Tag Archives: fiber splicer

Insert Loss And Return Loss For Fiber Connectors


Optical fiber connector is connected to various devices communication systems are essential components, is currently the largest use of optical devices. Since the local optical fiber communication network gradually, metro and access network users increased demand, global fiber optic connector market in recent years, the total demand continues to expand, the annual growth rate over the next decade is expected to be around 20%.

Although there are more than 70 kinds of Fiber Connectors, and new varieties are still emerging. Typically, the measure of product quality fiber optic connector optical characteristics of the main indicators Insert loss and Return loss. In addition, the impact of product quality and reliability ferrule endface geometry and other physical characteristics of the system indicators are increasingly being valued by manufacturers or end customers. The following from the fiber optic connector works starting on the connector insertion and return loss as a brief introduction:

Fiber optic connectors can not be used, it must be the same with other types of connectors with each other, in order to form a light path connections. Insertion loss is the connector connecting the system with an optical power attenuation (i.e., the output power to the optical connector relative to the input power reduction amount). Insertion loss mainly by optical phase between successive two lateral deviation caused. For example, two optical fibers in alignment, laterally offset is zero, then the result of the minimum insertion loss. However, in the actual docking connector, this is unlikely to be achieved, since the core and the fiber cladding misalignment of the fiber cladding and the pin bore and the pin bore misalignment of the outer diameter of the concentric error, etc., will cause lateral deviation between the fibers.

Meanwhile, the fiber optic connector end face quality vertical clearances and insertion loss is caused by one of the factors commonly used in recent years, UPC plug contact way, you can solve the problem of vertical clearance. In this way, pins and fiber end is spherically polished, so that the two pins relative access under the action of external forces engaged with the engaging morph fiber and flattened, forming an optical fiber butt sufficient to reduce fiber connector vertical clearance.

Return loss is a measure of the back end connector to the size of the parameters of reflected light. The essence of the echo that is reflected light, according to Fresnel reflection principle, the light during the transmission encounter two different refractive index interface Fresnel reflection occurs, causing the optical path of the signal is superimposed or interfere. In high data rate systems of single-mode fiber, in particular cable television system (CATV), reflections of the transmitted signal is generated a time lag, so that the signal time delay to reach the client, cause image ghosting and decreased sharpness.

UPC connector connector contact manner, by reducing the gap between the connection end faces, in addition to reducing the insertion loss, but also reduces the connection end of the reflection and improve the return loss; while for other users of the CATV system, APC type contact method was a better choice: Because APC ceramic ferrule type connector end of its spherical axis normal to the fiber at an angle (usually 8 °), so that the light reflected from the end face escape without returning core, thus greatly improving the return loss of the connector.

Other info: Before installing any fiber optic system, you must first consider the approach to low-loss optical fiber or cable to connect to each other in order to achieve the optical link connection. Fiber link connection, can be divided into permanent and activities of two kinds. Permanent connection, they use a fiber splicing method(related:fiber splicer), bonding method or fixed connector to achieve; activity of continuation, the general activities of the connector to achieve.Want to know more fiber connectors info ,pls continue to focus on my blog.

4 steps in Fiber Optic Fusion splicer

Fiber Optic Fusion splicer may be the act of joining two optical fibers end-to-end using heat. The thing is to fuse both the fibers together in such a way that light passing with the fibers is not scattered or reflected back from the splice, and thus the splice as well as the region surrounding it are almost as strong because virgin fiber itself. The basic fusion splicer apparatus includes two fixtures which the fibers are mounted and two electrodes. Inspection microscope assists in the placement in the prepared fiber ends into a fusion-splicing apparatus. The fibers they fit in to the apparatus, aligned, and then fused together. Initially, fusion splicing used nichrome wire as the heating unit to melt or fuse fibers together. New fusion-splicing techniques have replaced the nichrome wire with fractional co2 (CO2) lasers, electric arcs, or gas flames to heat the fiber ends, causing them to fuse together. The little size of the fusion splice along with the development of automated fusion-splicing machines make electric arc fusion (arc fusion) the most popular splicing approaches to commercial applications.

Splicing fiber optic cable ends together is often a precise process with hardly any room for error. This is because the optical fiber ends must be gathered absolutely perfectly to be able to minimize potential optical loss or light leakage. Properly splicing the cable ends demands the usage of a high-tech tool called a fusion splicer. A fusion splicer perfectly mates the optical fiber ends by melting or fusing them to the other. Splicing fiber cables surpasses using connectors considering that the fusing process results in a superior connection that features a lower level of optical loss. Now,I will introducts 4 steps to fusion splicing.


Know that fusion splicing is essentially several optical fibers being permanently joined together by welding utilizing an an electric arc. The need for an exact cleaver is suggested should you desire less light loss and reflection problems. Understand that an excellent cleaver just for this precise work is nessary. If your poor spice is created, the fiber ends may well not melt together properly and problems can arise.


Prepare the fiber by stripping the coatings, jackets and tubes, ensuring only bare fiber is left showing. You will need to clean all of the fibers associated with a filling gel. A clean environment is imperative for a good connection.


Cutter the fiber. A great wire cutter is suggested to secure a successful splice. When fusing the fibers together, either align the fibers manually or automatic, determined by what type of fusion splicer you’ve got. When you’ve got a new proper alignment, a power arc can be used to melt the fibers together creating a permanent weld of these two fiber ends.


Protect the fiber with heat shrink sleeve, silicone get. This can maintain your optical fiber resistant to any outside elements it may encounter or future breakage.

Alternatives to fusion splicing include using fiber optic connectors or mechanical splices because both versions have higher insertion losses, lower reliability far better return losses than fusion splicing. Want to know more about fiber splicer knowledges, pls visit fs.com to find your answer.