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Synthesis, decomposition and phase homogeneity of PLZT powder and microstructural evolution on densificationAkbas, Mehmet Ali January 1995 (has links)
No description available.
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Electric field birefringence and light scattering of polydisperse colloidsWatson, Rupert M. J. January 1992 (has links)
No description available.
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An optical sensor for the non-interactive detection of weak electric fieldsPaton, C. R. January 1986 (has links)
No description available.
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Novel optical fibres and their applicationsLi, L. January 1989 (has links)
No description available.
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Analysis of change in surface form using digital image processingKoukash, M. B. Q. S. January 1987 (has links)
No description available.
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Electro-Optic Polymers: Materials and DevicesDeRose, Christopher Todd January 2009 (has links)
Electro-optic (EO) polymers are an attractive alternative to inorganic nonlinear materials. EO polymers with a Pockel's coefficient, r33, greater than 320 pm/V have been recently demonstrated. In addition to their high EO activity, EO polymers have the additional benefit that their dielectric constants at optical and millimeter wave frequencies are closely matched which allow for bandwidths which are limited only by the resistive losses of traveling wave electrodes. The amorphous nature of the host polymer makes heterogeneous integration of the materials on any substrate possible. The devices which will have the most immediate impact based on these recent materials developments are EO waveguide modulators. Performance benchmarks of less than 6 dB insertion loss, sub-volt Vpi and greater than 100 GHz bandwidth have been achieved separately however, the challenge of achieving all of these benchmarks in a single device has not yet been met.The aim of this dissertation is to optimize passive materials to achieve efficient in device poling of EO polymers, optimize the chromophore loading of the active polymers and to optimize waveguide modulators for device performance within a particular system, analog RF photonic links. These optimizations were done by defining figures of merit for the materials and modulators. This research strategy has led to significant improvements in poling efficiency as well as modulators with record low insertion losses which maintain a low half-wave voltage; on the order of 1 - 2 Volts. Using this optimization strategy and state of the art EO polymers, devices which meet or surpass the benchmark performance values in all categories are expected in the near future.
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Ferroelectric liquid crystal polymersVerrall, Mark Andrew January 1999 (has links)
No description available.
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Tunable erbium-doped fiber ring laser using an intra-cavity filterFadel, Hicham Joseph 15 November 2004 (has links)
Linear tuning the frequency of an erbium-doped fiber ring laser using both a Fabry-Perot filter and an electro-optic tunable filter has been experimentally demonstrated. The rate of frequency change is determined by monitoring the fringes produced by laser light transmitted through a fiber Fabry-Perot interferometer. The fiber ring laser has been tuned over a 50 nm spectral range when using the Fabry-Perot filter and a tuning rate of 16480 nm/s has been achieved. The spectral width of the laser is 0.049 nm and the nearest sidelobe to the main peak is more than 30 dB below the central lobe. When the electro-optic tunable filter is used, a spectral range of 11 nm is reached. The spectral width is 2.33 nm and is in close agreement with the filter theoretical results. The sidelobe to main peak difference is around 13 dB.
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Tunable erbium-doped fiber ring laser using an intra-cavity filterFadel, Hicham Joseph 15 November 2004 (has links)
Linear tuning the frequency of an erbium-doped fiber ring laser using both a Fabry-Perot filter and an electro-optic tunable filter has been experimentally demonstrated. The rate of frequency change is determined by monitoring the fringes produced by laser light transmitted through a fiber Fabry-Perot interferometer. The fiber ring laser has been tuned over a 50 nm spectral range when using the Fabry-Perot filter and a tuning rate of 16480 nm/s has been achieved. The spectral width of the laser is 0.049 nm and the nearest sidelobe to the main peak is more than 30 dB below the central lobe. When the electro-optic tunable filter is used, a spectral range of 11 nm is reached. The spectral width is 2.33 nm and is in close agreement with the filter theoretical results. The sidelobe to main peak difference is around 13 dB.
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Programmable two-port polarization independent electro-optically tunable wavelength filter in lithium niobatePing, Yang 15 May 2009 (has links)
Programmable two-port polarization independent electro-optically wavelength
tunable filters based on asymmetric Mach-Zehnder structure in LiNbO3 substrate have
been developed for 1.55 µm application. The operation principle is based on
Mach-Zehnder interference and TE↔TM polarization conversion. Fabrication parameters
for channel waveguides, polarization converters and bandpass filters have been optimized.
Straight channel waveguides 7 µm in width were produced by diffusing 1116 Å thick Ti
into LiNbO3 substrate at 1035°C for 10 hours. Single mode guiding has been realized for
both TE and TM polarization. Insertion loss of 2.9 dB for TE polarization input and 3.3
dB for TM polarization input were achieved on a 46 mm long sample. Single sideband
programmable polarization mode converters were produced with 16 electrode sets, each
containing 64 grating periods. Programmability was achieved by applying spatially
periodic weighted independent voltages to interdigital electrode sets, and controlled
electronically via a personal computer through a digital-to-analog converter array chip.
Maximum conversion efficiency of more than 99% was realized for both TM→TE and
TE→TM, and was observed at 1530.48 nm. Two-port polarization independent electro-optically tunable wavelength filters were produced based on the results obtained
above. The 3 dB bandwidth is 1.1 nm and the nearest side lobes to the main transmission
are down by about 9 dB for uniform coupling. Side lobes are reduced to about 20 dB
below peak transmission after apodization, and the 3 dB bandwidths increased to ~ 1.3
nm as a result. Seven channels (channel -4, -2, -1, 0, +1, +2 and +4) were selectable by
programming the voltages on each electrode set. Channel spacing is 1.1~1.2 nm. The
tuning ranges from 1524.04 to 1533.56 nm. Fiber-to-fiber insertion loss of the filter at
center frequency is 4.3 dB for TE input and 4.2 dB for TM input. The polarization
dependent loss is < 0.5 dB for all selectable channels. The temporal response to a 21 V
step change in applied voltages was measured to be 586 ns for the 10%-90% rise time
and 2.308 µs for the 90%-10% fall time.
This research work provides a convenient scheme for making programmable
two-port tunable bandpass filters and ROADMs.
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