Open AccessPhase-shifted Solc-type filter based on thin periodically poled lithium niobate in a reflective geometry
Author(s) -
Tao Ding,
Yuanlin Zheng,
Xianfeng Chen
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.012016
Subject(s) - lithium niobate , optics , materials science , polarizer , optical filter , optoelectronics , group delay and phase delay , birefringence , polarization (electrochemistry) , bandwidth (computing) , physics , telecommunications , chemistry , computer science
Configurable narrow bandwidth filters are indispensable components in optical communication networks. Here, we present an easily-integrated compact tunable filtering based on polarization-coupling process in a thin periodically poled lithium niobate (PPLN) in a reflective geometry via the transverse electro-optic (EO) effect. The structure, composed of an in-line polarizer and a thinned PPLN chip, forms a phase-shift Solc-type filter with similar mechanism to defected Bragg gratings. The filtering effect can be dynamically switched on and off by a transverse electric filed. Analogy of electromagnetically induced transparency (EIT) transmission spectrum and electrically controllable group delay is experimentally observed. The mechanism features tunable center wavelength in a wide range with respect to temperature and tunable optical delay to the applied voltage, which may offer another way for optical tunable filters or delay lines.