Abstract

The polarization characteristics of a fiber laser cavity that combines a high-birefringence Er3+-doped elliptical core fiber with a Bragg grating fabricated in a low-birefringence (Low-Bi) fiber are studied. It is shown that, by use of an adequate length of Low-Bi fiber and an intracavity polarization controller, the dependence of the fiber laser’s state of polarization on the pump’s state of polarization can be altered. This fiber laser cavity design allows for the realization of a double-frequency, orthogonally polarized single-mode fiber laser source insensitive to the polarization parameters of the pump source.

© 2000 Optical Society of America

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References

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  1. J. T. Lin, P. R. Morkel, L. Reekie, D. N. Payne, “Polarisation effects in fibre lasers,” in Technical Digest of the 13th European Conference on Optical Communication (European Optical Society, Helsinki, Finland, 1987), p. 109.
  2. J. T. Lin, W. A. Gambling, “Polarisation effects in fibre lasers: phenomena, theory and applications,” in Fiber Laser Sources and Amplifiers II, M J Digonnet, ed., Proc. SPIE1373, 42–53 (1991).
    [CrossRef]
  3. U. Ghera, N. Konforti, M. Tur, “Wavelength tunability in a Nd-doped fiber laser with an intracavity polarizer,” IEEE Photonics Technol. Lett. 4, 4–6 (1992).
    [CrossRef]
  4. U. Ghera, N. Friedman, M. Tur, “A fiber laser with a comb-like spectrum,” IEEE Photonics Technol. Lett. 5, 1159–1161 (1993).
    [CrossRef]
  5. N. Friedman, A. Eyal, M. Tur, “The use of the principal states of polarization to describe tunability in a fiber laser,” IEEE J. Quantum Electron. 33, 642–648 (1997).
    [CrossRef]
  6. M. Douay, T. Feng, P. Bernage, P. Niay, E. Delevaque, T. Georges, “Birefringence effect of optical fiber laser with intracore fiber Bragg grating,” IEEE Photonics Technol. Lett. 4, 844–846 (1992).
    [CrossRef]
  7. D. Pureur, M. Douay, P. Bernage, P. Niay, J. F. Bayon, “Single polarization fiber laser using Bragg gratings in Hi-Bi fibers,” J. Lightwave Technol. 13, 350–355 (1995).
    [CrossRef]
  8. W. H. Loh, J. P. de Sandro, G. J. Cowle, B. N. Samson, A. D. Ellis, “40 GHz optical-millimetre wave generation with a dual polarization distributed feedback fibre laser,” Electron. Lett. 33, 594–595 (1997).
    [CrossRef]
  9. S. Bielawski, D. Derozier, P. Glorieux, “Antiphase dynamics and polarization effects in the Nd-doped fiber laser,” Phys. Rev. A 46, 2811–2822 (1992).
    [CrossRef] [PubMed]
  10. D. Falquier, D. Lande, J. L. Wagener, M. J. F. Digonnet, H. J. Shaw, “Measurements and modeling of the output polarization of Er-doped fiber lasers,” in Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 24–40 (1994).
    [CrossRef]
  11. B. Srinivasan, S. Gupta, R. K. Jain, R. B. Dyott, “Polarization anisotropic gain in elliptical-core rare-earth-doped fibers,” Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 51–55 (1994).
    [CrossRef]
  12. J. Hernandez-Cordero, V. A. Kozlov, A. L. G. Carter, T. F. Morse, “Fiber laser polarization tuning using a Bragg grating in a Hi-Bi fiber,” IEEE Photonics Technol. Lett. 10, 941–943 (1998).
    [CrossRef]
  13. R. Leners, P. L. Francois, G. Stephan, “Simultaneous effects of gain and loss anisotropies on the thresholds of a bipolarization fiber laser,” Opt. Lett. 19, 275–277 (1994).
    [CrossRef] [PubMed]
  14. J. T. Lin, L. Reekie, D. N. Payne, S. B. Poole, “Intensity-dependent frequency splitting in an Er3+-doped fiber laser,” in Conference on Lasers and Electro-Optics, Vol. 7 of 1988 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1988), poster paper TUM 28.
  15. T. Erdogan, V. Mizrahi, “Characterization of UV-induced birefringence in photosensitive Ge-doped silica optical fibers,” J. Opt. Soc. Am. B 11, 2100–2105 (1994).
    [CrossRef]

1998 (1)

J. Hernandez-Cordero, V. A. Kozlov, A. L. G. Carter, T. F. Morse, “Fiber laser polarization tuning using a Bragg grating in a Hi-Bi fiber,” IEEE Photonics Technol. Lett. 10, 941–943 (1998).
[CrossRef]

1997 (2)

W. H. Loh, J. P. de Sandro, G. J. Cowle, B. N. Samson, A. D. Ellis, “40 GHz optical-millimetre wave generation with a dual polarization distributed feedback fibre laser,” Electron. Lett. 33, 594–595 (1997).
[CrossRef]

N. Friedman, A. Eyal, M. Tur, “The use of the principal states of polarization to describe tunability in a fiber laser,” IEEE J. Quantum Electron. 33, 642–648 (1997).
[CrossRef]

1995 (1)

D. Pureur, M. Douay, P. Bernage, P. Niay, J. F. Bayon, “Single polarization fiber laser using Bragg gratings in Hi-Bi fibers,” J. Lightwave Technol. 13, 350–355 (1995).
[CrossRef]

1994 (2)

1993 (1)

U. Ghera, N. Friedman, M. Tur, “A fiber laser with a comb-like spectrum,” IEEE Photonics Technol. Lett. 5, 1159–1161 (1993).
[CrossRef]

1992 (3)

U. Ghera, N. Konforti, M. Tur, “Wavelength tunability in a Nd-doped fiber laser with an intracavity polarizer,” IEEE Photonics Technol. Lett. 4, 4–6 (1992).
[CrossRef]

M. Douay, T. Feng, P. Bernage, P. Niay, E. Delevaque, T. Georges, “Birefringence effect of optical fiber laser with intracore fiber Bragg grating,” IEEE Photonics Technol. Lett. 4, 844–846 (1992).
[CrossRef]

S. Bielawski, D. Derozier, P. Glorieux, “Antiphase dynamics and polarization effects in the Nd-doped fiber laser,” Phys. Rev. A 46, 2811–2822 (1992).
[CrossRef] [PubMed]

Bayon, J. F.

D. Pureur, M. Douay, P. Bernage, P. Niay, J. F. Bayon, “Single polarization fiber laser using Bragg gratings in Hi-Bi fibers,” J. Lightwave Technol. 13, 350–355 (1995).
[CrossRef]

Bernage, P.

D. Pureur, M. Douay, P. Bernage, P. Niay, J. F. Bayon, “Single polarization fiber laser using Bragg gratings in Hi-Bi fibers,” J. Lightwave Technol. 13, 350–355 (1995).
[CrossRef]

M. Douay, T. Feng, P. Bernage, P. Niay, E. Delevaque, T. Georges, “Birefringence effect of optical fiber laser with intracore fiber Bragg grating,” IEEE Photonics Technol. Lett. 4, 844–846 (1992).
[CrossRef]

Bielawski, S.

S. Bielawski, D. Derozier, P. Glorieux, “Antiphase dynamics and polarization effects in the Nd-doped fiber laser,” Phys. Rev. A 46, 2811–2822 (1992).
[CrossRef] [PubMed]

Carter, A. L. G.

J. Hernandez-Cordero, V. A. Kozlov, A. L. G. Carter, T. F. Morse, “Fiber laser polarization tuning using a Bragg grating in a Hi-Bi fiber,” IEEE Photonics Technol. Lett. 10, 941–943 (1998).
[CrossRef]

Cowle, G. J.

W. H. Loh, J. P. de Sandro, G. J. Cowle, B. N. Samson, A. D. Ellis, “40 GHz optical-millimetre wave generation with a dual polarization distributed feedback fibre laser,” Electron. Lett. 33, 594–595 (1997).
[CrossRef]

de Sandro, J. P.

W. H. Loh, J. P. de Sandro, G. J. Cowle, B. N. Samson, A. D. Ellis, “40 GHz optical-millimetre wave generation with a dual polarization distributed feedback fibre laser,” Electron. Lett. 33, 594–595 (1997).
[CrossRef]

Delevaque, E.

M. Douay, T. Feng, P. Bernage, P. Niay, E. Delevaque, T. Georges, “Birefringence effect of optical fiber laser with intracore fiber Bragg grating,” IEEE Photonics Technol. Lett. 4, 844–846 (1992).
[CrossRef]

Derozier, D.

S. Bielawski, D. Derozier, P. Glorieux, “Antiphase dynamics and polarization effects in the Nd-doped fiber laser,” Phys. Rev. A 46, 2811–2822 (1992).
[CrossRef] [PubMed]

Digonnet, M. J. F.

D. Falquier, D. Lande, J. L. Wagener, M. J. F. Digonnet, H. J. Shaw, “Measurements and modeling of the output polarization of Er-doped fiber lasers,” in Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 24–40 (1994).
[CrossRef]

Douay, M.

D. Pureur, M. Douay, P. Bernage, P. Niay, J. F. Bayon, “Single polarization fiber laser using Bragg gratings in Hi-Bi fibers,” J. Lightwave Technol. 13, 350–355 (1995).
[CrossRef]

M. Douay, T. Feng, P. Bernage, P. Niay, E. Delevaque, T. Georges, “Birefringence effect of optical fiber laser with intracore fiber Bragg grating,” IEEE Photonics Technol. Lett. 4, 844–846 (1992).
[CrossRef]

Dyott, R. B.

B. Srinivasan, S. Gupta, R. K. Jain, R. B. Dyott, “Polarization anisotropic gain in elliptical-core rare-earth-doped fibers,” Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 51–55 (1994).
[CrossRef]

Ellis, A. D.

W. H. Loh, J. P. de Sandro, G. J. Cowle, B. N. Samson, A. D. Ellis, “40 GHz optical-millimetre wave generation with a dual polarization distributed feedback fibre laser,” Electron. Lett. 33, 594–595 (1997).
[CrossRef]

Erdogan, T.

Eyal, A.

N. Friedman, A. Eyal, M. Tur, “The use of the principal states of polarization to describe tunability in a fiber laser,” IEEE J. Quantum Electron. 33, 642–648 (1997).
[CrossRef]

Falquier, D.

D. Falquier, D. Lande, J. L. Wagener, M. J. F. Digonnet, H. J. Shaw, “Measurements and modeling of the output polarization of Er-doped fiber lasers,” in Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 24–40 (1994).
[CrossRef]

Feng, T.

M. Douay, T. Feng, P. Bernage, P. Niay, E. Delevaque, T. Georges, “Birefringence effect of optical fiber laser with intracore fiber Bragg grating,” IEEE Photonics Technol. Lett. 4, 844–846 (1992).
[CrossRef]

Francois, P. L.

Friedman, N.

N. Friedman, A. Eyal, M. Tur, “The use of the principal states of polarization to describe tunability in a fiber laser,” IEEE J. Quantum Electron. 33, 642–648 (1997).
[CrossRef]

U. Ghera, N. Friedman, M. Tur, “A fiber laser with a comb-like spectrum,” IEEE Photonics Technol. Lett. 5, 1159–1161 (1993).
[CrossRef]

Gambling, W. A.

J. T. Lin, W. A. Gambling, “Polarisation effects in fibre lasers: phenomena, theory and applications,” in Fiber Laser Sources and Amplifiers II, M J Digonnet, ed., Proc. SPIE1373, 42–53 (1991).
[CrossRef]

Georges, T.

M. Douay, T. Feng, P. Bernage, P. Niay, E. Delevaque, T. Georges, “Birefringence effect of optical fiber laser with intracore fiber Bragg grating,” IEEE Photonics Technol. Lett. 4, 844–846 (1992).
[CrossRef]

Ghera, U.

U. Ghera, N. Friedman, M. Tur, “A fiber laser with a comb-like spectrum,” IEEE Photonics Technol. Lett. 5, 1159–1161 (1993).
[CrossRef]

U. Ghera, N. Konforti, M. Tur, “Wavelength tunability in a Nd-doped fiber laser with an intracavity polarizer,” IEEE Photonics Technol. Lett. 4, 4–6 (1992).
[CrossRef]

Glorieux, P.

S. Bielawski, D. Derozier, P. Glorieux, “Antiphase dynamics and polarization effects in the Nd-doped fiber laser,” Phys. Rev. A 46, 2811–2822 (1992).
[CrossRef] [PubMed]

Gupta, S.

B. Srinivasan, S. Gupta, R. K. Jain, R. B. Dyott, “Polarization anisotropic gain in elliptical-core rare-earth-doped fibers,” Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 51–55 (1994).
[CrossRef]

Hernandez-Cordero, J.

J. Hernandez-Cordero, V. A. Kozlov, A. L. G. Carter, T. F. Morse, “Fiber laser polarization tuning using a Bragg grating in a Hi-Bi fiber,” IEEE Photonics Technol. Lett. 10, 941–943 (1998).
[CrossRef]

Jain, R. K.

B. Srinivasan, S. Gupta, R. K. Jain, R. B. Dyott, “Polarization anisotropic gain in elliptical-core rare-earth-doped fibers,” Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 51–55 (1994).
[CrossRef]

Konforti, N.

U. Ghera, N. Konforti, M. Tur, “Wavelength tunability in a Nd-doped fiber laser with an intracavity polarizer,” IEEE Photonics Technol. Lett. 4, 4–6 (1992).
[CrossRef]

Kozlov, V. A.

J. Hernandez-Cordero, V. A. Kozlov, A. L. G. Carter, T. F. Morse, “Fiber laser polarization tuning using a Bragg grating in a Hi-Bi fiber,” IEEE Photonics Technol. Lett. 10, 941–943 (1998).
[CrossRef]

Lande, D.

D. Falquier, D. Lande, J. L. Wagener, M. J. F. Digonnet, H. J. Shaw, “Measurements and modeling of the output polarization of Er-doped fiber lasers,” in Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 24–40 (1994).
[CrossRef]

Leners, R.

Lin, J. T.

J. T. Lin, L. Reekie, D. N. Payne, S. B. Poole, “Intensity-dependent frequency splitting in an Er3+-doped fiber laser,” in Conference on Lasers and Electro-Optics, Vol. 7 of 1988 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1988), poster paper TUM 28.

J. T. Lin, P. R. Morkel, L. Reekie, D. N. Payne, “Polarisation effects in fibre lasers,” in Technical Digest of the 13th European Conference on Optical Communication (European Optical Society, Helsinki, Finland, 1987), p. 109.

J. T. Lin, W. A. Gambling, “Polarisation effects in fibre lasers: phenomena, theory and applications,” in Fiber Laser Sources and Amplifiers II, M J Digonnet, ed., Proc. SPIE1373, 42–53 (1991).
[CrossRef]

Loh, W. H.

W. H. Loh, J. P. de Sandro, G. J. Cowle, B. N. Samson, A. D. Ellis, “40 GHz optical-millimetre wave generation with a dual polarization distributed feedback fibre laser,” Electron. Lett. 33, 594–595 (1997).
[CrossRef]

Mizrahi, V.

Morkel, P. R.

J. T. Lin, P. R. Morkel, L. Reekie, D. N. Payne, “Polarisation effects in fibre lasers,” in Technical Digest of the 13th European Conference on Optical Communication (European Optical Society, Helsinki, Finland, 1987), p. 109.

Morse, T. F.

J. Hernandez-Cordero, V. A. Kozlov, A. L. G. Carter, T. F. Morse, “Fiber laser polarization tuning using a Bragg grating in a Hi-Bi fiber,” IEEE Photonics Technol. Lett. 10, 941–943 (1998).
[CrossRef]

Niay, P.

D. Pureur, M. Douay, P. Bernage, P. Niay, J. F. Bayon, “Single polarization fiber laser using Bragg gratings in Hi-Bi fibers,” J. Lightwave Technol. 13, 350–355 (1995).
[CrossRef]

M. Douay, T. Feng, P. Bernage, P. Niay, E. Delevaque, T. Georges, “Birefringence effect of optical fiber laser with intracore fiber Bragg grating,” IEEE Photonics Technol. Lett. 4, 844–846 (1992).
[CrossRef]

Payne, D. N.

J. T. Lin, P. R. Morkel, L. Reekie, D. N. Payne, “Polarisation effects in fibre lasers,” in Technical Digest of the 13th European Conference on Optical Communication (European Optical Society, Helsinki, Finland, 1987), p. 109.

J. T. Lin, L. Reekie, D. N. Payne, S. B. Poole, “Intensity-dependent frequency splitting in an Er3+-doped fiber laser,” in Conference on Lasers and Electro-Optics, Vol. 7 of 1988 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1988), poster paper TUM 28.

Poole, S. B.

J. T. Lin, L. Reekie, D. N. Payne, S. B. Poole, “Intensity-dependent frequency splitting in an Er3+-doped fiber laser,” in Conference on Lasers and Electro-Optics, Vol. 7 of 1988 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1988), poster paper TUM 28.

Pureur, D.

D. Pureur, M. Douay, P. Bernage, P. Niay, J. F. Bayon, “Single polarization fiber laser using Bragg gratings in Hi-Bi fibers,” J. Lightwave Technol. 13, 350–355 (1995).
[CrossRef]

Reekie, L.

J. T. Lin, P. R. Morkel, L. Reekie, D. N. Payne, “Polarisation effects in fibre lasers,” in Technical Digest of the 13th European Conference on Optical Communication (European Optical Society, Helsinki, Finland, 1987), p. 109.

J. T. Lin, L. Reekie, D. N. Payne, S. B. Poole, “Intensity-dependent frequency splitting in an Er3+-doped fiber laser,” in Conference on Lasers and Electro-Optics, Vol. 7 of 1988 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1988), poster paper TUM 28.

Samson, B. N.

W. H. Loh, J. P. de Sandro, G. J. Cowle, B. N. Samson, A. D. Ellis, “40 GHz optical-millimetre wave generation with a dual polarization distributed feedback fibre laser,” Electron. Lett. 33, 594–595 (1997).
[CrossRef]

Shaw, H. J.

D. Falquier, D. Lande, J. L. Wagener, M. J. F. Digonnet, H. J. Shaw, “Measurements and modeling of the output polarization of Er-doped fiber lasers,” in Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 24–40 (1994).
[CrossRef]

Srinivasan, B.

B. Srinivasan, S. Gupta, R. K. Jain, R. B. Dyott, “Polarization anisotropic gain in elliptical-core rare-earth-doped fibers,” Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 51–55 (1994).
[CrossRef]

Stephan, G.

Tur, M.

N. Friedman, A. Eyal, M. Tur, “The use of the principal states of polarization to describe tunability in a fiber laser,” IEEE J. Quantum Electron. 33, 642–648 (1997).
[CrossRef]

U. Ghera, N. Friedman, M. Tur, “A fiber laser with a comb-like spectrum,” IEEE Photonics Technol. Lett. 5, 1159–1161 (1993).
[CrossRef]

U. Ghera, N. Konforti, M. Tur, “Wavelength tunability in a Nd-doped fiber laser with an intracavity polarizer,” IEEE Photonics Technol. Lett. 4, 4–6 (1992).
[CrossRef]

Wagener, J. L.

D. Falquier, D. Lande, J. L. Wagener, M. J. F. Digonnet, H. J. Shaw, “Measurements and modeling of the output polarization of Er-doped fiber lasers,” in Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 24–40 (1994).
[CrossRef]

Electron. Lett. (1)

W. H. Loh, J. P. de Sandro, G. J. Cowle, B. N. Samson, A. D. Ellis, “40 GHz optical-millimetre wave generation with a dual polarization distributed feedback fibre laser,” Electron. Lett. 33, 594–595 (1997).
[CrossRef]

IEEE J. Quantum Electron. (1)

N. Friedman, A. Eyal, M. Tur, “The use of the principal states of polarization to describe tunability in a fiber laser,” IEEE J. Quantum Electron. 33, 642–648 (1997).
[CrossRef]

IEEE Photonics Technol. Lett. (4)

M. Douay, T. Feng, P. Bernage, P. Niay, E. Delevaque, T. Georges, “Birefringence effect of optical fiber laser with intracore fiber Bragg grating,” IEEE Photonics Technol. Lett. 4, 844–846 (1992).
[CrossRef]

J. Hernandez-Cordero, V. A. Kozlov, A. L. G. Carter, T. F. Morse, “Fiber laser polarization tuning using a Bragg grating in a Hi-Bi fiber,” IEEE Photonics Technol. Lett. 10, 941–943 (1998).
[CrossRef]

U. Ghera, N. Konforti, M. Tur, “Wavelength tunability in a Nd-doped fiber laser with an intracavity polarizer,” IEEE Photonics Technol. Lett. 4, 4–6 (1992).
[CrossRef]

U. Ghera, N. Friedman, M. Tur, “A fiber laser with a comb-like spectrum,” IEEE Photonics Technol. Lett. 5, 1159–1161 (1993).
[CrossRef]

J. Lightwave Technol. (1)

D. Pureur, M. Douay, P. Bernage, P. Niay, J. F. Bayon, “Single polarization fiber laser using Bragg gratings in Hi-Bi fibers,” J. Lightwave Technol. 13, 350–355 (1995).
[CrossRef]

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

Opt. Lett. (1)

Phys. Rev. A (1)

S. Bielawski, D. Derozier, P. Glorieux, “Antiphase dynamics and polarization effects in the Nd-doped fiber laser,” Phys. Rev. A 46, 2811–2822 (1992).
[CrossRef] [PubMed]

Other (5)

D. Falquier, D. Lande, J. L. Wagener, M. J. F. Digonnet, H. J. Shaw, “Measurements and modeling of the output polarization of Er-doped fiber lasers,” in Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 24–40 (1994).
[CrossRef]

B. Srinivasan, S. Gupta, R. K. Jain, R. B. Dyott, “Polarization anisotropic gain in elliptical-core rare-earth-doped fibers,” Doped Fiber Devices and Systems, M. J. Digonnet, ed., Proc. SPIE2289, 51–55 (1994).
[CrossRef]

J. T. Lin, P. R. Morkel, L. Reekie, D. N. Payne, “Polarisation effects in fibre lasers,” in Technical Digest of the 13th European Conference on Optical Communication (European Optical Society, Helsinki, Finland, 1987), p. 109.

J. T. Lin, W. A. Gambling, “Polarisation effects in fibre lasers: phenomena, theory and applications,” in Fiber Laser Sources and Amplifiers II, M J Digonnet, ed., Proc. SPIE1373, 42–53 (1991).
[CrossRef]

J. T. Lin, L. Reekie, D. N. Payne, S. B. Poole, “Intensity-dependent frequency splitting in an Er3+-doped fiber laser,” in Conference on Lasers and Electro-Optics, Vol. 7 of 1988 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1988), poster paper TUM 28.

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Figures (5)

Fig. 1
Fig. 1

Experimental arrangement for (a) Hi-Bi active fiber laser cavity and (b) Low-Bi fiber Bragg grating combined with Hi-Bi active fiber laser cavity: collimator (C), polarization controllers (PC1, PC2), polarizer (P), microscope objectives (O1, O2), bulk mirrors (M1, M2), Babinet–Soleil compensator (BS), analyzer (A), high-pass and low-pass filters (F), and Bragg grating (BG).

Fig. 2
Fig. 2

Degree of polarization for the laser output (Q l ) and for the residual pump (Q p ) for (a) different angles of the pump’s linear polarization and (b) output power characteristics for the pump oriented along the major and the minor axes of the Hi-Bi fiber (b).

Fig. 3
Fig. 3

Maximum degree of polarization (Q l ) for different pump powers and orientations of the pump along (1) the major and (2) the minor axes of the Hi-Bi active fiber.

Fig. 4
Fig. 4

Degree of polarization for different angles of the pump for different lengths of Low-Bi fiber. The results for the two bulk mirrors configurations are also shown for comparison.

Fig. 5
Fig. 5

Degree of polarization for different angles of the pump after adjustments on PC2. Q lmax indicates that Q was maximized with PC2, and Q lmin indicates that Q was minimized with PC2.

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