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Mode beating in spot-size converter lasers |
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| Authors: | Frank H.G.M. Wijnands Charles G. Crookes Paul M. Charles Richard M. Ash Ian F. Lealman Michael J. Robertson Anthony E. Kelly Kevin A. Williams Aeneas B. Massara Richard V. Penty Ian H. White |
| Affiliation: | (1) Agilent Technologies, White House Road, Ipswich, IP1 5PB, UK;(2) JDS Uniphase, Professor Holstlaan 4, 5656 AA Eindhoven, The Netherlands;(3) Corning Research Centre, Adastral Park, Martlesham Heath, Ipswich, IP5 3RE, UK;(4) Centre for Communications Research, Department of Electrical Engineering, University of Bristol, Queen's Building, University Walk, Bristol, BS8 1TR, UK;(5) Agilent Technologies, White House Road, Ipswich, IP1 5PB, UK |
| Abstract: | An anomalous modulation in the wavelength spectrum has been observed in lasers with spot-size converters. This intensity modulation is shown to be caused by beating between the fundamental lasing mode and radiation modes in the taper. This results in a periodic modulation in the net gain spectrum, which causes wavelength jumps between adjacent net gain maxima, and a drive current dependent spectral width that is expected to affect system performance. The amplitude of this spectral modulation is reduced significantly by either using an angled rear-facet which reflects the beating radiation modes away from the laser axis, or by using a nonlinear, adiabatic taper. |
| Keywords: | converters coupled mode analysis laser stability modulation semiconductor lasers spectral analysis |
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