Optical waveguides – With optical coupler – Particular coupling function
Patent
1997-11-12
2000-10-10
Lee, John D.
Optical waveguides
With optical coupler
Particular coupling function
385 24, 385 39, 385 50, G02B 6293
Patent
active
061309699
ABSTRACT:
A highly efficient channel drop filter. The filter employs a coupling element including a resonator-system between two waveguides, which contains at least two resonant modes. The resonator-system includes one or more interacting resonant cavities which in addition to being coupled to the waveguides, can also be coupled directly among themselves and indirectly among themselves via the waveguides. Each component of the coupling element can be configured or adjusted individually. The geometry and/or dielectric constant/refractive index of the resonator-system are configured so that the frequencies and decay rates of the resonant modes are made to be substantially the same. The filter can achieve 100% signal transfer between the waveguides at certain frequencies, while completely prohibiting signal transfer at other frequencies. In exemplary embodiments, the filter is configured with photonic crystals. In accordance with alternative embodiments of the invention, there are provided channel drop filter devices with flat-top and straight-sidewall lineshape characteristics. These lineshape characteristics are realized by using several resonances to couple the waveguides, and by designing the relative positioning of the frequency of each resonance with respect to one another.
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Fan Shanhui
Haus Hermann A.
Joannopoulos John D.
Villeneuve Pierre R.
Lee John D.
Massachusetts Institute of Technology
Stahl Michael J.
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