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Two-step laterally tapered spot-size converter 1.55-μm DFB laser diode having a high slope efficiency

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8 Author(s)
Park, S.W. ; Opt. Commun. Res. Center, Gwangju ; Han, J.H. ; Han, Y.T. ; Park, S.S.
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We demonstrate a two-step lateral tapered 1.55-mum spot-size converter distributed feedback laser diode (SSC DFB LD) having slope efficiencies as high as 0.457 and 0.319 mW/mA measured at 25 degC and 85 degC, respectively. The SSC DFB LD fabricated by using a nonselective grating process has a double core waveguide structure including a planar buried heterostructure type active waveguide and a ridge type passive waveguide. The fabricated SSC DFB LD operates at 1.553-mum wavelength and shows a far-field pattern in horizontal and vertical directions of 7.3deg and 11.6deg, respectively

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 20 )