Abstract
Based on the flexibilities of light beam propagation in three dimensions, we propose an improved N-port optical quasi-circulator by using a pair of orthogonal holographic spatial- and polarization- modules. All optical elements are located in parallel planes that are perpendicular to the optical axis. The number of optical elements is decreased, and a higher performance optical quasi-circulator without crosstalk and polarization mode dispersion can be easily achieved. A prototype of 5-port polarizationindependent optical quasi-circulator operating at a wavelength of 1300nm was assembled and tested to show its validities.
Highlights
Optical circulators [1,2,3,4,5,6] are important passive devices that have nonreciprocal functions
Each holographic spatial- and polarization- modules (HSPMs) consists of a pair of holographic spatial walk-off polarizers (HSWPs) [8], a 45° Faraday rotator, and a 45° half wave-plate
In order to demonstrate the validity of our design, we used our fabricated HSPMs to assemble a prototype of 5-port polarization-independent optical quasi-circulator for 1300nm
Summary
Optical circulators [1,2,3,4,5,6] are important passive devices that have nonreciprocal functions. We proposed a multi-port polarization-independent optical quasi-circulator by using a pair of holographic spatial- and polarization- modules (HSPMs) [7]. Each HSPM consists of a pair of holographic spatial walk-off polarizers (HSWPs) [8], a 45° Faraday rotator, and a 45° half wave-plate It has many advantages such as polarization-independence, compactness, high isolation, low polarization mode dispersion, easy fabrication, and the number of ports can be scaled up its optical components and its optical routes are restricted in one plane including the optical axis. Its operating principles and the performance of this device are discussed
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