| 1. |
- Persson, K. A., et al.
(författare)
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WCDMA radio-over-fibre transmission experiment using singlemode VCSEL and multimode fibre
- 2006
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 42:6, s. 372-374
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Tidskriftsartikel (refereegranskat)abstract
- A high-performance singlemode VCSEL developed for analogue applications has been evaluated for use in a radio-over-fibre link for WCDMA in-building distributed antenna systems. The experiment showed penalty-free transmission over a wide range of input RF powers. The ACLR limited the downlink input RF power to less than -13dBm.
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| 2. |
- Stampoulidis, Leontios, et al.
(författare)
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High-speed low-power and board-mountable optical transceivers for scalable & energy efficient advanced on-board digital processors
- 2018
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. ; 11180
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Konferensbidrag (refereegranskat)abstract
- We present the development and verification testing of a high speed multimode, multicore transceiver technology for intra-satellite optical interconnects. We report the fabrication and functional testing of opto-parts including 25 Gb/s 850 nm VCSEL/PD as well as the verification testing of the VCSELs against radiation and lifetime performance. In addition we report the development and evaluation testing of a multi-core cable assembly that was fabricated and mated with MiniAVIM multi-core connectors to develop hi-rel multi-core optical patchcords for pigtailing the transceiver modules. The fiber optic, electronic and opto-parts were used to assemble the first ever fully packaged and pigtailed, six-core optical transceiver prototype module that operates at 25 Gb/s channel bit rate at an energy consumption of ∠4.5 mW/Gb/s.
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| 3. |
- Wei, Yongqiang, 1975, et al.
(författare)
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Dynamics and temperature-dependence of 1.3-μm GaInNAs double quantum-well lasers
- 2006
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Ingår i: IEEE Journal of Quantum Electronics. - 0018-9197 .- 1558-1713. ; 42:12, s. 1274-1280
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Tidskriftsartikel (refereegranskat)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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| 4. |
- Zenari, M., et al.
(författare)
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Impact of the oxide aperture width on the degradation of 845 nm VCSELs for silicon photonics
- 2024
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - 1558-4542 .- 1077-260X. ; In Press
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Tidskriftsartikel (refereegranskat)abstract
- For the first time, we analyzed the degradation as a function of the oxide aperture in 845 nm VCSELs designed for silicon photonics (SiPh) applications. First, we evaluated the optical degradation of the devices by collecting EL images during a constant current stress. The experimental results showed an increased spreading of the optical beam of the VCSEL with increasing ageing time. Based on numerical simulations, we demonstrated that the electrical degradation (increase in series resistance) is responsible a larger current spreading which, in turn, increases the FWHM (full width half maximum) of the optical beam. We further evaluated the series resistance variation by aging four lasers with different oxide apertures. The results of this set of experiments showed that the electrical degradation is stronger as the oxide aperture is smaller, and mostly depends on the contribution of the top DBR resistance. Thanks to our analysis we proved that the use of a larger aperture can result in a better device reliability.
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