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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 11,
  • Issue 7,
  • pp. 071202-
  • (2013)

An alternative phase modulator half-wave voltage measurement based on photonic link

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Abstract

We measure the half-wave voltage of LiNbO<sub>3</sub> phase modulators in a 26-GHz wideband frequency range, and then analyze it by the phase modulation photonic peak gain linked to the interferometric demodulation. The optical interferometer is constructed with two 50:50 couplers and two fiber arms with a 1-m difference in fiber length. The photonic link gain peaks are frequency dependent, as indicated by the differential time delay in the interferometer. The procedure described is a new and practical half-wave voltage measurement method that can accurately predict the nonlinear frequency characteristics of the phase modulator. Moreover, the method can be applied to various types of LiNbO<sub>3</sub> phase modulators.

© 2013 Chinese Optics Letters

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