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  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 DPO7OE1 33 GHz Optical Probe User Manual *P071355800* 071-3558-00...
  • Page 4 The servicing instructions are for use by qualified personnel only. To avoid personal injury, do not perform any servicing unless you are qualified to do so. Refer to all safety summaries prior to performing service. This document supports DPO7OE1 software version 1.0 and above. www.tek.com 071-3558-00...
  • Page 5 Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries or suppliers, and are protected by national copyright laws and international treaty provisions. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all previously published material.
  • Page 6 Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.
  • Page 8: Table Of Contents

    ......................Cleaning the exterior of the probe ....................Probe setup ........................... Vertical Setup settings ......................Probe Setup settings ........................ Calibration ............................ Dark level compensation ......................Signal path compensation ......................Optical filter and bandwidth settings .................... DPO7OE1 Optical Probe User Manual...
  • Page 9 .................... Bandwidth for the ORR filter settings ..................Optical reference receiver performance ..................Appendix A: Programming Interface (PI) commands CH<x>:OPTIcal:RCVR ........................ CH<x>:OPTIcal:RCVR:USERVALue? (query only) ..............CH<x>:OPTIcal:WLENgth ......................CH<x>:OPTIcal:WLENgth:LIST? (query only) ................CH<x>:PRObe:GAIN? (query only) .................... DPO7OE1 Optical Probe User Manual...
  • Page 10: Software License Agreement

    2. Transfer the Program to any person or organization outside of Customer or the corporation of which Customer is a part without the prior written consent of Tektronix, except in connection with the transfer of the equipment within which the programs are encoded or incorporated;...
  • Page 11 Program may be used. Title to the Program and all copies thereof, but not the media on which the Program or copies may reside, shall be and remain with Tektronix or others for whom Tektronix has obtained a respective licensing right.
  • Page 12 POSSIBILITY OF SUCH DAMAGES. THIRD-PARTY DISCLAIMER. Except as expressly agreed otherwise, third parties from whom Tektronix may have obtained a licensing right do not warrant the program, do not assume any liability with respect to its use, and do not undertake to furnish any support or information relating thereto.
  • Page 13 Software license agreement DPO7OE1 Optical Probe User Manual...
  • Page 14: Important Safety Information

    Only qualified personnel who are aware of the hazards involved should remove the cover for repair, maintenance, or adjustment. Before use, always check the product with a known source to be sure it is operating correctly. This product is not intended for detection of hazardous voltages. DPO7OE1 Optical Probe User Manual...
  • Page 15: Service Safety Summary

    Do not service alone. Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present. Verify safety after repair. Always recheck ground continuity and mains dielectric strength after performing a repair. viii DPO7OE1 Optical Probe User Manual...
  • Page 16: Terms In The Manual

    (This symbol may also be used to refer the user to ratings in the manual.) The following symbols may appear on the product: DPO7OE1 Optical Probe User Manual...
  • Page 17 Important safety information DPO7OE1 Optical Probe User Manual...
  • Page 18: Compliance Information

    This section lists the EMC (electromagnetic compliance), safety, and environmental standards with which the instrument complies. Questions about the following compliance information may be directed to the following address: Tektronix, Inc. PO Box 500, MS 19‐045 Beaverton, OR 97077, USA www.tek.com Environmental compliance This section provides information about the environmental impact of the product.
  • Page 19 Compliance Information DPO7OE1 Optical Probe User Manual...
  • Page 20: Preface

    Appendix A describes the Programming Interface (PI) commands. ■ Related documentation The DPO7OE1 is used as part of a larger instrument system. Measurement, calibration, and other settings are set from the main instrument controls. See the instrument online help and documentation for information on setting up and taking measurements, instrument specifications, programming commands, and performance verification procedures.
  • Page 21 Preface DPO7OE1 Optical Probe User Manual...
  • Page 22: Getting Started

    MSO70000 C/DX/SX model oscilloscopes for high-speed optical signal verification. The DPO7OE1 is intended to be used as a test and measurement tool for general purpose characterization of ultra-fast optical signals, and for physical layer conformance testing of very-high bit rate, fiber-optic time-domain optical signals such as 100 Gb/s telecommunication or data communication signals.
  • Page 23 Figure 2: DPO7OE1 with shuttle detached from carrier Optical signals may also be acquired on a higher-bandwidth ATI channel by decoupling the DPO7OE1 shuttle from its carrier and coupling the shuttle RF output to the ATI 1.85 mm input connector on the oscilloscope. Acquiring signals...
  • Page 24: Key Features

    Getting started Figure 3: DPO7OE1 supports multiple optical inputs and multi-carrier configurations Key features All DPO7OE1 optical probes are custom configured, high-bandwidth optical acquisition modules suitable for use in a variety of test and measurement applications and systems. Key features of the DPO7OE1 include: High bandwidth, real-time optical signal acquisition with responsivity from ■...
  • Page 25: Options And Accessories

    Certificate of Traceable Calibration One year warranty Optional accessories The following optional accessory is available: Accessory Tektronix part number Optical connector cleaner 006-8327-xx Option FC/APC limits the probe responsiveness to the wavelength range 1260 nm to 1650 nm. DPO7OE1 Optical Probe User Manual...
  • Page 26: Required And Recommended Oscilloscope Software

    Figure 4: Hard case accessory Required and recommended oscilloscope software Required oscilloscope The DPO7OE1 probe is compatible with all DPO70000SX, MSO/DPO70000DX, software version and MSO/DPO70000C Series oscilloscopes. To use the DPO7OE1, these oscilloscopes must be running one of the following firmware versions: 70 GHz oscilloscope models: Version 10.8.0 or later.
  • Page 27: Installation

    Getting started Recommended The DPO7OE1 optical probe enables deep analysis of PAM4 and PAM2 (NRZ) oscilloscope application signaling by using the following Tektronix DPOJET Jitter and Eye Analysis and software PAM4 Analysis software installed on the oscilloscope. Application software Description...
  • Page 28: Tekconnect Probe Installation

    Getting started TekConnect probe The following procedure describes how to connect the DPO7OE1 to the oscilloscope. installation Figure 5: Connecting the DPO7OE1 probe to the oscilloscope 1. Remove the probe from the hard case. 2. If necessary, attach the probe shuttle to the carrier: a.
  • Page 29: Ati Channel Installation

    Getting started ATI channel installation The following procedure describes how to connect the DPO7OE1 probe shuttle to an ATI channel on the oscilloscope. Before you install the probe shuttle on the ATI channel, install the probe on the oscilloscope TekConnect Channel 1. See TekConnect probe installation page 7.
  • Page 30 6. Tighten the nut on the shuttle counter-clockwise (left) using a torque wrench set to 8 in-lbs. to secure the shuttle to the ATI bracket. Once the probe shuttle has been connected to the oscilloscope, the probe will be automatically detected by the system. DPO7OE1 Optical Probe User Manual...
  • Page 31: First Turn On Functional Checks

    Getting started First turn on functional checks 1. When a DPO7OE1 is plugged into a 70k series oscilloscope for the first time, measured S-parameters for the probe are copied from the probe internal memory to build custom correction filters. The message pictured below appears on the screen while this process takes place.
  • Page 32 5. Select Vertical > Vertical Setup. Select the tab for the channel that the probe is attached to. 6. Press the Properties button. The Probe Properties window is displayed. 7. Verify the probe model number and serial number. DPO7OE1 Optical Probe User Manual...
  • Page 33 Getting started DPO7OE1 Optical Probe User Manual...
  • Page 34: Operating Basics

    To prevent loss of optical power or damage to the optical connectors, keep the connectors clean at all times. Check that all connectors and protective caps are clean before connecting them to the probe. See Cleaning optical connectors page 17. DPO7OE1 Optical Probe User Manual...
  • Page 35: Connecting Optical Signals To The Probe

    Operating basics Connecting optical signals to the probe This procedure describes how to connect a fiber optic cable to the DPO7OE1. The DPO7OE1 O/E converter can be connected to optical fibers with a core diameter of up to 50 µm through the FC optical input.
  • Page 36 3. Using finger pressure only, firmly tighten the cable connector or the adapter shell. Once the fiber optic cable has been connected to the probe, the ocsilloscope will be ready to perform measurements on the cable signal. DPO7OE1 Optical Probe User Manual...
  • Page 37: Attenuating Optical Signals

    An additional optical module function that you control from the main instrument is external channel attenuation. External Attenuation lets you enter a number representing any external attenuation you have added to a channel. DPO7OE1 Optical Probe User Manual...
  • Page 38: Cleaning Optical Connectors

    Operating basics Cleaning optical connectors To keep the DPO7OE1 in good operating condition, observe proper cleaning and handling techniques. Small dust particles and oils can easily contaminate optical connectors and reduce or block the signal. Take care to preserve the integrity of the connectors by keeping them free of contamination.
  • Page 39 Lift up on the JAE connector latch and pull the connector away from the probe. This exposes the male fiber end-face behind the JAE connector. Figure 10: Removing the JAE connector from the probe DPO7OE1 Optical Probe User Manual...
  • Page 40 7. Use a cleaning cloth to clean any male fiber end-face input fiber or device that you attach to the JAE connector input. NOTE. Use a similar cleaning method to clean the fiber end-face input fiber or device. DPO7OE1 Optical Probe User Manual...
  • Page 41: Cleaning The Exterior Of The Probe

    This type of interface is only available with single-mode fiber pigtails, so this option limits the usable wavelength range of the DPO7OE1 to 1260 nm to 1650 nm.
  • Page 42 Operating basics Configuration overview Before taking measurements with the DPO7OE1 probe, you should perform the following steps: 1. Install the probe on the oscilloscope. 2. Select Vertical > Vertical Setup to open the Vertical Setup screen. See Vertical Setup settings on page 22.
  • Page 43: Vertical Setup Settings

    This section describes the settings on the Vertical Setup screen. To view the Vertical Setup screen for the probe, select Vertical > Vertical Setup, and then select the oscilloscope channel with the DPO7OE1 probe installed. Figure 12: Vertical Setup screen ■...
  • Page 44 DSP. It then enables DSP and selects the appropriate bandwidth. ■ Click Analog Only to disable Bandwidth Enhancement and return to Analog operation. The Bandwidth drop-down list adds (HW) to the selection indicating a hardware/analog-only filter. DPO7OE1 Optical Probe User Manual...
  • Page 45 Vertical Setup controls. ■ Probe Cal. Click the Probe Cal button to open the Probe Setup screen where you can perform probe compensation. See Probe Setup settings on page 28. DPO7OE1 Optical Probe User Manual...
  • Page 46 Probe Controls. Click the Probe Controls button to open the Probe Controls screen shown below. Figure 13: Probe Controls screen ■ Vertical Zoom. Click Vertical Zoom to enable MultiView Zoom, which allows you to use the Multipurpose knobs to zoom in on the waveform. DPO7OE1 Optical Probe User Manual...
  • Page 47 4. Select the slope and level for each channel. 5. Wait for a sufficient population to be accumulated (the indicator near the To Mean button turns green). Figure 14: Example of initial deskewed waveform 6. Press the To Mean button. DPO7OE1 Optical Probe User Manual...
  • Page 48 7. Repeat steps 4 through 6 multiple times. Since the difference in resolution between ps and fs is large, the first deskew attempt gets you close and the second attempt gets into the fs range. Figure 15: Example of final deskewed waveform DPO7OE1 Optical Probe User Manual...
  • Page 49: Probe Setup Settings

    Figure 16: Probe Setup screen ■ Properties. Click Properties to view the Probe Properties screen, which displays the selected channel number, the probe type and serial number, and the probe status. Figure 17: Probe Properties screen DPO7OE1 Optical Probe User Manual...
  • Page 50 FC (28.05G) option, an entry box appears, as shown above, where you can enter a custom frequency. See Bandwidth for the Flat filter settings page 42. See Bandwidth for the ORR filter settings on page 42. DPO7OE1 Optical Probe User Manual...
  • Page 51 4. After you enter the Wavelength and Reference Power values, click Compensate Go. A message appears while the oscilloscope computes the correct gain. 5. Click OK to save the calculated wavelength and gain. DPO7OE1 Optical Probe User Manual...
  • Page 52 Operating basics 6. The Probe Setup screen will now show an additional User Cal'd radio button with a drop-down list of all user wavelengths. DPO7OE1 Optical Probe User Manual...
  • Page 53: Calibration

    Precise optical measurements require that a dark level compensation has been done beforehand. Dark level compensation measures the average DC output of the DPO7OE1 when no light is present at the optical input. This measured value is then subtracted from all sampled values.
  • Page 54 Temperature Status is Ready. This typically takes 20 minutes to an hour depending on the oscilloscope model. ■ All channel input signals must be removed. ■ If the timebase external reference mode is selected, leave the external reference signal connected and active. DPO7OE1 Optical Probe User Manual...
  • Page 55 Operating basics 2. Select Instrument Calibration. Figure 18: Utility menu on DPO70000 oscilloscopes DPO7OE1 Optical Probe User Manual...
  • Page 56 If you use a drive that has not had SPC run while in the current instrument, you will see a no prior SPC warning message. If you see this warning, run SPC. Figure 19: Calibration menu on DPO70000 oscilloscopes DPO7OE1 Optical Probe User Manual...
  • Page 57 Yellow indicates that the instrument is in the warm up state or that it has been over 30 days since SPC was last run. ■ Red indicates that SPC needs to be run (the temperature has varied more than 5 °C, SPC failed, or SPC has not been run). DPO7OE1 Optical Probe User Manual...
  • Page 58: Optical Filter And Bandwidth Settings

    Fail One or more failures occurred during the signal path compensation procedure. Contact your local Tektronix service representative for further action. Temp The operating temperature is not within 5 °C of the previous signal path compensation.
  • Page 59: Electrical Output

    Overload indicator A red Overload indicator will appear on the oscilloscope screen when the channel has exceeded the dynamic range of the channel into which the DPO7OE1 shuttle is currently attached. As shown below, when you hover the cursor over the indicator, the message Overload will appear.
  • Page 60: Correcting For Conversion Gain

    850 nm, 1310 nm, 1550 nm. Conversion gain has units of V/W. The channel waveform is corrected by dividing the sampled voltage output of the O/E converter by the conversion gain for the wavelength selected in the Probe Setup menu. DPO7OE1 Optical Probe User Manual...
  • Page 61 Operating basics DPO7OE1 Optical Probe User Manual...
  • Page 62: Reference

    This has led to another definition of bandwidth often used in optical systems, known as the electrical bandwidth (BWe). The electrical bandwidth is the frequency f at which the following equation is satisfied: − 3 dBe = 20 log( DPO7OE1 Optical Probe User Manual...
  • Page 63: Bandwidth For The Flat Filter Settings

    28. The electrical -3 dBe bandwidth is used for the Flat filter options. The optical/ electrical converter used in the DPO7OE1 has a frequency response which approximates a 4 order Bessel-Thomson curve with about 30 GHz of optical bandwidth.
  • Page 64: Optical Reference Receiver Performance

    28 GBd data. The graph below shows a typical frequency response of the DPO7OE1 on a DPO77002SX real-time oscilloscope. Figure 22: Fourth order Bessel-Thompson frequency response of the DPO7OE1 Optical Probe and DPO70000SX ATI channel DPO7OE1 Optical Probe User Manual...
  • Page 65 Reference The smooth, controlled system response with the DPO7OE1 and DPO70000SX oscilloscope is possible because the oscilloscope's system software calculates the BT4 filters using the S-parameters unique to the optical probe and the oscilloscope channel. Most real-time oscilloscopes today have a rather sharp roll- off (e.g.
  • Page 66: Appendix A: Programming Interface (Pi) Commands

    For more information about the PI commands supported by your oscilloscope, refer to the MSO/DPO5000/B, DPO7000/C, DPO70000/B/C/D/DX/SX, DSA70000/B/C/D, and MSO70000/C/DX Series Programmer Manual (Tektronix part number 077-0010-24 and above). CH<x>:OPTIcal:RCVR This command sets or queries the Optical Reference Receiver (ORR) DSP filter used to compensate for the applied optical signal.
  • Page 67: X>:Optical:rcvr:uservalue? (Query Only)

    <NR1> is the optical wavelength (in nanometers). USER specifies user-programmed calibration values that can be loaded onto the probe through a separate utility. FACTory specifies using factory calibration values. The second argument defaults to FACTory if none is specified. DPO7OE1 Optical Probe User Manual...
  • Page 68: X>:Optical:wlength:list? (Query Only)

    For example, a common 10x probe has a gain of 0.1. Group Vertical Syntax CH<x>:PRObe:GAIN? Examples CH2:PROBE:GAIN? might return :CH2:PROBE:GAIN 0.1000E+00, indicating that the attached 10X probe delivers 0.1 V to the Channel 2 BNC for every 1.0 V applied to the probe input. DPO7OE1 Optical Probe User Manual...
  • Page 69 Appendix A: Programming Interface (PI) commands DPO7OE1 Optical Probe User Manual...

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