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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 8 — Apr. 11, 2011
  • pp: 7865–7871

Nonlinear intermodulation distortion suppression in coherent analog fiber optic link using electro-optic polymeric dual parallel Mach-Zehnder modulator

Seong-Ku Kim, Wei Liu, Qibing Pei, Larry R. Dalton, and Harold R. Fetterman  »View Author Affiliations

Optics Express, Vol. 19, Issue 8, pp. 7865-7871 (2011)

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A linearized dual parallel Mach-Zehnder modulator (DPMZM) based on electro-optic (EO) polymer was both fabricated, and experimentally used to suppress the third-order intermodulation distortion (IMD3) in a coherent analog fiber optic link. This optical transmitter design was based on a new EO chromophore called B10, which was synthesized for applications dealing with the fiber-optic communication systems. The chromophore was mixed with amorphous polycarbonate (APC) to form the waveguide’s core material. The DPMZM was configured with two MZMs, of different lengths in parallel, with unbalanced input and output couplers and a phase shifter in one arm. In this configuration each of the MZMs carried a different optical power, and imposed a different depth of optical modulation. When the two optical beams from the MZMs were combined to generate the transmitted signal it was possible to set the IMD3 produced by each modulator to be equal in amplitude but 180° out of phase from the other. Therefore, the resulting IMD3 of the DPMZM transmitter was effectively canceled out during two-tone experiments. A reduction of the IMD3 below the noise floor was observed while leaving fifth-order distortion (IMD5) as the dominant IMD product. This configuration has the capability of broadband operation and shot-noise limited operation simultaneously.

© 2011 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.4110) Optical devices : Modulators
(130.5460) Integrated optics : Polymer waveguides

ToC Category:
Integrated Optics

Original Manuscript: November 2, 2010
Revised Manuscript: February 18, 2011
Manuscript Accepted: February 18, 2011
Published: April 8, 2011

Seong-Ku Kim, Wei Liu, Qibing Pei, Larry R. Dalton, and Harold R. Fetterman, "Nonlinear intermodulation distortion suppression in coherent analog fiber optic link using electro-optic polymeric dual parallel Mach-Zehnder modulator," Opt. Express 19, 7865-7871 (2011)

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