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Optics Letters

Optics Letters


  • Vol. 9, Iss. 5 — May. 1, 1984
  • pp: 177–179

Two-mode fiber modal coupler

R. C. Youngquist, J. L. Brooks, and H. J. Shaw  »View Author Affiliations

Optics Letters, Vol. 9, Issue 5, pp. 177-179 (1984)

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When a single-mode fiber is used at a wavelength below the cutoff wavelength, the fiber guides second-order modes, which travel at different phase velocities from the fundamental mode. Periodically stressing this two-mode fiber once per beat length can cause coherent coupling between the modes. Such a modal coupler has been developed and is described here. Coupling to one of the second-order modes has been achieved, leaving less than −40-dB residual power in the fundamental mode. Two couplers have been mounted on a single strand of fiber to construct a Mach–Zehnder interferometer with better than a 30-dB on/off ratio. The coupler is polarization sensitive and can be used as an in-line polarizer. A 36-dB extinction ratio between polarizations has been observed.

© 1984 Optical Society of America

Original Manuscript: December 9, 1983
Manuscript Accepted: February 9, 1984
Published: May 1, 1984

R. C. Youngquist, J. L. Brooks, and H. J. Shaw, "Two-mode fiber modal coupler," Opt. Lett. 9, 177-179 (1984)

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  1. R. C. Youngquist, J. L. Brooks, H. J. Shaw, “A birefringent-fiber polarization coupler,” Opt. Lett. 8, 656–658 (1983). [CrossRef] [PubMed]
  2. S. E. Miller, “On solutions for two waves with periodic coupling,” Bell Syst. Tech. J. 47, 1801–1822 (1968).
  3. R. C. Alferness, L. L. Buhl, “Waveguide electro-optic polarization transformer,” Appl. Phys. Lett. 38, 655–657 (1981). [CrossRef]
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  5. Y. Katsuyama, “Single-mode propagation in 2-mode region of optical fiber by using mode filter,” Electron. Lett. 15, 442–444 (1979). [CrossRef]
  6. H. C. Lefevre, “Single-mode fibre fractional wave devices and polarisation controllers,” Electron. Lett. 16, 778–780 (1980). [CrossRef]
  7. D. Marcuse, Light Transmission Optics, 2nd ed. (Van Nostrand Reinhold, New York, 1982).

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