Recognize MPO II : MPO fiber optic patch cords

      MPO connectors and fiber optic cables can be processed to produce a variety of forms of MPO patch cords, MPO fiber optic patch cords are widely used in high-density integrated fiber optic line environment, such as 40G, 100G transceiver modules or equipment interconnections within and outside the intercommunication.
      MPO fiber optic patch cords can be divided into adapter and non-adapter types according to the connector type. There are many types of adapter MPO patch cords, ribbon or bundle MPO patch cords through the branch (round or square) fan-out PO patch cords, generally can be adapted out of the 2 ~ 24 core 0.9mm or 2.0mm fiber optic cable branch. Connector type specified by the customer, optional FC, LC, SC and other types, MPO jumper total length specified by the customer, the branch length can be customized for the customer within a certain range, subject to process limitations, the branch is generally not more than 3 meters.

Figure 1 MPO-LC adapter type fiber optic patch cord physical diagram, 2.0mm branch diameter

      Non-transitional MPO fiber optic patch cords have MPO connectors at both ends for interconnection between MPO ports. According to TIA-568 standard, non-transitional MPO fiber optic patch cords have three types of wiring specifications: A, B and C:
      Type A (Key up-Key down) straight-through patch cords: Type A straight-through patch cords use straight-through fiber optic bundles with keyway-up MPO connectors and keyway-down MPO connectors at both ends, and the fiber optic corresponds to the same position at both ends of the patch cord, i.e., the 1st core hole position of the left connector corresponds to the 1st core hole position of the right connector.

Figure 2 Type A straight-through wiring sequence definition

      Type B (Key up-Key up) fully crossed patch cords: Type B fully crossed (Cross) patch cords use reversed fiber bundles, both ends of the keyway up MPO connector, the fiber at both ends of the patch cord corresponds to the opposite position, that is to say, the left connector's 1st core hole position corresponds to the right connector's 12th core hole position. Common module interconnections in optical modules use this type of jumper, such as QSFP-SR4 and QSFP-SR4 module optical port interconnect.
 

Figure 3 Type B Full Crossover Wiring Sequence Definition

      Type C (Key up-Key up) wire to cross the patch cable: Type C wire to cross the patch cable using wire to cross (Cross Pair) of the fiber optic bundle, the two ends are keyway up MPO connector and keyway down MPO connector, the two adjacent optical fibers at one end of the jumper with the other end of the two adjacent optical fibers correspond to the opposite position, that is, the left connector's first core hole position of the left connector corresponds to the 2nd core hole position of the right connector, while the 2nd core hole position of the left connector corresponds to the 1st core hole position of the right connector.

Figure 4 Type C Pair Crossover Sequence Definition

      In practice, we will be based on customer needs and the site application environment to reasonably select the type of MPO patch cords, to ensure the accuracy of the polarity of the fiber optic network.
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