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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 29 — Oct. 10, 2008
  • pp: 5242–5252

Theory and design of a simple tunable Sagnac loop filter for multiwavelength fiber lasers

Mohammad Aleem Mirza and George Stewart  »View Author Affiliations

Applied Optics, Vol. 47, Issue 29, pp. 5242-5252 (2008)

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We present a novel design for a Sagnac loop filter (SLF) whose periodic output spectrum can be fully controlled by cascading a small-birefringence loop (SBL) with a high-birefringence loop (HBL). We develop a detailed theoretical analysis, using the Jones vector method, to calculate the transfer function of the tunable SLF. It has been quantitatively shown that both the transmission coefficient and the phase of the SLF can be controlled by adjusting the orientation angle of the birefringent axes of the SBL in the plane of polarization. The theory has been confirmed by experimental results where a stress-induced SBL was mechanically rotated to tune both the wavelength and the power of a periodic output spectrum. Such a tunable SLF is used in the design of a multiwavelength erbium-doped fiber laser in the C band.

© 2008 Optical Society of America

OCIS Codes
(260.1440) Physical optics : Birefringence
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 13, 2008
Revised Manuscript: July 17, 2008
Manuscript Accepted: September 2, 2008
Published: October 1, 2008

Mohammad Aleem Mirza and George Stewart, "Theory and design of a simple tunable Sagnac loop filter for multiwavelength fiber lasers," Appl. Opt. 47, 5242-5252 (2008)

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  1. F. Ahmed, N. Kishi, and T. Miki, “Multi-wavelength erbium-doped fibre Fabry-Perot laser and its uniform spectral lines power operation,” IEEE Photonics Technol. Lett. 17, 753-755 (2005). [CrossRef]
  2. J. Yao, J. Yao, Z. Deng, and J. Liu, “Multi-wavelength erbium-doped fibre ring laser incorporating an SOA-based phase modulator,” IEEE Photonics Technol. Lett. 17, 756-758 (2005). [CrossRef]
  3. Y. G. Han, G. Kim, J. H. Lee, S. H. Kim, and S. B. Lee, “Lasing wavelength and switchable multi-wavelength fibre laser from 1510 to 1620 nm,” IEEE Photonics Technol. Lett. 17, 989-991 (2005). [CrossRef]
  4. S. Hu, L. Zhan, Y. J. Song, W. Li, S. Y. Luo, and Y. X. Xia, “Switchable multiwavelength erbium-doped fiber ring laser with a multisection high-birefringence fiber loop mirror,” IEEE Photonics Technol. Lett. 17, 1387-1389 (2005). [CrossRef]
  5. Y. G. Han and S. B. Lee, “Flexibly tunable multi-wavelength erbium doped fiber laser based on four-wave mixing effect in dispersion shifted fibers,” Opt. Express 13, 10134-10139(2005). [CrossRef] [PubMed]
  6. X. P. Dong, S. Li, K. S. Chiang, M. N. Ng, and B. C. B. Chu, “Multi-wavelength erbium doped fibre laser based on high-birefringence loop mirror,” Electron. Lett. 36, 1609-1610 (2000). [CrossRef]
  7. M. A. Mirza and G. Stewart, “Design of a multi-wavelength fibre laser using an intra-cavity phase modulator and Sagnac loop filter for sensor applications,” Proc. SPIE 6619, K1-K4 (2007).
  8. M. A. Mirza and G. Stewart, “Multi-wavelength operation of erbium-doped fibre lasers by periodic filtering and phase modulation,” J. Lightwave Technol. (to be published).
  9. X. Fang and R. O. Claus, “Polarization independent all-fibre wavelength division multiplexing based on a Sagnac interferometer,” Opt. Lett. 20, 2146-2148 (1995). [CrossRef] [PubMed]
  10. A. Zhang, H. Liu, M. S. Demokan, and H. Y. Tam, “Stable and broad bandwidth multi-wavelength fiber ring laser incorporating a highly non-linear photonic crystal fiber,” IEEE Photonics Technol. Lett. 17, 2535-2537 (2005). [CrossRef]
  11. S. Li, K. S. Chiang, and W. A. Gambling, “Gain flattening of an erbium doped fiber amplifier using a high birefringence fiber loop mirror,” IEEE Photonics Technol. Lett. 13, 942-944 (2001). [CrossRef]
  12. N. J. C. Libatique and R. K. Jain, “A broadly tunable wavelength-selectable WDM source using a fiber Sagnac loop filter,” IEEE Photonics Technol. Lett. 13, 1283-1285 (2001). [CrossRef]
  13. K. L. Lee, M. P. Fock, S. M. Wan, and C. Shu, “Optically controlled Sagnac loop comb filter,” Opt. Express 12, 6335-6340 (2004). [CrossRef] [PubMed]
  14. H. C. Lefevre, “Single-mode fibre fractional wave devices and polarization controllers,” Electron. Lett. 16, 778-780 (1980). [CrossRef]
  15. I. Yoon, Y. W. Lee, J. Jung, and B. Lee, “Tunable multiwavelength fiber laser employing a comb filter based on a polarization-diversity loop configuration,” J. Lightwave Technol. 24, 1805-1811 (2006). [CrossRef]
  16. J. Marshall, G. Stewart, and G. Whitenett, “Design of a tuneable L-band multi-wavelength laser system for application to gas spectroscopy,” Meas. Sci. Technol. 17, 1023-1031 (2006). [CrossRef]
  17. N. J. Muga, A. N. Pinto, M. F. S. Ferreira, and J. R. F. da Rocha, “Uniform polarization scattering with fiber coil-based polarization controllers,” J. Lightwave Technol. 24, 3932-3943(2006). [CrossRef]
  18. 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, 919-925 (2001). [CrossRef]
  19. E. A. Kuzin, B. Ibarra-Escamilla, D. E. Garcia-Gomez, and J. W. Haus, “Fiber laser mode locked by a Sagnac interferometer with nonlinear polarization rotation,” Opt. Lett. 26, 1559-1561 (2001). [CrossRef]
  20. O. Pottiez, E. A. Kuzin, B. Ibarra-Escamilla, and F. M. Martínez, “Easily tuneable nonlinear optical loop mirror including low-birefringence, highly twisted fibre with invariant output polarization,” Opt. Commun. 229, 147-159 (2004). [CrossRef]
  21. B. Ibarra-Escamilla, E. A. Kuzin, P. Zaca-Morán, R. Grajales-Coutiño, F. M. Martinez, O. Pottiez, R. Rojas-Laguna, and J. W. Haus, “Experimental investigation of the nonlinear optical loop mirror with twisted fiber and birefringence bias,” Opt. Express 13, 10760-10767 (2005). [CrossRef] [PubMed]
  22. R. Ulrich and A. Simon, “Polarization optics of twisted single-mode fibers,” Appl. Opt. 18, 2241-2251 (1979). [CrossRef] [PubMed]
  23. J. M. Estudillo-Ayala, J. Ruiz-Pinales, R. Rojas-Laguna, J. A. Andrade-Lucio, O. G. Ibarra-Manzanno, E. Alvarado-Méndez, M. Torres-Cisneros, B. Ibarra-Escamilla, and E. A. Kuzin, “Analysis of a Sagnac interferometer with low-birefringence twisted fiber,” Opt. Las. Engineer. 39, 635-643(2003). [CrossRef]
  24. D. B. Mortimore, “Fiber loop reflectors,” J. Lightwave Technol. 6, 1217-1224 (1988). [CrossRef]

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