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- Wang, Shu Min, 1963, et al.
(author)
-
High Performance 1.3 μm GaInNAs Quantum Well Lasers on GaAs
- 2008
-
In: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 9780819470843 ; 6909, s. 690905-
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Conference paper (peer-reviewed)abstract
- We present state-of-the-art performance of 1.3 μm GaInNAs lasers on GaAs grown by molecular beam epitaxy. The lowest achieved threshold current density is 297, 150 and 133 A/cm 2 per quantum well (QW) for single, double and triple QW broad area lasers with a cavity length of 1 mm. The characteristic temperature is 93-133 K in the ambient temperature range of 10-80 °C for broad area lasers depending on the cavity length, and increases to 163-208 K for ridge waveguide lasers as a result of temperature insensitive lateral carrier diffusion in QWs. The maximum 3 dB bandwidth of 17 GHz is achieved in a double QW laser. Uncooled 10 Gb/s operation up to 110 °C has been demonstrated.
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| 42. |
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| 43. |
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| 44. |
- Wei, Yongqiang, 1975, et al.
(author)
-
Dynamics and temperature-dependence of 1.3-μm GaInNAs double quantum-well lasers
- 2006
-
In: IEEE Journal of Quantum Electronics. - 0018-9197 .- 1558-1713. ; 42:12, s. 1274-1280
-
Journal article (peer-reviewed)abstract
- We have measured the small-signal modulation response of 1.3-μm ridge waveguide GaInNAs double quantum-well lasers over a wide range of temperatures (25 μC-110 °C) and analyzed the temperature dependence of the modulation bandwidth and the various bandwidth limiting effects. The lasers have low threshold currents and high differential efficiencies with small temperature dependencies. A short-cavity (350 μm) laser has a modulation bandwidth as high as 17 GHz at room temperature, reducing to 4 GHz at 110 °C, while a laser with a longer cavity (580 μm) maintains a bandwidth of 8.6 GHz at 110 μC. We find that at all ambient temperatures the maximum bandwidth is limited by thermal effects as the temperature increases with current due to self-heating. The reduction and subsequent saturation of the resonance frequency with increasing current is due to a reduction of the differential gain and an increase of the threshold current with increasing temperature. We find large values for the differential gain and the gain compression factor. The differential gain decreases linearly with temperature while there is only a weak temperature dependence of the gain compression. At the highest temperature we also find evidence for transport effects that increase the damping rate and reduce the intrinsic bandwidth.
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| 45. |
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| 46. |
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| 47. |
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| 48. |
- Westbergh, Petter, 1981, et al.
(author)
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32 Gb/s transmission experiments using high speed 850 nm VCSELs
- 2009
-
In: Conference on Lasers and Electro-Optics (CLEO). - 2162-2701. - 9781557528698 ; , s. 1-2
-
Conference paper (peer-reviewed)abstract
- We demonstrate error free transmission at bit rates up to 32 Gb/s at room temperature and 25 Gb/s at 85degC using a 9 mum oxide aperture 850 nm VCSEL. The VCSEL design is optimized for high speed operation by minimizing parasitics, reducing self-heating, and using strained InGaAs quantum wells to improve differential gain.
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| 49. |
- Westbergh, Petter, 1981, et al.
(author)
-
32 Gbit/s multimode fibre transmission using high-speed, low current density 850 nm VCSEL
- 2009
-
In: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 45:7, s. 366 - 368
-
Journal article (peer-reviewed)abstract
- Error free transmission over multimode fibre at data rates up to 32 Gbit/s at 25C and 25 Gbit/s at 85C using an oxide confined 850 nm VCSEL biased at a current density of 11–14 kA/cm2 is demonstrated. The VCSEL is optimised for high-speed by reducing capacitance and self-heating and by using strained InGaAs quantum wells for high differential gain.
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| 50. |
- Westbergh, Petter, 1981, et al.
(author)
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A high-speed laser for future data-communication links
- 2009
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In: SPIE Newsroom. - : SPIE-Intl Soc Optical Eng. - 1818-2259.
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Journal article (other academic/artistic)abstract
- Optimized designs significantly improve the transmission rate of standard short-wavelength light sources.
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