Abstract

We use an accousto-opitc method to measure the beat lengths between the LP01 and the LP11 modes propagating both in an elliptical-core polarization-maintaining fiber and in a bow-tie high-birefringence (Hi-Bi) fiber for a wide range of optical wavelengths. The Hi-Bi fiber exhibits considerable polarization splitting in the measured beat lengths at all measured wavelengths. According to theory for circular-core fibers, the beat length should have a minimum at the wavelength at which the two modes have the same group velocity in the fiber. We find that for the elliptical-core fiber such a minimum does not exist in the two-mode region. Based on our measurements we discuss the use of different fiber types in various two-mode devices.

© 1996 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. B. Y. Kim, J. N. Blake, H. E. Engan, H. J. Shaw, Opt. Lett. 11, 389 (1986).
    [CrossRef] [PubMed]
  2. J. O. Askautrud, H. E. Engan, Opt. Lett. 15, 649 (1990).
    [CrossRef] [PubMed]
  3. D. Östling, H. E. Engan, Opt. Lett. 20, 1247 (1995).
    [CrossRef] [PubMed]
  4. S. H. Yun, I. K. Hwang, B. Y. Kim, Opt. Lett. 21, 27 (1996).
    [CrossRef] [PubMed]
  5. J. N. Blake, B. Y. Kim, H. J. Shaw, Opt. Lett. 11, 177 (1986).
    [CrossRef] [PubMed]
  6. D. Östling, H. E. Engan, Opt. Lett. 21, 192 (1996).
    [CrossRef] [PubMed]
  7. R. B. Dyott, Elliptical Fiber Waveguides (Artech, Boston, Mass., 1995), p. 91.
  8. M. P. Varnham, D. N. Payne, A. J. Barlow, R. D. Birch, IEEE J. Lightwave Technol. 1, 332 (1983).
    [CrossRef]
  9. H. E. Engan, B. Y. Kim, J. N. Blake, H. J. Shaw, IEEE J. Lightwave Technol. 6, 428 (1988).
    [CrossRef]

1996 (2)

1995 (1)

1990 (1)

1988 (1)

H. E. Engan, B. Y. Kim, J. N. Blake, H. J. Shaw, IEEE J. Lightwave Technol. 6, 428 (1988).
[CrossRef]

1986 (2)

1983 (1)

M. P. Varnham, D. N. Payne, A. J. Barlow, R. D. Birch, IEEE J. Lightwave Technol. 1, 332 (1983).
[CrossRef]

Askautrud, J. O.

Barlow, A. J.

M. P. Varnham, D. N. Payne, A. J. Barlow, R. D. Birch, IEEE J. Lightwave Technol. 1, 332 (1983).
[CrossRef]

Birch, R. D.

M. P. Varnham, D. N. Payne, A. J. Barlow, R. D. Birch, IEEE J. Lightwave Technol. 1, 332 (1983).
[CrossRef]

Blake, J. N.

Dyott, R. B.

R. B. Dyott, Elliptical Fiber Waveguides (Artech, Boston, Mass., 1995), p. 91.

Engan, H. E.

Hwang, I. K.

Kim, B. Y.

Östling, D.

Payne, D. N.

M. P. Varnham, D. N. Payne, A. J. Barlow, R. D. Birch, IEEE J. Lightwave Technol. 1, 332 (1983).
[CrossRef]

Shaw, H. J.

Varnham, M. P.

M. P. Varnham, D. N. Payne, A. J. Barlow, R. D. Birch, IEEE J. Lightwave Technol. 1, 332 (1983).
[CrossRef]

Yun, S. H.

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (5)

Fig. 1
Fig. 1

Fiber geometry and propagation constants for the lower-order modes of an elliptical-core fiber (left) and a bow-tie fiber (right). The two beat lengths of interest are denoted by LBx and LBy, where y is the direction of the fast axis in the fiber. The refractive indices of the core and cladding are denoted by nco and ncl, respectively, and k0 = 2π/λ is the free-space wave number.

Fig. 2
Fig. 2

Acousto-optic notch filter configuration for beat-length measurements.

Fig. 3
Fig. 3

Transmission loss of the acousto-optic filter measured at several acoustic frequencies with the Hi-Bi fiber and the Nd-doped source.

Fig. 4
Fig. 4

Acoustic wavelength as a function of acoustic frequency for the Hi-Bi and elliptical-core fibers.

Fig. 5
Fig. 5

Beat lengths between the LP01 and the LP11 modes in (a) a Hi-Bi fiber and (b) an elliptical-core fiber. The squares represent measured values, and the curves represent quadratic approximations. PMF, polarization-maintaining fiber.

Metrics