Coupling variation induced side-lobe suppressed narrowband vertical coupler wavelength filter

광결합 변화에 의해 부모드 억제된 협대역 수직 결합기 파장 여과기

  • Published : 1997.12.01


A novel narrowband wavelength bandpass filter with a large side-lobe suppression was proposed in vertical coupler structure using coupling variation in propagation direction. Combination of a half sinusoidal distributed and a slow coupling schmes was used for narrow bandwidth and small side-lobes. Simulation showed 1.5 nm passband at 1.5507 $\mu\textrm{m}$ and the side-lobes were suppressed more than 20 dB which is two times larger than that of a constant coupling filter. A monolithic two-channel wavelength demultiplexer was proposed and theoretically investigated.



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