## Multiwavelength Erbium-doped fiber laser employing nonlinear polarization rotation in a symmetric nonlinear optical loop mirror

Optics Express, Vol. 17, Issue 17, pp. 15160-15166 (2009)

http://dx.doi.org/10.1364/OE.17.015160

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### Abstract

A new multiwavelength Erbium-doped fiber laser is proposed and demonstrated. The intensity-dependent loss induced by nonlinear polarization rotation in a power-symmetric nonlinear optical loop mirror (NOLM) suppresses the mode competition of an Erbium-doped fiber and ensures stable multiwavelength operation at room temperature. The polarization state and its evolution conditions for stable multiwavelength operation in the ring laser cavity are discussed. The number and spectra region of output wavelength can be controlled by adjusting the work states of NOLM.

© 2009 OSA

## 1. Introduction

3. X. M. Liu, X. Q. Zhou, and C. Lu, “Four-wave mixing assisted stability enhancement: theory, experiment, and application,” Opt. Lett. **30**(17), 2257–2259 (2005). [PubMed]

4. X. H. Feng, H. Y. Tam, and P. K. A. Wai, “Stable and uniform multiwavelength erbium-doped fiber laser using nonlinear polarization rotation,” Opt. Express **14**(18), 8205–8210 (2006). [PubMed]

5. Z. X. Zhang, L. Zhan, K. Xu, J. Wu, Y. X. Xia, and J. T. Lin, “Multiwavelength fiber laser with fine adjustment, based on nonlinear polarization rotation and birefringence fiber filter,” Opt. Lett. **33**(4), 324–326 (2008). [PubMed]

6. Z. X. Zhang, L. Zhan, and Y. X. Xia, “Tunable self-seeded multiwavelength Brillouin-Erbium fiber laser with enhanced power efficiency,” Opt. Express **15**(15), 9731–9736 (2007). [PubMed]

## 2. Principle

10. N. J. Doran and D. Wood, “Nonlinear-optical loop mirror,” Opt. Lett. **13**(1), 56–58 (1988). [PubMed]

*q*,

*L*,

*δ*are the twist rate, the absolute length, the beat length, the effective nonlinear length and the attenuation of SMF, respectively.

*P*is the absolute input power of NOLM.

*λ*is the signal wavelength.

*φ*.

*α*is the angle of QWP.

*α*lead to different power-dependent NOCs, as shown in Fig. 1 . In this paper, typical values in calculation are

*α*, the IDL can be obtained. As a result, the balance between the inhomogeneous loss induced by NPR in the symmetric NOLM and the mode competition effect of the EDF can lead to stable multiwavelength oscillations. it must be noticed that for the circular input (

*φ*can be any value.

## 3. Polarization state and its evolution conditions

*m*is integer and is same for the remainder of this paper), the output polarization is independent of power. In this case, low-power transmission is zero and maximum transmission is unity. Apparently, this NOC is not the IDL. For the linear input polarization (

*φ*can be solved to make

*M*represents the effects of other components besides NOLM and PC.

*n*represents the

*n*th oscillation. Equation (4)~(5) can be obtained by adjusting PC in the cavity.

## 4. Experimental results and discussion

## 5. Conclusion

## Acknowledgments

## References and links

1. | A. Bellemare, M. Karasek, M. Rochette, S. A. L. S. Lrochelle, and M. A. T. M. Tetu, “Room temperature multifrequency erbium-doped fiber lasers anchored on the ITU Tetu, frequency grid,” J. Lightwave Technol. |

2. | C. L. Zhao, X. F. Yang, C. Lu, N. J. Hong, X. Guo, P. R. Chaudhuri, and X. Y. Dong, “Switchable multi-wavelength erbium-doped fiber lasers by using cascaded fiber Bragg gratings written in high birefringence fiber,” Opt. Commun. |

3. | X. M. Liu, X. Q. Zhou, and C. Lu, “Four-wave mixing assisted stability enhancement: theory, experiment, and application,” Opt. Lett. |

4. | X. H. Feng, H. Y. Tam, and P. K. A. Wai, “Stable and uniform multiwavelength erbium-doped fiber laser using nonlinear polarization rotation,” Opt. Express |

5. | Z. X. Zhang, L. Zhan, K. Xu, J. Wu, Y. X. Xia, and J. T. Lin, “Multiwavelength fiber laser with fine adjustment, based on nonlinear polarization rotation and birefringence fiber filter,” Opt. Lett. |

6. | Z. X. Zhang, L. Zhan, and Y. X. Xia, “Tunable self-seeded multiwavelength Brillouin-Erbium fiber laser with enhanced power efficiency,” Opt. Express |

7. | X. H. Feng, H. Y. Tam, H. L. Liu, and P. K. A. Wai, “Multiwavelength erbium-doped fiber laser employing a nonlinear optical loop mirror,” Opt. Commun. |

8. | Z. X. Zhang, K. Xu, J. Wu, X. B. Hong, and J. T. Lin, “Multiwavelength figure-of-eight fiber laser with a nonlinear optical loop mirror,” Laser Phys. Lett. |

9. | E. A. Kuzin, J. A. Andrade-Lucio, B. Ibarra Escamilla, R. Rojas-Laguna, and J. Sanchez-Mondragon, “Nonlinear optical loop mirror using the nonlinear polarization rotation effect,” Opt. Commun. |

10. | N. J. Doran and D. Wood, “Nonlinear-optical loop mirror,” Opt. Lett. |

11. | E. A. Kuzin, N. Korneev, J. W. Haus, and B. Ibarra-Escamilla, “Theory of nonlinear loop mirrors with twisted low-birefringence fiber,” J. Opt. Soc. Am. B |

12. | O. Pottiez, E. A. Kuzin, B. Ibarra-Escamilla, and F. Méndez-Martínez, “Theoretical investigation of the NOLM with highly twisted fibre and a |

**OCIS Codes**

(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators

(060.2410) Fiber optics and optical communications : Fibers, erbium

(140.3560) Lasers and laser optics : Lasers, ring

(190.3270) Nonlinear optics : Kerr effect

(190.4370) Nonlinear optics : Nonlinear optics, fibers

**ToC Category:**

Fiber Optics and Optical Communications

**History**

Original Manuscript: June 22, 2009

Revised Manuscript: August 1, 2009

Manuscript Accepted: August 2, 2009

Published: August 11, 2009

**Citation**

Jiajun Tian, Yong Yao, Yunxu Sun, Xuelian Yu, and Deying Chen, "Multiwavelength Erbium-doped fiber laser em-
ploying nonlinear polarization rotation in a symmetric nonlinear optical loop mirror," Opt. Express **17**, 15160-15166 (2009)

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-17-15160

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### References

- A. Bellemare, M. Karasek, M. Rochette, S. A. L. S. Lrochelle, and M. A. T. M. Tetu, “Room temperature multifrequency erbium-doped fiber lasers anchored on the ITU Tetu, frequency grid,” J. Lightwave Technol. 18(6), 825–831 (2000).
- C. L. Zhao, X. F. Yang, C. Lu, N. J. Hong, X. Guo, P. R. Chaudhuri, and X. Y. Dong, “Switchable multi-wavelength erbium-doped fiber lasers by using cascaded fiber Bragg gratings written in high birefringence fiber,” Opt. Commun. 230(4-6), 313–317 (2004).
- X. M. Liu, X. Q. Zhou, and C. Lu, “Four-wave mixing assisted stability enhancement: theory, experiment, and application,” Opt. Lett. 30(17), 2257–2259 (2005). [PubMed]
- X. H. Feng, H. Y. Tam, and P. K. A. Wai, “Stable and uniform multiwavelength erbium-doped fiber laser using nonlinear polarization rotation,” Opt. Express 14(18), 8205–8210 (2006). [PubMed]
- Z. X. Zhang, L. Zhan, K. Xu, J. Wu, Y. X. Xia, and J. T. Lin, “Multiwavelength fiber laser with fine adjustment, based on nonlinear polarization rotation and birefringence fiber filter,” Opt. Lett. 33(4), 324–326 (2008). [PubMed]
- Z. X. Zhang, L. Zhan, and Y. X. Xia, “Tunable self-seeded multiwavelength Brillouin-Erbium fiber laser with enhanced power efficiency,” Opt. Express 15(15), 9731–9736 (2007). [PubMed]
- X. H. Feng, H. Y. Tam, H. L. Liu, and P. K. A. Wai, “Multiwavelength erbium-doped fiber laser employing a nonlinear optical loop mirror,” Opt. Commun. 268(2), 278–281 (2006).
- Z. X. Zhang, K. Xu, J. Wu, X. B. Hong, and J. T. Lin, “Multiwavelength figure-of-eight fiber laser with a nonlinear optical loop mirror,” Laser Phys. Lett. 5(3), 213–216 (2008).
- E. A. Kuzin, J. A. Andrade-Lucio, B. Ibarra Escamilla, R. Rojas-Laguna, and J. Sanchez-Mondragon, “Nonlinear optical loop mirror using the nonlinear polarization rotation effect,” Opt. Commun. 144(1-3), 60–64 (1997).
- N. J. Doran and D. Wood, “Nonlinear-optical loop mirror,” Opt. Lett. 13(1), 56–58 (1988). [PubMed]
- E. A. Kuzin, N. Korneev, J. W. Haus, and B. Ibarra-Escamilla, “Theory of nonlinear loop mirrors with twisted low-birefringence fiber,” J. Opt. Soc. Am. B 18(7), 919–925 (2001).
- O. Pottiez, E. A. Kuzin, B. Ibarra-Escamilla, and F. Méndez-Martínez, “Theoretical investigation of the NOLM with highly twisted fibre and a λ/4 birefringence bias,” Opt. Commun. 254(1-3), 152–167 (2005).

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