Optical adapter

An optical adapter comprising:

• a housing having a plurality of openings on each of opposite end surfaces thereof;
• a plurality of ports formed in parallel with each other inside the housing and each extending to form one of the openings on each of the opposite ends surfaces, an optical connector is capable of being inserted into each of the openings;
• a shutter installed at each of the ports such that when the optical connector is inserted into an opening of one end of the port, the shutter leans back to a retreat position that passes light emitted from the optical connector inserted into an opening of another end of the port, and when the optical connector is pulled out of the opening of the one end of the port, the shutter is raised up from the retreat position to a blocking position that blocks the emitted light;
• and
• a cover that covers surroundings of the housing and having a higher thermal conductivity than the housing,
• wherein the housing includes another opening which is different from the openings, and the shutter raised up to the blocking position is in contact with the cover through the another opening, and
• in the blocking position, the shutter reflects the emitted light onto a surface of the housing which is different from that in an adjacent port.