1. Dual Acousto-Optical Tunable Filter (AOTF) University of California Irvine David Tseng Mentor: Rong Huang PI: Professor Henry Lee

2. Overview Introduction of an AOTF –Application & Motivation Construction of an AOTF Experimental results based on different fibers (SMF, PMF and DCF) Future work

3. Applications of an AOTF Applicable to wavelength division multiplexing (WDM) in fiber optic communication network For spectrometry applications: Broadband Infrared (BBIR) Tunable Camera Filter (TCF), Portable NIR Spectrometer, and Portable Optical Spectra Analyzer (POSA)

4. The Fashion of Frequency In communications AM0.300 MHz to 3 MHz FM30 MHz to 300 MHz TV50 MHz to 450 MHz Cell Phone850/900/1800/1900 MHz Cell WLAN2 GHz WLAN2.4 GHz Optical~THz

5. Introduction of an AOTF ---- Interaction principle Jacket Cladding Core PhotonPhonon Photon Core

6. Introduction of an AOTF Conditions for photon-phonon interaction to happen –Conservation of energy –Conservation of momentum Specifications of its spectrum –It is narrow band, which means it only happens at certain range. –It is a notch filter. –The resonator wavelength can be tuned electrically. –The depth of notches can be tuned electrically.

7. Introduction of an AOTF OSA LED RF Generator Stripped fiber PC

8. Construction of an AOTF -----Piezoelectric Transducer (PZT) Source of Acoustic energy Degree of freedom and flexibility Shear mode

9. Construction of an AOTF -----Piezoelectric Transducer (PZT) Sheer Mode PZT Compression Tension Longitudinal Mode PZT RF Generator Stripped fiber RF Generator Stripped fiber

10. Construction of an AOTF ----Experimental Setup

11. Method tried to increase its efficiency –Find a right range of its resonate frequency Optimize its shape (physical dimension) Find right materials –Self-heating problem Cooling down system---heat sink –The optimization of the materials in between Super glue---easy to do but can’t stand long and high temperature Solder---- not easy to do but better performance

12. Construction of an AOTF ---- Experimental Setup Acousto-Optical Tunable Filter Dual-sheer mode PZT setup

13. Experimental Results ---- SMF, PMF and DCF TE 01 TM 01 HE 21

14. Future Work Acoustic impedance matching network--- increase the acoustic efficiency AOTF can be used to measure properties of different kinds of fibers This notch filter can be converted into a band- pass filter.

15. Acknowledgements Professor Henry Lee – Opportunity and inspiration and encouragement Ph.D Student Rong Huang – PMF, Efficiency Ph.D Student Fares Alhassen – Concepts, polarization M.S. Student Alvin Wong – KLM model, characterization, OSA IM-SURE NSF