Realization of 4x25-Gbit/s TWDM-PON Systems by Spectrum Reshaping
| Autor: | Yuan-Yuan Sung, 宋媛媛 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 We proposed a spectrum reshaping scheme for single-channel 25Gb/s transmission over 20-50km single mode fiber (SMF) by using a 10Gb/s direct modulation laser (DML) with insufficient modulation bandwidth. We compared the effects of two reshaping filters, Fabry-Perot (FP) Etalon and Gaussian shape tunable filter. Both simulation and experiments were carried out to investigate the effectiveness of this scheme. The reshaping filter could cause three effects. The first effect is to convert the frequency modulation (FM) to amplitude modulation (AM) and get a higher Extinction Ratio (ER). The second one is to induce an extra phase shift because of the nonlinear edge slope and reduce the intersymbol interference (ISI) caused by dispersion. The last one is to increase the modulation bandwidth, similar to the function of an equalizer. We used the periodic spectral characteristic of an optical etalon to reshape four wavelength-channels simultaneously. Thus, we can realize a transmission of 100 Gb/s total capacity over 20-50km SMF that can be used in splitting ratio of 1:128 time- and wavelength- division multiplexed passive optical network (TWDM-PON) systems. Moreover, the wavelength locking mechanism can also be implemented by the using the same optical etalon in our architecture. We can detect the alteration of the transmission and reflection optical powers of the reshaping filer when the laser wavelength drifts. This mechanism can ensure the system stability without changing the MAC layer. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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