| CPC G02B 6/4278 (2013.01) | 7 Claims |

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1. An optical transceiver to be inserted into an apparatus along a first direction and be engaged with the apparatus, the optical transceiver comprising:
an outer part provided outside the apparatus upon an engagement of the optical transceiver with the apparatus, the outer part including a first spindle, a rotational member, a sliding member, the rotational member being configured to rotate on the first spindle, the sliding member configured to move along the first direction, the rotational member having a hole, the sliding member having a second spindle, the first spindle and the second spindle being fit with the hole; and
an inner part provided inside the apparatus upon the engagement with the apparatus,
wherein the hole has a first circular area, a second circular area, and a straight area, the first spindle being fit with the first circular area, the second spindle being fit with the second circular area, the straight area being connected between the first circular area and the second circular area.
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