11. |
- Lengyel, Tamas, 1986, et al.
(författare)
-
Sensitivity improvements in an 850 nm VCSEL transmitter using a one-tap pre-emphasis electronic filter
- 2015
-
Ingår i: 41st European Conference on Optical Communication, ECOC 2015, Valencia, Spain, 27 September - 1 October 2015. - 9788460817413 ; 2015-November
-
Konferensbidrag (refereegranskat)abstract
- We present ISI reduction of an 850 nm VCSEL-based back-to-back optical link using a one-tap electronic pre-emphasis filter and compare it to a VCSEL link without filtering with similar launch conditions. Error floors are eliminated by the use of the filter.
|
|
12. |
- Safaisini, Rashid, 1981, et al.
(författare)
-
High-Speed 850 nm Quasi-Single Mode VCSELs for Extended Reach Optical Interconnects
- 2013
-
Ingår i: Journal of Optical Communications and Networking. - 1943-0620 .- 1943-0639. ; 5:7, s. 686-695
-
Tidskriftsartikel (refereegranskat)abstract
- This paper presents recent results on high-speed, quasi-single-mode, 850 nm vertical-cavity surface-emitting lasers (VCSELs) with a narrow spectral width for extended-reach optical interconnects. The top mirror reflectivity is adjusted for high output power, slope efficiency, and small signal modulation bandwidth. An oxide confined VCSEL with an ∼3 μm aperture diameter delivers 2 mW of output power and reaches a resonance frequency as high as 25 GHz and a modulation bandwidth exceeding 20 GHz. A small K-factor of 0.17 ns and a large D-factor of 17.3 GHz/mA1/2, extracted from the VCSEL modulation response, along with the improved DC and modal properties enable energy-efficient data transmission at high bit rates over long-distance multimode fiber. Error-free transmission at bit rates exceeding 20 Gbits/s over 1.1 km of OM4 fiber is demonstrated and shown to be limited mainly by the photoreceiver bandwidth. A theoretical investigation of the dependence of link performance on photoreceiver bandwidth is also presented.
|
|
13. |
- Szczerba, Krzysztof, 1985, et al.
(författare)
-
30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL
- 2011
-
Ingår i: Optics Express. - 1094-4087 .- 1094-4087. ; 19:26, s. B203-B208
-
Tidskriftsartikel (refereegranskat)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.
|
|
14. |
- Szczerba, Krzysztof, 1985, et al.
(författare)
-
30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL
- 2011
-
Ingår i: European Conference and Exposition on Optical Communications, ECOC. - 2162-2701. - 9781557529312 ; , s. 1-3
-
Konferensbidrag (refereegranskat)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.
|
|
15. |
- Szczerba, Krzysztof, 1985, et al.
(författare)
-
35.2 Gbps 8-PAM transmission over 100 m of MMF using an 850 nm VCSEL
- 2013
-
Ingår i: Proc. European Conference on Optical Communication (ECOC). - : Institution of Engineering and Technology. - 9781849197595 ; 2013:622 CP, s. 744-746
-
Konferensbidrag (refereegranskat)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.
|
|
16. |
|
|
17. |
- Szczerba, Krzysztof, 1985, et al.
(författare)
-
4-PAM for high-speed short-range optical communications
- 2012
-
Ingår i: Journal of Optical Communications and Networking. - 1943-0620 .- 1943-0639. ; 4:11, s. 885-894
-
Tidskriftsartikel (refereegranskat)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.
|
|
18. |
- Szczerba, Krzysztof, 1985, et al.
(författare)
-
60 Gbits error-free 4-PAM operation with 850 nm VCSEL
- 2013
-
Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 49:15, s. 953-955
-
Tidskriftsartikel (refereegranskat)abstract
- 60 Gbits over 2 m, 50 Gbits over 50 m and 40 Gbits was transmitted over 100 m of OM4 multimode fibre using four-level pulse amplitude modulation and a directly modulated 850 nm vertical cavity surface emitting laser (VCSEL).
|
|
19. |
- Szczerba, Krzysztof, 1985, et al.
(författare)
-
70 Gbps 4-PAM and 56 Gbps 8-PAM Using an 850 nm VCSEL
- 2015
-
Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 33:7, s. 1395-1401
-
Tidskriftsartikel (refereegranskat)abstract
- We present 56 Gbps unequalized 8-pulse-amplitude-modulation (PAM) real-time transmission over 50 m of multimode fiber and 70 Gbps 4-PAM operation with offline equalization. FEC would be necessary in both schemes. The bit-rates are given taking into account the FEC overhead needed to reach a BER below 10-12. The experiments were performed with an 850 nm vertical cavity surface emitting laser with 20 GHz bandwidth and a 22 GHz photoreceiver. We show that 8-PAM modulation requires channel bandwidth comparable with the symbol rate to avoid excessive ISI penalty and that equalization of 4-PAM signal can significantly improve achievable bit-rates.
|
|
20. |
- Szczerba, Krzysztof, 1985, et al.
(författare)
-
70 Gbps 4-PAM and 56 Gbps 8-PAM using an 850 nm VCSEL
- 2014
-
Ingår i: 2014 European Conference on Optical Communication, ECOC 2014; Cannes; France; 21 September 2014 through 25 September 2014. - 9782954944401 ; , s. Art. no. 6963923-
-
Konferensbidrag (refereegranskat)abstract
- t We present 56 Gbps unequalized 8-PAM real-time transmission over 50 m of MMF and 70Gbps 4-PAM operation with offline equalization. The experiments were performed with an 850 nm VCSEL with 25 GHz bandwidth and a 22 GHz photoreceiver.
|
|