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Butt-end fiber coupling to a surface-emitting Γ-point photonic crystal band edge laser

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5 Author(s)
Park, Yeonsang ; Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea and Inter-university Semiconductor Research Center, Seoul National University, Seoul 151-747, Korea ; Sunghwan Kim ; Moon, Chaeyoung ; Jeon, Heonsu
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The authors demonstrate a compact and efficient fiber coupling scheme for a surface-emitting photonic crystal laser by using a cleaved fiber tip connected to a wavelength-division-multiplexing 1×2 fiber coupler. Simultaneous optical excitation and laser light collection are achieved for a 1.55 μm InGaAsP graphite-lattice Γ-point band edge laser. On comparing with the conventional microphotoluminescence setup based on an objective lens, their direct butt coupling setup is much simpler and yet offers the fiber-coupled output approximately ten times higher. Finite-difference time-domain simulations confirm that the Γ-point band edge laser exhibits the desired vertical emission property and that the fiber coupling efficiency can be as high as 30%.

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Applied Physics Letters  (Volume:90 ,  Issue: 17 )