| 1. |
- Bakhshi, Bamdad, 1970, et al.
(författare)
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Experimental observation of soliton robustness to polarisation dispersion pulse broadening
- 1999
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Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 35:1, s. 65-66
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Tidskriftsartikel (refereegranskat)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.
(författare)
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Measurement of the differential group delay in installed optical fibers using polarization multiplexed solitons
- 1999
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Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 11:5, s. 593-595
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Tidskriftsartikel (refereegranskat)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. |
- Brentel, Jonas, et al.
(författare)
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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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Ingår i: 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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Konferensbidrag (refereegranskat)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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| 4. |
- Kolltveit, Erling, et al.
(författare)
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Single-wavelength 40 Gbit/s soliton field transmission experiment over 400 km of installed fibre
- 1999
-
Ingår i: Electronics Letters. - : Institution of Engineering and Technology (IET). - 1350-911X .- 0013-5194. ; 35:1, s. 75-76
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Tidskriftsartikel (refereegranskat)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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| 5. |
- Olsson, Bengt-Erik, 1968
(författare)
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All-Optical Switching with the Nonlinear Optical Loop Mirror
- 1998
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis deals with the theory and applications of the nonlinear optical loop mirror (NOLM). Novel methods to restore and filter optical data as well as generate high peak power optical pulses using the NOLM are demonstrated. Further more, new approaches for polarization indep endent demultiplexing and a fully polarization independent all-optical AND-gate are proposed and experimentally demonstrated. The NOLM has been widely employed as an ultrafast demultiplexing device with the potential of demultiplexing data at speeds beyond 1 Tbit/s. The nonlinear characteristics of the NOLM can also be utilized for other all-optical applications such as filtering and logic operations. The nonlinear transmission characteristic is used to substantially improve the extinction ratio of an optical data sequence and remove low intensity noise over a wide spectral range. The proposed filtering technique is also successfully employed in a chain of optical amplifiers to generate pulses with very high peak power. Several new schemes for performing polarization independent all optical switching using standard dispersion shifted fibers are also proposed and demonstrated. One scheme utilizes a birefringent element in a control power balanced propagation diversity NOLM. This control power balanced NOLM is shown not to suffer from control power induced crosstalk as the conventional NOLM does. Another scheme employs a dispersion shifted fiber with random birefringence and has the advantage of being polarization independent of both data and control signal, thus constituting a polarization independent AND-gate. Finally a scheme utilizing the optical Kerr effect in a polarization diversity loop is demonstrated. This scheme is not an interferometer which results in better stability than other NOLMs. In addition, a solution to make the NOLM insensitive to acoustical disturbances by rewinding the loop fiber is demonstrated.
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| 6. |
- Olsson, Bengt-Erik, 1968, et al.
(författare)
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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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Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 10:7, s. 997-999
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Tidskriftsartikel (refereegranskat)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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