The coherent fiber optic transmission systems deployed in recent years provide increasingly high per-channel capacities (40 Gb/s and beyond). These systems based on polarization multiplexing of the optical signal must be more robust to polarization effects in order to avoid performance degradations which could lead to failures in extreme cases.
In this thesis, an analysis of the performance and polarization dynamics observed in two coherent optical links is presented. These measurements were obtained by monitoring a regional aerial link over a period of 22 months and a buried link in a metropolitan area over 6 months using coherent transponders and fast polarimeters. Different analyzes were made using data processing tools developed under Matlab.
In the first part of the thesis, an analysis of polarization events exceeding 1.27 rad/ms observed in a 1020-km aerial link at 40 Gb/s is presented. The measurements were carried out with a polarimeter at an acquisition frequency of 20 kHz. An analysis of the rapid polarization changes in a 240-km buried link at 100 Gb/s deployed in a metropolitan area is also presented. The measurements were obtained using a polarimeter operating at 24 kHz and 390 kHz.
In the second part, a comparative analysis of the polarization effects (SOP, PMD, PDL) observed in the two optical links studied is performed and the results are compared with similar measurements previously performed in a buried optical link of 230 km.
In the third part, a study of the polarization tracking error by the coherent receiver shows the relationship between the tracking filter bandwidth of the coherent receiver and the polarization tracking error.
| Date | 29 Jun 2017 |
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| Original language | French |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Christine Tremblay (Supervisor) |
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Tanoh, N. B. M. J. (Author),
Tremblay (Supervisor),
29 Jun 2017Student thesis: Master's thesis › Master in Engineering: Engineering