Compact 2×2 tapered multimode interference couplers based on SU-8 polymer rectangular waveguides

Liu Yang; Bo Yang; Zhen Sheng; Jianwei Wang; Daoxin Dai; Sailing He
November 2008
Applied Physics Letters;11/17/2008, Vol. 93 Issue 20, p203304
Academic Journal
A 2×2 tapered multimode interference (MMI) coupler is designed and fabricated by using air-cladded SU-8 rectangular waveguide, which is effective in reducing the device size and improving the self-imaging quality. The parabolically tapered MMI section is used to reduce further the size of the MMI coupler. A compact 2×2 coupler with a total MMI size of about 5.3×34.2 μm2 is demonstrated and characterized. The measurement results show that the fabricated 2×2 MMI coupler has relatively small excess loss and nonuniformity for both polarizations in a broad wavelength range (from 1480 to 1630 nm).


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