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Mode beating in spot-size converter lasers |
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| Authors: | Frank HGM 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 |
| Institution: | (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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