Mode beating in spot-size converter lasers

F. H.G.M. Wijnands; C. G. Crookes; P. M. Charles; R. M. Ash; I. F. Lealman; M. J. Robertson; A. E. Kelly; K. A. Williams; A. B. Massara; R. V. Penty; I. H. White

doi:10.1023/A:1020425610870

Mode beating in spot-size converter lasers

F. H.G.M. Wijnands, C. G. Crookes, P. M. Charles, R. M. Ash, I. F. Lealman, M. J. Robertson, A. E. Kelly, K. A. Williams, A. B. Massara, R. V. Penty, I. H. White

Research output: Contribution to journal › Article › peer-review

1 Citation (SciVal)

Abstract

An anomalous modulation in the wavelength spectrum has been observed in lasers with spotsize 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.

Original language	English
Pages (from-to)	959-973
Number of pages	15
Journal	Optical and Quantum Electronics
Volume	34
Issue number	10
DOIs	https://doi.org/10.1023/A:1020425610870
Publication status	Published - 1 Oct 2002

Funding

F.W. thanks W.S. Ring and G. Trott for useful discussions. The authors thank Dr P. Heard from the Interface Analysis Centre, University of Bristol, for carrying out the focussed ion beam etching. K.W., A.M., R.P. and I.W. acknowledge the UK EPSRC Next Generation Laser Diode Initiative for financial support. K.W. acknowledges the Royal Society and AM the UK EPSRC for personal support.

Keywords

Converters
Coupled mode analysis
Laser stability
Modulation
Semiconductor lasers
Spectral analysis

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

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Cite this

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title = "Mode beating in spot-size converter lasers",

abstract = "An anomalous modulation in the wavelength spectrum has been observed in lasers with spotsize 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",

author = "Wijnands, {F. H.G.M.} and Crookes, {C. G.} and Charles, {P. M.} and Ash, {R. M.} and Lealman, {I. F.} and Robertson, {M. J.} and Kelly, {A. E.} and Williams, {K. A.} and Massara, {A. B.} and Penty, {R. V.} and White, {I. H.}",

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T1 - Mode beating in spot-size converter lasers

AU - Wijnands, F. H.G.M.

AU - Crookes, C. G.

AU - Charles, P. M.

AU - Ash, R. M.

AU - Lealman, I. F.

AU - Robertson, M. J.

AU - Kelly, A. E.

AU - Williams, K. A.

AU - Massara, A. B.

AU - Penty, R. V.

AU - White, I. H.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - An anomalous modulation in the wavelength spectrum has been observed in lasers with spotsize 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.

AB - An anomalous modulation in the wavelength spectrum has been observed in lasers with spotsize 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.

KW - Converters

KW - Coupled mode analysis

KW - Laser stability

KW - Modulation

KW - Semiconductor lasers

KW - Spectral analysis

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DO - 10.1023/A:1020425610870

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JO - Optical and Quantum Electronics

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IS - 10

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Mode beating in spot-size converter lasers

Abstract

Funding

Keywords

ASJC Scopus subject areas

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