| 1. |
- Bakhshi, Bamdad, 1970, et al.
(author)
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Experimental observation of soliton robustness to polarisation dispersion pulse broadening
- 1999
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In: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 35:1, s. 65-66
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Journal article (peer-reviewed)abstract
- Soliton robustness to polarisation dispersion pulse broadening in a 400km installed optical fibre is experimentally demonstrated. With 10ps input pulses and a differential group delay of 7.6ps, the soliton pulsewidth at the receiver is maintained within 10-11ps when the input polarisation is changed, while the corresponding range for dispersion-compensated linear pulses is 10.5-15.5ps.
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| 2. |
- Bakhshi, Bamdad, 1970, et al.
(author)
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Measurement of the differential group delay in installed optical fibers using polarization multiplexed solitons
- 1999
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In: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 11:5, s. 593-595
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Journal article (peer-reviewed)abstract
- We experimentally demonstrate a new technique for measurement of the differential group delay (DGD) in optical fibers using polarization-division multiplexed (PDM) solitons: the change in the separation of orthogonally polarized solitons propagating along different principal axes in a fiber equals the DGD at the signal wavelength. Based on this principle, we use PDM solitons to measure the accumulated DGD at different distances along a 400-km installed fiber. The measured DGD exhibits the expected square-root-of-length dependence, corresponding to a polarization-mode dispersion of 0.26 ps/km1/2. The results are in excellent agreement with those obtained by a commercial instrument utilizing Jones matrix eigenanalysis.
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| 3. |
- Bakhshi, Bamdad, 1970, et al.
(author)
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Soliton interaction penalty reduction by receiver filtering
- 1998
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In: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 10:7, s. 1042-1044
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Journal article (peer-reviewed)abstract
- We present the first detailed numerical study of the impact of receiver low-pass filtering in soliton interaction-limited communication systems. We propagate 40-Gb/s pseudorandom bit sequences (PRBS's) of 28-1 solitons up to one soliton collision distance (Zc-) and optimize the filter bandwidth to minimize the interaction induced eye opening penalty. The distance at 0.5-dB penalty is increased over 40% through filtering. The penalty is essentially pulsewidth independent when considering distances normalized by Zc. We also show that PRBS's of at least 28 - 1 solitons are required to accurately simulate random data.
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| 4. |
- Brentel, Jonas, et al.
(author)
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Single-wavelength 40 Gb/s soliton field transmission experiments over 400 km fibre without in-line control
- 1999
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In: OFC/IOOC 1999 - Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication. - 155752582X ; 3, s. 121-124
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Conference paper (peer-reviewed)abstract
- We report single-wavelength 40-Gbit/s soliton transmission over 400-km installed fiber lines in Sweden. Both polarization-division multiplexed and parallel solitons were transmitted. The system performance is dominated by the polarization-mode dispersion.
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| 5. |
- Hedekvist, Per Olof E, 1967, et al.
(author)
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Fiber four-wave mixing demultiplexing with inherent parametric amplification
- 1997
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In: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 15:11, s. 2051-2058
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Journal article (peer-reviewed)abstract
- We present an all-optical time-division demultiplexer with 22 dB conversion efficiency, using four-wave mixing (FWM) at 1550 nm in a single-mode dispersion-shifted fiber. Error-free demultiplexing of 20 Gb/s data to 10 Gb/s is obtained, with 1.4 dB power penalty at BER = 10-9. We also derive theoretical expressions for the conversion efficiency, the maximum bit rate that is possible to demux and the shape of the switching window. In particular we emphasize the importance of phase-matching in order to achieve a flat switching window. Furthermore the pump must remain undepleted to avoid a detrimental reduction of the extinction ratio due to instantaneous parametric gain saturation.
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| 6. |
- Hedekvist, Per Olof E, 1967, et al.
(author)
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Polarization dependence and efficiency in a fiber four-wave mixing phase conjugator with orthogonal pump waves
- 1996
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In: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 8:6, s. 776-778
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Journal article (peer-reviewed)abstract
- We study the influence of pump separation on polarization dependence and on conversion efficiency in a fiberbased optical phase-conjugator with two orthogonal pump waves at different wavelengths. The polarization dependence is found to be minimized when the pump wavelength separation is small. Furthermore, both theory and experiments show that the efficiency is maximized if the signal wavelength is located close to one of the pumps.
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| 7. |
- Karlsson, Magnus, 1967, et al.
(author)
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High-speed OTDM and impact of PMD
- 1999
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In: 1999 IEEE LEOS Annual Meeting Conference Proceedings. LEOS'99. 12th Annual Meeting. IEEE Lasers and Electro-Optics Society 1999 Annual Meeting. - 0780356349
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Conference paper (peer-reviewed)abstract
- We discuss the impact of polarization mode dispersion (PMD) in high-speed fiber transmission. Special emphasis is put on PMD compensation techniques, and their intrinsic limitations. We also propose a new and simple distributed compensation scheme.
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| 8. |
- Karlsson, Magnus, 1967, et al.
(author)
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Soliton Stability in PMD Perturbed Transmission Systems
- 1998
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In: New Trends in Optical Soliton Transmission Systems. - Dordrecht : Springer Netherlands. - 9789401151412 ; , s. 25-37
-
Book chapter (other academic/artistic)abstract
- This paper presents a detailed investigation of how solitons broaden in the presence of polarization-mode dispersion (PMD). For a given degree of PMD and pulse width there exists an optimum choice of group-velocity dispersion, for which solitons are most resistant to the effects of PMD. We also optimize the soliton power enhancement factor and find that solitons can propagate roughly twice the distance compared to linear pulses in the absence of group-velocity dispersion. Finally we investigate the PMD robustness of dispersion managed solitons, and in the case simulated we find no quantitative difference as compared to conventional solitons.
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| 9. |
- Kolltveit, Erling, et al.
(author)
-
Single-wavelength 40 Gbit/s soliton field transmission experiment over 400 km of installed fibre
- 1999
-
In: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 35:1, s. 75-76
-
Journal article (peer-reviewed)abstract
- 40Gbit/s soliton transmission over 400km (57km amplifier spacing) of installed lines without in-line control has been achieved. The maximum transmission penalties for parallel polarised and polarisation division multiplexed soliton transmission were ∼4 and 1dB, respectively. The transmission distance is the longest ever reported for a field trial with a single wavelength bit rate > 20Gbit/s for any optical transmission format. The polarisation mode dispersion was numerically found to completely dominate the system performance.
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| 10. |
- Olsson, Bengt-Erik, 1968, et al.
(author)
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Polarization mode dispersion measurement using a Sagnac interferometer and a comparison with the fixed analyzer method
- 1998
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In: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 10:7, s. 997-999
-
Journal article (peer-reviewed)abstract
- Polarization mode dispersion measurement using a Sagnac interferometer is compared with the well-known fixed analyzer technique both theoretically and experimentally. It is shown that in the case of weak mode coupling in the fiber the Sagnac interferometer method is equivalent to the fixed analyzer method but gives better readability of the measured optical spectrum. For strong mode coupling, we develop a theory that relates the differential group delay to the number of mean-level crossings in the measured spectrum.
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