Terminator, terminal, and optical connection structure

A terminator configured to be inserted into a slot of a terminal and optically connected to an optical fiber disposed in the slot, the terminator comprising:

• a filter configured to reflect light in a wavelength range including a specific wavelength and transmit light outside the wavelength range among light from the optical fiber in a state of being inserted into the slot of the terminal;
• a ferrule holding the filter;
• a plug frame enclosing the ferrule;
• and
• a housing coupled to the plug frame,
• wherein the housing has a protruding portion,
• wherein the protruding portion enters the slot when a position of the terminator in a rotation direction with respect to the terminal is an insertable position, and abuts against an inner wall formed inside the slot when the position of the terminator in the rotation direction with respect to the terminal is a position other than the insertable position, and
• wherein the protruding portion rides over a protrusion formed inside the slot when entering the slot.