No products in the cart.
Fiber Optic Connectors: The Heart of High-Speed Networks Leave a comment
Fiber optic connectors are essential components in optical communication systems, as they enable precise alignment, low-loss signal transmission, and flexibility in setting up and maintaining fiber optic networks. With the ongoing increase in bandwidth demand and the adoption of advanced networking solutions, fiber optic connectors have become crucial in industries ranging from telecommunications to data centers and medical technology. This article explores the different types of fiber optic connectors.
What are Fiber Optic Connectors?
Fiber optic connectors are designed to join two fiber optic cables, allowing the transfer of optical signals from one end to another with minimal signal loss. A connector aligns the two fiber cores accurately, so that light can pass from one fiber to the next without deviation or interference. The quality and precision of the connectors impact the efficiency of signal transmission. Making them essential to the performance of fiber optic systems.
Key components of fiber optic connectors
Nearly all types of fiber optic connectors have the following components:
- Connector housing – Sometimes called the connector body or external housing, the housing is the largest portion of the connector and holds the ferrule. Typically, the housing is made of plastic. (Some connector styles are metal.) The housing enables you to mate your fiber optic cable assembly to an adapter or another connector.
- Ferrule – A critical component of the connector, the ferrule holds the optic fiber in place and aids in its alignment. The ferrule can be plastic, ceramic, metal, or glass and is usually cylindrical with a hole through the center.
- Flange – This material holds the ferrule in the housing. Some ferrules require flanges, and some don’t.
- Crimp sleeve – The crimp sleeve is made of soft, lightweight metal such as aluminum or brass. Using a crimping tool, the technician compresses the crimp sleeve to secure the strength members of the cable to the connector. This provides tensile strength, pullout strength, and strain relief. Some connector styles have a built-in crimp sleeve.
- Strain relief boot – Sometimes called the bend relief boot, this component offers side pull bend control to keep the fiber from bending more than 90 degrees and offers twist resistance. Every connector has a strain relief boot attached to the backshell to reduce mechanical stresses.
- Spring – Nearly all connectors are spring loaded. The spring maintains secure pressure against its mated, spring-loaded connector.
- Backshell – The primary job of the backshell is to allow the fiber to feed through the rear (wiring side) of the connector. Its secondary job is to provide a platform for the crimp sleeve. In some cases, the backshell is part of the flange.
Types of Fiber Optic Connectors
Fiber connectors differ based on what types of cables they connect. For example, single-mode fiber connectors and multimode fiber connectors each pair with the cable with the same mode compatibility. Choosing the right types of fiber optic connectors is important. It affects how well your network connects and performs. Here are the most common types of fiber optic cable connectors:
SC Connector
SC fiber connector was the first connector chosen for the TIA-568 standard and is a snap-in connector that latches with a simple push-pull motion. It adopts a 2.5mm ferrule, which is twice the size of the previous LC connector. SC fiber optic connector is ideally suited for datacoms and telecom applications including point to point and passive optical networking. Due to its excellent performance, fiber optic SC connector remains the second most common connector for polarization maintaining applications.
LC Connector
LC connectors have some of the smallest ferrules, measuring 1.25 mm, which is approximately half the size of an ST connector. Their tiny size puts them into the small form factor category of terminations. These connectors work well for multimode transceivers and single-mode cables.
ST Connector
ST (Straight Tip) fiber optic connector was created and licensed by AT&T shortly after the arrival of the FC type. The ST optic connector holds the fiber with a ceramic, spring-loaded 2.5mm ferrule that stays in place with a half-twist bayonet mount. They are usually used in both long and short distance applications such as campuses and building multimode fiber applications, corporate network environments, as well as military applications.
FC Connector
“FC” refers to the Ferrule Connector. This fiber optic connector was the first optical fiber connector to use a ceramic ferrule. Unlike the plastic-bodied SC and LC connector, it utilizes a round screw-type fitment made from nickel-plated or stainless steel. The FC fiber optic connector end face uses an alignment key for correct insertion, and a threaded collet then tightens it into the adaptor/jack.
The FC connectors offer precision for instruments like OTDRs and work well with single-mode fiber, despite added complexity in manufacturing and installation. Initially, designers created them for datacom and telecom applications. However, their use declined with the arrival of SC and LC connectors. The usage of both ST and FC connectors have declined in recent years.
MTP/MPO (Multi-Fiber Push On)
MTP is the commercial brand of MPO connectors. MTP and MPO connectors are the same, except the MTP brand has a specific use for high-performance applications, whereas MPO works on more mechanical situations. These two connectors usually connect ribbon cables with multiple fibers.
These connectors have two to six rows of 12 or 16 fibers. MPO connectors with 12 fibers per row can have two to six rows, with two the most common number. Connectors that have 16 fibers per row do not have more than two rows. Connections between ferrules use pins and holes to mate the ends of the fiber with another cable or an electronic device. Most often, this type of connector has applications in either high-speed links that use multimode or for pre-terminated cable groupings.
MT-RJ Connector
Mechanical Transfer Registered Jack (MT-RJ) connector is a duplex connector that uses pins for alignment and has male and female versions. Constructed with plastic housing and provide for accurate alignment via their metal guide pins and plastic ferrules. The MT-RJ connector is slightly smaller than a standard phone jack, making it easier to connect and disconnect. It also offers lower termination costs and higher density for electronics and cable management hardware compared to other single-fiber terminations.
Conclusion
From SC and LC to MTP/MPO, each type offers distinct benefits for different applications. Making it crucial for network designers and engineers to select the appropriate connector for their needs. As technology evolves, fiber optic connectors will continue to adapt to meet the demands of higher speeds, increased density, and more robust networks, solidifying their importance in the future of communication.
Before you decide on any fiber connector type, it’s crucial to ensure it fits seamlessly with your current network setup. Check factors such as cable type, whether it is single mode or multimode, simplex or duplex, and connector pairs to avoid any compatibility issues down the road.
