Distinction between multimoded and singlemoded self-pulsations in DFB lasers

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Distinction between multimoded and singlemoded self-pulsations in DFB lasers

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DFB lasers with split contacts are shown, by large signal dynamic modelling, to self-pulsate at gigabit frequencies. Two different self-pulsation schemes are discussed: where the laser switches between the higher and lower stop band modes, and where the laser pulsates around a single mode. The second scheme can yield self-pulsation frequencies beyond 20 GHz. Comparisons are made with experimental results.

Inspec keywords: laser modes; distributed feedback lasers; semiconductor lasers; laser frequency stability

Other keywords: large signal dynamic modelling; multimoded self-pulsations; signal travelling wave model; singlemoded self-pulsations; DFB lasers; Brag stopbands; stop band modes; split contacts

Subjects: Lasing action in semiconductors; Design of specific laser systems; Semiconductor lasers

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