Abstract

We investigated a source coherence effect on the measurement of the optical fiber nonlinear coefficient by use of dual optical frequencies. We produced coherent and incoherent dual optical frequencies with a self-heterodyne Mach–Zehnder interferometer with and without a delay line, respectively. Our measurement results included both an electrostrictive and a Kerr nonlinear coefficient because of the low modulation frequency. Comparing the coherent case with an incoherent case, we obtained a nonlinear coefficient that was more than 3% higher in the coherent case.

© 2005 Optical Society of America

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References

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2001

T. Omae, K. Nakajima, and M. Ohashi, IEEE Photonics Technol. Lett. 13, 571 (2001).
[CrossRef]

1997

1996

1995

Agrawal, G. P.

G. P. Agrawal, Nonlinear Fiber Optics, 3rd ed. (Academic, San Diego, Calif., 2001), pp. 447–453.

Boskovic, A.

Boyd, R. W.

Buckland, E. L.

Chernikov, S. V.

Fellegara, A.

Gruner-Nielsen, L.

Kato, T.

Levring, O. A.

Martinelli, M.

Melloni, A.

Nakajima, K.

T. Omae, K. Nakajima, and M. Ohashi, IEEE Photonics Technol. Lett. 13, 571 (2001).
[CrossRef]

Nishimura, M.

Ohashi, M.

T. Omae, K. Nakajima, and M. Ohashi, IEEE Photonics Technol. Lett. 13, 571 (2001).
[CrossRef]

Omae, T.

T. Omae, K. Nakajima, and M. Ohashi, IEEE Photonics Technol. Lett. 13, 571 (2001).
[CrossRef]

Philen, D. L.

D. L. Philen, in Technical Digest of the Symposium on Optical Fiber Measurements, P. A. Williams and G. W. Day, eds., NIST Special Publ. 953 (National Institute of Standards and Technology, Boulder, Colorado, 2000), pp. 39–44.

Sasaoka, E.

Suetsugu, Y.

Takagi, M.

Taylor, J. R.

IEEE Photonics Technol. Lett.

T. Omae, K. Nakajima, and M. Ohashi, IEEE Photonics Technol. Lett. 13, 571 (2001).
[CrossRef]

Opt. Lett.

Other

D. L. Philen, in Technical Digest of the Symposium on Optical Fiber Measurements, P. A. Williams and G. W. Day, eds., NIST Special Publ. 953 (National Institute of Standards and Technology, Boulder, Colorado, 2000), pp. 39–44.

G. P. Agrawal, Nonlinear Fiber Optics, 3rd ed. (Academic, San Diego, Calif., 2001), pp. 447–453.

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Figures (5)

Fig. 1
Fig. 1

Experimental setup for the highly coherent CWDFM. AOFS1, AOFS2, acousto-optic frequency shifters; BPF, bandpass filter; ECL, external-cavity laser diode; EDFA, erbium-doped fiber amplifier; FUT, fiber under test; OPM1, OPM2, optical powermeters; P, polarizer; VOA1, VOA2, variable optical attenuators; PC1–PC3, polarization controllers; PR, photoreceiver; ESA, electrical spectrum analyzer.

Fig. 2
Fig. 2

Electrical spectrum showing the beat signals between the 150 - MHz frequency-shifted ECLD and the output from the FUT when the launched optical power was 54.9 mW . RBW, resolution bandwidth; VBW, video bandwidth.

Fig. 3
Fig. 3

Nonlinear phase shift versus input power. Solid line, linear fit; symbols, five independent measurements.

Fig. 4
Fig. 4

Electrical spectrum of the ESA when coherent dual optical frequencies (dotted curve) and incoherent dual optical frequencies (solid curve) were used.

Fig. 5
Fig. 5

Relative deviations of the measured nonlinear phase shifts from a linear fit without delay. Symbols, five independent measurements.

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