Narrow Band-Pass Transmission Filter Consisting of Two Fiber Bragg Gratings with Different Periods

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  • Yabe Yusuke
    Department of Applied Physics, School of Science and Engineering, Waseda University
  • Yamada Yuto
    Department of Applied Physics, School of Science and Engineering, Waseda University
  • Komatsu Shinichi
    Department of Applied Physics, School of Science and Engineering, Waseda University Material Research Laboratory for Bioscience and Photonics, Waseda University

Bibliographic Information

Published
2004
DOI
  • 10.1143/jjap.43.5776
Publisher
The Japan Society of Applied Physics

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We developed a narrow band-pass transmission filter by connecting in series two fiber Bragg gratings (FBGs) with slightly different periods. The filter was fabricated by writing two FBGs directly onto the core of a single optical fiber. The center wavelengths of the element FBGs are 1549.71 nm and 1550.05 nm, their bandwidths are 0.36 nm and 0.42 nm, and their reflectances are 99.8% and 99.9%, respectively. The measured bandwidth (full width at half maximum, FWHM) of the fabricated band-pass filter is 0.052 nm, and the maximum transmittance is −12.5 dB. In order to reduce the transmission loss, we adjusted the period difference between the two element FBGs by temperature control, and achieved a maximum transmittance of −0.3 dB although the bandwidth slightly increased up to 0.092 nm. To obtain the narrower bandwidth of the transmission peak, we fabricated a series-type FBG filter using FBGs with higher reflectance, whose measured band-pass bandwidth was as narrow as 0.033 nm.

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