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Widely tunable long-period waveguide grating couplers.

Y Bai, Q Liu, K P Lor

|June 18, 2009

Summary

We demonstrated tunable optical couplers using polymer waveguide gratings. These devices show potential for broadband add/drop multiplexers and signal dividers.

Area of Science:

Photonics
Materials Science
Optical Engineering

Background:

Optical couplers are essential components in fiber optic communication systems.
Tunable optical components enable dynamic control over light signals.
Long-period gratings offer a versatile platform for optical device development.

Purpose of the Study:

To experimentally demonstrate widely tunable optical couplers.
To investigate the performance of couplers based on parallel long-period polymer waveguide gratings.
To explore the thermal tunability of these optical couplers.

Main Methods:

Fabrication of two types of optical couplers using parallel long-period polymer waveguide gratings.
Experimental characterization of coupling efficiency and resonance wavelength.

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Thermal tuning of the resonance wavelength and measurement of sensitivity.

Comparison of experimental results with coupled-mode analysis.

Main Results:

A two-parallel-grating coupler achieved a peak coupling efficiency of ~34% with thermal tunability of 4.7 nm/°C.
A ten-grating array coupler showed a peak coupling efficiency of ~11% with thermal tunability of -3.8 nm/°C.
Experimental results were in good agreement with coupled-mode analysis.

Conclusions:

Demonstrated the feasibility of widely tunable optical couplers using polymer waveguide gratings.
Highlighted the potential of these couplers for applications in broadband add/drop multiplexers and signal dividers.
Confirmed the effectiveness of thermal tuning for controlling coupler resonance wavelength.