BER test of PAM4 signalling at up to 32 GBaud
In order to address the need for faster communications speeds between servers and network devices, next-generation 200 GbE/400 GbE Ethernet standards are not only relying on faster symbol rates and multiple lanes, but they are also using PAM (Pulse Amplitude Modulation) as a way to increase the transmission rate. As the next-generation of PAM4 communication standards is developed, a signal integrity test solution with high amplitude 32 Gbaud PAM4 BER generation and high quality and accuracy BER measurement will play a major role.
The Signal Quality Analyzer MP1800A is a plug-in modular Bit Error Rate Tester (BERT) supporting measurement of multi-channel wideband interfaces up to 64 Gbit/sec. The G0375A and G0376A are remote heads for addition to the MP1800A series 32G PPG/ED to extend measurement support for PAM4 measurements using NRZ measuring instruments.
Combining the G0375A with the 28 G/32 Gbit/sec PPG MU183020A converts two 32 Gbit/sec NRZ signals to output a high-amplitude PAM4 signal of 4.4 Vp-p (differential, max.). Additionally, the 3ch PPG synchronization function for independent control of the PAM4 signal 3Eye amplitudes enables high-reproducibility evaluation of optical modulators without using an external driver amplifier.
With built-in PAM4 decode and CTLE functions, the G0376A supports measurement of PAM4 decoded binary signals using the 28 G/32 Gbit/sec High Sensitivity ED MU183040B. In addition, combination with the CTLE function supports high-efficiency, input-sensitivity performance tests.
Anritsu; www.anritsu.com
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