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The instantaneous linewidth measurement of DFB laser with ultrashort delay

An Ying Du Zhen-Hui Xu Ke-Xin

The instantaneous linewidth measurement of DFB laser with ultrashort delay

An Ying, Du Zhen-Hui, Xu Ke-Xin
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  • Abstract views:  691
  • PDF Downloads:  1554
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  • Received Date:  27 March 2013
  • Accepted Date:  27 May 2013
  • Published Online:  05 September 2013

The instantaneous linewidth measurement of DFB laser with ultrashort delay

  • 1. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China;
  • 2. College of Information Engineering, Hebei United University, Tangshan 063009, China
Fund Project:  Project supported by the State Key Program of National Natural Science of China (Grant No. 60938002), the Special-funded Program on National Key Scientific Instunments and Equipment Development of China (Grant No. 2012YQ06016501), and the Natural Science Foundation of Hebei Province, China (Grant No. F2013209331).

Abstract: The instantaneous linewidth in the process of tuning is a very important parameter of laser, however only static linewidth in steady state could be obtained by all kinds of measurement at present. So we proposed a method of measuring instantaneous linewidth by time-frequency analysis based on local mean decomposition, and after its validity of extracting the instantaneous phase noise of simulation signal was proved, we set the heterodyne measurement system with ultrashort delay (about 0.5 ns) which came from 10 cm optical path difference. Finally, we not only extracted the time-frequency spectrum of the beat signal’s phase noise power, but also obtained the instantaneous linewidth of distributed-feedback diode laser under the pulse current for the first time so far as we Rnow.

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