This month, EB-LINK upgraded the quality inspection process of the optical module production line: In addition to the normal temperature test before shipment of each module, it also retested the luminous power, receiving sensitivity and central wavelength under high temperature conditions, and the data was kept in the batch to respond to the recurring problems on the scene.
Why test again at high temperatures?
The semiconductor laser in the optical module is quite sensitive to temperature, the luminous power drops when the die temperature rises, and the center wavelength drifts synchronously, with a typical drift of 0.06 to 0.1 nanometers per degree Celsius.The long-term operating temperature in the machine room cabinet is often between 40° C and 50° C. Only the modules that are qualified are judged according to 25° C, and the power margin may be cut off after the machine is installed. Long-distance links are particularly prone to flickering in this temperature range.
Which metrics are covered by the retest
- Ratio of emitted light power to extinction, confirm that it is not lower than the nominal lower limit
- Receiving sensitivity and overload point, verify receiving window width
- Center wavelength and spectral width, long-distance module additional check temperature drift
- Deviation of the DDM report value from the measured value of the meter to avoid distortion of the monitoring readings
What can batch records save customers?
Shipment after testing only has been implemented for many years, the change is to incorporate high temperature working conditions into the required items and retain the data. Customers can directly compare two readings during acceptance, batch traceability, and cross-brand replacement without leaving the issue for on-site troubleshooting.Supporting services remain unchanged: All optical modules can be customized according to the requirements of Cisco, Huawei, H3C, ZTE, Ruijie and other equipment for free code writing. If they fail the test, they will not be shipped.See for a list of specific modelsSFP 100 Mb Single Mode Dual Fiber 20km Optical Moduleand other product pages.
In the next stage, the high-temperature retest will be extended to the optical transceiver and transceiver production lines, and the factory inspection instructions will be updated simultaneously.If you need to request a batch of test items, you can call 0755-83179002 to communicate with technical support.