What to connect to both sides of the optical module

To connect both ends of an optical module, use compatible optical fibers or MPO patch cords, ensuring correct Tx/Rx alignment and matching connector types.

Fiber and Connector Selection

Each optical module has an optical interface that connects to a fiber optic cable. The type of fiber (single-mode or multi-mode) and connector (LC, SC, FC, or MPO) must match at both ends of the link . For high-speed modules like 40G or 100G, MPO/MTP connectors are commonly used, while lower-speed modules often use LC or SC connectors .

Polarity and Tx/Rx Alignment

Correct polarity is critical: the Tx port of one module must connect to the Rx port of the other module. Misalignment can cause communication failure . For duplex LC or SC connections, this is straightforward, but for MPO/MTP multi-fiber connections, polarity must be managed using Type A (straight-through), Type B (reversed), or Type C (pair-flipped) patch cords .

Using MPO Patch Cords and Adapters

For parallel optical modules (e.g., 40G-SR4, 100G-SR4), MPO patch cords connect the module to backbone cables. MPO adapters may be used to link patch cords, with Type A adapters matching key-up to key-down, and Type B adapters matching key-up to key-up . The fiber arrangement must follow the chosen polarity method to ensure each Tx connects to the correct Rx.

Installation Steps

1. Remove dust caps from the optical module and fiber connectors.
2. Insert the optical transceiver into the module port.
3. Connect the fiber or MPO patch cord, ensuring Tx/Rx alignment.
4. Use temporary labels for identification if needed.
5. Power on the devices and verify the link using the optical port indicators .

Safety and Performance Tips

• Avoid looking directly into the optical interface.
• Do not bend or bundle fibers too tightly, as this can degrade performance.
• Ensure both ends use compatible modules and fiber types to prevent communication errors . By following these guidelines, both ends of the optical module will be properly connected, ensuring reliable high-speed data transmission.