Optical Module Selection and Use Skills

- Jul 25, 2019-

The optical module consists of optoelectronic devices, functional circuits and optical interfaces. The optoelectronic devices include transmitting and receiving parts. The optical module can convert electrical signals into optical signals through photoelectric conversion at the transmitter, and then convert optical signals into electrical signals at the receiver after transmission through optical fibers. Any optical module has the function of sending and receiving, and carries out photoelectric conversion and electro-optical conversion. In this way, the optical module can not be separated from the devices at both ends of the network. At present, there are tens of thousands of devices in a data center. In order to realize the interconnection of these devices, optical modules are indispensable. Nowadays, optical module has become a market segment of data center.

Optical Module Selection

With the extensive use of optical modules, more and more customers begin to pay attention to the stability and reliability of the modules themselves. There are three popular optical modules in the market: original optical module, second-hand optical module and compatible optical module. As we all know, the price of the original optical module is very high, many manufacturers can only stand back. As for the second-hand optical module, although its price is relatively low, but the quality is not guaranteed, often after six months of use, there will be packet loss. As a result, many manufacturers have turned their attention to compatible optical modules. Indeed, in the use of compatible optical modules, their performance is almost the same as that of original optical modules, and the price is several times cheaper than that of original optical modules, which is also the reason why compatible optical modules can be hot. However, the good and bad commodities on the market are uneven, and many merchants use sub-optimal and fish-eye mixed beads to make the selection of optical module difficult. Here we will discuss the selection of optical module in detail.

First of all, how can we distinguish the new optical module from the second-hand optical module? As mentioned above, the second-hand optical module often loses packets after half a year of use, because of the instability of its optical power and the decrease of its optical sensitivity. If we have an optical power meter, we can take it out and measure it to see if its optical power is consistent with the parameters in the data manual. If the access is too large, it is a second-hand optical module.

Then observe the use of optical module after sale. The service life of a normal optical module is five years. It is difficult to see the quality of the optical module in the first year, but it can be seen in the second or third year of its use.

Secondly, it depends on the compatibility between optical modules and devices. Before purchasing, consumers need to communicate with suppliers and inform them which brand of equipment they need to use.

Finally, we also need to see the temperature adaptability of the optical module. The temperature of the optical module itself is not very high, but its general working environment is in the computer room or on the switch, too high or too low temperature will affect its optical power, optical sensitivity and other parameters. Generally, the temperature range of the optical module used is 0-70 degrees C. If it is in extremely cold or hot environment, the optical module of industrial grade - 40-85 degrees C is needed.

Use Skills of Optical Module

If the function of optical module is found to be invalid in the process of use, do not worry about it first, check carefully and analyze the specific reasons. Generally, there are two kinds of functional failure of optical modules, one is the failure of the transmitter and the other is the failure of the receiver. The most common reasons are as follows:

The light module light port is exposed to the environment, and the light port is polluted by dust.

The end face of the optical fiber connector used has been polluted, and the optical module light port has been polluted twice.

The end face of the optical joint with tail fibers is improperly used and scratched.

Use poor quality optical fiber connectors.

Therefore, after choosing and purchasing the optical module correctly, we should pay attention to the cleaning and protection of the optical module in normal use. It is recommended to plug the dust-proof plug when it is not used. Because if the optical contact is not clean, it may affect the signal quality, and may lead to LINK problems and error code problems.

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