

This connector is highly recommended, especially for test reference cables where one may encounter many different configurations. Karono with the MPO shown above and several other manufacturers have faced this issue and produced a connector that allows changing both pin and key configurations with a simple tool. Multimode MPO has flat ferrule (L) while singlemode ferrule is angled on 2/3 of the end of the ferrule.ĭue to the endface geometry, only about 1/3 of the SM MPO connector ferrules actually mate.Īnyway, these variations create a very difficult situation for users who are forced to specify the exact configuration of each cable and connector. To further complicate the variations on MPO connectors, there appears to be no standard on the orientation of the angled surface – it can be toward the key or away from the key. However the singlemode ferrules do not have an angle across the entire surface, only about 2/3 of the ferrule, so when two ferrules are mated, only the center 1/3 of the ferrule in actually mating. The multimode versions have flat ferrules but the singlemode versions have angled ferrules at the same 8 degree angle used on regular single fiber APC connectors. There are also multimode and singlemode versions of the MPO. These connectors are highly preferred for testing and may be a convenience when building systems where one needs to switch connector types. Note : Several manufacturers offer MPO connectors that are “switchable” allowing them to be changed from pins to no pins or reversing the location of the key. These options for pins/holes and key up/down means that there are 4 types of MPO connectors and a patchcord could have as many as 16 variations (4 on each end), although it’s really half that many if you are looking at the fiber alignment rather than absolute fiber numbering schemes. In use, the MPO connectors form a “plug and jack” style connector, where the plug is a no-pin connector and a jack is a pin connector with mating adapter. The adapter also aligns the MPO connector keys, which may be up or down in relation to the numbering of the fibers. Mating alignment is done by the guide pins and holes but there must be a mating adapter to hold the connector bodies and let them snap into place.

When mating two MPOs, one connector must have pins and another holes, usually referred to as “pins” and “holes” or “no pins.” That nomenclature is more common in the fiber optic industry than describing them as male/female as they are described in the drawing below.

(Note a 16 fiber per row connector is being proposed.) The larger circles represent the alignment pins/holes and the small circles the fibers. As shown in the drawing below, the MPO connector can have 1 to 6 rows of 12 fibers each, although only two versions, 12 or 24 fibers, have gained significant market acceptance. The MPO connector relies on the pins and holes to align the ferrules for the entire row(s) of fibers between the pins. Note the two different connectors, one with pins sticking out from the end of the rectangular plastic ferrule from the connector on the left and the other on the right has holes instead of pins. If field installation is required, splicing on factory made breakout cables (MPO to pigtails) is recommended. Some manufacturers offer prepolished splice versions but they are not widely used. The ferrules should be factory installed and polished on polishing machines to get consistent results.They are usually factory terminated assemblies used for prefab cable systems. Note : These connectors are not generally considered field-installable. The connectors look like these Karono MPO connectors.

These connectors use a large rectangular molded plastic ferrule with one or more rows of 12 fibers or 16 fibers. Prefab cable systems and parallel array transmission systems for 40G/100G on multimode fiber generally use a multifiber array connector called a MPO or sometimes by a trade name MTP. MPO MTP Fiber Optic Connectors and Their Testing Issues - MPO/MTP 16F&32F 400G Fiber Optic Cable.
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