Optical fiber connector capable of switching connection polarity

An optical fiber connector for inserting into an optical fiber adapter with a key recess formed therein, the optical fiber connector comprising:

• a hollow inner housing having a first wall, a second wall, a third wall and a fourth wall, wherein the first wall faces the third wall and connects with the second and fourth walls;
• a first outer housing attached to the inner housing,
• a second outer housing detachably coupled to the first outer housing an detachably attached to the inner housing, the second outer housing comprising a key arm, wherein the second outer housing detachably attached to the inner housing by positioning the key arm selectively on the first wall or the third wall such that the key arm is inserted into the key recess when the inner housing is inserted into the optical fiber adapter;
• wherein the first and second outer housings are hollow and surround the inner housing,
• the first outer housing comprising:
• a fifth wall, a sixth wall, a seventh wall, and an eighth wall, the fifth wall facing the seventh wall and connecting with the sixth and eighth walls, and
• the second outer housing further comprising:
• a ninth wall, a tenth wall, an eleventh wall, and a twelfth wall, the ninth wall facing the eleventh wall and connecting with the tenth and twelfth walls, the key arm extending from the ninth wall, wherein the ninth wall is detachably positioned on the first wall or the third wall.