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Materials 2017, 10(8), 950; doi:10.3390/ma10080950

The Degree of Temporal Synchronization of the Pulse Oscillations from a Gain-Switched Multimode Semiconductor Laser

Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
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Received: 13 July 2017 / Revised: 9 August 2017 / Accepted: 12 August 2017 / Published: 15 August 2017
(This article belongs to the Special Issue Light Emitting Diodes and Laser Diodes: Materials and Devices)
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Abstract

Langevin noise leads to inhibition of the temporal synchronization of the pulse oscillations from a gain-switched multimode semiconductor laser, resulting in the power reduction in optical beat detection. In this paper, the degree of the temporal synchronization of the pulse oscillations was examined by numerically estimating the output energy in THz time-domain spectroscopy (THz-TDS) using multimode semiconductor laser rate equations that include Langevin noise. The degree was estimated to be 95.5% from the ratio of the averaged THz-TDS output energy for the case where Langevin noise was included to that for when Langevin noise was excluded. Therefore, a gain-switched multimode semiconductor laser can be regarded as equivalent to optical pulses oscillating simultaneously in all modes in actual applications including optical beat detection. View Full-Text
Keywords: semiconductor laser; gain-switching; multimode oscillation; simultaneous pulse oscillation; terahertz dime-domain spectroscopy; Langevin noise; timing and amplitude jitter semiconductor laser; gain-switching; multimode oscillation; simultaneous pulse oscillation; terahertz dime-domain spectroscopy; Langevin noise; timing and amplitude jitter
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Wada, K.; Kitagawa, N.; Matsuyama, T. The Degree of Temporal Synchronization of the Pulse Oscillations from a Gain-Switched Multimode Semiconductor Laser. Materials 2017, 10, 950.

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