Mode conditioning patch cords are designed for longwave(1310nm) Gigabit Ethernet applications over multimode fiber. They consist an offset connection of a SM fiber to a MM fiber. There are two MM fibers on one end and one MM and one SM fiber on the other. This patch cords is required with -LX or longwave Gigabit Ethernet transceivers that use both SM and MM fibers. When launching into a MM fiber, the transceivers can generate multiple signals that cause Differential Mode Delay (DMD) which can severely limit transmission distances. A mode conditioning patch cord removes these multiple signals, eliminating problems at the receiver end.

What is mode conditioning patch cords/cables?

Definition of Mode Conditioning Patch Cables
Mode Conditioning Patch Cables (MCP) is a duplex multimode patch cord that has a small length of single-mode fiber cable at the start of the transmission leg including a single mode to multi-mode offset fiber connection part. Mode Conditioning Patch Cables are assembled with connectors using 62.5/125um or 50/125um fiber. The calibrated offset reduces phenomena called differential mode dispersion, or DMD, which can cause the transmitting laser pulse to spread out and merge into neighboring pulses creating bit errors in the transmission signal.

Technical speicifications

Appearance

光有源设备中光链路互连

光纤数据传送、需模式转换的场所

骨干收发网、局域网（LAN）、城域网（MAN）

How the Mode Conditioning Cable Works:
The need for this conditioning fiber optic patch cord is due to the single-mode launch nature of the-LX or long-wave(1300nm) transceiver modules used for Gigabit Ethernet.

Launching a single-mode laser into the center of a multimode fiber can cause multiple signals to be generated that confuse the receiver at the other end of the fiber.

In that case, a mode conditioning patch cord eliminates these multiple signals by allowing the single-mode launch to be offset away from the center of a multimode fiber.

This offset point creates a launch that is similar to typical multimode LED launches. (see diagram below)

How to Install the Mode Conditioning Cable:
If your gigabit LX switch is equipped with SC or LC connectors,please be sure to connect the yellow leg(Singlemode)of the cable to the transmit side,and the orange leg(multimode)to the receive side of the equipment.

It is imperative that this configuration be maintained on both ends.The swap of transmit and receive can only be done at the cable plant side.(see diagram below)

Single mode to Multimode Converter