Receptacle module

An optical fiber connection assembly comprising:

• a receptacle having first and second sleeves formed at positions facing each other in an axial direction by way of a window;
• an optical module provided with at least one of a light receiving element and/or a light emitting element and a first optical fiber and having a projection for insertion through said window and a body for insertion into said second sleeve, the first optical fiber being exposed at an end face of said projection;
• and
• an optical fiber connector having a ferrule through which a second optical fiber cable passes and is exposed at its end face, a housing holding said ferrule to be able to move in the axial direction, and a spring for pushing said ferrule in said housing toward the inside of the first sleeve;
• wherein
• a length of said projection is formed to be substantially at least a length of said window in the axial direction;
• the end face of the projection positioned at an end face of said window at said first sleeve side or is positioned inside said first sleeve when the body of said optical module is fully inserted into said second sleeve;
• and
• the end faces of said first optical fiber and said second optical fiber are optically connected by a connection load of at least 1.09 times the standard value of the connection load when optically connect two optical fiber connectors when the optical fiber connector is inserted in said first sleeve.