Evaluation Engineeering - 15

pattern generation for 400 GbE, inter
symbol interference (ISI) stressed signal
generation to simulate transmission path
losses, and application software for capturing DUT error counts. The new options
allow engineers to more accurately and
efficiently evaluate the bit error rate (BER)
of 400 GbE transceivers and devices, as
well as DSP used by high-speed interfaces
in data centers to reduce development
time and speed time-to-market. With the
options installed, the MP1900A PPG supports required 400 GbE transceiver PHY
layer FEC tests, as well as QSFP-DD, and
OSFP. It can conduct legacy jitter tolerance and input sensitivity measurements,
as well as key tests on the impact of crosstalk due to use of multiple channels and
error correction. To ensure interconnectivity between interfaces defined by the
400 GbE standards, the PAM4 PPG of the
MP1900A has a built-in function for simulating signals after transmission through
a PC board. This capability, which eliminates the need to prototype multiple PC
boards to test transmission path losses,
as well as the ISI function allow for more
efficient testing. A built-in function for
communicating with the DUT IC errorcheck function simplifies jitter tolerance
measurements during early-stage development of high-speed devices."
Tritschler and Zivny, Tektronix: "Our
optical portfolio now extends to realtime oscilloscopes, and we reach all the
way to 59 GHz on our DPO7OE2 optical
probes. With intrinsic jitter of less than
100 femtoseconds for extremely accurate device characterization, Tektronix'

DSA8300 Series of digital serial analyzer
sampling oscilloscopes provides comprehensive support for optical communications standards, time domain reflectometry, and S-parameters. The DSA8300 is
a complete high-speed PHY layer testing
platform for data communications from
155 Mb/sec to 400G PAM4."

OptoTest's OP415 Polarity Analyzer.

Teledyne LeCroy: Our wideband multimode optical-to-electrical converters are
designed for measuring optical communications signals. Their broad wavelength
range and multimode input optics make
these devices ideal for applications including Ethernet, fiber channel, and ITU telecom standards.
They connect to Teledyne LeCroy realtime oscilloscopes and provide capability
for physical layer signal assessment using a variety of oscilloscope tools, such
as SDAIII-CompleteLinQ Serial Data Eye,
jitter, noise and crosstalk analysis, mask
testing, serial triggering and decoding,
and other compliance and debug tools.
They are available to support optical data
rates up to 11.3 Gb/s with reference receivers, or slightly higher without reference
receivers."

OptoTest: "In March of 2018, we announced our latest innovation in polarity testing solutions, the OP415 Polarity
Analyzer. This polarity tester was designed to test 24-fiber MTP/MPO cable
assemblies efficiently, but it can easily be
configured for 8-fiber and 12-fiber testing. It comes preloaded with 12-fiber and
24-fiber polarity types A, B, and C plus the
ability to create and store custom fiber
mappings and channel configurations.
Alternatively, the OP415 can learn polarity
types from existing cables and store those
for future use. Additionally, the OP415
has a manual mode that steps through a
cable, channel-by-channel, which is useful
for troubleshooting or routing fibers during ribbonizing. Bright red lasers on each
channel allow for visual fault detection
on ribbon cables."

Keysight: "Ou r M829 0A O pt ica l
Modulation Analyzer and High-Speed
Digitizer is a flexible solution platform for
400G coherent devices and transmitter
test. It incorporates a 92 GSa/s modular optical modulation analyzer and a
92 GSa/s 4-channel electrical digitizer.
Besides these modules, an additional
arbitrary waveform generator module
up to 92 GSa/s, such as the M8196A, can
be added to the same AXIe
chassis. This setup results
in a compact and flexible
coherent test solution that
can be used together with
additional specialized solution software for Integrated
Coherent Receiver (ICR) and
Coherent Optical Device
module characterization."

Applications

Tektronix' DSA8300 Digital
Serial Analyzer sampling
oscilloscope.

What novel or unique applications have
these vendors' regenerative optical communications test solutions been used for
recently?
Goto, Anritsu: "The MP1900A has been
used to generate a four-channel synchronized 100G PAM4 signal (53 GBd x 4 lanes)
to support next-generation 50+ GBd applications, such as 400 GbE and CEI-112G."
Tritschler and Zivny, Tektronix: "We have
always enjoyed working with researchers on very high-speed testing, and our
80C10C optical module has consistently
been used as a reference for 53 GBd and
faster. We are working on very early experiments in 112 GBd with a selected
partner. We will show more at the ECOC
show (Sept. 23-25 in Dublin, Ireland)."
REFERENCES

1. Keysight Technologies, "Coherent Optical
Communications Test Challenges," August 2017.

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