A novel method measuring optical fiber nonlinear coefficient based on XPM

Shuangxi Zhang; Xuqiang Wu; Fei Ai; Chengmei Zhang; Bo Zhang; Benli Yu

doi:10.1117/12.837737

20 November 2009 A novel method measuring optical fiber nonlinear coefficient based on XPM

Shuangxi Zhang, Xuqiang Wu, Fei Ai, Chengmei Zhang, Bo Zhang, Benli Yu

Proceedings Volume 7511, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 751117 (2009) https://doi.org/10.1117/12.837737
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

In optic communication systems, the nonlinear effect of the optical fiber is of great importance. There are several methods measuring optical fiber nonlinear coefficient. A novel method measuring optical fiber nonlinear coefficient is proposed, which is based on a Mach-Zehnder interferometer fabricated with 3×3 coupler, polarization controller and so on. According to cross phase modulation (XPM), when two optical waves are injected into the same optical fiber, the phase of one optical wave will be changed because of the other one. So a sinusoidal phase signal will be generated through coupling a sinusoidal modulated high-power laser into one arm of the interferometer, and then the three outputs of the interferometer will contain the sinusoidal phase signal. According to the characteristic of the 3×3 coupler, the phase difference between the three outputs is 2π / 3 . Through mathematics disposition of the three outputs of the interferometer, a couple of orthogonal signals can be yielded. Then the amplitude of the sinusoidal phase signal can be demodulated accurately by arctan method. The length of the optical fiber and the power of the laser can be measured easily, according to expression about the nonlinear phase shift induced by XPM, the optical fiber nonlinear coefficient of certain wavelength will be calculated. The optical fiber nonlinear effect is simulated by the software optisystem, and the process measuring the optical fiber nonlinear coefficient is analyzed in detail based on the schematic design.

Citation Download Citation

Shuangxi Zhang, Xuqiang Wu, Fei Ai, Chengmei Zhang, Bo Zhang, and Benli Yu "A novel method measuring optical fiber nonlinear coefficient based on XPM", Proc. SPIE 7511, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 751117 (20 November 2009); https://doi.org/10.1117/12.837737

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KEYWORDS

Nonlinear optics

Optical fibers

Phase modulation

Modulation

Interferometers

Phase shifts

Phase shift keying

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