Title page for ETD etd-10142005-103109
|Type of Document
||Andrawis, Alfred S.
||A new compound modulation technique for multi-channel analog video transmission on fiber
|Bostian, Charles W.
|Claus, Richard O.
|Kohler, Werner E.
|Pratt, Timothy J.
- Optical fibers.
- Modulation (Electronics) Mathematical models.
- Fiber optics.
|Date of Defense
Present analog optical fiber multi-channel video transmission systems are
very sensitive to laser nonlinearities and are consequently limited in the optical
modulation depth (OMD) that may be used. This, in turn limits the power budget
achievable, signal-to-noise ratio, and the channel capacity.
In this dissertation a new analog transmission technique for multi-channel
TV transmission on fiber USIng frequency modulation/pulse amplitude
modulation/time division multiplexing (FM/TDM) is described and compared with
present digital and analog systems. Parameters for the proposed system are
selected and the relationship between the performance and parameter values is
discussed. Analysis and simulations indicate that the proposed system has a very
low sensitivity to nonlinearities and is similar to that of digital systems, and much
better than current Frequency Modulated/Frequency Division Multiplexed
(FM/FDM) systems. This permits the use of higher OMD (as high as in digital
systems), which results in achieving a high signal-to-noise ratio and a large power
budget. Analysis of the number of channels as a function of adjacent channel
intersymbol interference indicates that the proposed system has a better spectral
efficiency than present analog systems. Simulations are also used to predict the
performance of the proposed system with laser diodes poorer than the ones
presently used for multi-channel analog systems. Considerably poorer lasers may
be used while achieving acceptable transmission quality. Finally, carrier-to-noise
penalty caused by timing errors and jitter effects are analyzed.
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