<p>Electro-optic phase
modulation can be used to generate high repetition rate optical frequency
combs. The optical frequency comb (OFC) has garnered much attention upon its
inception, acting as a crucial component in applications ranging from metrology
and spectroscopy, to optical communications. Electro-optic frequency combs (EO
combs) can be generated by concatenating an intensity modulator and phase
modulator together. The first part of this work focuses on broadening the
modest bandwidth inherent to the EO combs. This is achieved by propagation in a
nonlinear medium, specifically propagation in a nonlinear optical loop mirror
(NOLM). This allows for broadening the EO frequency comb spectrum to a
bandwidth of 40 nm with a spectral power variation
of < 10 dB. This spectrally broadened EO comb is then used in dual comb
interferometry measurements to characterize the single soliton generated in an
anomalous dispersion silicone-nitride microresonator. This measurement allows
for rapid characterization with low average power. Finally, electro-optic phase
modulation is used in a technique to prove frequency-bin entanglement. A
quantum network based on optical fiber will require the ability to perform
phase modulation independent of photon polarization due to propagation in
optical fiber scrambling the polarization of input light. Commercially
available phase modulators are inherently dependent on the polarization state
of input light making them unsuited to be used in such a depolarized
environment. This limitation is overcome by implementing a polarization
diversity scheme to measure frequency-bin entanglement for arbitrary
orientations of co- and cross- polarized frequency-bin entangled photon pairs.</p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/8336780 |
| Date | 15 August 2019 |
| Creators | Oscar E Sandoval (6887678) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/Electro-Optic_Phase_Modulation_Frequency_Comb_Generation_Nonlinear_Spectral_Broadening_and_Applications/8336780 |
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