A- This is an adapter which will mate to a dissimilar fiber connector. (SC -ST, FC -SC, SC-LC, etc.).
Q- Can you connect different connector types together?
A- Yes, using a hybrid adapter.
Q- When would I use a hybrid fiber adapter?
A- They are very useful in modifying the connector interface to bring legacy connector types up to current connector standards or increasing the density of some connector types within a fiber enclosure.
An example would be an ST-SC duplex, allowing for 12 connector fiber adapter plates rather than 6.
Q - Are there issues with using hybrid fiber adapters?
A - The issue that can be of concern is when a standard 2.5mm ferrule connector such as the SC, ST or FC is trying to be mated with a 1.25mm ferrule Small Form Factor(SFF) connector such as the LC or MU. When this occurs, the differences in ferrule size place very high tolerance requirements on the sleeves within the adapter. Not only must the intermateability for center to center of ferrule be controlled but also the tip to tip mating where dissimilar outside diameters comes together.
Additionally, due to the connector body spacing differences, you will be limited on adapter plate density to the size of the larger connector. Hence you will only be able to achieve a maximum density of 12 connectors per plate. This will also require the separation of the SFF connector pairing at the adapter plate and require a higher degree of attention to polarity requirements.
An alternative solution to solve the tolerance issue when a standard 2.5mm ferrule connector such as the SC, ST or FC trying to be mated with a 1.25mm ferrule Small Form Factor (SFF) connector such as the LC or MU, is to use a same ferrule diameter adapter, with updated connector type, such as ST to SC, and a hybrid fiber optic patch cord, such as SC to LC, which offers polarity control and higher density at one end of the patch cord.