Abstract

In a slanted Bragg grating, coupling between the fundamental guided mode and the counterpropagative cladding modes result in discrete resonances in the transmission spectrum. These resonances are a drawback when Slanted Bragg Gratings are used for gain flattening of fibres amplifiers. A new method based on a chemical etching of the cladding is proposed leading to an overlap of the resonances and a reduction of the amplitude of the modulation. This method can be applied for any value of photo induced modulation amplitude in the SBG.

© 2006 Optical Society of America

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References

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  1. C. R. Giles, and E. Desurvire, "Modeling erbium-doped fiber amplifiers," J. Lightwave Technol. 9, 271 (1991)
    [CrossRef]
  2. R. Kashyap, "Fiber Bragg gratings," in Optics and Photonics, (Academic Press, 1999).
  3. I. Riant, "Fiber gratings for gain equalisation," in Technical Digest of Optical Amplifiers and their Applications and of Bragg Gratings, Photosensitivity and Poling in Glass waveguides, Invited Papers OAA/BGPP’01, (2001)
  4. R. Kashyap, R. Wyatt and R. J. Campbell, "Wideband gain flattened erbium fibre amplifier using a photosensitive blazed grating," Electron. Lett. 29, 154-156 (1993)
    [CrossRef]
  5. R. Kashyap, R. Wyatt and P. F. McKee, "Wavelength flattened saturated erbium amplifier using multiple side-tip Bragg gratings," Electron. Lett. 29, 1025-1026 (1993).
    [CrossRef]
  6. T. Erdogan and J. E. Sipe, "Tilted fiber phase gratings," J. Opt. Soc. Am. A. 13, 296-313 (1996).
    [CrossRef]
  7. L. Brilland, D. Pureur, J. F. Bayon and E. Delevaque, "Slanted gratings UV-written in photosensitive cladding fibre," Electron. Lett. 35, 234-235 (1999).
    [CrossRef]
  8. G. Laffont and P. Ferdinand, "Sensitivity of slanted fibre Bragg gratings to external refractive index higher than that of silica," Electron. Lett. 37, 289-290 (2001).
    [CrossRef]
  9. I. Riant, C. Muller, T. Lopez, V. Croz, and P Sansonetti, "New and efficient technique for suppressing the peaks induced in fiber slanted Bragg grating spectrum," Tech. Digest of OFC'  2000, (2000) pp 118-120.

2001 (1)

G. Laffont and P. Ferdinand, "Sensitivity of slanted fibre Bragg gratings to external refractive index higher than that of silica," Electron. Lett. 37, 289-290 (2001).
[CrossRef]

1999 (1)

L. Brilland, D. Pureur, J. F. Bayon and E. Delevaque, "Slanted gratings UV-written in photosensitive cladding fibre," Electron. Lett. 35, 234-235 (1999).
[CrossRef]

1996 (1)

T. Erdogan and J. E. Sipe, "Tilted fiber phase gratings," J. Opt. Soc. Am. A. 13, 296-313 (1996).
[CrossRef]

1993 (2)

R. Kashyap, R. Wyatt and R. J. Campbell, "Wideband gain flattened erbium fibre amplifier using a photosensitive blazed grating," Electron. Lett. 29, 154-156 (1993)
[CrossRef]

R. Kashyap, R. Wyatt and P. F. McKee, "Wavelength flattened saturated erbium amplifier using multiple side-tip Bragg gratings," Electron. Lett. 29, 1025-1026 (1993).
[CrossRef]

1991 (1)

C. R. Giles, and E. Desurvire, "Modeling erbium-doped fiber amplifiers," J. Lightwave Technol. 9, 271 (1991)
[CrossRef]

Bayon, J. F.

L. Brilland, D. Pureur, J. F. Bayon and E. Delevaque, "Slanted gratings UV-written in photosensitive cladding fibre," Electron. Lett. 35, 234-235 (1999).
[CrossRef]

Brilland, L.

L. Brilland, D. Pureur, J. F. Bayon and E. Delevaque, "Slanted gratings UV-written in photosensitive cladding fibre," Electron. Lett. 35, 234-235 (1999).
[CrossRef]

Campbell, R. J.

R. Kashyap, R. Wyatt and R. J. Campbell, "Wideband gain flattened erbium fibre amplifier using a photosensitive blazed grating," Electron. Lett. 29, 154-156 (1993)
[CrossRef]

Delevaque, E.

L. Brilland, D. Pureur, J. F. Bayon and E. Delevaque, "Slanted gratings UV-written in photosensitive cladding fibre," Electron. Lett. 35, 234-235 (1999).
[CrossRef]

Desurvire, E.

C. R. Giles, and E. Desurvire, "Modeling erbium-doped fiber amplifiers," J. Lightwave Technol. 9, 271 (1991)
[CrossRef]

Erdogan, T.

T. Erdogan and J. E. Sipe, "Tilted fiber phase gratings," J. Opt. Soc. Am. A. 13, 296-313 (1996).
[CrossRef]

Ferdinand, P.

G. Laffont and P. Ferdinand, "Sensitivity of slanted fibre Bragg gratings to external refractive index higher than that of silica," Electron. Lett. 37, 289-290 (2001).
[CrossRef]

Giles, C. R.

C. R. Giles, and E. Desurvire, "Modeling erbium-doped fiber amplifiers," J. Lightwave Technol. 9, 271 (1991)
[CrossRef]

Kashyap, R.

R. Kashyap, R. Wyatt and R. J. Campbell, "Wideband gain flattened erbium fibre amplifier using a photosensitive blazed grating," Electron. Lett. 29, 154-156 (1993)
[CrossRef]

R. Kashyap, R. Wyatt and P. F. McKee, "Wavelength flattened saturated erbium amplifier using multiple side-tip Bragg gratings," Electron. Lett. 29, 1025-1026 (1993).
[CrossRef]

Laffont, G.

G. Laffont and P. Ferdinand, "Sensitivity of slanted fibre Bragg gratings to external refractive index higher than that of silica," Electron. Lett. 37, 289-290 (2001).
[CrossRef]

McKee, P. F.

R. Kashyap, R. Wyatt and P. F. McKee, "Wavelength flattened saturated erbium amplifier using multiple side-tip Bragg gratings," Electron. Lett. 29, 1025-1026 (1993).
[CrossRef]

Pureur, D.

L. Brilland, D. Pureur, J. F. Bayon and E. Delevaque, "Slanted gratings UV-written in photosensitive cladding fibre," Electron. Lett. 35, 234-235 (1999).
[CrossRef]

Sipe, J. E.

T. Erdogan and J. E. Sipe, "Tilted fiber phase gratings," J. Opt. Soc. Am. A. 13, 296-313 (1996).
[CrossRef]

Wyatt, R.

R. Kashyap, R. Wyatt and P. F. McKee, "Wavelength flattened saturated erbium amplifier using multiple side-tip Bragg gratings," Electron. Lett. 29, 1025-1026 (1993).
[CrossRef]

R. Kashyap, R. Wyatt and R. J. Campbell, "Wideband gain flattened erbium fibre amplifier using a photosensitive blazed grating," Electron. Lett. 29, 154-156 (1993)
[CrossRef]

Electron. Lett. (4)

R. Kashyap, R. Wyatt and R. J. Campbell, "Wideband gain flattened erbium fibre amplifier using a photosensitive blazed grating," Electron. Lett. 29, 154-156 (1993)
[CrossRef]

R. Kashyap, R. Wyatt and P. F. McKee, "Wavelength flattened saturated erbium amplifier using multiple side-tip Bragg gratings," Electron. Lett. 29, 1025-1026 (1993).
[CrossRef]

L. Brilland, D. Pureur, J. F. Bayon and E. Delevaque, "Slanted gratings UV-written in photosensitive cladding fibre," Electron. Lett. 35, 234-235 (1999).
[CrossRef]

G. Laffont and P. Ferdinand, "Sensitivity of slanted fibre Bragg gratings to external refractive index higher than that of silica," Electron. Lett. 37, 289-290 (2001).
[CrossRef]

J. Lightwave Technol. (1)

C. R. Giles, and E. Desurvire, "Modeling erbium-doped fiber amplifiers," J. Lightwave Technol. 9, 271 (1991)
[CrossRef]

J. Opt. Soc. Am. A. (1)

T. Erdogan and J. E. Sipe, "Tilted fiber phase gratings," J. Opt. Soc. Am. A. 13, 296-313 (1996).
[CrossRef]

Other (3)

R. Kashyap, "Fiber Bragg gratings," in Optics and Photonics, (Academic Press, 1999).

I. Riant, "Fiber gratings for gain equalisation," in Technical Digest of Optical Amplifiers and their Applications and of Bragg Gratings, Photosensitivity and Poling in Glass waveguides, Invited Papers OAA/BGPP’01, (2001)

I. Riant, C. Muller, T. Lopez, V. Croz, and P Sansonetti, "New and efficient technique for suppressing the peaks induced in fiber slanted Bragg grating spectrum," Tech. Digest of OFC'  2000, (2000) pp 118-120.

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Figures (6)

Fig. 1.
Fig. 1.

Normalised transmission spectrum of a 2 mm long 6° blazed Bragg grating into a standard singled mode fibre (Corning SMF28). The grating is uncoated and surrounded by air. In grey the transmission spectrum before treatment and in black after treatment. The peaks due to discrete cladding mode coupling can clearly be observed.

Fig. 2:
Fig. 2:

Record of the amplitude of the modulation for different chemical treatment times (t=0 filled diamonds, t=45sec empty diamonds, t=1min45sec filled squares, t=10 min empty squares). Full line with diamonds is the pristine sbg transmission.

Fig. 3.
Fig. 3.

Picture of a fibre diameter after chemical treatment.

Fig. 4.
Fig. 4.

Normalised peak to peak amplitude of the ripple and resonances FWHM as a function of the chemical treatment

Fig. 5.
Fig. 5.

Normalised transmission spectrum of a 2 mm long 6° blazed Bragg grating into a standard singled mode fibre (Corning SMF28). The grating is uncoated and surrounded by air. In grey the transmission spectrum before polishing and in black after polishing.

Fig. 6.
Fig. 6.

Evolution of the wavelength of a peak as a function of the etching depth

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