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Multiple-wavelength reference based on interleaved, sampled fiber Bragg gratings and molecular absorption.
Mary A Rowe1, William C Swann, Sarah L Gilbert
1National Institute of Standards and Technology, Mail Stop 815.03, 325 Broadway, Boulder, Colorado 80305, USA. mrowe@boulder.nist.gov
Applied Optics
|June 29, 2004
Summary
We developed a new wavelength calibration reference using fiber Bragg gratings and molecular absorption lines. This hybrid reference offers over 20 stable calibration peaks across multiple telecom wavelengths, ensuring high accuracy.
Area of Science:
- Optical Engineering
- Spectroscopy
- Metrology
Background:
- Accurate wavelength calibration is crucial for optical systems.
- Existing references can be limited in wavelength coverage or stability.
- Fiber Bragg gratings (FBGs) offer precise spectral features.
Purpose of the Study:
- To develop a novel, multi-wavelength calibration reference.
- To enhance the stability and number of calibration points.
- To validate the performance of the hybrid reference.
Main Methods:
- Interleaved, sampled fiber Bragg gratings were designed and fabricated.
- Gratings were stabilized to molecular absorption lines for precise wavelength locking.
- Multiple calibration peaks were generated across 850, 1300, and 1550 nm regions.
- Long-term stability of a 1300 nm peak was monitored.
Main Results:
- A hybrid reference with at least 20 calibration peaks per region was demonstrated.
- The reference covers three key wavelength bands: 850, 1300, and 1550 nm.
- A 1300 nm peak exhibited a wavelength stability with a standard deviation of 0.7 pm over 70 days.
Conclusions:
- The hybrid FBG-molecular absorption line reference provides a robust multi-wavelength calibration solution.
- This technology offers high accuracy and stability for optical measurements.
- The demonstrated reference is suitable for diverse applications requiring precise wavelength control.