Multi slot amplitude coding technique for high speed optical fiber communication system
The rapid progress of the high speed optical communications system is driven by the exponential growth of users demand on information and services. The trend towards high speed and high capacity transmission system are multiplexing technique such as electrical time division multiplexing (ETDM) and d...
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| Format: | Thesis |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7834/ http://eprints.uthm.edu.my/7834/1/Radzi_Bin_Ambar.pdf |
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| Summary: | The rapid progress of the high speed optical communications system is driven by the
exponential growth of users demand on information and services. The trend towards
high speed and high capacity transmission system are multiplexing technique such as
electrical time division multiplexing (ETDM) and duty cycle division multiplexing
(DCDM). Unfortunately, ETDM bit rate is limited by the speed of electronic devices
and DCDM suffers from increased spectral width when the number of tributary
increased. Therefore, in this research, a new multiplexing technique is proposed,
known as Multi Slot Amplitude Coding (MSAC). In this technique, three, four and
five tributaries can be achieved with less number of slots compared to DCDM. The
performance of 310 Gbit/s MSAC is -26 dBm for receiver sensitivity (RS) and
25.5 dB for optical signal-to-noise ratio (OSNR). The improvement of 3.5 dB for RS
and 3.7 dB for OSNR are obtained when optimize level spacing is implemented.
When compared to DCDM, the spectral width is reduced by around 25%, not less
than 55% improvement of chromatic dispersion (CD) tolerance, 0.6 dB better RS,
and 1.5 dB better OSNR. The spectral width for 310 Gbit/s, 410 Gbit/s and 510
Gbit/s MSAC is 60 GHz, which indicates improvement of spectral efficiency.
Optical spectrum of MSAC has spectral line at 10 GHz to provide an accurate clock
frequency at symbol rate. In addition the performance of MSAC technique is
simulated under self phase modulation (SPM) effect. The result shows that the
maximum launched optical power is +12.79 dBm and +12.62 dBm for 50 km and 80
km standard single mode fiber (SSMF) with 100% compensation of dispersion using
dispersion compensation fiber (DCF) at receiver. Moreover, SPM threshold improves
around 2.7 dB when adopting the pre and post dispersion compensation method. |
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