Design And Development Of Simplex-To-Full Duplex Converter (Sfdc)
Existing fiber optic network employ simplex transmission scheme where two fibers are needed, each to transmit and received signals between connecting points. The increasing demand has seen fiber, particularly in the metro area, are used up in no time. The conventional solution is to install new f...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
2002
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/12095/1/FK_2002_61.pdf |
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| Summary: | Existing fiber optic network employ simplex transmission scheme where two fibers
are needed, each to transmit and received signals between connecting points. The
increasing demand has seen fiber, particularly in the metro area, are used up in no time.
The conventional solution is to install new fibers to support new customers. However
fiber installation are always expensive and fussy. Thus, a new approach is desirable in
solving the problem. In this thesis, new technique is proposed to double the link
bandwidth by fully utilizing the two fiber cores.
The technique is based on the basic ligthwave principle that two photons do not know
each other. Therefore the optical signals, transmitted and received ones can be made to
propagate in the opposite direction in the same fiber, as long as they can be split and
isolated at the receiver side. The techniques proposed here in achieving the goal is
simple but quite powerful. The components used in developing the device are all
passive products. Each of them was characterized prior to developing them according to
the design. Then the whole device was tested further both on its own, and in network
environment.From the tests conducted, it is important to reduce the reflection from transmitters to
adjacent receivers, which is due to SFDC directivity. From the study it is found that the
minimum isolation needed between actual and reflected signal to achieve good
transmission quality is around 13 dB. Testing on SDH network was successfully
conducted on over 50 km fiber link with zero errors. The test was conducted in both
laboratory and testbed environment, with cooperation from Telekom Malaysia. Testing
on WDM system was conducted in laboratory environment only. The test shows that no
error is introduced. Finally it is concluded that SFDC is reliable to be used as a device to
realize full duplex transmission, as its realization would result in huge increase in fiber
bandwidth utilization with minimum installation and maintainance complexity and cost. |
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