High UV Sensitivity of SiON Film and Its Application to Center Wavelength Trimming of Microring Resonator Filter

Satoshi UENO  Toshiki NAGANAWA  Yasuo KOKUBUN  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.5   pp.998-1004
Publication Date: 2005/05/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.5.998
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Section on Recent Progress in Optoelectronics and Communications)
Category: Optical Passive Devices and Modules
Keyword: 
microring resonator,  UV sensitivity,  trimming,  SiON,  

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Summary: 
We demonstrated a vertically coupled microring resonator (VCMRR) filter as an Add/Drop wavelength filter. However, the accuracy of center wavelength was not sufficiently high for dense wavelength division multiplexing (DWDM) systems. Thus, a UV trimming technique using a SiN (n=2.01 at λ=1.55 µm) ring core was previously developed. Although a wide center wavelength trimming range of -12.1 nm and the long-term stability of center wavelength were realized, the core size required for single-mode propagation was too small for fabrication using a photolithography process. Therefore in this study, we introduced SiON as the microring core to relax the single-mode condition of core size. We discovered a large UV sensitivity of SiON film formed by a PECVD method, and a wide range UV trimming of microring resonator of -10.5 nm was demonstrated using this phenomenon.