In order to meet the needs of high-speed network, a large number of optical fiber cables are laid in today's data center and access network, followed by a variety of optical fiber failures. After the failure of optical fiber, there will be stuck, packet loss and other situations, and even network disconnection, and the daily detection and maintenance of optical fiber as a consumable is also essential. Do you know the standard of optical fiber detection? How to use optical fiber detection tools for optical fiber detection? This paper will introduce these optical fiber detection problems one by one to help users better manage and maintain the optical fiber.
What is the standard of optical fiber detection?
The basic contents of optical fiber detection include optical fiber connectivity detection, optical fiber attenuation detection, optical fiber pollution detection and optical fiber fault location detection. Optical fiber attenuation detection, namely optical power loss detection, is an important index in optical fiber detection, which is related to the length of optical fiber link, conduction characteristics, the number of connectors and the number of connectors.
Attenuation standard for fiber link wiring
Wavelength / category
| Maximum attenuation
| |
Optical fiber
| 850nm | 3.75dB |
1300nm | 1. 5dB | |
1310nm | 1.0dB | |
1550nm | 1.0dB | |
Optical fiber connection point
| Adapter（Duplex ST or SC） | 0.75dB |
Fusion welding | 0.3dB |
Attenuation standard for optical network applications
Fiber type | Attenuation | Length | |
1000Base-SX（850nm laser）
| 62.5 μm multimode fiber | 3.2dB | 220m |
50 μm multimode fiber | 3. 9dB | 550m | |
1000Base-LX（1300nm laser）
| 62.5 μm multimode fiber | 4.0dB | 550m |
50 μm multimode fiber | 3.5dB | 550m | |
8/125 single mode fiber | 4.7dB | 5000m |
How to use optical fiber detection tools for optical fiber detection?
In the detection of optical fiber, the commonly used detection tools are: red light pen, optical power meter, optical fiber detection microscope and OTDR optical time domain reflectometer.
1. Red light pen is also called optical fiber fault test pen, which is mainly used to detect the connectivity of optical fiber. It can detect the break or bend of optical fiber within 10km, and also calibrate the optical attenuator and light source. There are two modes: constant brightness mode and flicker mode. Constant brightness mode can stably present the fiber connectivity, and flicker mode can quickly detect the fiber breakpoint position.
2. Optical power meter is mostly used for absolute optical power detection or optical power loss detection in a certain link. With large area detector, its stability and reliability are greatly improved. It has ultra wide optical power test range, accurate test accuracy, and new ref definition and connection interface design.
3. The optical fiber detection microscope is mainly used to check the dirt on the end face of the optical fiber. If the end face of the optical fiber is polluted, it will increase the attenuation of the optical signal or cause a certain degree of network failure. It can quickly detect the dent, scratch, pollution and other conditions on the optical fiber jumper.
4. OTDR optical time domain reflectometer is an advanced optical fiber detection equipment in optical fiber detection. Through the analysis of measurement curve by OTDR optical time domain reflectometer, users can understand the uniformity, defects, fracture, joint coupling and other properties of optical fiber in detail.
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