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Classification of Optical Fiber Patch Cord

Views: 115     Author: Site Editor     Publish Time: 2020-05-08      Origin: Site

Optical fiber patch cord refers to the connector plug installed on both ends of the optical cable to realize the flexible connection of the optical path. The end with a plug is called pigtail. The center of optical fiber patch cord is the glass core of light propagation. The diameter of the multimode fiber core is about 60μm. The diameter of single-mode fiber core is about 10μm. The outside of the core is surrounded by a glass envelope, which has a lower refractive index than the core to keep the optical fiber in the core. And the thin plastic layer is used on the outside of the optical fiber patch cord to protect the envelope.



Types of Common Optical Fiber Patch Cords

1. LC Optical Fiber Patch Cord

The LC fiber patch cord was developed by BELL Research Institute. The connector is similar to SC, but smaller than SC. The modular jack latch with convenient operation is adopted. And the size of the pin and the sleeve is 1.25mm, which is half of the size used by ordinary SC and FC. It is commonly used in routers, to a certain extent can increase the density of fiber optic connectors in the optical distribution frame.


2. SC Optical Fiber Patch Cord

The SC optical fiber patch cords is developed by Japan NTT Corporation. The structure and size of the pin and coupling sleeve are exactly the same as the FC type. It adopts the standard square joint, which is one of the plug-and-pin latch fastening ways. It is often used as the connector of the GBIC optical module, and is often used on routers. It has the characteristics of low price and small fluctuation of access loss.


3. FC Optical Fiber Patch Cords

The FC optical fiber patch cord is developed by Japan NTT. The outer protective sleeve is a metal sleeve, and the fastening method is a screw buckle. It is generally used on the ODF and the optical distribution frame. It has the advantages of strong fastening and anti-dust.


4. ST Optical Fiber Patch Cord

The ST fiber splice enclosure is round. The fastening method is a screw buckle. It is often used as the 10BASE-F connector, mostly used in optical distribution frames.


5. MPO Optical Fiber Patch Cord

The MPO optical fiber patch cord connector is one of the MT series connectors. The two guide holes with a diameter of 0.7mm on the left and right of the ferrule end face are accurately connected.



The Difference Between Single-mode and Multimode Optical Fiber Patch Cords

The concept of single-mode and multi-mode is to classify optical fibers by propagation mode. In the field of optical fiber data transmission, the term "mode" is used to describe the propagation mode of optical signals in the optical fiber glass core, that is, the mode is the propagation path of light. Therefore, light travels along one path in single-mode fiber, while light travels in multiple paths in the multimode fiber.

1. Appearance

The sheath of single-mode optical fiber patch cord is generally yellow, while that of multimode optical fiber patch cord is generally orange or aqua. In terms of core diameter, the multimode optical fiber patch cords are thicker.


2. Transmission Distance

The transmission distance of single-mode fiber is not less than 5km, which is generally used for long-distance communication. The transmission distance of multimode fiber is only about 2km, which is suitable for short-distance communication in buildings or campuses.


3. Light Source

Because the LED light source is more dispersed and can produce multiple modes of light, it is mostly used for multimode fiber. While the laser light source is close to a single mode, so it is usually used for single mode fiber.


4. Bandwidth

Single-mode fiber has a higher bandwidth than multimode fiber.


5. Cost of Use

Multimode fiber allows multiple light modes to pass, so multimode fiber is more expensive than the single-mode one. However, single-mode optical fibers use solid-state laser diodes as light sources, which are far more expensive than multimode fiber light source equipment, so the cost of using single-mode optical fibers is much higher than the cost of multimode optical fibers.


With the popularity of the network, there are more and more applications of optical fiber patch cords. The selection of optical fiber patch cords directly affects the overall data transmission. Choosing the right optical fiber patch cord can not only reduce the operating cost of the entire fiber network, but also increase the reliability and flexibility of network operation and maintenance.