2005•IEEE Photonics Technology LettersRequires access

Measurement of the linewidth enhancement factor in DFB lasers using a high-resolution optical spectrum analyzer

Asier Villafranca, José A. Lázaro, Íñigo Salinas, Ignacio Garcés

Abstract

Linewidth enhancement factor (also know as chirp parameter is calculated for two distributed feedback lasers using the linewidth asymptotic behavior predicted by Schawles-Townes and Henry. A high-resolution optical spectrum analyzer (BOSA) is used to measure power and linewidth. Comparison with widely accepted network analyzer method is performed with very good agreement.

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Key concepts: Laser linewidth, Spectrum analyzer, Laser, Chirp, Optics, Semiconductor laser theory, Resolution (logic), Spectral density