The coherent system has been extensively studied in recent years. The reasons
are that receiver sensitivity is better than Intensity Modulation with Direct
Detection (IM/DD) and the spectral efficiency of wavelength division
multiplexing (WDM) is increased. The modulation formats of the coherent system
are Amplitude shift keying (ASK), Phase shift keying (PSK), and Frequency shift
keying (FSK). The detection techniques are Homodyne detection and Heterodyne
detection, both of them need a laser light source in the receiver called as the Local
oscillator (LO).
In the previous study, the Quadrature phase shift keying (QPSK) modulation
format with Pseudo Random Binary Sequence (PRBS) 27-1 to transmit 51km was
investigated, and the pilot carrier method realized the Homodyne Detection. The
merit of the pilot carrier is that the LO is not necessary in the receiver. In this
master thesis, the optical signal of the QPSK modulation format with PRBS 215-1
is transmitted over 500km using the pilot carrier method. A WDM system
demonstration is also conducted to increase the system capacity. The Bit error rate
(BER) is calculated by the MATLAB program.
The BER performance of 20G bit/s, 500 km transmission system using the
QPSK with single channel and multiplexed channels were measured.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0711111-161427 |
| Date | 11 July 2011 |
| Creators | Chen, Shr-Jie |
| Contributors | Cheng-Mu Tsai, Chin-ping Yu, Hidenori Taga, Hung-Wen Chang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0711111-161427 |
| Rights | campus_withheld, Copyright information available at source archive |
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