Choosing the right size of Sleeve
It is important to choose the right splice protection sleeve for your application. Variety of diameter and lengths are available to cater to different requirements types of splicing trays. Two key points to remember while choosing the right sleeve for application is, appropriate length and diameter. Inappropriate selection of length can change the bending radius of fiber it may cause sharp bends inside the tray resulting in higher losses. Inappropriate diameter can cause the sleeves to be either too loose or too tight in the organizer, the results of which can be sleeves displaced from their holders or higher pinching force on the protectors. Both these conditions effect long term reliability as well as induce attenuation in installations.
This comment and photograph comes from one of our customer engaged in the field of splicing:
“One of our techs wanted to fwd you this picture from his phone. This is work performed by others that we were called out to repair. The fatal mistake was the sizing of the heatshrinks and chips/holders. Regards, Mark”
As can be seen from the photograph the protection sleeves have come out of the chip holders due to inappropriateness of the diameter. The losses caused in this circuit can be imagined. It is important to correlate the data provided by splice tray manufacturer in relation the available models of sleeves. Few of the models mentioned especially micro sleeve require more careful handling in field installations, some of them 20mm micro for instance are designed for coupler packages and may require special tools or modified cleavers, such sleeves should be chosen for field installations only if alternates are not feasible. Refer to fig. for maximum cleave length permissible for each model. Additional considerations for selection should include type of strength member; dielectric strength member is standard for ribbon sleeve but should be considered in very harsh environments and conditions with high probability of induced EMF.