GBIC stands for gigabit interface converter, which is a fiber optic transceiver module used for optical communication. Also, it is the first standardized optical transceiver which can transmit or receive over 1 gigabit signals in the Gigabit Ethernet. After its appearance in 2000, people could achieve long distance signal transmission regardless the limitation of bandwidth. GBIC is the hot-pluggable transceiver which can be moved in or out without cutting off the electricity. However, with the development of technology, GBIC can no longer meet the demand of people because of its large bulk, people prefer a smaller and more portable transceiver for the convenience of transmission.