What is Splice Joint Closure?

What is Splice Joint Closure?

Splice joint closure is a process where two fiber cables are joined. In a central tube type of splice closure, the fibers are located inside the central core tube, which is supported by a central strength member. The other type of splice joint closure is characterized by multiple tubes that are helically wound around the central strength member and contain fibers.

Fiber optic splice joint closure

Fiber optic splice joint closures are used to permanently connect two optical cables. They protect the cable from moisture, heat, and cold. They are widely used in cable duct and direct buried applications. These devices have a good sealing performance and a wide range of application.

Fiber optic splice joint closures are made in different shapes. Some are cylindrical, while others are flat. The main purpose of these devices is to join optical cables in a network. Depending on the design, they can protect several hundred fibers.

They can withstand pressures of 106 kPa.

Before performing splicing, fiber optic cables should be cleaned and free of damage. They should be positioned correctly inside the splice unit. Mechanical splices are usually covered with a matching gel that helps in coupling light. They also protect themselves by forming a mirror-smooth end.


There are various types of splice joint closures. They are commonly used in fiber optic cables. These splicing closures are usually used in aerial FTTH “tap” locations. These enclosures help to protect the spliced fiber and provide a splice joint with enough space. They also act as a protective cover for the joints of outdoor fiber cables.

One of the most important things to consider in fiber optic installations is the type of splice joint closure that will be used. This closure should be able to accommodate fiber optic connectors as well as fusion or mechanical jointing. It may also need to contain Bragg gratings or removable wavelength filters. With the rise of WDM-PONs, this will become even more important.

When choosing a cable splice joint closure, the material must be durable enough to withstand the motion of the cable. It should also be able to resist temperature changes. Some closures are built with UV-resistant resins and can withstand thermal expansion and contraction.


The present invention provides a method for splicing fiber optic cables using a splice joint closure. The splice joint closure includes a base and an anchor means, which is generally centrally positioned. The base also includes a support means for a splice tray.

The base 16 has a cover 17 that extends from the base. The base and cover are sealed together with fastening bolts. The splice joint closure has sealing washers 121 that are slit rings that engage the corrugations of the arcuate wall 25. The sealing washers prevent the mastic sealant from escaping the ends of the ports. The splice joint closure further includes plugs 110 that plug the unused ports. The base and cover are also secured by anchor members.

The splice joint closure can also have an adapter plate, which allows it to be expanded for greater capacity. In addition, it features a splice holder and a buffer tube retainer. These components protect the cable connection and allow for a more secure and reliable splice joint closure.


The splice joint closure is a fiber optic connector that accepts multiple types of cables. These include loose-tube and central-tube cables. The former type has one central core tube with strength members arranged around it. The latter type contains multiple tubes helically wound around the central strength member. The fibers are located inside the tubes.

The fiber optic splice closure is mainly used in direct buried and aerial cables. It protects the joints in the cables and ensures safety. It features an excellent mechanical strength and an out-shell that can withstand pressures up to 70 kPa. These closures are made of high-quality engineering plastics.

Before using a closure, make sure to clean the surface thoroughly. It is important to orient the closure so that any debris that falls out does not get caught. Remove the cover carefully, ensuring that the O-ring is set aside for cleaning. Next, clean the grooves on the cover and end plate with B-Sealant.