Reinforcement sleeve

A reinforcement sleeve for reinforcing a fusion splice portion of a plurality of optical fibers for connecting the plurality of optical fibers to each other by fusion splice, the reinforcement sleeve comprising:

• a base member;
• a cover member that sandwiches the fusion splice portion between the cover member and the base member;
• a first adhesive layer disposed between and in direct contact with the base member and the plurality of optical fibers;
• and
• a second adhesive layer disposed between and in direct contact with the cover member and the plurality of optical fibers, wherein
• a width of the reinforcement sleeve is defined by a reinforcement sleeve standard,
• a height of the reinforcement sleeve is 1/n of a height defined by the reinforcement sleeve standard, where n is an integer equal to or larger than 2,
• the base member has sidewalls disposed on opposite ends of the base member in a width direction of the base member so as to extend along a height direction of the base member,
• one of the cover member or the sidewalls comprises a protrusion projecting in the width direction, and
• the other one of the cover member or the sidewalls comprises an engagement hole that engages with the protrusion.