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Ultrawidely tunable single-mode fiber acousto-optic filter
Sun Do Lim1, Kyung Jun Park, Sunghoon Eom
1Photonics Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea. sdlim@kist.re.kr
Optics Letters
|April 12, 2011
Summary
A novel single-mode fiber acousto-optic tunable filter (AOTF) demonstrates a wide tuning range over 300 nm. This advanced fiber design enables precise wavelength selection for optical filtering applications.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Acousto-optic tunable filters (AOTFs) are crucial for wavelength selection in optical systems.
- Conventional single-mode fibers (SMFs) have limitations in achieving wide tuning ranges for AOTFs.
- Optimizing mode-index differences in SMFs is key to enhancing AOTF performance.
Purpose of the Study:
- To demonstrate a single-mode fiber acousto-optic tunable filter (SMF AOTF) with an extended tuning range.
- To investigate the impact of a novel SMF structure on AOTF performance.
- To achieve a single resonance peak across a broad wavelength spectrum.
Main Methods:
- Fabrication and characterization of a specialized SMF with a ring of symmetric holes in the cladding.
- Experimental setup for an AOTF utilizing the fabricated SMF.
- Measurement of the transmission spectrum and resonance peaks under varying acoustic frequencies.
Main Results:
- Demonstration of an SMF AOTF with a tuning range exceeding 300 nm.
- The specialized SMF exhibited a larger mode-index difference between core and higher-order modes.
- A single resonance peak was observed in the transmission spectrum from 1.3 to 1.6 μm.
Conclusions:
- The novel SMF design significantly enhances the performance of AOTFs.
- This SMF AOTF offers a wide and stable tuning range for optical filtering.
- The findings pave the way for advanced tunable optical filter technologies.
