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Related Experiment Videos

Birefringent interleaver with a ring cavity as a phase-dispersion element.

Chao-Wei Lee1, Ruibo Wang, Pochi Yeh

  • 1Institute of Electro-Optical Engineering, National Sun Yat-sen University, Kaohsiung 804, Taiwan. m9035629@student.nsysu.edu.tw

Optics Letters
|June 10, 2005
PubMed
Summary

We developed a new optical interleaver using a ring cavity, achieving a flat-top spectral passband. This design simplifies manufacturing by utilizing Fresnel reflectivities, enabling excellent channel isolation for optical communications.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Fiber Optics

Background:

  • Optical interleaving is crucial for increasing channel capacity in fiber optic systems.
  • Traditional interleaver designs often require complex and precise thin-film coatings.
  • Achieving a flat-top spectral passband and high channel isolation remains a challenge.

Purpose of the Study:

  • To propose and demonstrate a novel ring-cavity-based flat-top birefringent interleaver.
  • To achieve a flat-top spectral passband without relying on highly accurate thin-film coatings.
  • To investigate the performance of a 25-GHz optical interleaver using this new architecture.

Main Methods:

  • Utilizing a single ring cavity to provide necessary phase shifts for different polarization states.

Related Experiment Videos

  • Employing Fresnel reflectivities at the prism interface for phase shift control.
  • Optimizing incident angle near the Brewster angle for desired interface reflectivities.

    • Main Results:

    • Demonstrated a flat-top spectral passband.
    • Achieved a 0.5-dB passband wider than 0.14 nm (17.5 GHz) for a 25-GHz channel spacing.
    • Exhibited a 25-dB stopband greater than 0.14 nm (17.5 GHz) and channel isolation exceeding 28 dB across the C band.

    Conclusions:

    • The novel ring-cavity design effectively produces a flat-top spectral passband.
    • The use of Fresnel reflectivities simplifies fabrication and reduces reliance on precise coatings.
    • The demonstrated 25-GHz interleaver shows excellent performance characteristics for optical communication applications.