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OSA20 - optical spectrum analyzer

Fastest diffraction-grating-based instrument operating from 1250 to 1700 nm. Provides fast, accurate, high dynamic range scan. Unique touch-sensitive display with multitouch gesture control.

Spec sheet (PDF) User manual (PDF)

Key features

  • Wavelength range of 1250-1700 nm
  • Wavelength resolution of 20 pm (native), adjustable over 50-2000 pm
  • Sweep speed up to 2000 nm/s
  • Wavelength accuracy of ±10 pm over 1500-1640 nm and ±25 pm over 1250-1700 nm
  • Power level accuracy of ±0.4 dB
  • Built-in calibration source


  • Characterization of WDM signals (coarse WDM, dense WDM and ROADM)
  • Characterization of multiple longitudinal mode laser sources (e.g., Fabry-Perot laser diodes)
  • Long distance transmission system analysis with a recirculating loop
  • Characterization of optical fiber amplifiers (e.g., Erbium Doped Fiber Amplifier)
  • Characterization of singlemode lasers (e.g., distributed feedback Bragg laser diodes and external cavity lasers)
  • Characterization of broadband sources (semiconductor, Raman/fiber optical amplifiers, superluminescent or edge-emitting LED) Read more


Most practical, high performance optical spectrum analyzer on the market.


The OSA20 is the fastest optical spectrum analyzer of its kind with a maximum sweep speed of 2000 nm/s. It uses a fixed monochromator bandwidth of 20 pm and a fixed sampling resolution of 2 pm for all scans. This means every measurement is taken at the highest resolution and the highest accuracy. Sweep speed is determined solely by the choice of the sensitivity level: -55 dBm at 2000 nm/s down to -90 dBm by averaging over 380 scans with HIGH at 0.5 nm/s.


The OSA20’s monochromator utilizes a renowned filter technology. The scanning filter has a 20 pm bandwidth, steep edges and low stray light. Power is integrated over 2 pm steps resulting in 225,001 data points for a 450 nm span. This allows for DWDM channel analysis down to 6.25 GHz spacing. The instrument has a high wavelength accuracy over the full wavelength range with ±10 pm specified over 1500-1640 nm.

Easy to use

The OSA20 is operated through its 12 inch capacitive touch screen with multi-touch gesture control, an industry first. This allows very fast navigation, scrolling and zooming in an intuitive manner. Keyboard and mouse control are also available through the USB interfaces.

OSA20 - optical spectrum analyzer

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