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Wavelength division multiplexing based on apodized planar holographic Bragg reflectors
Christoph M Greiner1, Dmitri Iazikov, Thomas W Mossberg
1LightSmyth Technologies, Incorporated, Eugene, Oregon 97041, USA. cgreiner@lightsmyth.com
Applied Optics
|September 21, 2004
Summary
We demonstrate wavelength division multiplexing using holographic Bragg reflectors (HBRs). This lithographic technique allows for precise control over optical device performance, enabling compact and efficient multiplexers.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Wavelength division multiplexing (WDM) is crucial for increasing optical communication capacity.
- Existing WDM technologies face challenges in miniaturization and precise spectral control.
- Holographic Bragg reflectors (HBRs) offer a potential solution for compact optical devices.
Purpose of the Study:
- To report novel WDM devices based on lithographically fabricated planar HBRs.
- To demonstrate precise bandpass engineering of multiplexer transfer functions.
- To enable compact-footprint WDM devices through hologram overlay.
Main Methods:
- Lithographic fabrication of slab-waveguide-contained planar HBRs.
- Utilizing partial HBR diffractive contour writing and contour displacement for bandpass engineering.
- Implementing hologram overlay for device miniaturization.
- Developing simulation models including second-order apodization and hologram overlap effects.
Main Results:
- Demonstrated four- and eight-channel multiplexers with ~50 GHz and ~100 GHz channel spacings.
- Achieved improved sidelobe suppression and flattop passbands.
- Obtained excellent agreement between simulated and observed spectral passband profiles.
- Validated the impact of apodization and hologram overlap on device performance.
Conclusions:
- Lithographically fabricated planar HBRs are effective for WDM.
- Precise bandpass engineering is achievable through controlled HBR fabrication.
- Hologram overlay enables compact WDM device designs.
- Demonstrated simulation capability facilitates the fabrication of desired passband profiles.
