Measurements of dynamic linewidth enhancement factor and damping rate for distributed-feedback lasers

Shuenn-Jyi Wang; Robert L. Hartman

doi:10.1117/12.141098

16 February 1993 Measurements of dynamic linewidth enhancement factor and damping rate for distributed-feedback lasers

Shuenn-Jyi Wang, Robert L. Hartman

Proceedings Volume 1788, Sources and Detectors for Fiber Communications; (1993) https://doi.org/10.1117/12.141098
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

The dynamic linewidth enhancement factor, (alpha) , and damping rate, (Gamma) , for distributed feedback (DFB) lasers are obtained at various bias levels by measuring the frequency modulation and amplitude modulation indices of the lasers simultaneously. The (alpha) -value of a DFB lasers is generally reduced with increasing output power except at low bias, and the (Gamma) -value typically increases with output power. The measured results show that ninety percent of the 1.3-micrometers capped-mesa buried heterostructure DFB lasers have (alpha) -values in the range 4 to 7 and (Gamma) -values below 4 X 10¹⁰ s^-1. The 1.3-micrometers lasers have smaller damping rates than the 1.5- micrometers lasers of the same DFB laser structure. Compared with buried heterostructure DFB lasers, multiquantum well (MQW) DFB lasers exhibit a much smaller (alpha) -value and a larger damping rate. For both unstrained and strained 1.5-micrometers MQW-DFB lasers, (alpha) -values as low as 1.5 can be easily realized for these lasers at high output power (>= 10 mW).

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Shuenn-Jyi Wang and Robert L. Hartman "Measurements of dynamic linewidth enhancement factor and damping rate for distributed-feedback lasers", Proc. SPIE 1788, Sources and Detectors for Fiber Communications, (16 February 1993); https://doi.org/10.1117/12.141098

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KEYWORDS

Fiber lasers

Frequency modulation

Amplitude modulation

Heterojunctions

Modulation

Sensors

Fabry–Perot interferometers

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