Design and Development of Variable Fiber Optic Coupler
This thesis presents the research works on design, development and analysis of variable fiber optic coupler. The fiber couplers are devices that distribute light from a main fiber into one or more branches of fibers which can be used as a power divider, wavelength-division multiplexer (WDM) and...
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| Format: | Thesis |
| Language: | English |
| Published: |
2006
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/6093/1/FK_2006_3.pdf |
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| Summary: | This thesis presents the research works on design, development and analysis of
variable fiber optic coupler.
The fiber couplers are devices that distribute light from a main fiber into one or more
branches of fibers which can be used as a power divider, wavelength-division
multiplexer (WDM) and optical switches. These couplers are important in all fiber
optic networks as they are used in long haul, metro, distribution and access fiber
networks. With the widely increasing deployment of metropolitan area network, fiberto-
the-home (FTTH) and cable TV networks, the market potential for the fiber
couplers is becoming larger.
However, most of the fiber couplers can only provide a fixed optical coupling ratio
which is unable to provide flexibility, reliability and scalability. The evolution of the
telecommunications networks has created an increasing demand for the variable fiber couplers, but there are some limitations of the existing variable fiber couplers such as
unstable, small tuning range of coupling ratio, high in loss and costly. Hence, this
gives rise to the need for searching new design of developing better performance
variable fiber couplers. The new design utilize a fix coupling ratio Fused Biconical
Tapered (FBT) coupler that is involved low loss coupling process and low in cost.
This coupler is known as a Variable Fiber Optic Coupler (VFOC).
There are two approaches used in this thesis that are simulation and experimentation.
The simulation is important in designing the VFOCs, as through the simulation
process, the characteristic of the design VFOCs can be determined. The successful
simulation is then realized through the experimentation, which is included the
fabrication of the VFOCs. However, the results obtained from the experiments are
slightly different from the simulation results. These are due to the losses in the
experiments and the ideal environment in the simulation.
In the experiment, the variable coupling ratio is achieved by applying deflection to the
fabricated FBT couplers. The dependency of the variable coupling ratio on the
deflection is elaborated. It is found that in the range of 0.8 mm deflection, the coupling
ratio can be varied from 11% to 92% with the excess loss less than 0.1 dB. |
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