All-in-One 400GbE PAM4 BER measurements
As 400GbE speeds are being deployed using either the 26.5625Gbaud PAM4 x 8 lanes or 53.125- Gbaud PAM4 x 4 lanes methods, Anritsu has developed the 64-Gbaud PAM4 PPG with ‘best-in-class’ signal level quality and the 32-Gbaud PAM4 ED with excellent Rx sensitivity performance to support evaluation of equipment and devices for high-speed, large-capacity transmissions.
When using the PAM4 method to encode data as four amplitude levels, the gap between signal levels is one-third compared to the NRZ method, which reduces the unit time per symbol at higher baud rates, emphasizing the importance of signal quality in achieving high-speed transmissions.
However, the degraded signal quality caused by crosstalk and noise resulting from use of multiple lanes and high-density circuit design increases the need for evaluation of minimum Rx sensitivity using stress-test signals.
The Signal Quality Analyzer-R MP1900A is a leading bit error rate tester for the over 400G market and supports generation of high-speed signals as well as analysis of signal performance.
The new PPG for PAM4 signals up to 64 Gbaud has the world’s best Tr/Tf (20% to 80%) time of 8.5 ps (typ.) and Intrinsic Jitter of 170 fs (typ.). Moreover, the multichannel function can be expanded up to 4 channels, and the integrated Emphasis function corrects signals degraded by transmission path loss. The 32-Gbaud PAM4 ED module has a high sensitivity performance of 23 mV (typ.) and supports installation of a clock recovery function required for Rx sensitivity evaluation, as well as PAM4 symbol error measurements.
Anritsu – www.anritsu.com