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Multiple-channel silicon micro-resonator based filters for WDM applications
Optics Express
|June 24, 2009
Summary
Researchers precisely shifted silicon micro-resonator wavelengths by altering perimeters. This enabled the first silicon chip wavelength de-multiplexer without tuning, achieving ~1.8 nm spacing.
Area of Science:
- Photonics
- Materials Science
- Optical Engineering
Background:
- Silicon micro-resonators are key components in optical communication systems.
- Precise control over resonance wavelengths is crucial for wavelength division multiplexing (WDM).
- Current methods often require post-fabrication tuning, adding complexity and cost.
Purpose of the Study:
- To demonstrate predictable resonance wavelength shifts in silicon micro-resonators by perimeter modification.
- To establish a linear model for wavelength shifts based on perimeter changes.
- To realize a silicon-based, multi-channel wavelength de-multiplexer without post-fabrication tuning.
Main Methods:
- Utilizing high-resolution lithography to precisely vary micro-resonator perimeters.
- Conducting detailed experiments to determine the linear coefficient of wavelength shift versus perimeter change.
- Comparing experimental coefficients with simulations on straight waveguides.
- Designing and fabricating an eight-channel wavelength de-multiplexer based on the derived linear model.
Main Results:
- Demonstrated predictable resonance wavelength shifts in silicon micro-resonators.
- Determined a nearly constant linear coefficient for wavelength shifts across C and L telecommunication bands.
- Successfully fabricated an eight-channel wavelength de-multiplexer on a silicon chip.
- Achieved an average channel spacing of ~1.8 nm with a 3dB bandwidth of ~0.7 nm.
- Reported an out-of-band rejection ratio of ~40 dB and low channel crosstalk (
- Observed low channel dropping loss (
Conclusions:
- Perimeter modification offers a predictable method for controlling resonance wavelengths in silicon micro-resonators.
- The developed linear model enables the design of wavelength de-multiplexers without the need for post-fabrication trimming.
- This work presents the first silicon chip-based, eight-channel wavelength de-multiplexer with demonstrated performance metrics suitable for telecommunication bands.
