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New lambda /4 phase-shift method by conversion of refractive index difference and application to 1.5 mu m GaInAsP/InP DFB laser

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5 Author(s)
Shim, J.I. ; Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan ; Lee, K.S. ; Arai, S. ; Suematsu, Y.
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A new method to introduce a phase shift equivalent pi /2 by inversion of the refractive index difference, which can be carried out easily by conventional photolithography, is proposed and applied to a 1.5 mu m GaInAsP/InP DFB laser. The lambda /4-shifted effect was confirmed by observing the lasing spectrum of an antireflection-coated DFB laser below threshold under CW operation.

Published in:

Electronics Letters  (Volume:25 ,  Issue: 24 )