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Agilent 71501D
Eye-Diagram Analysis
User’s Guide
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© Copyright Exclusive Remedies. | The ON symbols are The remedies provided herein Agilent Technologies 2002 used to mark the posi- are buyer's sole and exclusive All Rights Reserved. Repro- tions of the instrument remedies. Agilent Technolo- duction, adaptation, or trans- power line switch. gies shall not be liable for any lation without prior written direct, indirect, special, inci- permission is prohibited, ❍ The OFF symbols dental, or consequential dam- except as allowed under copy
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General Safety Considerations General Safety Considerations This product has been designed and tested in accordance with the standards listed on the Manufacturer’s Declaration of Conformity, and has been supplied in a safe condition. The documentation contains information and warnings that must be followed by the user to ensure safe operation and to maintain the product in a safe condition. Install the instrument according to the enclosure protection provided. This instrument does not prote
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General Safety Considerations CAUTION Fiber-optic connectors are easily damaged when connected to dirty or damaged cables and accessories. The Agilent 71501D’s front-panel input connector is no exception. When you use improper cleaning and handling techniques, you risk expensive instrument repairs, damaged cables, and compromised measurements. Before you connect any fiber-optic cable to the Agilent 71501D clean it thoroughly. CAUTION This product is designed for use in Installation Category
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Contents 1 Getting Started Steps for Setting Up Eye-Diagram Analysis 1-4 2 Application Tutorials Tutorial 1: Measure Eye-Parameters 2-4 Tutorial 2: Measure in Optical Power Units 2-8 Tutorial 3: Measure Extinction Ratios on Low-Level Signals 2-10 Tutorial 4: Measure Laser Turn-on Delay 2-13 Tutorial 5: Use Software Filters 2-15 Tutorial 6: Test to Industry Standards 2-19 Tutorial 7: Default and Custom Mask or Limit Line Testing 2-23 Tutorial 8: Display the Data Pattern 2-27 Tutorial 9: Construc
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Contents 5 Specifications and Characteristics Vertical Specifications 5-3 Input Channel Specifications 5-4 Trigger Specifications 5-5 Trigger Specifications 5-6 Horizontal Specifications 5-7 Declaration of Conformity 5-8 Contents-2
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1 Getting Started
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Getting Started Getting Started with the Eye-Diagram Analyzer Getting Started with the Eye-Diagram Analyzer In this chapter, you will find information on the following topics: Steps for Setting Up Eye-Diagram Analysis 1-4 Step 1. Connect the Equipment 1-12 Step 2. Load the Personality 1-16 Step 3. Complete the Installation Using the Screen Instructions 1-19 Step 4. Set Up the Measurement Conditions 1-22 Optional Step. Save Instrument State as Preset State 1-26 The Agilent 71501D Eye
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Getting Started Getting Started with the Eye-Diagram Analyzer The custom keypad The eye-diagram analyzer comes with a custom keypad that snaps into the front panel of 70004A displays. The keypad gives you quick access to common instrument functions. (Each of these functions can also be accessed using the normal softkey menus.) If you have the custom keypad, practice using it. You will find that the time required, for many of the procedures in this book, will
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Getting Started Steps for Setting Up Eye-Diagram Analysis Steps for Setting Up Eye-Diagram Analysis 1 Connect the equipment. 2 Load the eye-diagram personality. 3 Complete the installation using the self-guided screens. 4 Set up the measurement conditions. Connect the You can connect the equipment in three possible configurations: Equipment With 70841A/B pattern generator and 70311 clock source modules. This is the preferred configuration. With an 70841 pattern generator module with a
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Getting Started Steps for Setting Up Eye-Diagram Analysis Note When used with an 71612A/70843, the system requires a manual configuration. Set Up the Select from eye, eyeline, and pattern modes Measurement Use the Setup menu’s diagram softkey to select from one of three measure- Conditions ment modes: eye, eyeline, and pattern. Features Available in Each Mode Eye Mode Eyeline Mode Pattern Mode Eye Measurements X Extinction Ratio Measurements X X Mask Testing X X X Display the Mask E
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Getting Started Steps for Setting Up Eye-Diagram Analysis Eye Mode The eye mode displays traces using individual dots in a manner that is similar to conventional sampling oscilloscopes. Use this mode for the following: Typical eye-diagram measurements Extinction ratio measurements
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Getting Started Steps for Setting Up Eye-Diagram Analysis Eyeline Mode : Eyeline mode displays continuous traces. Use this mode for the following: Measure extinction ratio Measure laser turn-on transition delay Examine laser overshoot Observe laser ringing Apply eye-filter Apply user-corrections 1-7
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Getting Started Steps for Setting Up Eye-Diagram Analysis Pattern Mode Pattern mode displays the actual PRBS data stream bits. This mode uses the pattern trigger which allows the display to show the same portion of the data stream from sweep to sweep. Mask/limit lines provide pass/fail testing Mask/limit lines are displayed geometric shapes that define the acceptable limits and shape of an eye-diagram. The following figure shows a mask. Use masks for pass/fail testing and as an aid to erro
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Getting Started Steps for Setting Up Eye-Diagram Analysis Apply software filters in eyeline mode In eyeline mode, user frequency corrections can be applied to the data to sim- ulate a hardware transmission filter. The eye-diagram analyzer comes with several Bessel-Thomson filters. These files are on the 71501D memory card. Refer toChapter 9, “Agilent 70820A: User Corrections” and Chapter 11, “Agi- lent 70820A: Memory Cards, Disks, and RAM”for information on user-correc- tions. User Correctio
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Getting Started Steps for Setting Up Eye-Diagram Analysis Three sweep selections are available single continuous stopped With the continuous selection, sweeps occur as soon as the selected triggering conditions are met and repeat continuously as long as the trigger conditions are met. The source of the trigger reference is selected using the Setup menu’s CH2 softkey. The following table shows the reference used when using an Agilent 7084X pattern generator. Table 1-1. Trigger Refere
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Getting Started Steps for Setting Up Eye-Diagram Analysis These softkeys can also be used to specify an optical-to-electrical responsivity conversion between the source and input channels. As a result, the display shows optical units referenced to the input of the optical-to-electrical con- verter. Channel and marker readouts change to watts/div. Also, the CH1 EXT ATTEN softkey changes to read CH1 RSPVTY (responsivity). Autoranging The Trg,Cal menu’s autorng ON OFF softkey turns on or off au
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Getting Started Steps for Setting Up Eye-Diagram Analysis Step 1. Connect the Equipment 70841A/B Pattern Generator and 70311A Signal Generator Modules 1 If you are using 70841A/B pattern generator and 70311A signal generator modules with your eye-diagram analyzer, install them into an MMS mainframe as shown in the following figure.
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Getting Started Steps for Setting Up Eye-Diagram Analysis 2 If you are using 70841A/B pattern generator and 70311A signal generator modules with your eye-diagram analyzer, connect cables to the instruments as shown in the following graphic. If you are using a clock source other than an 70311A, make sure that the signal generator and 70820A microwave transition analyzer module share the same frequency reference. Use the 10 MHz REF connectors on the rear panel of the 70820A. Rear-Pane
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Getting Started Steps for Setting Up Eye-Diagram Analysis Front-Panel Cable Connections Cables: SMA to SMA (Channel 1) p/n 8120-4948 SMA to SMA (Channel 2) p/n 8120-4948 SMB to SMB (10 MHz Reference) p/n 8120-5025 Miscellaneous: 3.5 mm (f) to 2.4 mm (f) (two) p/n 1250-2277 6 dB attenuator 8493C 4 If the attenuator connected to the 70820A’s RF INPUT 2 connector is not 6 dB, press: Trg,Cal, CH2 EXT ATTEN, then enter the value of the attenuator
