The main test indicators of the optical module include the average transmitted optical power, sensitivity, bit error rate, electrical eye diagram and optical eye
Figure these five technical indicators; the transmitted optical power and optical eye diagram are the important factors to evaluate the quality of the transmitting end of this optical module.
At the same time, sensitivity, bit error rate and electrical eye diagram are important basis for evaluating the quality of the receiving end of the optical module.
Main test methods of optical modules
ive technical indicators; the transmitted optical power and optical eye diagram are the important factors to evaluate the quality of the transmitting end of this optical module.
At the same time, sensitivity, bit error rate and electrical eye diagram are important basis for evaluating the quality of the receiving end of the optical module.
With the rapid development of optical communication technology, the rate of optoelectronic devices is getting higher and higher, which has developed from 2.5Gb/s a few years ago to 10Gb/s SFP+ now, and is advancing to the rate of 40Gb/s. New high-performance optoelectronic and microelectronic devices with integrated functions are also emerging; on the other hand, the industrialization process of research results is accelerating, and the application fields of optoelectronic devices are constantly expanding, and some other performance requirements are also higher. . All of these put forward higher requirements for the development level of optoelectronic devices, but also pose new challenges to their testing and measurement technology. The tests are focused on the research of the high-frequency performance of optical modules. The high-frequency characteristics of optoelectronic devices mainly include two aspects: large-signal dynamic charactency response describes the device at different frequencies. The large-signal dynamic test describes thristic test and small-signal frequency response characteristic test, in which the small-signal frequee transmission characteristics of the device at different rates. For small-signal research, the test results reflect the linear responsivity of the device, while the large-signal test results reflect the device’s nonlinear properties. The main test indicators of the optical module introduced in the previous section include, the average transmitted optical power of the optical signal emitted by the transmitting end, the optical eye diagram, and the receiving end.
The performance test sensitivity, bit error rate, electrical eye diagram, etc. These technical indicators determine the performance of the optical module. In addition, the experiments in this chapter also study the optical module impedance and cut-off frequency, which is more convenient for us to understand the optical module. How it works and features.
Small Signal Frequency Response Characteristics
When an optical module transmits high-frequency signals, its dynamic parameters include phase response, frequency response, reflection, etc. These parameters are also called high-speed characteristics. One of the most important high-speed characteristics of an optical module is the small signal characteristic. The small signal characteristic is a concept relative to its large signal characteristic. It means that the amplitude of the signal received by the optoelectronic device is very small, which does not meet the saturation working condition of the device. As shown in Figure 3.17, for the P-I curve of a semiconductor laser, when the device is working, the static operating point is generally selected in the region with the best curve linearity. When the device works under high-frequency signals, a suitable driving voltage is given to make the optoelectronic device work in its linear range. At this time, the performance of the device is reflected by the amplitude and phase response of the device to small signals of different frequencies.
Conclusion
Today, there are many types of transceiver manufacturers. Only some manufacturers will purchase complete test instruments to conduct comprehensive inspection of optical modules and collect data according to the specifications. QSFPTEK can provide optical module products that have undergone a complete testing process. If you need it, please contact us.
