10G/40G/100G fiber link test technology

10G Fiber Link Testing

MPO connectors can support at least 12 fibers, and MPO connectors are mainly used for pre-connected optical cables. Because there are 12-core channels in MPO fiber, for duplex transmission, there are mainly three connection methods of A, B, and C polarities (MPO fiber link polarity. The three methods are for connecting the transmitting end to the receiving end. In order to integrate The compatibility and consistency of the links, in the 10G Fibre Channel, the polarity of the MPO backbone link is mainly B type, the two ends are converted into LC interfaces through the MPO to LC module box, and then the equipment is connected through the LC jumper. , this situation is mainly used in high-density cabling systems in data centers.

Fiber Link Testing

Link under test:

1 MPO-MPO fiber jumper, both ends are the backbone links of the MPO-LC module.

step:

1) Set the benchmark:

Two FC-LC test jumpers connect the light source and the optical power meter.

2) Disconnect jumpers and adapters

3) Connect the fiber under test (the MPO-LC module box at both ends, and the MPO-MPO pre-connected optical cable in the middle), and connect the LC test jumper to port 1 of the module at both ends respectively.

4) Record and save the current loss value of the fiber channel under test, and then replace the LC jumper at the light source end to the 2-12 port of the module to record and save until the loss test of 12 channels is completed.

400G/100G MPO Fiber Link Test

A standard MPO/MTP link consists of two MPO jumpers at both ends, two MPO adapters and MPO pre-connected trunk cables. In TIA-568-C.0-2009B.4, two methods, A and B, are given for parallel multi-channel transmission.

In order to ensure the compatibility and unity of the link, construction and maintenance are more convenient, especially the MPO jumper that is frequently plugged and replaced. In the 40G/100G cabling system, method B is more commonly used. The number of channels of 40G and 100G is different, but the transmission link model is the same, and both use the MPO/MTP interface for end-to-end transmission. Therefore, we take 40G single-channel transmission as an example. When testing, we should pay attention to the port type of the pre-connected optical cable and jumper---with guide pins (male) and without guide pins (female).

The following tests are performed on the most common MPO fiber link model with no guide pins (female) at both ends.

MPO link under test (female-female):

Tools: MPO light source and MPO optical power meter (MPO-specific test light source and optical power meter, the MPO port of the instrument contains 12 light source outlets and optical power meter inlets).

step:

1) Set the benchmark:

Use the MPO-MPO (male-male) jumper to short-circuit the MPO light source and the MPO optical power meter, first select the polarity corresponding to the jumper on the instrument, and then press the reference value (set reference) setting button. At this time, the optical power meter Record the received initial optical power value.

2) Add MPO-MPO (male-male)

Keep the jumper connection at the light source end unchanged, only unplug the jumper plug of the optical power meter, and then add a MPO-MPO (male-male) test jumper of qualified quality and correct polarity to the optical power meter. pass the test).

3) Test

Place the instrument on the main test interface, insert the test jumpers on the light source and the optical power meter into the two ends of the link under test respectively, press the test button, and the instrument will give a pass/fail result (or similar prompts) after a few seconds. icon), press the storage key, name and save the test results. Continue to test the next MPO fiber.

Because optical fiber links have great advantages in meeting people's needs for high bandwidth, the use of optical fibers is becoming more and more extensive. Whether it is cabling construction personnel or network maintenance personnel, it is necessary to master the skills of optical fiber link testing.