What Is a Fiber-Optic Patch Cord?
Fiber jumper is used to make the jumper from the equipment to the fiber optic cabling link. It has a thick protective layer and is generally used for the connection between the optical transceiver and the terminal box. It is used in some fields such as optical fiber communication systems, optical fiber access networks, optical fiber data transmission, and local area networks.
An optical fiber jumper (also known as an optical fiber connector) refers to a connector plug at both ends of an optical cable, which is used to realize the active connection of the optical path; a plug with one end is called a pigtail. Optical fiber patch cords (Optical Fiber Patch Cord / Cable) are similar to coaxial cables, but without a mesh shield. At the center is a glass core for light propagation. In a multimode fiber, the diameter of the core is 50 m to 65 m, which is roughly equivalent to the thickness of a human hair. The diameter of a single-mode fiber core is 8 m to 10 m. Outside the core is a layer of glass with a lower refractive index than the core
product type | ST | SC | FC |
| Multimode | Single mode | Multimode | Single mode | Multimode | Single mode |
Insertion loss | 0.2dB | 0.2dB | 0.2dB | 0.2dB | 0.2dB | 0.2dB |
Return Loss | PC45 dB | PC45dB UPC50dB | PC45dB UPC50dB | PC45dB UPC50dB | PC45 dB UPC50dB | PC45 dB UPC50 dB |
Repeatability | 0.2dB | 0.2dB | 0.2dB | 0.2dB | 0.2dB | 0.2dB |
Interchangeability | 0.2dB | 0.2dB | 0.2dB | 0.2dB | 0.2dB | 0.2dB |
temperature range | -40ºC ~ 85 ºC | -40ºC ~ 85 ºC | -40ºC ~ 85 ºC | -40ºC ~ 85 ºC | -40ºC ~ 85 ºC | -40ºC ~ 85 ºC |
product type | MT-RJ | LC |
| Multimode | Single mode | Multimode | Single mode |
Insertion loss | 0.2dB | 0.2dB | 0.2dB | 0.2dB |
Return Loss | PC45 dB UPC50 dB APC65 dB | PC45 dB UPC50 dB APC65 dB | PC45 dB UPC50 dB APC65 dB | PC45 dB UPC50 dB APC65 dB |
Repeatability | 0.2dB | 0.2dB | 0.2dB | 0.2dB |
Interchangeability | 0.2dB | 0.2dB | 0.2dB | 0.2dB |
Ambient temperature | -40ºC ~ 85 ºC | -40ºC ~ 85 ºC | -40ºC ~ 85 ºC | -40ºC ~ 85 ºC |
coding | product name | Description |
NFA1 # * 3 | 3m single-mode fiber optic jumper | 9/125 OS1 fiber |
NFA2 # * 3 | 3 meters multimode fiber optic jumper | 62.5 / 125 OM1 fiber |
NFA3 # * 3 | 3 meters multimode fiber optic jumper | 50/125 OM2 fiber |
NFA4 # * 3 | 3 m 10 Gigabit multimode dual-core fiber optic jumper | 50/125 OM3 fiber |
NFA1 # * 3S | 3m single-mode single-core fiber jumper | 50/125 OM3 fiber |
# *: 1, ST 2, SC 3, FC 4, MT-RJ 5, LC |
a: 1, OS1 2, OM1 3, OM2 4, OM3 |
S: single core; none: dual core |
Optical fiber jumpers can be divided into common silicon-based optical fiber single-mode and multi-mode jumpers according to the different transmission media, as well as other optical fiber jumpers such as plastic, etc .; according to the structure of the connector, they can be divided into: FC Jumper, SC jumper, ST jumper, LC jumper, MTRJ jumper, MPO jumper, MU jumper, SMA jumper, FDDI jumper, E2000 jumper, DIN4 jumper, D4 jumper, etc. form. The more common fiber jumpers can also be divided into FC-FC, FC-SC, FC-LC, FC-ST, SC-SC, SC-ST and so on.
1. Low insertion loss;
2. Good repeatability;
3. Large return loss;
4. Good inter-plug performance;
5. Good temperature stability;
6. Strong tensile performance.
Optical fiber jumper products are widely used in: communication room, fiber-to-the-home, local area network, fiber optic sensors, fiber optic communication systems, fiber optic connection transmission equipment, national defense readiness, etc. Suitable for cable television networks, telecommunications networks, computer fiber networks and optical test equipment. Subdivision is mainly applied in several aspects.
Optical fiber communication system
2. Optical fiber access network
3. Optical fiber data transmission
4. Fiber CATV
5. Local Area Network (LAN)
6. Test equipment
7. Fiber Optic Sensor
Fiber optic jumper
There are three main types of fiber optic jumpers according to termination types: ST-ST, SC-SC, and ST-SC. According to the type of fiber, there are mainly two types of single-mode fiber and multi-mode fiber. Jumper length specifications are 0.5m, 1m, 2m, 3m, 5m, 10m and so on. According to the cable outer sheath material, it can be divided into ordinary type, ordinary flame retardant type, low smoke and halogen-free type (LZSH), low smoke and halogen-free flame retardant type.
According to the fire rating of the building and the fire resistance requirements of the material,
Refer to the requirements in "Acceptance Specifications for Buildings and Building Complexes Integrated Cabling System Engineering" GB / T 50312-2000 and "Construction and Acceptance Specifications for Buildings and Architectural Complex Integrated Cabling Systems Engineering" CECS 89:97.
project | Test Conditions | Single mode | Multimode |
Optical characteristics | Insertion loss | UPC | SM: 1310nm / 1550nm MM: 850nm / 1300nm | 0.2dB | 0.3dB |
APC | 1310nm / 1550nm | 0.3dB | |
Return loss | UPC | SM: 1310nm / 1550nm MM: 850nm / 1300nm | 55 dB | 35 dB |
APC | 1310nm / 1550nm | 65 dB | |
Mechanical characteristics (additional losses) | Impact test | 1.8 height, 8 times | <0.1 dB | <0.1 dB |
Vibration test | 10-60Hz, 1mm full amplitude | <0.1 dB | <0.1 dB |
Mating life | 1000 times or more | <0.1 dB | <0.1 dB |
tensile strength | > 100N | <0.1 dB | <0.1 dB |
Environmental characteristics (additional losses) | High and low temperature cycle test | -25 + 70 , 2 cycles | <0.2 dB | <0.2 dB |
High temperature test | + 80 , 2 hours | <0.2 dB | <0.2 dB |
Low temperature test | -40 , 2 hours | <0.2 dB | <0.2 dB |
Damp heat test | + 40 , 90-95% RH, 2 hours | <0.2 dB | <0.2 dB |
1. According to the connector, it can be divided into: FC, ST, SC, LC, MU, MPO, E2000, MTRJ, SMA, etc. The end contact methods are PC, UPC, APC.
2. Optical fiber outer diameter 0.9mm, 2mm, 3mm, fiber core number: single core, dual core, 4 core, 6 core, 8 core, 12 core or customer specified.
3. Fiber types can be divided into: G652B, G652D, G655, G657A1, G657A2, 50/125, 62.5 / 125,
OM3 (50 / 125-150), OM4 (50 / 125-300), etc.
4.The color of the connector can be divided into: blue (commonly used for single-mode PC, UPC connector), beige, gray (commonly used for multi-mode connector), green (APC connector), water blue (OM3), tail sleeve color Divided into: gray, blue, green, white, red, black, cyan.
5. Length of connecting line: self-defined [1]
"/" Indicates the fiber connector cross-section process, that is, the grinding method.
"PC" is the most widely used in telecommunication operator's equipment, and its cross section is flat.
"SC" indicates that the pigtail connector type is SC connector. Generally, SC connector is used in the optical interface on the transmission equipment side of the industry. SC connector is engineering plastic, which has the advantages of high temperature resistance and not easy to oxidize. It is a metal connector, but ODF does not have high temperature problems. At the same time, the metal connector can be plugged and unplugged more times than plastic, and the maintenance of ODF pigtails is more than that of optical board pigtails. Other common connector types are: ST, DIN, FDDI.
"PC" refers to the fiber connector cross-section process. PC is the most common. APC models are more commonly used in radio and television and early CATV. The pigtail uses an end face with an inclination (8 degrees). The slope is generally invisible, which can improve the quality of the TV signal. The main reason is that the TV signal is analog light modulation. When the connector coupling surface is vertical, the reflected light The original path is returned. Because the uneven distribution of the refractive index of the optical fiber returns to the coupling surface again, although the energy is small, the analog signal cannot completely eliminate the noise, so it is equivalent to superimposing a weak signal with time delay on the original clear signal. Appears on the screen as ghosting. The inclination of the pigtail headband prevents the reflected light from returning along the original path. Generally, this problem does not exist in digital signals.
There is also a "UPC" process. Its attenuation is smaller than that of PC. Generally, flanges for equipment with special requirements are generally FC / UPC. Foreign manufacturers use FC / UPC for internal fiber jumpers in ODF racks to improve the ODF equipment's own indicators.
How to check whether the optical fiber jumper is qualified ?
Use a plug-in return loss meter to first test whether the jumper is clear with a light pen to determine whether the fiber is not broken. General indicators for telecommunications: Insertion loss is less than 0.3dB and return loss is greater than 45dB.
The performance testing of fiber jumpers is divided into:
1. Optical performance testing, including return loss / insertion loss testing. The testing instrument can use FibKey 7602 integrated return loss / insertion loss tester.
2. End face geometry test. The test parameters include curvature radius, vertex offset, fiber height, etc. The testing instrument is an interferometer. Many people use NorlandAC / NC3000 or CC6000 for testing. In particular, CC6000 interferometer is used by more and more factories because of its superior cost performance.
3. Optical fiber end-face scratch detection, use video fiber magnifier to observe, such as many factories use FibView FV-400PA for inspection. The instrument gives the sharpest images and is extremely easy to operate. There are also customers using the FibKey-5600 variable magnification magnifier for testing. The instrument integrates 400x, 200x, and 80x magnifiers in one, which can clearly and conveniently observe the fiber end face and the ferrule end face. Of course, you can also use related software for automatic inspection.
4. Optical fiber tensile test, it is necessary to test the tensile force that the optical fiber connector can withstand.
5. Ambient temperature experiments need to test the performance indicators of fiber optic connectors under different ambient temperature conditions [3] .
