An adiabatic silica taper based on two sequential tapering routines
Microfiber-based devices have a great potential in many applications due to their extraordinary optical and mechanical properties. An adiabatic silica-based taper is required for most of the applications and thus, adiabaticity criterion has to be estimated and satisfied to avoid high optical loss...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
National Institute of Optoelectronics
2017
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/58848/ http://irep.iium.edu.my/58848/ http://irep.iium.edu.my/58848/1/1Al-Askari.pdf http://irep.iium.edu.my/58848/7/An%20adiabatic%20silica%20taper%20based%20on%20two%20sequential%20tapering%20routines_SCOPUS.pdf |
| Summary: | Microfiber-based devices have a great potential in many applications due to their extraordinary optical and mechanical
properties. An adiabatic silica-based taper is required for most of the applications and thus, adiabaticity criterion has to be
estimated and satisfied to avoid high optical loss emerging when taper’s profile is not controlled properly. This requires
obtaining propagation constants via solving boundary condition problem at each position along the taper. Yet, this
procedure involves intensive computational and time-consuming solving of complex Maxwell vector equations. This paper
proposed an efficient method to model the taper profile, evaluate the adiabaticity and simulate it using Finite Element
Analysis software. The model facilitates design phase and optimize fabrication process for any fiber-based device. A slow
gradual radius reduction rates can guarantee adiabatic profiles with the expense of longer transition sections. In miniature
devices, such as sensors and micro-resonators, transition regions are preferable to be as short as possible while the narrow
waist is preferred to be long and uniform. To balance between short transition preference and low loss condition, we
proposed a design based on two tapering sequential routines. The simulation results confirmed our design adiabaticity.
From the optical spectrum of the fabricated taper, it is found that the loss is less than 1dBm and the spectrum is not
distorted. |
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