A Super Detailed Guide Between Old And New Optical Module
1. From the appearance, the appearance of the old module is very old compared to the appearance of the new module after a long time of use, some wear and scratches can be seen on the shell, and there is dust at the interface, which is mostly from different manufacturers.
2. For temperature test, we can identify the temperature of the old module putting it under the condition of 50-60°C to see if it can work normally.
3. For optical port identification, the casing is generally divided into multi-mode plastic casing and single-mode metal casing. The casing of the new module is still different from the second-hand casing. The casing of the new module has a smooth surface and a very bright color. We can set aside the dust jacket to check the casing, if there are scratches on the inner tube wall, and the metal casing is less glossy and rough, then it is a second-hand casing.
4. For performance identification, if a second-hand module is used for more than half a year, various problems will occur. We can identify it from its working current, service life, receiving sensitivity and external cavity. If you want the second-hand fiber optic module to complete the transmission task, it is necessary to adjust the operating current to overload the laser, but as there is dust in the cavity, it will affect the optical path transmission, reducing the transmission quality of the optical signal. Long-term operation will make the optical module hot and shorten its life. Secondly, the sensitivity of second-hand optical modules does not meet international standards, which will lead to packet loss in the communication link under slightly harsh conditions, and seriously affect the network quality. In addition, the material of its outer cavity is mostly plastic or metal material. Repeated plugging and unplugging of the connector will cause a certain degree of wear and tear on the inner wall of the outer cavity, which cannot guarantee the coaxial transmission of the optical device transmission, thus causing certain changes in the optical path of the optical device, resulting in problems such as low optical power, high bit error rate, increased packet loss rate on the device, network timeout, and system instability. Last but not least, you can look at its service life. The service life of a new optical module is generally over three years. If the optical module has been used for two or three years and there is a problem, then it is a second-hand optical module, if you continue to use, the device might completely fail to light.