Fiber Pigtail

The fiber pigtail refers to a connector similar to a half jumper used to connect an optical fiber and an optical fiber coupler. It includes a jumper connector and a section of optical fiber. Or connect transmission equipment and ODF racks, etc.

Only one end of the optical fiber pigtail is a movable connector. The connector type is LC/UPC, SC/UPC, FC/UPC, ST/UPC, LC/APC, SC/APC, FC/APC. Both ends of the jumper are movable connectors. There are many kinds of interfaces, and different interfaces require different couplers. The jumper is divided into two and can also be used as a pigtail. 


The core diameter of the multimode fiber is 50-62.5μm, the outer diameter of the cladding is 125μm, the core diameter of the single-mode fiber is 8.3μm, and the outer diameter of the cladding is 125μm. The working wavelength of the optical fiber has short wavelength 0.85μm, long wavelength 1.31μm and 1.55μm. Fiber loss generally decreases with the lengthening of the wavelength. The loss of 0.85μm is 2.5dB/km, the loss of 1.31μm is 0.35dB/km, and the loss of 1.55μm is 0.20dB/km. This is the lowest loss of the fiber, with a wavelength of 1.65 The loss above μm tends to increase. Due to the absorption of OHˉ, there are loss peaks in the ranges of 0.90~1.30μm and 1.34~1.52μm, and these two ranges are not fully utilized. Since the 1980s, single-mode fibers have tended to be used more often, and the long-wavelength 1.31μm has been used first. 

Multimode fiber

Multi Mode Fiber: The central glass core is thicker (50 or 62.5μm), which can transmit multiple modes of light. However, the inter-mode dispersion is relatively large, which limits the frequency of the transmission of digital signals, and it becomes more serious with the increase of distance. For example: 600MB/KM optical fiber has only 300MB bandwidth at 2KM. Therefore, the transmission distance of multimode fiber is relatively short, generally only a few kilometers.

Single Mode Fiber

Single Mode Fiber: The central glass core is very thin (the core diameter is generally 9 or 10 μm) and can only transmit one mode of light. Therefore, its inter-mode dispersion is very small, which is suitable for long-distance communication, but there are material dispersion and waveguide dispersion. In this way, single-mode fibers have higher requirements for the spectral width and stability of the light source, that is, the spectral width should be narrow and stable. Better. Later, it was discovered that at a wavelength of 1.31μm, the material dispersion and waveguide dispersion of the single-mode fiber are positive and negative, and the magnitudes are exactly the same. This means that at a wavelength of 1.31μm, the total dispersion of a single-mode fiber is zero. From the point of view of the loss characteristics of the optical fiber, 1.31μm is just a low loss window of the optical fiber. In this way, the 1.31μm wavelength region has become a very ideal working window for optical fiber communication, and it is also the main working band of the current practical optical fiber communication system. The main parameters of 1.31μm conventional single-mode fiber are determined by the International Telecommunication Union ITU-T in the G652 recommendation, so this fiber is also called G652 fiber.

Single-mode fiber, the core diameter is very small (8-10μm), the optical signal is only transmitted at a single resolvable angle with the fiber axis, and only transmitted in a single mode, which avoids modal dispersion and makes the transmission room bandwidth wide. The transmission capacity is large, the optical signal loss is small, and the dispersion is small, which is suitable for large-capacity and long-distance communication.

Multi-mode fiber, the optical signal and the fiber axis are transmitted at multiple resolvable angles, and the multi-light transmission is transmitted in multiple modes at the same time. The diameter is 50-200μm, which is inferior to the transmission performance of single-mode fiber. It can be divided into multimode abrupt fiber and multimode graded fiber. The former has a larger core, more transmission modes, narrow bandwidth, and small transmission capacity.

RAISEFIBER specializes in the production of optical patch cords and pigtails, and provides professional fiber optic products for customers with integrated wiring.

Post time: Dec-27-2021