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http://dx.doi.org/10.3807/HKH.2008.19.1.036

Measurement of Hysteresis in PZT-Type Tunable Filters Utilizing OFDR  

Park, Do-Hyun (School of Electronics and Information / Institute for Laser Engineering Kyung Hee University)
Yeh, Yun-Hae (School of Electronics and Information / Institute for Laser Engineering Kyung Hee University)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.1, 2008 , pp. 36-42 More about this Journal
Abstract
Implementation of a wavelength-swept source with constant tuning rate adopting a PZT-type tunable filter, requires the knowledge of hysteresis of the filter used. The hysteresis must be considered to avoid any degradation in resolution of the optical frequency domain reflectometry (OFDR) system. An optical spectrum analyzer (OSA) could be used to do the hysteresis measurement, but its measurement time is too long for the high-speed driving conditions for the filter. We proposed a new hysteresis measurement method based on OFDR, which could measure the hysteresis in a real driving condition. A hysteresis measurement apparatus consisted of wavelength-swept source, interferometer, signal processing unit, and PC program is built and used to do the measurement. It is concluded that the new method is useful in the measurement of hysteresis at real driving conditions by successfully implementing a swept-wavelength source whose wavelength change is linear in time.
Keywords
Optical frequency domain reflectometry; Wavelength-swept source; PZT; Tunable filter; Hysteresis measurement;
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Times Cited By KSCI : 2  (Citation Analysis)
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