| 1. |
- Szczerba, Krzysztof, 1985, et al.
(author)
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30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL
- 2011
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In: Optics Express. - 1094-4087 .- 1094-4087. ; 19:26, s. B203-B208
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Journal article (peer-reviewed)abstract
- We present high speed real time, error free 4-PAMtransmissionfor 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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| 2. |
- Szczerba, Krzysztof, 1985, et al.
(author)
-
30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL
- 2011
-
In: European Conference and Exposition on Optical Communications, ECOC. - 2162-2701. - 9781557529312 ; , s. 1-3
-
Conference paper (peer-reviewed)abstract
- Real time, error free 4-PAM transmission at 25 Gbps and 30 Gbps over 300 m and200m of multimode fiber, respectively, using a VCSEL operating at the wavelength of 850 nm.
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| 3. |
- Szczerba, Krzysztof, 1985, et al.
(author)
-
35.2 Gbps 8-PAM transmission over 100 m of MMF using an 850 nm VCSEL
- 2013
-
In: Proc. European Conference on Optical Communication (ECOC). - : Institution of Engineering and Technology. - 9781849197595 ; :622 CP, s. 744-746
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Conference paper (peer-reviewed)abstract
- We report experimental demonstration of 8-PAM transmission using an 850 nm VCSEL and 100 m of OM4-type MMF. The 8-level driving signal was generated using a 3-bit DAC, the error rates were measured in real time using a conventional error analyzer. Maximum uncoded bit rate was 37.5 Gbps, which corresponds to 35.2 Gbps with 7% FEC overhead.
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| 4. |
- Szczerba, Krzysztof, 1985, et al.
(author)
-
4-PAM for high-speed short-range optical communications
- 2012
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In: Journal of Optical Communications and Networking. - 1943-0620 .- 1943-0639. ; 4:11, s. 885-894
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Journal article (peer-reviewed)abstract
- In this work, we compare 4-pulse amplitudemodulation and on–off keying modulation formats at highspeed for short-range optical communication systems. Thetransmission system comprised a directly modulated verticalcavitysurface-emitting laser operating at a wavelength of850 nm, an OM3Å multimode fiber link, and a photodetectordetecting the intensity at the receiver end. The modulationformats were compared both at the same bit-rate and at thesame symbol rate. The maximum bit-rate used was 25 Gbps.Propagation distances up to 600 m were investigated at12.5 Gbps. All measurements were done in real time andwithout any equalization.
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| 5. |
- Szczerba, Krzysztof, 1985, et al.
(author)
-
Comparison of Intersymbol Interference Power Penalties for OOK and 4-PAM in Short-Range Optical Links
- 2013
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In: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 31:22, s. 3525-3534
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Journal article (peer-reviewed)abstract
- We present results of experimental and theoretical investigations of intersymbol interference in 4-PAM transmission in short-range optical communications links based on the power penalty. A test link comprised of a directly modulated 850 nm VCSEL with up to 200 m of multimode fiber and direct detection was used. The link bandwidth was below 10 GHz and the maximum achieved data rate with 4-PAM was 44 Gbps over 100 m of fiber. In the same case and at similar sensitivity, only 32 Gbps could be achieved with OOK. If typical forward error correction could be applied, the sensitivity of the 4-PAM system was improved by up to 4 dB, reaching -10 dBm at 25 Gbps.
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| 6. |
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| 7. |
- Szczerba, Krzysztof, 1985, et al.
(author)
-
Experimental comparison of modulation formats in IM/DD links
- 2011
-
In: Optics Express. - 1094-4087 .- 1094-4087. ; 19:10, s. 9881-9889
-
Journal article (peer-reviewed)abstract
- We present an experimental comparison of modulation formatsfor optical intensity modulated links with direct detection. Specifically, wecompare OOK, QPSK on an electrical subcarrier and a new modulationformat named OOPSK. The OOPSK modulation format is shown to havebetter sensitivity than the other modulation formats, in agreement withtheoretical predictions. The impact of propagation in multimode fiber isalso studied and the results show that all modulation formats have similarsensitivity penalties, with respect to the fibre length.
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