T&M Understanding Optical Spectrum Analyzers (OSAs)
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This article discusses Optical Spectrum Analyzers (OSAs), a key piece of equipment used in test and measurement, with a focus on the AQ6370 Series from Yokogawa. We’ll explore its benefits and features of OSAs from various vendors.
An Optical Spectrum Analyzer analyzes signals within the optical bands. It’s a valuable tool for the design, development, and manufacturing of lasers, LEDs, and other active and passive optical devices used across various sectors, including biomedical and telecommunications.
When choosing an Optical Spectrum Analyzer, several factors should be taken into account:
- Wavelength of the Signal Under Test: The OSA must cover the wavelength range of the signals you’ll be analyzing.
- Wavelength Resolution Required: The required resolution dictates how precisely the OSA can differentiate between closely spaced wavelengths.
- Power of the Optical Signal (Max. and Min.): The OSA needs to handle the power levels of your signals without damage or saturation.
- Fiber Test Capabilities: Consider whether you need to test single-mode or multi-mode fibers, or both.
- Level of Color Analysis Desired: This is important for applications where precise color characterization is needed.
- Built-in Analysis Functions: Look for helpful built-in functions such as OSNR (Optical Signal-to-Noise Ratio), FP-LD (Fabry-Perot Laser Diode), DFB-LD (Distributed Feedback Laser Diode), LED, and SMSR (Side-Mode Suppression Ratio) analysis.
- Internal Storage for Data Files: Sufficient storage is needed to save your measurement data.
Features of AQ6370 Series Optical Spectrum Analyzer (OSA) from Yokogawa
The AQ6370 series from Yokogawa offers a range of features for optical spectrum analysis. The following table outlines some of the key specifications of this OSA:
| Specifications | AQ6370 OSA |
|---|---|
| Range of Wavelength | 350 to 1200 nm |
| Accuracy of wavelength | +/-0.05 nm |
| Resolution of wavelength | 0.02 to 10nm, 0.01 nm |
| Max. input power | 20dBm |
| Sensitivity of optical signal level | -80dBm |
| Dynamic Range | >= 60 dB |
| Internal Storage capacity | 512 MB to save 20K data files |
| Interface types supported | RS232, GPIB, Ethernet |
Other Vendors of Optical Spectrum Analyzer
Several other vendors offer Optical Spectrum Analyzers. Some popular choices include:
- Anritsu Corporation (MS9740A OSA)
- Yenista Optics (OSA20)
- Finisar (WaveAnalyzer 1500S)
- EXFO (IQS-5240S-BP OSA)
- APEX Technologies
Benefits of Optical Spectrum Analyzer
Following are some of the advantages of optical spectrum analyzer.
- Accurately analyzes optical signals, essential for fiber optic communication and laser testing.
- Covers a broad range of wavelengths, making it suitable for DWDM, CWDM, and broadband optical systems.
- Detects even minor spectral variations for detailed optical signal analysis.
- Evaluates signal integrity, power levels, and channel spacing in optical communication systems.
- Helps detect and minimize issues like Optical Signal to Noise Ratio (OSNR) degradation.
- Used in the development, testing, and calibration of optical components such as lasers, filters, and amplifiers.
- Enables network operators to diagnose faults and optimize system performance.
- Helps meet ITU-T and IEEE specifications for optical network components and transmission.
Conclusion
An Optical Spectrum Analyzer (OSA) is a vital tool in fiber optic communication, R&D, and optical component testing, ensuring precise wavelength measurement, signal integrity analysis, and performance optimization. By providing high resolution spectral data, it plays a key role in network troubleshooting, DWDM system monitoring, and optical system development, making it indispensable for telecom, datacom, and photonics industries.
