| 1. |
- Gustavsson, Johan, 1974-, et al.
(författare)
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High-speed 850-nm VCSELs for 40 Gb/s transmission
- 2010
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering ; Semiconductor Lasers and Laser Dynamics IV; Brussels; 12 April 2010 through 16 April 2010. - 0277786X. - 978-081948193-1 ; 7720
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Konferensbidrag (övrigt vetenskapligt)
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| 2. |
- Larsson, Anders, 1957-, et al.
(författare)
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High speed VCSELs for optical interconnects
- 2012
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Ingår i: Proc. 24th International Conference on Indium Phosphide and Related Materials. - 1092-8669. - 978-146731725-2
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Konferensbidrag (refereegranskat)abstract
- This paper presents an overview of our recent work on high speed, oxide confined, 850 nm vertical cavity surface emitting lasers (VCSELs). With proper active region and cavity designs, and techniques for reducing capacitance and thermal impedance, we have reached a modulation bandwidth of 23 GHz and demonstrated 40 Gbps transmission. Using an integrated mode filter for reducing the spectral width we have extended the reach on multimode fiber at 25 Gbps from 100 to 500 m. Improved link capacity was also demonstrated using a more spectrally efficient multi-level modulation format (4-PAM). Finally, a MEMS-technology for wafer scale integration of tunable high speed VCSELs was developed, enabling a tuning range of 24 nm, a 6 GHz modulation bandwidth, and 5 Gbps transmission.
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| 3. |
- Szczerba, Krzysztof, 1985-, et al.
(författare)
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30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL
- 2011
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Ingår i: Optics Express. - 1094-4087. ; 19:26, s. 203-208
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Tidskriftsartikel (refereegranskat)abstract
- We present high speed real time, error free 4-PAMtransmission for short range optical links based on a VCSEL operating at 850 nm, a multimode fibre and a simple intensity detector. Transmission speeds of 25 Gbps and 30 Gbps are demonstrated, and the maximum fibre reaches were 300 m and 200 m, respectively. The 4-PAM is also compared with OOK transmission at 25 Gbps, and we find that at this bit rate 4-PAM increases the error free transmission distance in the multimode fibre by 100 m, compared to OOK.
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| 4. |
- Szczerba, Krzysztof, 1985-, et al.
(författare)
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30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL
- 2011
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Ingår i: 2011 37th European Conference on Optical Communication (ECOC); 18-22 Sept. 2011; Geneva. - 978-1-4577-1918-9 ; s. 1-3
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Konferensbidrag (refereegranskat)abstract
- Real time, error free 4-PAM transmission at 25 Gbps and 30 Gbps over 300 m and 200m of multimode fiber, respectively, using a VCSEL operating at the wavelength of 850 nm.
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| 5. |
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| 6. |
- Szczerba, Krzysztof, 1985-, et al.
(författare)
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4-PAM for high-speed short-range optical communications
- 2012
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Ingår i: Journal of Lightwave Technology. - 0733-8724.
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Tidskriftsartikel (refereegranskat)abstract
- In this work we compare 4-PAM and OOK modulation formats at high speed for short range optical communication systems. The transmission system comprises a directly modulated VCSEL operating at wavelength of 850 nm, an OM3+ multimode fibre link and a photodetector detecting the intensity at the receiver end. The modulation formats are compared both at the same bit rate and at the same symbol rate. The maximum bit rate used was 25 Gbps. Propagation distances up to 600 m were investigated at 12.5 Gbps. All measurements were done in real time and without any equalization.
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| 7. |
- Szczerba, Krzysztof, 1985-, et al.
(författare)
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4-PAM for high-speed short-range optical communications
- 2012
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Ingår i: Journal of Optical Communications and Networking. - 1943-0620. ; 4:11, s. 885-894
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Tidskriftsartikel (refereegranskat)abstract
- In this work, we compare 4-pulse amplitude modulation and on–off keying modulation formats at high speed for short-range optical communication systems. The transmission system comprised a directly modulated verticalcavity surface-emitting laser operating at a wavelength of 850 nm, an OM3Å multimode fiber link, and a photodetector detecting the intensity at the receiver end. The modulation formats were compared both at the same bit-rate and at the same symbol rate. The maximum bit-rate used was 25 Gbps. Propagation distances up to 600 m were investigated at 12.5 Gbps. All measurements were done in real time and without any equalization.
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| 8. |
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| 9. |
- Szczerba, Krzysztof, 1985-, et al.
(författare)
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Experimental comparison of modulation formats in IM/DD links
- 2011
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Ingår i: Optics Express. - 1094-4087. ; 19:10, s. 9881-9889
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Tidskriftsartikel (refereegranskat)abstract
- We present an experimental comparison of modulation formats for optical intensity modulated links with direct detection. Specifically, we compare OOK, QPSK on an electrical subcarrier and a new modulation format named OOPSK. The OOPSK modulation format is shown to have better sensitivity than the other modulation formats, in agreement with theoretical predictions. The impact of propagation in multimode fiber is also studied and the results show that all modulation formats have similar sensitivity penalties, with respect to the fibre length.
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