Keysight Technologies N4917B Optical Receiver Stress Test Solution 100GBASE-LR4/ER4/SR4 Solution Brochure 02 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Repeatable Optical Receiver Stress Test for 100GBASE-LR4/ER4/SR4 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 four optical wavelengths in the O-Band on one single-mode fiber per direction. This increased the transmission capacity by a factor of four, without a need to make changes to the speed of the electrical components. In the last few years the 100 Gb/s speed class has been established, increasing the electrical line rate from 10.3125 Gb/s to 25.78125 Gb/s. It also uses both four optical wavelengths on one fiber as well as multiple fibers with one optical wavelength per fiber. The conformance test specification for 100 Gb/s transmission speed class is defined in the IEEE 802.3 standard, clause 88 for 100 Gb/s Ethernet long reach (LR4) and extended reach (ER4) and clause 95 for 100 Gb/s Ethernet short reach (SR4). The N4917B optical receiver stress test solution provides an automated stressed receiver sensitivity test in accordance with the 100GBASE-LR4, ER4 and SR4 test specifications. In order to do this kind of test, several test instruments such as a bit error ratio tester, digital sampling oscilloscope, optical reference transmitter and tunable laser source are required to operate together to achieve a compliant, repeatable optical stressed eye. This stressed eye is then fed to the receiver under test, where bit error ratio is measured under the stress conditions as defined in the standard. The N4917B solution provides: –– Automated calibration of the optical stressed eye according to IEEE 802.3 clause 88 and 95. –– Calibration of ER, VECP/SEC, J2, J4, J9, OMA parameters –– Repeatable results –– Adjustable target values for ER, VECP/SEC, J2, J4, J9, OMA –– Jitter tolerance compliance and margin test –– Electrical loop back or optional DUT control interface for full automated JTOL test –– Remote control of all the test instrumentation –– For this, the N4917B includes the following key equipment: –– a high performance bit-error-rate tester –– an optical reference transmitter for 25.78125 Gb/s –– a tunable laser covering the O-band for LR4/ER4 or a 850nm laser for SR4 03 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Optical Stress Test Typical Setup For 100GBASE-LR4/ER4 and SR4 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 and a digital sampling oscilloscope/CDR which is required for calibration of the stressed eye. Example setups for LR4/ER4 and SR4 are shown in the figures below. See the configuration guide for a full list of supported instruments. Figure 1. Example setup for 100GBASE-LR4/ER4. 04 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Figure 2. Example setup for 100GBASE-SR4. 05 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure 100GBASE-LR4/ER4/SR4 Optical Stressed Eye Test Challenges The IEEE 802.3 standard, clauses 88.7, 95.7 describe the optical specifications for 100GBASE-LR4, -ER4 and -SR4 optical receivers. The following table contains the salient conditions required for stressed receiver sensitivity test. Parameter description Stressed receiver sensitivity (OMA), lane under test (max) Extinction ratio (with jitter and interferers off) 100GBASE-LR4 100GBASE-ER4 100GBASE-SR4 –6.8 dBm –17.9 dBm –5.2 dBm 4 dB 8 dB 2 dB 1.8 dB 3.5 dB - Conditions of stressed receiver sensitivity test Vertical eye closure penalty (VECP), lane under test Stressed eye closure (SEC), lane under test - - 4.3 dB Stressed eye J2 jitter, lane under test 0.3 UI 0.3 UI 0.39 UI Stressed eye J4 jitter, lane under test - - 0.53 UI Stressed eye J9 jitter, lane under test 0.47 UI 0.47 UI - - - {0.28,0.5,0.5,0.33,0.33,0.4} Stressed receiver eye mask definition {X1,X2,X3,Y1,Y2,Y3} Hit ratio 5E-5 hits per sample Setting up a stressed eye according to the standard can be a very time consuming task, even for experienced users it can take a half day. The reason is that the stressed eye parameters are interdependent and therefore several iterations of the optimization cycle are required to converge on the solution. In addition, it is important that the setup is repeatable and remains stable from the time of the stressed eye calibration through to the end of the DUT measurement. Otherwise a drift in the test setup, especially in the electro-optical converter will impair the test results. The N4917B optical receiver stress test solution provides a repeatable and stable measurement in a fraction of time compared to manual setup of the stressed eye. This offers major time saving during daily measurements and speeds up developing a standard compliant test solution when compared to a self made solution. 06 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Ao OMA J2 Jitter J9 Jitter Figure 3. Definition of 100GBASE-LR4/ER4 optical stress parameters. Figure 4. Definition of 100GBASE-SR4 optical stress parameters. VECP = 10 log10 OMA Ao 07 | 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 optical signal. For LR4/ER4, an 8160xA tunable laser is used to set the wavelength for each of the four lanes in turn. For SR4, all lanes operate at a fixed wavelength, using the 81490A internal laser source. The optical output of the 81490A is then attenuated to get to the required optical power level at the input of the receiver under test. Prior to testing the receiver, the optical signal for each wavelength is calibrated using the 86100D Infiniium DCA-X Wide-Bandwidth Oscilloscope with 86105D optical module or using the N1092x DCA-M. All of the equipment is under control of the N4917B software, which takes care of the various equipment settings and performs an iterative adjustment of the BERT stressess until the optical signal measured on the DCA meets the required stressed eye parameters (ER, VECP/SEC, J2, J4/J9, Eye Mask). Figure 5. Example connection diagram for 100GBASE-LR4/ER4 single-mode optical receiver stress test solution. 08 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Figure 6. 100GBASE-SR4 multimode optical receiver stress test solution. 09 | 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. A couple of examples are shown below. LR4 Transceiver Test In this example an optical de-multiplexer is used to bring out the four lanes on four individual fibers. Attenuators in each lane are used to set the relative optical modulation amplitude (OMA) with respect to the lane under test. The calibrated stressed eye signal is connected to the lane under test at the optical mulitplexer which combines all four lanes onto one fiber. 4-lane WDM SMF λ1 λ0 Optical Attenuator Optical Attenuator Optical Attenuator Data Generator 0 TX 2 Data Generator 1 TX 3 Data Generator 2 TX 4 Data Generator 3 RX 1 Error Checker 3 RX 2 Error Checker 2 RX 3 Error Checker 1 RX 4 Error Checker 0 λ3 λ2 λ1 4-lane WDM SMF λ0 Optical DeMux λ2 Optical Attenuator Optical Multiplexer Optical DeMultiplexer λ3 TX 1 DUT 100GBASE-LR4 Transceiver Optional return path to BERT Calibrated Stressed Eye Signal Figure 7. Example 100GBASE-LR4 setup for running a stressed receiver sensitivity test on a device. Electrical loopback Optical Mux BER measurement during the Jitter Tolereance test sweep can either be read from the device under test or optionally looped back to the BERT for fully automated JTOL testing. 10 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure SR4 Transceiver Test In this example, there are four separate fibers, carrying one signal per fiber. Attenuators in each fiber are used to set the relative optical modulation amplitude with respect to the lane under test. The calibrated stressed eye signal is connected to the lane under test. TX 1 Data Generator 0 TX 2 Data Generator 01 TX 3 Data Generator 2 TX 4 Data Generator 3 Optical Attenuator RX 4 Error Checker 3 Optical Attenuator RX 3 Error Checker 2 Optical Attenuator RX 2 Error Checker 1 RX 1 Error Checker 0 Electrical loopback BER measurement during the Jitter Tolereance test sweep can either be read from the device under test or optionally looped back to the BERT for fully automated JTOL testing. 4x MM fiber Optical 4xAttenuator MM fiber DUT 100GBASE-SR4 Transceiver Calibrated Optical Stressed Eye Signal Optional Electrical return path to BERT Example 100GBASE-SR4 setup for running a stressed receiver sensitivity test on a device Figure 8. Example 100GBASE-SR4 setup for running a stressed receiver sensitivity test on a device 11 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure N4917B User Interface The N4917B optical receiver stress test solution controls all of the instruments via USB, LAN or GPIB connections. 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 the device for compliance or margin testing. Figure 9. shows the stressed eye screen for 100GBASE-LR4 to setup the desired calibration parameters: extintion ratio, vertical eye closure penalty, J2 and J9 jitter. In addition, various other parameters can be modified for individual setups. 12 | 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 the target Bit Error Ratio under these conditions (1E-12 for LR4/ER4 and 5E-5 for SR4). 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 at a slightly higher level than the standard requires. The Jitter Performance test allows the user to find the limits of the jitter tolerance test for more detailed margin testing. Results of the jitter measurements are shown numerically and graphically. In example below, the blue line on the plot is the jitter tolerance compliance limit from the IEEE 802.3 standard. The green dots represent actual test data, at the user selectable margin. The yellow line indicates the maximum margin limits of the jitter tolerance test. In these tests the stress level is automatically setup by the N4917B software, using a previously run calibration and the user enters the BER results manually. This test is most approriate when the BER can be visually read from the DUT user interface. Figure 10. Screenshot jitter conformance result 13 | 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 the DUT internal error checker counters. The M8070A JTOL measurement can also be run as a compliance test with/without margin or a tolerance test to find the limits of the DUT. It has several additional features such as a choice of search algorithm, user definable BER depth, etc. Figure 11. Jitter tolerance measurement result screen within M8070A system software. 14 | 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 and SR4. 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) * –– Periodic Jitter 2 Frequency (MHz) –– Random Jitter Amplitude (mUI) * –– Bit Rate (Gb/s) –– Optical Power for calibration (dBm) –– OMA for DUT test (dBm) –– Optical Wavelength (nm) (LR4/SR4 only) –– De-emphasis cursors (dB) –– ISI (dB/GHz) * * These values will be adjusted by the software during the calibration process to meet the calibration parameter targets Calibration & measurement parameters –– Extinction Ratio (dB) –– VECP (dB) or SEC (dB) –– J2 Jitter (UI) –– J9 Jitter (UI) or J4 Jitter (UI) –– OMA for DUT test (dBm) –– Jitter Conformance pass/fail (UI) –– Jitter Performance margin (UI) 15 | 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 3.5.100.2 or later N1010A FlexDCA Remote Access System A.05.51 or later (if using DCA-M) PC Interfaces USB, LAN Instrument Firmware Requirements M8020A J-BERT : M8070A System Software as above 81600D DCA-X: FlexDCA version A.05.51 or later 8164B LMS: version V5.25 or later 81490A Ref Tx: version V5.01 or later 16 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Configuration Guide The N4917B optical stress test solution is built up from a variety of instruments. For some of the instruments, alternative selections are supported by the N4917B software. Each instrument is an individual order and not part of a bundle. This configuration guide is designed to help you determine which instruments you may already have, and which instruments will need to be ordered to make up a complete optical stressed eye test solution. 1) Select the configuration for the J-BERT M8020A and sinusoidal interference generator Step 1. BERT chassis configuration M8020A J-BERT High-performance BERT M8020A-BU2 M9505A 5 Slot AXIe chassis with USB option (requires external PC with USB connection) Step 2. 1st BERT module minimum required configuration M8041A J-BERT High Performance BERT Module M8041A-C16 BERT one channel, 16 Gb/s M8041A-0G2 Second channel for pattern generator M8041A-0A2 Second channel for analyzer M8041A-0G3 Advanced jitter sources Step 3. 2nd BERT module minimum required configuration M8062A High Performance BERT module, 32 Gb/s front end M8062A-C32 32 Gb/s BERT front end M8062A-0G4 Multi-tap de-emphasis M8062A-0G5 Adjustable Intersymbol Interference M8062A-0A4 Clock Recovery (optional). Needed if looping back DUT to BERT for BER measurement Step 4. M8000 System Software configuration M8070A System Software for M8000 Series of BER Test Solutions Select one of the M8000 System Software licence options M8070A-0TP System Software for M8000 Series of BER Test Solutions, Transportable, Perpetual License M8070A-0NP System Software for M8000 Series of BER Test Solutions, Network/Floating, Perpetual License Select one of the M8000 DUT Control Interface licence options (if reading BER from DUT) M8070A-1TP DUT Control Interface, Transportable, Perpetual License (optional) M8070A-1NP DUT Control Interface, Network/Floating, Perpetual License (optional) Step 5. Sinusoidal Interference Source minimum required configuration (select one of the listed signal generators for sinusoidal interference) 81160A 1 or 2 Channel Pulse Function Arbitrary Generator 81160A-001 1 Channel 330 MHz Pulse Function Arbitrary Generator N5171B EXG X-Series RF Analog Signal Generator N5171B-503 Frequency Range, 9 kHz to 3 GHz (Note: can be any other generator from the EXG/MXG/PSG family) 17 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Configuration Guide (continued) 2) Select the configuration for the optical components of the solution Step 6. Lightwave Measurement System mainframe (select on of the Lightwave Measurement System mainframes) 8163B 2-slot Lightwave Measurement System mainframe (recommended for SR4) 8164B 5-slot Lightwave Measurement System mainframe (recommended for LR4/ER4) Step 7. Tunable Laser Source configuration - required for LR4/ER4 only (select one of the tunable lasers) 81602A Extra High Power Tunable Laser 81602A-013 1250 nm to 1370 nm wavelength range, +17 dBm peak 81606A Tunable Laser Family, high Power with low SSE 81606A-113 Tunable laser source 1240 nm to 1380 nm, +13 dBm peak 81608A Tunable Laser Family, Value line, High Power low SSE 81608A-113 Tunable laser source 1240 nm to 1380 nm, +13 dBm peak 81609A Tunable Laser Family, Basic line, High Power low SSE 81609A-113 Tunable laser source 1240 nm to 1380 nm, +13 dBm peak Optical connector interface 81000NI Connector interface, FC - narrow key way (1 required) Step 8. Electrical—Optical Converter configuration 81490A Reference Transmitter Select one of the Single-Mode Fiber Reference Transmitters for LR4/ER4 only 81490A-E09 Ref Tx special with external laser input and internal 1310/1550 nm laser 81490A-E05 Ref Tx special with external laser input and without internal laser Multi-Mode Fiber Reference Transmitter for SR4 only 81490A-E10 Ref Tx special with 850 nm laser and up to 26 GHz electrical bandwidth Optical connector interface 81000FI FC/PC Interface (1 required for -E05, -E09) 81000NI Connector interface, FC - narrow key way (1 required for -E05, -E10, 2 required for -E09) Step 9. Optical Attenuator configuration (select one of the Single-Mode Fiber Attenuators for LR4/ER4 only) 81576A Optical Attenuator high power, power control, straight SMF 81000FI FC/PC Interface 81577A Optical Attenuator high power, power control, angled SMF 81000NI Connector interface, FC - narrow key way N7761A Optical Attenuator (1 channel), SMF N7761A-022 Angled Connectors N7762A Optical Attenuator (2 channels), SMF N7762A-022 Angled Connectors N7764A Optical Attenuator (4 channels), SMF N7764A-022 Angled Connectors Select one of the Multi-Mode Fiber Attenuators for SR4 only N7766A Optical Attenuator (2 channels), MMF N7766A-050 50/125 um multimode fiber interface N77684A Optical Attenuator (4 channels), MMF N7768A-022 50/125 um multimode fiber interface 18 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Configuration Guide (continued) 3) Select the configuration for the DCA and N4917B software components of the solution Step 10. Optical/Electrical Clock Recovery for SR4 only N1077A Optical/Electrical Clock Recovery N1077A-232 Supported input rates: 50 MBd to 32 GBd N1077A-SMS Internal single-mode (9/125 um) and multimode (50/125 um) splitter Step 11. DCA minimum required configuration (select either a DCA-X mainframe/plugin/timebase or a DCA-M model/FlexDCA SW configuration) DCA-X mainframe minimum required configuration 86100D Infiniium DCA-X Oscilloscope mainframe 86100D-ETR Enhanced Trigger, 13 GHz BW, pattern and module trigger 86100D-PTB Internal Precision Timebase 86100D-200 Enhanced Jitter Analysis SW 86100D-300 Advanced Amplitude Analysis/Rin/Q-Factor DCA-X Module. Select one of the DCA-X- Modules, minimum required configuration 86105D Module, 34 GHz optical/50 GHz electrical, 750-1650 nm SMF/MMF 86105D-281 34 GHz optical/50 GHz electrical hardware 86105D-IRC Optical channel impulse response measurement/data 86115D Module, 20/34 GHz optical, 750-1650 nm SMF/MMF 86115D-282 Dual input 28GHz optical sampling module 750-1650nm for SM and MM fiber 86115D-IRC Optical channel impulse response measurement/data DCA-M minimum required configuration (select one DCA-M model) N1092A One optical channel N1092B Two optical channels N1092C One optical, two electrical channels N1092D Four optical channels N1092E Two optical, two electrical channels DCA-M minimum required option configuration Option LOJ Reduce residual jitter from 400 fs to < 200 fs Option PLK Pattern Lock capability Option IRC Extend optical channel bandwidth to 45 GHz and allow creation of reference receiver filters at any data rate from 8 to 42 Gb/s Option 200 Enhanced Jitter Analysis, transportable license (can also be ordered as N1010A-200 FlexDCA license) Option 300 Advanced Amplitude Analysis/Rin/Q-Factor, transportable license (can also be ordered as N1010A-200 FlexDCA license) Option 500 Productivity Package, transportable license (Rapid Eye, TDEC) (can also be ordered as N1010A-200 FlexDCA license) N1010A FlexDCA Remote Access Software Step 12. N4917B Optical Receiver Stress Test Software configuration N4917B Optical Receiver Stress Test Solution Software Select one of the N4917B Single-Mode Fiber licence options for LR4/ER4 only N4917B-0TP Optical Receiver Stress Test Solution for 100GBASE-LR4/ER4, transportable, perpetual License N4917B-0NP Optical Receiver Stress Test Solution for 100GBASE-LR4/ER4, network/floating License Select one of the N4917B Multi-Mode Fiber licence options for SR4 only N4917B-1TP Optical Receiver Stress Test Solution for 100GBASE-SR4, transportable, perpetual License N4917B-1NP Optical Receiver Stress Test Solution for 100GBASE-SR4, network/floating License 19 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Configuration Guide (continued) 4) Select the accessory components of the solution Step 12. Select accessoires as needed N4917B-800 Fiber Optic cable, PMF, protected 37 cm narrow key FC/APC (only required for 81490A-E05) N4917B-801 Cable assembly coaxial Rg/223 50 Ω BNC (male) to BNC (male) N4917B-802 Adapter-coaxial straight (female) BNC (male) SMA N4917B-803 Patchcord FC/PC-FC/PC connector SM fiber 2 m N4917B-804 Patchcord FC/APC narrow key - FC/PC wide key SM fiber 2m (choose -803 or -804 depending on attenuator connectors) N4917B-805 Patchcord FC/PC-FC/PC wide key 50 um MM fiber 2 m N4917B-806 Patchcord FC/APC narrow key -FC/PC wide key 50 um MM fiber 2 m N4917B-807 Cable assembly coaxial 50 Ω SMA (male) SMA (male) (1 required if using DCA-M, 2 required if using DCA-X) N4917B-808 Adapter coaxial N type (male) to BNC (female) adapter (choose only if N5171B SI source) N4910A Matched cable pair, 2.4 mm (male), 0.85 m N9398F DC block 50 kHz - 50 GHz, 2.4 mm (male). (For unused M8061A/2A data output) 85138A Coaxial termination 50 Ω DC - 50 GHz, 2.4 mm (male). (For unused M8062A data output) 11636B Power splitter DC - 26.5 GHz (choose only if using DCA-X) 83059A Coaxial adapter 3.5 mm (male) to 3.5 mm (male) (choose only if using DCA-X) 82357B USB/GPIB interface 10833A GPIB cable, 1 m (choose quantity) 20 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Keysight Related Literature Related Keysight literature Pub. No. Improving the Accuracy of Optical Transceiver Extinction Ratio Measurements 5989-2602EN J-BERT M8020A High-Performance BERT Data Sheet 5991-3647EN Pulse Function Arbitrary Noise Generators Data Sheet 5989-6433EN 8160xx Family of Tunable Laser Sources Data Sheet 5989-7321EN 81490A Reference Transmitter Data Sheet 5989-7326EN 8157xA Optical Attenuators Data Sheet 5988-2696EN N77-Series Attenuators Data Sheet 5990-4394EN Infiniium DCA-X 86100D Wide-Bandwidth Oscilloscope Mainframe and Modules Data Sheet 5990-5824EN N1090A, N1092A/B/C/D/E and N1094A/B DCA-M Optical and Electrical Sampling Oscilloscopes Data Sheet 5992-1454EN N1076A, N1077A Electrical and Optical Clock Data Recovery Solutions Data Sheet 5992-1620EN 21 | Keysight | N4917B Optical Receiver Stress Test Solution - Solution Brochure Evolving Our unique combination of hardware, software, support, and people can help you reach your next breakthrough. We are unlocking the future of technology. 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