LC = "lucent connector"
ST = straight tooth tip
SC (Square Connector) is a square connector.
2500 *1790mm
Types and application scope of optical fiber jumper interface
The classification and overview of optical fiber jumpers are as follows:
There are also many kinds of optical fiber jumpers (also called optical fiber connectors), that is, optical fiber connectors connected to optical modules cannot be used together. SFP module is connected with LC optical fiber connector, and GBIC is connected with SC optical fiber connector. The following details introduce several common optical fiber connectors in network engineering:
①FC-type optical fiber jumper: the external reinforcement method is metal sleeve, and the fastening method is turnbuckle. Usually used on ODF side (most commonly used in distribution frame)
②SC-type optical fiber jumper: the connector connected with GBIC optical module has a rectangular shell, and the fastening method is plug-in pin type, without rotation. (most commonly used in router switches)
③ST-type optical fiber jumper: it is commonly used for fastening optical fiber distribution frame, round shell and turnbuckle. (For 10Base-F connection, the connector is usually ST type. Usually used in fiber distribution frames)
④LC optical fiber jumper: The connector connected to SFP module adopts modular jack (RJ) locking mechanism, which is convenient to operate. (commonly used by routers)
⑤MT-RJ optical fiber jumper: a square optical fiber connector integrated with transceiver, with two optical fibers integrated at one end.
ST and SC connectors are usually used in general networks. After the ST head is inserted, it is fixed for half a turn with a bayonet, but it is easy to break. SC connector can be plugged and unplugged directly, which is very convenient to use. The disadvantage is that it is easy to fall out. FC connectors are generally used in telecommunication networks. There is a nut screwed on the adapter, which has the advantage of being firm and dustproof, but the disadvantage is that the installation time is slightly longer. The MTRJ optical fiber jumper consists of two high-precision plastic connectors and an optical cable. The exterior of the connector is a precision plastic part, including a push-pull plug-in clamping mechanism. Suitable for indoor applications of telecommunication and data network systems.
Optical fiber module: generally supports hot plug, and the optical fiber interfaces used by GBIC are mostly SC or ST type; SFP, or GBIC in small package, uses LC-type optical fiber.
Optical fiber used:
Single mode: l wavelength 13 10 single mode long-distance LH wavelength 13 10, 1550.
Multi-mode: SM wavelength 850
SX/LH means that single-mode or multimode fiber can be used.
We can often see "FC/PC" and "SC/PC" in the label of pigtail connector, and their meanings are as follows.
The front of 1 "/ "indicates the connector model of the pigtail.
"SC" joint is a standard square joint, which is made of engineering plastics and has the advantages of high temperature resistance and difficult oxidation. SC connectors are usually used for optical interfaces on the transmission equipment side.
The shape of "LC" joint is similar to that of SC joint, but smaller than that of SC joint.
"FC" connector is a metal connector, which is generally used on the ODF side. Metal connectors are plugged and unplugged more often than plastic connectors.
There are many kinds of connectors, besides the three mentioned above, there are, ST, MU and so on.
2./' indicates the cross-sectional technology of optical fiber joint, that is, grinding method.
"PC" is widely used in the equipment of telecom operators, and its connector section is flat.
"UPC" has less attenuation than "PC" and is generally used for equipment with special needs. Some foreign manufacturers use FC/UPC to jump fibers inside ODF racks, mainly to improve the index of ODF equipment itself.
In addition, "APC" model is widely used in broadcast TV and early CATV, and its tail fiber head adopts inclined end face, which can improve TV signal quality. The main reason is that the TV signal is modulated by analog light. When the coupling surface of the connector is vertical, the reflected light returns along the original path.
Because the uneven refractive index distribution of optical fiber will return to the coupling surface again, although the energy is very small at this time, because the analog signal can not completely eliminate the noise, it is equivalent to superimposing a weak signal with time delay on the original clear signal, which is reflected in the picture as a ghost. The tilt angle of pigtail headband can make the reflected light not return along the original path. General digital signals generally do not have this problem.
Scope of use:
Optical fiber communication system
B: optical fiber broadband access network
C: optical fiber cable TV
D: local area network LAN
E: list of optical fiber instruments
optical fibre sensor
Optical fiber teaching data transmission system
H: test equipment
This is the end of the introduction of optical fiber connectors, and more related resources and contents will continue to be arranged and provided by this site.
Optical fiber is a slender and flexible medium used to transmit light beams. Optical cable is composed of a bundle of optical fibers, which is called optical cable for short. Optical cable is the most effective transmission medium for data transmission. The type of optical fiber is determined by the mold material (glass or plastic optical fiber) and the dimensions of core wire and outer layer, and the dimension of core wire determines the transmission quality of light. Commonly used optical cables are: 8.3μ m core, 125μm outer layer, single mode. 62.5μ m fiber core, 125μm outer layer, multimode. 50μ m core, 125μm outer layer, multimode. 100μ m core, 140μm outer layer, multimode. Optical cable types: single-core interconnection optical cable, double-core interconnection optical cable, distributed optical cable, distributed optical cable and outdoor optical cable. There are two kinds of distributed optical cables: multi-unit distributed 12 core optical cable and multi-unit distributed 24 ~ 72 core optical cable. Distributed outdoor optical cables have 4 cores, 6 cores, 8 cores and 12 cores, and armored and fully insulated optical cables have 4 cores, 6 cores, 8 cores and 12 cores. Outdoor optical cables are fully insulated and armored with 24 ~ 144 cores, and there are seven specifications of 24 ~, 36 ~, 48 ~, 60 ~, 72 ~, 96 ~ 144 cores. Indoor/outdoor optical cables have 4 cores, 6 cores, 8 cores, 12 cores, 24 cores and 32 cores.
Characteristic parameters of single-mode fiber
(1) Attenuation coefficient A is exactly the same as multimode fiber in terms of regulation and physical meaning, and will not be described here.
② Dispersion coefficient D(λ) We already know that the dispersion of optical fiber can be divided into three parts, namely mode dispersion, material dispersion and waveguide dispersion. For single-mode fiber, because of the realization of single-mode transmission, there is no mode dispersion problem, so its dispersion is mainly manifested as material dispersion and waveguide dispersion (collectively referred to as intra-mode dispersion). Considering the material dispersion and waveguide dispersion of single-mode fiber comprehensively, it is called dispersion coefficient. Dispersion coefficient can be understood as pulse broadening per kilometer of optical fiber caused by unit spectral width. Therefore, the pulse broadening value caused by dispersion in L-km fiber is σ = δ λ d (λ) L (2. 17), where δ λ is the spectral width of the light source σ is the root mean square broadening value, and the smaller the dispersion coefficient, the better. The smaller the dispersion coefficient, the larger the bandwidth coefficient, that is, the larger the transmission capacity. For example, CCITT suggests that the dispersion coefficient of single-mode fiber should be less than 3.5ps/km.nm at the wavelength of 1.3 1 micron. After calculation, its bandwidth coefficient is above 25000 MHz·km, which is more than 60 times that of multimode fiber (the bandwidth coefficient of multimode fiber is generally below1000 MHz km).
(3) Mode field diameter D Mode field diameter represents the degree of light energy concentration in single-mode fiber. Because only the fundamental mode is transmitting in single-mode fiber, roughly speaking, the mode field diameter is the diameter of the fundamental mode spot on the receiving end face of single-mode fiber (in fact, the fundamental mode spot has no obvious boundary). It can be considered very roughly (very loosely) that the mode field diameter d is similar to the core diameter of single-mode optical fiber.
④ Cut-off wavelength λc We know that single-mode transmission can be realized only when the normalized frequency v of the optical fiber is less than its normalized cut-off frequency Vc, that is, only the fundamental mode is transmitting in the optical fiber, and all other high-order modes are cut off. That is to say, in addition to fiber parameters such as core radius and numerical aperture, the wavelength of light wave must be greater than a certain value, that is, λ≥λc, which is called the cutoff wavelength of single-mode fiber. Therefore, the cutoff wavelength λc refers to the minimum working wavelength that enables optical fiber to realize single-mode transmission. That is to say, although other conditions are met, if the wavelength of light wave is not greater than the cutoff wavelength of single-mode fiber, single-mode transmission cannot be realized.
5. Return loss-Return loss, also known as return loss, refers to the decibel number of the ratio of backward reflected light to input light of the optical terminal. The greater the return loss, the better, so as to reduce the influence of reflected light on the light source and system.
Characteristic parameters of single-mode fiber
① attenuation coefficient a
② dispersion coefficient D(λ)
(3) Mode field diameter D Mode field diameter represents the degree of light energy concentration in single-mode fiber.
④ cutoff wavelength λc
5. Return loss-Return loss Reflection loss is also called return loss.