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Student of the Year Presentations

Wednesday, March 23, 2011 12:00 PM to 1:00 PM
CREOL Room 102 & 103

Dimitrios Mandritis

"A low noise Theta laser with an intra-cavity Fabry-Pérot etalon and high precision etalon characterization"

The talk will present an extensive investigation of a chirped-pulse semiconductor-based Theta cavity design laser with an intra-cavity Fabry-Pérot etalon operating at 100 MHz repetition rate. A fiberized Fabry-Pérot periodic filter inserted within the Theta laser cavity mitigates the contribution of the supermode noise to the pulse-to-pulse energy variance by >10 times. Long-term stability is attained by referencing the cavity length to the etalon using a modified intra-cavity Hänsch-Couillaud locking scheme. Moreover, the high precision characterization of the etalon used in the Theta laser will be presented. A narrow linewidth laser source is used in conjunction with an acousto-optic modulator resulting in 10 parts per billion precision. The Theta laser can be used in photonic ADC and optical coherence tomography among other applications.

Likai Zhu

"Computationally efficient digital compensation of fiber nonlinearity"

This presentation is focused on the folded digital backward propagation (DBP) method which reduces the computational load of split-step DBP for fiber nonlinearity compensation. In long-haul transmission systems, the waveform evolution is dominated by fiber dispersion. For a periodically dispersion-managed fiber link, taking advantage of the periodic waveform evolution, nonlinear effects accumulated in a large number (K) of dispersion periods/spans can be compensated using DBP for a single dispersion period with K times the nonlinearity. For a fiber link with an arbitrary dispersion map, DBP of a large number of spans can be folded into one span according to accumulated dispersion. Using this “folded-DBP” method, the required computation for nonlinearity compensation of transoceanic transmission systems can be reduced by up to 2 orders of magnitude.

Thomas Kohlgraf-Owens

"Exploiting disorder for absolute measurements"

Homogeneous materials are ubiquitous in most optical devices used to map characteristics of light onto measurable quantities. Disordered media on the other hand are usually considered to be a nuisance as they lead to an intricate scrambling of the light’s properties. However, the scattering inside a random material can be regarded as a deterministic, albeit complicated, encoding the properties of incident light. We have demonstrated, for the first time that such complex systems can be used to perform instantaneous spectral and polarimetric measurements in a spatially resolved manner. “Disordered measurement systems” have unique characteristics that are of interest for both in vivo biomedical measurements and remote sensing.

CREOL Student of the Year Finals 2011 Abstracts&bios.pdf

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