Abstract

We report what is to our knowledge the first experimental demonstration of a photorefractive spatial mode converter (based on mutually pumped phase conjugation) that couples light efficiently from a multimode fiber into a single-mode fiber with an extremely large degree of tolerance to misalignment. Using an argon laser (514.5 nm) and a barium titanate crystal, we have demonstrated that the laser light can be coupled from a multimode fiber (core diameter 100 μm, numerical aperture 0.37) into a single-mode fiber (core diameter 2.9 μm, numerical aperture 0.11), with an efficiency of ~15% and an alignment tolerance of ~100 μm. The coupling efficiency is more than 2 orders of magnitude, and the tolerance to misalignments is more than 30 times better than the corresponding values achievable by conventional techniques.

© 1995 Optical Society of America

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References

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  1. Q. B. He, in Photorefractive Materials, Effects, and Applications, P. Yeh, C. Gu, eds. (Society of Photo-Optical Instrumentation Engineers, Bellingham, Wash., 1993), pp. 59–75, and references cited therein.P. Yeh, Introduction to Photorefractive Nonlinear Optics (Wiley, New York, 1993), pp. 227–240.
  2. S. Weiss, S. Sternklar, B. Fischer, Opt. Lett. 12, 114 (1987).
    [CrossRef] [PubMed]
  3. Q. C. He, J. Shamir, J. G. Duthie, Appl. Opt. 28, 306 (1989).
    [CrossRef] [PubMed]
  4. J. Feinberg, J. Opt. Soc. Am. 72, 46 (1982).
    [CrossRef]
  5. P. Yeh, Appl. Opt. 28, 1961 (1989).
    [CrossRef] [PubMed]

1989 (2)

1987 (1)

1982 (1)

Duthie, J. G.

Feinberg, J.

Fischer, B.

He, Q. B.

Q. B. He, in Photorefractive Materials, Effects, and Applications, P. Yeh, C. Gu, eds. (Society of Photo-Optical Instrumentation Engineers, Bellingham, Wash., 1993), pp. 59–75, and references cited therein.P. Yeh, Introduction to Photorefractive Nonlinear Optics (Wiley, New York, 1993), pp. 227–240.

He, Q. C.

Shamir, J.

Sternklar, S.

Weiss, S.

Yeh, P.

Appl. Opt. (2)

J. Opt. Soc. Am. (1)

Opt. Lett. (1)

Other (1)

Q. B. He, in Photorefractive Materials, Effects, and Applications, P. Yeh, C. Gu, eds. (Society of Photo-Optical Instrumentation Engineers, Bellingham, Wash., 1993), pp. 59–75, and references cited therein.P. Yeh, Introduction to Photorefractive Nonlinear Optics (Wiley, New York, 1993), pp. 227–240.

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Figures (5)

Fig. 1
Fig. 1

Schematic of a photorefractive mode converter (based on MPPC) that can couple light efficiently from the output of a MMF into a SMF.

Fig. 2
Fig. 2

Experimental configuration for the demonstration of fault-tolerant and efficient coupling of light from a MMF into a SMF. M, mirror; BB, beam blockage.

Fig. 3
Fig. 3

Multimode-to-single-mode light coupling efficiency as a function of the power ratio of the beacon and the signal beams.

Fig. 4
Fig. 4

Oscillograms showing the decay and the recovery of the signal transmitted through the SMF when the beacon beam was switched off and on again at an instant when the transmitted power was (a) 54% and (b) 0.01% of the peak value.

Fig. 5
Fig. 5

Oscillograms showing the abrupt drop and the gradual recovery of the signal transmitted through the SMF when the fiber facet was displaced horizontally. The minima of the signal level represent the background that is due to backreflection of the beacon beam from the microscope objective and the fiber.

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