Abstract

The voltage-controllable multichannel filter based on multiply cascaded long-period fiber gratings with a divided coil heater will be proposed and experimentally demonstrated. It has several advantages of the large tuning range in both C- and L-band, multichannel operation, multiwavelength selectivity, and bandwidth controllability. The tunable bandpass filter based on long-period fiber gratings with the broad bandwidth over 6.5 nm, large tuning range over 30 nm, and excellent side mode suppression more than 40 dB will be also discussed.

© 2004 Optical Society of America

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References

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  1. A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erdogan and J. E. Sipe, �??Long-period fiber gratings as band-rejection filters,�?? J. Lightwave Technol. 14, 58-64 (1996).
    [CrossRef]
  2. V. Bhatia, K. A. Murphy, and R. O. Claus, �??Simultaneous Measurement Systems Employing Long-Period Grating Sensors,�?? in Proc. Optical Fiber Sensors-11, 702-705 (1996).
  3. Y. G. Han, C. S. Kim, U. C. Paek, and Y. Chung, �??Performance enhancement of strain and temperature sensors using long period fiber grating,�?? IEICE Trans. on Electronics E83-C, 282-286 (2000).
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    [CrossRef]
  7. S. Y amashita, T. Baba, "Spacing-tunable multiwavelength fiber laser," Electron. Lett. 37, 1015-1017 (2001).
    [CrossRef]
  8. C. S. Kim, R. M. Sova, J. U. Kang, and J. B. Khurgin, �??Novel multi-wavelength cascaded-Raman source based on tunable fiber Sagnac loop filter,�?? in Tech. Dig. OFC 2002, WJ1 (2002).
  9. V. Grubsky, D. S. Starodubov, J. Feinberg, �??Wavelength-selective coupler and add-drop multiplexer using long-period fiber gratings,�?? in Tech. Dig. OFC2000, 28-30 (2000).
  10. D. S. Starodubov, V. Grubsky, and J. Feinberg, �??All-fiber bandpass filter with adjustable transmission using cladding-mode coupling,�?? IEEE Photon. Technol. Lett. 10, 1590-592 (1998).
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  11. Y. G. Han, S. H. Kim, S. B. Lee, U. C. Paek, and Y. Chung, �??Development of a novel core mode blocker with H2-loaded Ge-B co-doped fibers,�?? Electron. Lett. 39, 1107-1108 (2003).
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  12. S. Matsumoto, T. Ohira, M. Takabayashi, K. Yoshiara, T. Sugihara, �??Tunable dispersion equalizer with a divided thin-film heater for 40-Gb/s RZ transmissions,�?? IEEE Photon. Technol. Lett. 13, 827-829 (2001).
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  13. O. Duhem, A. DaCosta, J. F. Henninot, and M. Douay, �??Long period copper-coated grating as an electrically tunable wavelength-selective filter,�?? Electron. Lett. 35, 1014-1016 (1999).
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Appl. Opt. (1)

Electron. Lett. (3)

S. Y amashita, T. Baba, "Spacing-tunable multiwavelength fiber laser," Electron. Lett. 37, 1015-1017 (2001).
[CrossRef]

Y. G. Han, S. H. Kim, S. B. Lee, U. C. Paek, and Y. Chung, �??Development of a novel core mode blocker with H2-loaded Ge-B co-doped fibers,�?? Electron. Lett. 39, 1107-1108 (2003).
[CrossRef]

O. Duhem, A. DaCosta, J. F. Henninot, and M. Douay, �??Long period copper-coated grating as an electrically tunable wavelength-selective filter,�?? Electron. Lett. 35, 1014-1016 (1999).
[CrossRef]

IEEE Photon. Technol. Lett. (3)

D. S. Starodubov, V. Grubsky, and J. Feinberg, �??All-fiber bandpass filter with adjustable transmission using cladding-mode coupling,�?? IEEE Photon. Technol. Lett. 10, 1590-592 (1998).
[CrossRef]

S. Matsumoto, T. Ohira, M. Takabayashi, K. Yoshiara, T. Sugihara, �??Tunable dispersion equalizer with a divided thin-film heater for 40-Gb/s RZ transmissions,�?? IEEE Photon. Technol. Lett. 13, 827-829 (2001).
[CrossRef]

Y. G. Han, C. S. Kim, J. U. Kang, U. C. Paek, and Y. Chung, �??Multiwavelength Raman fiber ring laser based on tunable cascaded long-period fiber gratings�??, IEEE Photon. Technol. Lett. 15, 383-385 (2003).
[CrossRef]

IEICE Trans. on Electronics (1)

Y. G. Han, C. S. Kim, U. C. Paek, and Y. Chung, �??Performance enhancement of strain and temperature sensors using long period fiber grating,�?? IEICE Trans. on Electronics E83-C, 282-286 (2000).

J. Lightwave Technol. (1)

A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erdogan and J. E. Sipe, �??Long-period fiber gratings as band-rejection filters,�?? J. Lightwave Technol. 14, 58-64 (1996).
[CrossRef]

OFC 2002 (1)

C. S. Kim, R. M. Sova, J. U. Kang, and J. B. Khurgin, �??Novel multi-wavelength cascaded-Raman source based on tunable fiber Sagnac loop filter,�?? in Tech. Dig. OFC 2002, WJ1 (2002).

OFC2000 (1)

V. Grubsky, D. S. Starodubov, J. Feinberg, �??Wavelength-selective coupler and add-drop multiplexer using long-period fiber gratings,�?? in Tech. Dig. OFC2000, 28-30 (2000).

Opt. Lett. (1)

Proc. Optical Fiber Sensors (1)

V. Bhatia, K. A. Murphy, and R. O. Claus, �??Simultaneous Measurement Systems Employing Long-Period Grating Sensors,�?? in Proc. Optical Fiber Sensors-11, 702-705 (1996).

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Figures (5)

Fig. 1.
Fig. 1.

Measured transmission characteristics of tunable multichannel filter when the applied voltage increased.

Fig. 2.
Fig. 2.

Schematics of the voltage-controllable multichannel filter based on cascaded LPFGs (a) and the voltage-controllable bandpass filter with a core mode blocker (b). Once the core mode blocker is placed in the middle of two gratings, the tunable bandpass filter can be fabricated.

Fig. 3.
Fig. 3.

The experimental results of the wavelength shift of three channels when the applied voltage increased. The linear fitting was -3.4 nm/V.

Fig. 4.
Fig. 4.

Transmission characteristics of the tunable bandpass filter with the voltage change corresponding to the cladding mode order. Multiple passbands occur in the spectrum because the core mode is generally coupled to several cladding modes in the LPFGs.

Fig. 5.
Fig. 5.

Measured results of the resonant wavelength shift corresponding to the cladding mode order when the applied voltage increased.

Equations (3)

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a Co a Cl Out = T 1 · T 2 T N a Co ( 0 ) a Cl ( 0 ) ,
Δ λ λ 2 Δ n · D ,
Q = V 2 R t = V 2 R n N T ,

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