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Highly efficient all-fiber tunable polarization filter using torsional acoustic wave
Optics Express
|June 24, 2009
Summary
We developed a tunable fiber optic polarization filter using acousto-optic coupling in birefringent fibers. This filter efficiently controls light polarization across a wide wavelength range.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Acousto-optic tunable filters (AOTFs) offer wavelength selectivity.
- Controlling light polarization is crucial for optical communication and sensing.
- Highly birefringent (Hi-Bi) fibers enable manipulation of light polarization modes.
Purpose of the Study:
- To demonstrate an all-fiber tunable polarization filter with high coupling efficiency.
- To investigate acousto-optic coupling between polarization modes in Hi-Bi fiber.
- To characterize the filter's performance over a specific wavelength range.
Main Methods:
- Utilizing acousto-optic coupling induced by traveling torsional acoustic waves.
- Employing a highly birefringent single-mode optical fiber to support two LP(01) polarization modes.
- Achieving over-coupling between the two polarization modes within the 1530 nm to 1610 nm wavelength range.
Main Results:
- Demonstrated an all-fiber tunable polarization filter with high coupling efficiency.
- Achieved over-coupling of polarization modes using acoustic waves over a broad spectral range (1530-1610 nm).
- Measured a 3-dB optical bandwidth of 4.8 nm around 1550 nm.
Conclusions:
- The proposed acousto-optic tunable filter in Hi-Bi fiber is effective for polarization control.
- The filter exhibits tunable characteristics and high coupling efficiency.
- This technology holds potential for applications in optical communications and sensing requiring precise polarization manipulation.
