Abstract

We present an approach for bandwidth-adjustable optical filter with the dynamic grating in erbium-doped fiber (EDF). The dynamic grating is introduced by the interference of two coherent light beams counter-propagating in the pumped EDF per the phenomenon of gain saturation. The bandwidth of the grating is determined by the length of the grating, i.e., the length of the interference region. With the technique of synthesis of optical coherence function (SOCF), we localize the interference into a range at an arbitrary position along the fiber by modulating the frequency of the two interfering light beams. The length of the range is controlled by adjusting the frequency modulation parameter. In this way, the length of the dynamic grating is controlled and its reflection bandwidth then adjusted. The experimental demonstration is given.

© 2005 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |

  1. S. J. Frisken, �??Transient Bragg reflection gratings in erbium-doped fiber amplifiers,�?? Opt. Lett. 17, 1776-1778 (1992).
    [CrossRef] [PubMed]
  2. B. Fischer, J. L. Zyskind, J. W. Sulhoff, and D. J. DiGiovanni, �??Nonlinear four-wave mixing in erbiumdoped fiber amplifiers,�?? Electron. Lett. 29, 1858-1859 (1993).
    [CrossRef]
  3. B. Fischer, J. L. Zyskind, J. W. Sulhoff, and D. J. DiGiovanni, �??Nonlinear wave mixing and induced gratings in erbium-doped fiber amplifiers,�?? Opt. Lett. 18, 2108-2110 (1993).
    [CrossRef] [PubMed]
  4. S. A. Havstad, B. Fischer, A. E. Willner, and M. G. Wickham, �??Loop-mirror filters based on saturable-gain or -absorber gratings,�?? Opt. Lett. 24, 1466-1468 (1999).
    [CrossRef]
  5. N. Kishi and T. Yazaki, �??Frequency control of a single-frequency fiber laser by cooperatively induced spatial-hole burning,�?? IEEE Photonics Technol. Lett. 11, 182-184 (1999).
    [CrossRef]
  6. Z. He and K. Hotate, �??Distributed fiber optic stress location measurement by arbitrary shaping of optical coherence function,�?? J. Lightwave Technol. 20, 1715-1723 (2002).
    [CrossRef]
  7. B. Zhu, T. Saida, and K. Hotate, �??Variable optical filter using dynamic grating in Er doped fiber controlled by synthesis of optical coherence function: Proposal and experiment verification,�?? IEICE Trans. Electron. E86-C, 97-99 (2003).
  8. X. Fan, Z. He, and K. Hotate, �??Novel distributed fiber-optic strain sensor by localizing dynamic grating in polarization-maintaining erbium-doped fiber: proposal and theoretical analysis,�?? Jpn. J. App. Phys. 44, 1101-1106 (2005).
    [CrossRef]
  9. E. Desurvire, �??Analysis of transient gain saturation and recovery in erbium-doped fiber amplifiers,�?? IEEE Photonics Technol. Lett. 1, 196-199 (1989).
    [CrossRef]

Electron. Lett. (1)

B. Fischer, J. L. Zyskind, J. W. Sulhoff, and D. J. DiGiovanni, �??Nonlinear four-wave mixing in erbiumdoped fiber amplifiers,�?? Electron. Lett. 29, 1858-1859 (1993).
[CrossRef]

IEEE Photonics Technol. Lett. (2)

N. Kishi and T. Yazaki, �??Frequency control of a single-frequency fiber laser by cooperatively induced spatial-hole burning,�?? IEEE Photonics Technol. Lett. 11, 182-184 (1999).
[CrossRef]

E. Desurvire, �??Analysis of transient gain saturation and recovery in erbium-doped fiber amplifiers,�?? IEEE Photonics Technol. Lett. 1, 196-199 (1989).
[CrossRef]

IEICE Trans. Electron. (1)

B. Zhu, T. Saida, and K. Hotate, �??Variable optical filter using dynamic grating in Er doped fiber controlled by synthesis of optical coherence function: Proposal and experiment verification,�?? IEICE Trans. Electron. E86-C, 97-99 (2003).

J. Lightwave Technol. (1)

Jpn. J. App. Phys. (1)

X. Fan, Z. He, and K. Hotate, �??Novel distributed fiber-optic strain sensor by localizing dynamic grating in polarization-maintaining erbium-doped fiber: proposal and theoretical analysis,�?? Jpn. J. App. Phys. 44, 1101-1106 (2005).
[CrossRef]

Opt. Lett. (3)

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (5)

Fig. 1.
Fig. 1.

Coherence function synthesized by sinusoidal frequency modulation.

Fig. 2.
Fig. 2.

Experiment setup. VA: variable attenuator; PC: polarization controller; EDF: erbium-doped fiber; IM: intensity modulator; PD: photodiode; LIA: lock-in amplifier; FG: function generator; Ref: reference signal.

Fig. 3.
Fig. 3.

Reflectivity from the dynamic grating without modulation on writing beams.

Fig. 4.
Fig. 4.

Reflectivity from the dynamic grating localized by using the technique of SOCF. The length of the dynamic grating LFWHM = 75 cm.

Fig. 5.
Fig. 5.

(a) Fitted reflection spectra of three different dynamic gratings, (b) normalized graphs of (a).

Equations (5)

Equations on this page are rendered with MathJax. Learn more.

r = κ sinh ( SL ) { g ˜ i ( k w k r ) } sinh ( SL ) S cosh ( SL ) ,
S 2 = κ 2 + [ g ˜ i ( k w k r ) ] 2 .
δν = c 2 πn ( π L ) 2 + κ 2 1 + ( g ˜ L π ) 2 ,
f = f 0 + f 1 cos ( 2 π f 2 t )
L FWHM [ m ] = 30 V pp [ mV ]

Metrics