400G PAM4 Testing

400G PAM4 Testing


Overcoming 400G measurement challenges

The rapid worldwide growth in cloud computing is driving massive demand for high-performance datacenter infrastructure. To keep pace with this relentless demand, developers are transitioning to 400G technologies enabling smaller, faster, lower cost-per-bit solutions.

There are several core technologies that are enabling 400G, including the use of higher order modulation and higher data rates. This new modulation scheme provides four-level pulse amplitude modulation (PAM4), which transmits two bits per symbol, doubling the data rate compared to conventional NRZ.

PAM4 signals, having a lower signal-to-noise ratio and 1/3 of the amplitude of equivalent NRZ, require more advanced tools and features for successful validation.

Accelerate 400G product development

Developing 400G products is challenging. PAM4 signals require more sophisticated tools and features in order to evaluate them successfully. Superior features, trigger and debug capabilities are required to troubleshoot and measure PAM4 signals.

Tektronix Real-time solutions give you the ability to efficiently validate your technology advances and rapidly debug and validate 400G technology complementing the low-noise of a sampling oscilloscope.

The transition from NRZ to PAM4 has increased the complexity of testing optical signals.

Validate faster and increase yield

One of the greatest challenges is keeping test cost per device as low as possible while meeting required specifications. With PAM4 signals increasing the number of tests needed to conduct versus NRZ signals by a factor greater than 10, solutions providing measurements quickly for optimized tuning, with the lowest noise to maximize production yields are required.

Tektronix Sampling solutions provide you with the highest bandwidth, highest sensitivity, and shortest test time enabling you to effectively balance performance and testing costs keeping a low cost per test.

The TDECQ measurement shows the testing complexity of a PAM4 signal.

Facing challenges in other wired communication applications?


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