Theory of the linewidth of semiconductor lasers
Abstract
A theory of the spectral width of a single-mode semiconductor laser is presented and used to explain the recent measurements of Fleming and Mooradian on AlGaAs lasers. They found the linewidth to be inversely proportional to power and to have a value of 114 MHz at 1 mW per facet. This value is 30 times greater than can be explained by existing theories. The enhanced linewidth is attributed to the variation of the real refractive indexn'with carrier density. Spontaneous emission induces phase and intensity changes in the laser field. The restoration of the laser to its steady-state intensity results in changes in the imaginary part of the refractive index\Delta n". These changes are accompanied by changes in the real part of the refractive index\Delta n', which cause additional phase fluctuations and line broadening. The linewidth enhancement is shown to be1 + \alpha^{2}, where\alpha = \Delta n'/\Delta n". A value of\alpha \approx 5.4, needed to explain the observed linewidth, is close to the experimental values of a of 4.6 and 6.2.
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To overcome the bandwidth limitation of shot noise-limited homodyne detection, researchers have developed QRNGs based on measuring phase or intensity noise of amplified spontaneous emission (ASE), which is quantum mechanical by nature.
“To overcome the bandwidth limitation of shot noise-limited homodyne detection, researchers have developed QRNGs based on measuring phase 40 -45 or intensity noise 46,47 of ampli fi ed spontaneous emission(ASE), which is quantum mechanical by nature. 15,48,49”
From Quantum random number generation (2016) · cites this paper as [48]
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- Authors
- Henry, C.
- Affiliations
- AT&T (United States) (US)
- Corresponding author
- Henry, C.
- ORCID
- Henry, C.
- Venue
- IEEE Journal of Quantum Electronics
- Published
- 1982-02
- Volume
- 18
- Issue
- 2
- Pages
- 259-264
- ISSN
- 0018-9197 (ISSN-L)
- OpenAlex
- W2089997550
- Cited by
- 2,488
- References
- 15
- Citations by year
- 2026: 58 · 2025: 72 · 2024: 83 · 2023: 85 · 2022: 67 · 2021: 85 · 2020: 84 · 2019: 73 · 2018: 61 · 2017: 87 · 2016: 68 · 2015: 76 · 2014: 63 · 2013: 56 · 2012: 69
- FWCI
- 68.71
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- IEEE Journal of Quantum Electronics (publishedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Semiconductor Lasers and Optical Devices
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Semiconductor Quantum Structures and Devices
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Photonic and Optical Devices
- Keywords
- single-mode laser, GaAlAs laser, linewidth enhancement, refractive index change, carrier density dependence, spontaneous emission, phase fluctuations, intensity fluctuations, linewidth enhancement factor
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