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Zn‐diffused LiNbO 3 2 × 2 balanced‐bridge optical switch with post thermal‐treatment
Author(s) -
Twu RueyChing
Publication year - 2004
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.20182
Subject(s) - power dividers and directional couplers , microwave , materials science , optical switch , waveguide , insertion loss , optics , voltage , optical power , optoelectronics , thermal , splitter , crosstalk , electrical engineering , telecommunications , physics , engineering , laser , meteorology
A Zn‐diffused 2 × 2 balanced‐bridge optical switch is demonstrated on a Z‐cut LiNbO 3 substrate for the first time. A post thermal‐treatment is used for precisely maintaining the 3‐dB‐power division of the two directional couplers in the device. The crosstalk ratio of both output waveguides is about −23 dB, while the measured propagation loss of a straight‐channel waveguide is kept within the range of 1.1–1.25 dB/cm. In the design, without using electrically controllable couplers as 3‐dB splitters or combiners, the total device length can be reduced to 18 mm. The switching voltage‐length product is 8.5 V‐cm for the TM polarized light at 1.32 μm. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 493–496, 2004; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/mop.20182