Abstract
In this thesis, we use a high power 1550 nm DFB laser and
a Ti:LiNbO3 Mach-Zehnder modulator to construct an externally
modulated trensmitter for CATV lightwave system. We use two
methods to reduce the problem caused by stimulated Brillouin
scattering (SBS) effect in externally modulated AM video system
by using high-frequency phase modulation and low-frequency
dithering techniques. In this experiment, the SBS threshold can
be increased by 6 dB. We also design a automatic gain control
(AGC) circuit with a 10 dB dynamic range in our transmitter.
After addition with a home-made predistortion linearized circuit,
the system performance of this transmitter in a 20 km single-mode
fiber link carrying 60 NTSC channels can be achieved with a
CNR¡Ù46~52 dB¡BCSO¡Ø-68~-73 dBc¡BCTB¡Ø-59~-63 dBc. As the number of
channels increased from 60 to 80, we can obtain CNR¡Ù46~51 dB,
CSO¡Ø-65.5~-71 dBc, and CTB¡Ø-55~-60.4 dBc. According to preceding
description, we know that our trensmitter can carry 60 ~ 80 NTSC
channels.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0627100-050426 |
| Date | 27 June 2000 |
| Creators | Lin, Hsien-Sheng |
| Contributors | Tao-Yuan Chang, Yuang-Kuang Chen, Wood-Hi Cheng, Yin-Chieh Lai, Yuan-Kuang Tu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0627100-050426 |
| Rights | withheld, Copyright information available at source archive |
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