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N4917B Optical Receiver Stress Test Solution

N4917B Optical Receiver Stress Test Solution
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N4917B Optical Receiver Stress Test Solution - 1

Keysight Technologies Stress Test Solution Unlocking Measurement Insights

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02 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Repeatable Optical Receiver Stress Test for 100GBASE-LR4/ER4 In recent years, transmission speeds in gigabit ethernet have continously increased from 10 Gb/s to 40 Gb/s and are now approaching the 100 Gb/s speed class. 10 Gb/s Ethernet was designed based on a 10.3125 Gb/s line rate on one single-mode fiber per direction. The 40 Gb/s Ethernet speed class changed this to an architecture using the same 10.3125 Gb/s line rate but using 4 optical wavelengths in the O-Band on one single-mode fiber per direction. This...

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03 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Optical Stress Test Typical Setup For 100GBASE-LR4/ER4 The N4917B optical receiver stress test solution consists of a BERT plus a sinewave generator for electrical signal and stress generation; an electro-optical converter that modulates the optical signal from a tunable laser source and a digital sampling oscilloscope which is required for calibration of the stressed eye. A typical setup diagram is shown below. See the configuration guide for a full list of supported instruments. Sinusoidal Interference...

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04 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure 100GBASE-LR4/ER4 Optical Stressed Eye Test Challenges The IEEE 802.3 standard, clause 88.7 describes the optical specifications for 100GBASE-LR4 and 100GBASE-ER4 optical receivers. The following table contains the salient conditions required for stressed receiver sensitivity test. Parameter description Stressed receiver sensitivity (OMA), each lane (max) Extinction ratio (with jitter and interferers off) Vertical eye closure penalty, each lane Stressed eye J2 Jitter, each lane Stressed eye J9 Jitter, each lane...

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05 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure N4917B Detailed Test Setup The core instrument of the optical stressed eye test setup is the J-BERT M8020A HighPerformance BERT system that provides an electrical signal with all the required impairments (random and sinusoidal timing jitter, ISI and sinusoidal amplitude interference) at the data signal output, using a combination of its built-in stress sources plus an external generator. This electrical signal is fed into the 81490A electrical-optical converter to modulate the laser and create the stressed...

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06 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure N4917B Detailed Test Setup After the calibration step, each lane of the DUT should be tested in turn, with valid signals present on the other lanes. Exact connection details and setup depend on the type of device being tested, but a typical example for a transceiver test is shown below. In this example an optical de-multiplexer is used to bring out the 4 lanes on 4 individual fibers. Attenuators in each lane are used to set the relative optical modulation amplitude (OMA) with respect to the lane under test. The...

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07 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure The N4917B optical receiver stress test solution runs on the same computer as the M8070A System Software for J-BERT M8020A. The N4917B controls all of the instruments via USB, The main screen of the N4917B software, the Stressed Eye tab, provides setting of the paramaters required for the calibration of the stressed eye, runs the stressed eye calibration and displays the results for the calibrated stressed eye components. The two remaining tabs - Jitter Conformance and Jitter Performance are used when testing...

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08 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure N4917B Jitter Conformance And Performance Tests The stressed receiver sensitivity test explained in the IEEE 802.3 standard requires a sweep of sinusoidal jitter on top of the previously calibrated jitter and the interference stress and at a specific OMA level. The DUT must meet or exceed a BER of 1E-12 under these conditions. The N4917B software provides two jitter measurements. The Jitter conformance tests per the compliance level in the standard and the optional user selectable margin can be applied to test...

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09 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure N4917B Jitter Conformance And Performance Tests Depending on the test setup and DUT capabilities it is also possible to run fully automated jitter tolerance measurements using built-in JTOL measurement within the M8070A System Software. This test is used when either a. the DUT can be put into loopback mode and a signal from the lane under test is fed back to the BERT, or b. the DUT can be controlled directly from the M8070A software using the DUT Contol Interface (license required) to read the BER directly from...

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10 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure N4917B Features The N4917B software creates a stressed eye optical waveform from the following setting parameters. Setup files contain recommended values for each lane of LR4, ER4. Additionally the user can adjust the parameter values if required prior to a calibration. Settable parameters –– Data Amplitude (mV pp) * –– Sinusoidal Interferer Amplitude (mV pp) * –– Sinusoidal Interferer Frequency (MHz) –– Periodic Jitter 1 Amplitude (UI) –– Periodic Jitter 1 Frequency (MHz) –– Periodic Jitter 2 Amplitude (UI) *...

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11 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure N4917B Requirements N4917B software runs on an external PC PC HW Requirements Operating System: Microsoft Windows 7 (64 bit) Memory: 8 GB RAM minimum Monitor Resolution: WXGA+ (1440 x 900) minimum PC Installed SW Requirements Keysight IO Libraries Suite rev. 17.2.x or later M8070A System Software for M8000 Series version 3.1.52.10 or later Instrument Firmware Requirements M8020A J-BERT : M8070A System Software as above, must run on same PC as N4917B software 81600D DCA-X: FlexDCA version A.05.01.53 or later...

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