An optical connector includes an optical element to be optically connected to an optical fiber; and an optical component. The opposite magnetic coupling fields are obtained by appropriately sizing first and second spacer layers of the sensor and the opposite demagnetizing fields are obtained by appropriately sizing first and second AP pinned layers of a first AP pinned layer structure and appropriately sizing third and fourth AP pinned layers of a second AP pinned layer structure. Accordingly, the developer supplying and exhausting unit of the developing system can be simplified. The third merchandiser module is positioned next and coupled to the first merchandiser module and the second merchandiser module. Therefore, such an approach decreases the time, knowledge, skill and ultimately cost required to persist POJOs to an underlying database.