Test & Measurement


Optical probe for real-time scopes

16 May 2018 Test & Measurement

Tektronix has introduced a 56 GBd 400G PAM4 optical probe for use with its DPO70000SX real-time oscilloscopes. Joining the award-winning 33 GHz DPO7OE1 introduced in 2017, the new 59 GHz DPO7OE2 single-mode optical probe delivers the performance and advanced debug capabilities designers need to troubleshoot 400G PAM4 components.

Compared to 100G with NRZ modulation, 400G with PAM4 signalling is far more complex and has substantially increased the time required for design validation, debug and troubleshooting cycles. Although Tektronix also offers 400G equivalent time (sampling) solutions, the migration from NRZ to PAM4 modulation presents a number of validation and debug challenges that only a real-time oscilloscope based solution is equipped to solve.

Delivering ORR (optical reference receiver) performance for 56 GBd PAM4, the DPO7OE2 features a complete set of powerful debug capabilities including software clock recovery for PAM4 and NRZ, triggering, error detection, and the ability to capture time correlated or contiguous records of a signal for offline analysis. It also features elevated optical sensitivity and low noise to accommodate low PAM4 signal-to-noise ratio and channel effects.

The DPO7OE2 can also be used for legacy NRZ applications. Analysis packages support standard optical measurements including ER, AOP, OMA, eye height and eye width, as well as PAM4 IEEE and OIF-CEI standard specific measurements including TDECQ.



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