Abstract

A practically tunable multiwavelength Raman fiber laser based on few-mode fiber Bragg gratings without additional multichannel filters is investigated. We achieved high quality of the Raman laser output with a high extinction ratio of more than 45 dB. The number of lasing wavelengths can be adjusted by the properties of few-mode Bragg gratings with multiple resonant wavelengths. The lasing wavelength of Raman fiber laser can be readily controlled by the tension and compression strain, which correspond to the directional bending curvature change. The dynamic range of lasing wavelength change was more than 15 nm.

© 2005 Optical Society of America

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References

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Electron. Lett. (1)

Y. G. Han, J. H. Lee, S. H. Kim, and S. B. Lee, �??Tuneable multi-wavelength Raman fiber laser based on fiber Bragg grating cavity with PMF Lyot-Sagnac filter,�?? Electron. Lett. 40, 1475-1476 (2004).
[CrossRef]

IEEE Photonics Technol. Lett. (4)

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 Photonics Technol. Lett. 15, 383-385 (2003).
[CrossRef]

X. Feng, Y. Liu, S. Fu, S. Yuan, and X. Dong, �??Switchable dual-wavelength ytterbium-doped fiber laser based on a few-mode fiber grating,�?? IEEE Photonics Technol. Lett. 16, 762-764 (2004).
[CrossRef]

C. S. Goh, S. Y. Set, and K. Kikuchi, �??Widely tunable optical filters base on fiber Bragg gratings,�?? IEEE Photonics Technol. Lett. 14, 1306-1308 (2002).
[CrossRef]

N. Park and P. F. Wysocki, �??24-line multiwavelength operation of erbium-doped fiber-ring laser,�?? IEEE Photonics Technol. Lett. 8, 1459-1461 (1996).
[CrossRef]

J. Lightwave Technol. (2)

OFC 2001 (1)

F. Koch, P. C. Reeves-Hall, S. V. Chernikov, and J. R. Taylor, �??CW, multiple wavelength, room temperature, Raman fiber ring laser with external 19 channel, 10 GHz pulse generation in a single electro-absorption modulator,�?? in Tech. Dig. OFC 2001 (Baltimore USA, 2001), WDD7.

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, (Anaheim USA, 2002), WJ1.

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Figures (4)

Fig. 1.
Fig. 1.

(a) Experimental setup for multiwavelength Raman fiber laser based on a few-mode FBGs and (b) tuning method based on the symmetrical bending of a flexible metal plate. The cross section of the few-mode fiber was also shown (PC=Polarization controller). The dashed line shows the neutral axis retains its original length even if the metal plate is bent.

Fig. 2.
Fig. 2.

Measured reflection spectra of a few-mode FBG with the bending curvature change (+: the positive bending, -: the negative bending).

Fig. 3.
Fig. 3.

Measured output spectra of the multiwavelength Raman laser with the bending curvature change.

Fig. 4.
Fig. 4.

Lasing wavelength shift as a function of the bending curvature change.

Equations (1)

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Δλ = ( 1 ρ ) ε λ p ,

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