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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • 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)
http://dx.doi.org/10.1364/OL.9.000177


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Abstract

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

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

Citation
R. C. Youngquist, J. L. Brooks, and H. J. Shaw, "Two-mode fiber modal coupler," Opt. Lett. 9, 177-179 (1984)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-9-5-177

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