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Document Type |
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Article In Journal |
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Document Title |
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Harmonic and intermodulation distortions and noise associated with two-tone modulation of high-speed semiconductor lasers Harmonic and intermodulation distortions and noise associated with two-tone modulation of high-speed semiconductor lasers |
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Subject |
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physics |
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Document Language |
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English |
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Abstract |
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We present results of modeling and simulation of the harmonic and intermodulation distortions as well
as the intensity noise of high-speed semiconductor lasers under two-tone modulation. Multiple
quantum-well lasers are considered, which are characterized by large differential gain and a modulation
bandwidth of about 25GHz. The study is based on the rate equation model of semiconductor lasers
excited by injection current with two sinusoidal tones separated by a radio frequency. The modulated
laser signal is modeled in both the time and frequency domains. The time domain characteristics
include the fluctuating waveform, while the frequency domain characteristics include the frequency
spectrum of the relative intensity noise (RIN), carrier-to-noise ratio, modulation response, harmonic
distortion, and the second- and third-order intermodulation distortions (IMD2 and IMD3). The analysis is
performed for three frequencies of 5, 15, and 24 GHz, which are, respectively, lower, comparable, and
higher than the laser relaxation frequency. The range of the modulation depth covers the regimes of
small and large-signal modulation. We show that both RIN and IMD3 of two-modulated laser are
minimum when the modulation frequency is 5GHz, and maximum when the modulation frequency is 24
GHz. The second-order harmonic distortion, IMD2, and IMD3 values are larger in the vicinity of
relaxation oscillations and increase with the modulation index, especially under large-signal modulation. |
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ISSN |
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1541-308X |
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Journal Name |
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PHYSICS OF WAVE PHENOMENA |
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Volume |
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24 |
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Issue Number |
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1 |
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Publishing Year |
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1437 AH
2016 AD |
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Article Type |
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Article |
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Added Date |
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Monday, August 14, 2017 |
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Researchers
| A Bakry | Bakry, A | Investigator | Doctorate | abakry@kau.edu.sa |
| M Ahmed | Ahmed, M | Researcher | Doctorate | |
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