Abstract

A tunable wavelength filter based on an asymmetric single-mode grating fiber fabricated by anisotropic CF4 plasma etching is proposed. The reflection wavelength is shown to shift linearly with the degree of curvature of the bent fiber, affording a center wavelength shift of 3.5 nm at 1550 nm. In this region of wavelength shift, the rejection and half-power width of the measured spectra remain almost constant.

© 2002 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
  4. Hironori Kumazaki, Yoshihisa Yamada, Takamasa Oshima, Seiki Inaba, Kazuhiro Hane, �??Micromachining of Optical Fiber Using Reactive Ion Etching and Its Application,�?? Jpn. J. Appl. Phys. 39, 7142-7144 (2000).
    [CrossRef]
  5. Hironori Kumazaki, Yoshihisa Yamada, Hidetoshi Nakamura, Seiki Inaba, Kazuhiro Hane, �??Tunable Wavelength Filter Using a Bragg Grating Fiber Thinned by Plasma Etching,�?? IEEE. Photon. Technol. Lett. 13, 1206-1208 (2001).
    [CrossRef]

Electron. Lett. (2)

S. Y. Kim, S. B. Lee, S.W. Kwon, S. S. Choi and J. Jeong, �??Channel-switching active add/drop multiplexer with tunable gratings,�?? Electron. Lett. 34, 104-105 (1998).
[CrossRef]

J. L. Cruz, A. Diez, M. V. Andres, A. Segura, B. Ortege and L. Dong, �??Fiber Bragg gratings tuned and chirped using magnetic fields,�?? Electron. Lett. 33, 235-237 (1997).
[CrossRef]

IEEE. Photon. Technol. Lett. (1)

Hironori Kumazaki, Yoshihisa Yamada, Hidetoshi Nakamura, Seiki Inaba, Kazuhiro Hane, �??Tunable Wavelength Filter Using a Bragg Grating Fiber Thinned by Plasma Etching,�?? IEEE. Photon. Technol. Lett. 13, 1206-1208 (2001).
[CrossRef]

Jpn. J. Appl. Phys. (1)

Hironori Kumazaki, Yoshihisa Yamada, Takamasa Oshima, Seiki Inaba, Kazuhiro Hane, �??Micromachining of Optical Fiber Using Reactive Ion Etching and Its Application,�?? Jpn. J. Appl. Phys. 39, 7142-7144 (2000).
[CrossRef]

Opt. Lett. (1)

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Figures (6)

Fig. 1.
Fig. 1.

Cross-section of etched grating fiber

Fig. 2.
Fig. 2.

Experimental setup for tunable-wavelength filter with etched grating fiber and optical circulator

Fig. 3.
Fig. 3.

Reflection spectra of device at various curvature radii

Fig. 4.
Fig. 4.

Shift of reflection wavelength as a function of degree of curvature

Fig. 5.
Fig. 5.

Cross -section model for theoretical calculation of reflection wavelengt

Fig. 6.
Fig. 6.

Variation in PDL with degree of curvature for asymmetric grating fiber

Tables (1)

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Table 1. Polarization dependence loss of asymmetric grating fiber and thinned grating fiber

Equations (3)

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λ t = λ s ( 1 + ε )
ε = y c ( R c + y 1 ) ( tensile )
ε = y c ( R p + y 2 ) ( compressive )

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