Dr. Arash Hosseinzadeh Profile

Dr. Arash Hosseinzadeh

Photonic Design Engineer

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Proceedings Article | 25 February 2016 Paper

Design and optimization of polymer ring resonator modulators for analog microwave photonic applications

Arash Hosseinzadeh, Christopher Middlebrook

Proceedings Volume 9747, 97471L (2016) https://doi.org/10.1117/12.2219916

KEYWORDS: Modulators, Resonators, Microwave photonics, Polymers, Analog electronics, Electro optic polymers, Modulation, Antennas, Mach-Zehnder interferometers, Electrooptic modulators, Waveguides, Tolerancing

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Efficient modulation of electrical signals onto an optical carrier remains the main challenge in full implementation of microwave photonic links (MPLs) for applications such as antenna remoting and wireless access networks. Current MPLs utilize Mach-Zehnder Interferometers (MZI) with sinusoidal transfer function as electro-optic modulators causing nonlinear distortions in the link. Recently ring resonator modulators (RRM) consisting of a ring resonator coupled to a base waveguide attracted interest to enhance linearity, reduce the size and power consumption in MPLs. Fabrication of a RRM is more challenging than the MZI not only in fabrication process but also in designing and optimization steps. Although RRM can be analyzed theoretically for MPLs, physical structures need to be designed and optimized utilizing simulation techniques in both optical and microwave regimes with consideration of specific material properties. Designing and optimization steps are conducted utilizing full-wave simulation software package and RRM function analyzed in both passive and active forms and confirmed through theoretical analysis. It is shown that RRM can be completely designed and analyzed utilizing full-wave simulation techniques and as a result linearity effect of the modulator on MPLs can be studied and optimized. The material nonlinearity response can be determined computationally and included in modulator design and readily adaptable for analyzing other materials such as silicon or structures where theoretical analysis is not easily achieved.

Proceedings Article | 16 March 2015 Paper

Optical waveguides using PDMS-metal oxide hybrid nanocomposites

Arash Hosseinzadeh, Christopher Middlebrook, Michael Mullins

Proceedings Volume 9360, 93600P (2015) https://doi.org/10.1117/12.2080582

KEYWORDS: Waveguides, Polymers, Nanocomposites, Refractive index, Polymer multimode waveguides, Absorption, Photorefractive polymers, Ultraviolet radiation, Oxides, Titanium dioxide

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Development of passive and active polymer based optical materials for high data rate waveguide routing and interconnects has gained increased attention because of their excellent properties such as low absorption, cost savings, and ease in fabrication. However, optical polymers are typically limited in the range of their refraction indices. Combining polymeric and inorganic optical materials provides advantages for as development of nano-composites with higher refractive indices with the possibility of being used as an active optical component. In this paper a new composite material is proposed based on polymer-metal oxide nano-composites for use as optical wave guiding structures and components. PDMS (Polydimethylsiloxane) is utilized for the polymer portion while the inorganic material is titanium dioxide. Refraction indices as high as 1.74 have been reported using these composites. For PDMS-TiO₂ hybrids, the higher the ratio of titanium dioxide to PDMS, the higher the resulting refractive index. The index of refraction as a function of the PDMS:TiO₂ ratio is reported with an emphasis on use as optical waveguide devices. Absorption spectrum of the nano-composites is measured showing low absorption at 850 nm and high absorption in the UV regime for direct UV laser/light curing. Prototype multimode waveguides are fabricated using soft imprint embossing that is compatible with the low viscosity nano-composite material. Cross dimensional shape and profile show the potential for full scale development utilizing the material set.

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