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Nonlinear intermodulation distortion suppression in coherent analog fiber optic link using electro-optic polymeric

Seong-Ku Kim1, Wei Liu, Qibing Pei

  • 1Department of Electrical Engineering, University of California Los Angeles, 64-147 Engineering IV Building, Los Angeles, California 90095-1594, USA. kimsku@ee.ucla.edu

Optics Express
|April 20, 2011
PubMed
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This study demonstrates a novel electro-optic polymer dual parallel Mach-Zehnder modulator (DPMZM) that effectively suppresses third-order intermodulation distortion (IMD3) in fiber optic links. This breakthrough enhances signal clarity in analog fiber optic communications.

Area of Science:

  • Photonics and Optical Communications
  • Materials Science for Optoelectronics
  • Nonlinear Optics

Background:

  • Third-order intermodulation distortion (IMD3) is a significant impairment in analog fiber optic links, limiting system performance.
  • Electro-optic (EO) modulators are crucial components in fiber optic communication systems.
  • EO polymers offer advantages in fabrication and performance for optical devices.

Purpose of the Study:

  • To fabricate and experimentally validate a linearized dual parallel Mach-Zehnder modulator (DPMZM) using an EO polymer.
  • To demonstrate the suppression of IMD3 in a coherent analog fiber optic link using the developed DPMZM.
  • To investigate the potential of a novel EO chromophore (B10) for advanced fiber optic communication systems.

Main Methods:

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  • Synthesis of a new EO chromophore (B10) and its incorporation into amorphous polycarbonate (APC) for waveguide core material.
  • Fabrication of a DPMZM with MZMs of different lengths, unbalanced couplers, and a phase shifter.
  • Experimental setup for a coherent analog fiber optic link to measure IMD3 suppression using the DPMZM.

    • Main Results:

    • Effective cancellation of IMD3 below the noise floor was achieved in two-tone experiments.
    • Fifth-order distortion (IMD5) became the dominant distortion product after IMD3 suppression.
    • The DPMZM configuration demonstrated simultaneous broadband and shot-noise limited operation.

    Conclusions:

    • The linearized DPMZM based on EO polymer effectively suppresses IMD3, enhancing analog fiber optic link performance.
    • The novel EO chromophore B10 shows promise for high-performance fiber optic communication applications.
    • This technology enables cleaner signal transmission with reduced distortion for advanced communication systems.