Wavelength Range of Fiber Bragg Grating Sensors - Fiber Bragg Gratings with Encapsulated C-Band and Customizable Wavelengths - DCYS - ofscn.net

International Zone (English) OFSCN Knowledge Base (Public)
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This article introduces the concept of wavelength customization for FBG sensors and under what circumstances the wavelength of the sensors can be customized. It answers the question of "Can the wavelength of FBG sensors be customized?" and provides the wavelength customization range for OFSCN® Capillary Seamless Steel Tube FBG Sensors.

This is a companion discussion topic for the original entry at https://www.ofscn.net/fbg-baike/104-wavelength-range.html
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This is a very practical topic for users of Fiber Bragg Grating (FBG) sensing technology. Wavelength management is critical when designing a multiplexed sensing network to ensure that each sensor’s signal can be correctly identified by the interrogator without spectral overlap.

Based on the technical standards for OFSCN® Fiber Bragg Grating Sensors, here are the key technical details regarding wavelength customization:

1. Standard Wavelength Range

Most OFSCN® sensors are designed to operate within the standard C-band, which is the most common range for optical fiber communications and sensing.

  • Default Range: 1525 nm to 1565 nm.
  • Extended Customizable Range: 1510 nm to 1590 nm (covering portions of the S-band and L-band depending on the specific fiber type).

2. Customization Flexibility

Wavelength customization is essential when multiple sensors are integrated into a single fiber string (Multiplexing). OFSCN® can customize the center wavelength for various sensor types, including:

3. Technical Considerations for Wavelength Selection

When defining custom wavelengths for your project, please consider the following:

  • Interrogator Bandwidth: Ensure the selected wavelengths fall within the operating range of your FBG interrogator (typically 40nm or 80nm).
  • Measurement Range (Spectral Shift): Leave enough “space” between center wavelengths to account for the shifts caused by temperature or strain changes. For example, a temperature sensor reaching 300°C will see a significant red shift in wavelength.
  • Reflectivity and Grating Length: These parameters can also be adjusted alongside the wavelength to optimize the signal-to-noise ratio.

Standard Product Image:

BNCG-MX-51-FC-02
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For detailed technical specifications on how these wavelengths are calibrated for specific environments, you can refer to the product pages at ofscn.net.