| 151. |
- Larsson, Anders, 1957, et al.
(författare)
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1060 nm VCSELs for long-reach optical interconnects
- 2018
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Ingår i: Optical Fiber Technology. - : Elsevier BV. - 1095-9912 .- 1068-5200. ; 44, s. 36-42
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Tidskriftsartikel (refereegranskat)abstract
- Reach extension of high capacity optical interconnects based on vertical-cavity surface-emitting lasers (VCSELs) and multimode fibers (MMFs), as needed for large-scale data centers, would benefit from high-speed GaAs-based VCSELs at 1060 nm. At this wavelength, the chromatic dispersion and attenuation of the optical fiber are much reduced in comparison with 850 nm. We present single and multimode 1060 nm VCSELs based on designs derived partly from our high-speed 850 nm VCSEL designs. The single-mode VCSEL, with a modulation bandwidth exceeding 22 GHz, supports back-to-back data rates up to 50 Gbps at 25 °C and 40 Gbps at 85 °C under binary NRZ (OOK) modulation. Using mode-selective launch, we demonstrate error-free 25 Gbps transmission over 1000 m of 1060 nm optimized MMF. Higher data rates and/or longer distances will be possible with equalization, forward-error-correction, and/or multilevel modulation.
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| 152. |
- Larsson, Anders, 1957, et al.
(författare)
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Advances in VCSELs for Communication and Sensing
- 2010
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Ingår i: 22nd IEEE International Semiconductor Laser Conference Digest. - 0899-9406. - 9781424456826 ; , s. 4-5
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Konferensbidrag (refereegranskat)abstract
- Recent advances in VCSELs for communication and sensing are reviewed, emphasizing the development of high speed VCSELs for datacom systems and high power single-mode VCSELs for sensing applications requiring high spectral purity and coherence.
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| 153. |
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| 154. |
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| 155. |
- Larsson, Anders, 1957, et al.
(författare)
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Empowering silicon with vertical-cavity lasers
- 2017
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Ingår i: Compound Semiconductor. - 1096-598X. ; 23:5, s. 40-45
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Bringing the advantages of the VCSEL to silicon photonics with vertical-cavity lasers.
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| 156. |
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| 157. |
- Larsson, Anders, 1957, et al.
(författare)
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High speed low current density 850 nm VCSELs
- 2010
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 9780819480118 ; 7615, s. 761505-1-11-
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Konferensbidrag (refereegranskat)abstract
- The design of an oxide confined 850 nm VCSEL has been engineered for high speed operation at low current density. Strained InGaAs/AlGaAs QWs, with a careful choice of In and Al concentrations based on rigorous band structure and gain calculations, were used to increase differential gain and reduce threshold carrier density. Various measures, including multiple oxide layers and a binary compound in the lower distributed Bragg reflector, were implemented for reducing capacitance and thermal impedance. Modulation bandwidths > 20 GHz at 25°C and > 15 GHz at 85°C were obtained. At room temperature, the bandwidth was found to be limited primarily by the still relatively large oxide capacitance, while at 85°C the bandwidth was also limited by the thermal saturation of the resonance frequency. Transmission up to 32 Gb/s (on-off keying) over multimode fiber was successfully demonstrated with the VCSEL biased at a current density of only 11 kA/cm2. In addition, using a more spectrally efficient modulation format (16 QAM sub-carrier multiplexing), transmission at 40 Gb/s over 200 m multimode fiber was demonstrated.
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| 158. |
- Larsson, Anders, 1957, et al.
(författare)
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High-speed tunable and fixed-wavelength VCSELs for short-reach optical links and interconnects
- 2012
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 9780819489197 ; 8276, s. Article Number: 82760H-
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Konferensbidrag (refereegranskat)abstract
- This paper presents a review of recent work on high speed tunable and fixed wavelength vertical cavity surface emitting lasers (VCSELs) at Chalmers University of Technology. All VCSELs are GaAs-based, employ an oxide aperture for current and/or optical confinement, and emit around 850 nm. With proper active region and cavity designs, and techniques for reducing capacitance and thermal impedance, our fixed wavelength VCSELs have reached a modulation bandwidth of 23 GHz, which has enabled error-free 40 Gbps back-to-back transmission and 35 Gbps transmission over 100 m of multimode fiber. A MEMS-technology for wafer scale integration of tunable high speed VCSELs has also been developed. A tuning range of 24 nm and a modulation bandwidth of 6 GHz have been achieved, enabling error-free back-to-back transmission at 5 Gbps.
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| 159. |
- Larsson, Anders, 1957, et al.
(författare)
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High Speed VCSELs and VCSEL Arrays for Single and Multicore Fiber Interconnects
- 2015
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. - 9781628414714 ; 9381, s. Art. no. 93810D-
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Konferensbidrag (refereegranskat)abstract
- Our recent work on high speed 850 nm VCSELs and VCSEL arrays is reviewed. With a modulation bandwidth approaching 30 GHz, our VCSELs have enabled transmitters and links operating at data rates in excess of 70 Gbps (at IBM) and transmission over onboard polymer waveguides at 40 Gbps ( at University of Cambridge). VCSELs with an integrated mode filter for single mode emission have enabled transmission at 25 Gbps over > 1 km of multimode fiber and a speed-distance product of 40 Gbps . km. Dense VCSEL arrays for multicore fiber interconnects have demonstrated 240 Gbps aggregate capacity with excellent uniformity and low crosstalk between the 40 Gbps channels.
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| 160. |
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