is detected by the fiber identifier, and the technician can identify the single fiber in the multi-core cable or the patch panel from other fibers based on the light. The fiber identifier can detect the state and direction of light without affecting transmission. In order to make this work easier, the test signal is usually modulated at the transmitting end to 270 Hz, 1000 Hz or 2000 Hz and injected into a specific fiber. Most fiber identifiers are used for single mode fiber optic cables operating at 1310 nm or 1550 nm. The best fiber identifiers are available to identify the direction and power of transmission in fiber optic cables and test cables online using technology.
In summary, the project that generally uses a large number of large-scale project equipment fiber optic is. To complete an optical loss measurement or to eliminate the failure of a fiber optic equipment, a calibrated light source, and a standard optical power meter are not available. Lack of.
Responsible Editor: DJ Editor
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