The Dependence Of Feedback Bandwidth On The Spectral Linewidth In External Cavity Semiconductor Lasers For Coherent Lightwave Communication Systems

Il-Whan Oh; Harish R. D. Sunak

doi:10.1117/12.967605

1 January 1987 The Dependence Of Feedback Bandwidth On The Spectral Linewidth In External Cavity Semiconductor Lasers For Coherent Lightwave Communication Systems

Il-Whan Oh, Harish R. D. Sunak

Author Affiliations +

Proceedings Volume 0841, Fiber Optic Networks and Coherent Technology in Fiber Optic Systems II; (1987) https://doi.org/10.1117/12.967605
Event: Cambridge Symposium on Fiber Optics and Integrated Optoelectronics, 1987, Cambridge, MA, United States

Abstract

We show quantitatively for the first time that the feedback bandwidth is a critical parameter controlling the linewidth in external cavity semiconductor lasers. The external cavity structures can be divided into four categories according to their feedback bandwidth Avf and feedback ratio R₃. The limit of linewidth narrowing depends on feedback bandwidth rather than the length of external cavity. For very narrow linewidth (< 10 kHz), the feedback bandwidth required is < 100 kHz, provided optimum choice of the other three critical parameters R₂, R₃, 1_ex is made as defined below.

Citation Download Citation

Il-Whan Oh and Harish R. D. Sunak "The Dependence Of Feedback Bandwidth On The Spectral Linewidth In External Cavity Semiconductor Lasers For Coherent Lightwave Communication Systems", Proc. SPIE 0841, Fiber Optic Networks and Coherent Technology in Fiber Optic Systems II, (1 January 1987); https://doi.org/10.1117/12.967605

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