We developed various optical devices and integrated optical devices based on innovative nano-optical structures and design. The nano-optical devices and integrated devices were fabricated through a nano-manufacturing platform based on wafer level nano-replication with mold and nano-pattern transfer by nano-lithography. The nano-replication process, which based on imprinting a single-layer spin-coated UV curable resist, achieved excellent nano-patterning fidelity and on-wafer uniformity with high-throughput. Excellent wafer level performance and yield were achieved. Nano-optic devices, such as, quarter wave plates and polarizers, and integrated nano-optical devices, such as monolithically integrated semi-isolators, were manufactured with the nano-manufacturing platform. The developed technology is suitable for high-throughput and low cost manufacturing needs for commercializing nano-structure based optical devices and integrated optical devices.
This article describes a new hybrid fiber-optic component invented by the authors, iPBCTM/iPBS$_TM), which has the functionality of a Polarization Beam Combiner/splitter (PBC/PBS) with isolation in the backward optical path. 0.3dB combining loss and 30dB isolation are demonstrated in the forward and backward optical paths respectively. PBCs are widely used in Raman amplifiers. They provide a simple way to combine two optical pumping sources into a single beam to increase the optical pumping power and provide equal polarizations in two orthogonal directions. Inside pump lasers, it is difficult to use a free space isolator to get rid of back reflections since most of the Raman pump lasers use Fiber Bragg Gratings (FBGs) to stabilize pumping wavelengths. One way to solve this problem is to use an iPBCTM to provide high combining efficiency in the forward direction and high optical isolation in the backward direction. This new hybrid device has been designed and fabricated in our laboratory and has demonstrated 0.3dB combining loss and 30dB peak isolation. It enables a new generation of Raman amplifiers with higher performance, smaller footprint and lower cost.
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