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TSO820 and TSO8C17/18

The 8 Series Sampling Oscilloscope provides a comprehensive optical test solution for telecom and datacom applications, as well as general purpose optical component testing. The TSO8C17 and TSO8C18 optical modules provide > 30 GHz optical bandwidth, plus fully integrated Optical Reference Receivers (ORR)1 enabling both single mode and multi-mode conformance testing at 850 nm, 1310 nm, and 1550 nm bands.



Key performance specifications

  • Optical bandwidth above 30 GHz
  • Single mode and multi-mode support for short and long wavelength optical testing
  • Optical Reference Receiver (ORR)Optical Reference Receiver (ORR) is a 4th order Bessel-Thomson filter with a frequency response and tolerances as defined by the standards. Tektronix optimizes the response for best nominal fit and highest quality mask test results support for standard compliance testing


  • Design/verification of High-Speed Components and Systems
  • Signal integrity analysis
  • Compliance test for industry PAM4 standards: 50G, 100G, 200G, 400G IEEE 802.3TM standanrd such as 400GBASE-FR8, 400GBASEDR4, and similar optical direct detect standards.

Key features

  • New system architecture
    • Disaggregated: Separation of the acquisition hardware and software analysis allows the data to be streamed over Ethernet to a connected PC. Users have the capability to scale their analysis platforms to their needs and can connect from anywhere on the network
    • Configurable: The TSO820 mainframe supports user-swappable current and future optical modules
  • Optical modules
    • Accurate testing and characterization of short or long wave optical signals using the high sensitivity and low noise performance of the TSO8C17 or TSO8C18 modules
    • Optical reference receivers (ORR)1 supports specified requirements for standards-mandated compliance testing
    • Extinction ratio measurements with built-in variable ER correction to ensure accuracy and repeatability
  • Analysis with TSOVu®
    • TSOVu: A new software platform that runs independent of the oscilloscope mainframe on users computers or server for both live and post-processing of acquired data
    • TSOVu offers comprehensive analysis of PAM4 optical signals. Includes support for eye diagrams, optical measurements such as TDECQ, and other standard measurements
    • Measurement plug-in designed to interface with the base software that can be dynamically installed as needed
  • High test throughput
    • Simultaneous capture of all channels at a high sample acquisition rate of 300 kS/s
    • Sophisticated Programmatic Interface (PI) for automation environments enables the highest test throughput. Each command supports full data synchronization, eliminating the need for wait / sleep statements


  • Design/Verification of High-Speed Components and Systems
  • Signal integrity analysis
  • Compliance test for industry standards: 25G, 50G, 100G, 200G, 400G IEEE 802.3 standards such as 400GBASE-FR8, 400GBASE-DR4, and similar optical direct detect standards.
Quick Selector Guide


All specifications are guaranteed unless noted otherwise.

Instrument characteristics

Data interfaces
Single mode, FC/PC connector
Symbol rate coverage
Instrument operates over two nominal ranges (typical operation well beyond these)
  • 25.6 to 29 GBd
  • 51.2 to 58 GBd
Wavelength range
1250 nm to 1650 nm
Data insertion loss
External splitter recommended
  • 50/50% (included)
  • 20/80%
  • 10/90%
Data input power (max)
4 dBm at 1310 nm
Input sensitivity

-10 to 4 dBm at 1310 nm (typical, OMA) with PRBS13Q or similar

- 8 to 4 dBm at 1310 nm (typical, OMA) with PRBS31Q, SSPRQ or similar


  • PAM4 modulated signal with TDECQ < 3.4 dB. Sensitivity at higher TDECQ might be lower depending on signal distortion.
  • OR PAM2/NRZ modulated signal passing 100GBASE-LR4 specification using pattern such as PRBS31 or other patterns with same or higher edge density.


Counter accuracy
+/- 10 ppm (typical)

Clock outputs

Clock interface
50 Ω single-ended, AC coupled. 3.5 mm SMA compatible connector
Clock output range
For input data in range 25.6 to 29 GBd
fBd / 2
For input data in range 51.2 to 58 GBd
fBd / 4
Loop bandwidth
0.2 MHz to 10 MHz variable (typical)
Locking range
±1000 ppm
Response of the instrument is as required by IEEE 802.3bs with appropriate 20 dB/decade roll-off
Intrinsic jitter
300 fs with 53.125 GBd PRBS13Q input, 4 MHz Loop Bandwidth
490 fs with 53.125 GBd SSPRQ input, 4 MHz Loop Bandwidth
Output waveform Rise/Fall times (20/80%)
25 ps (typical), 30 ps (max)
Output amplitude
1 Vpp (typical)