Novel Optical 90$^{\circ}$ Hybrid Consisting of a Paired Interference Based 2$\,\times\,$4 MMI Coupler, a Phase Shifter and a 2$\,\times\,$2 MMI Coupler

DOI PDF 被引用文献10件

書誌事項

公開日
2010-05
権利情報
  • https://ieeexplore.ieee.org/Xplorehelp/downloads/license-information/IEEE.html
DOI
  • 10.1109/jlt.2010.2042278
公開者
Institute of Electrical and Electronics Engineers (IEEE)

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説明

We propose a novel optical 90° hybrid consisting of a paired-interference based 2 × 4 multimode interference (MMI) coupler, a phase shifter and a 2 × 2 MMI coupler. We theoretically clarified that the proposed device shows superior performances to a conventional 4 × 4 multimode interference coupler from the viewpoint of a wavelength sensitive loss and an operating bandwidth. We fabricated the proposed 90° hybrid using a deep-ridge waveguide with a GalnAsP/InP material system, and experimentally demonstrated quadrature phase response with a low interchannel imbalance, a high common-mode rejection ratio (> 20 dB) and a low phase deviation (< 5°) over 94-nm-wide spectral range.

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