Effects of side-coupling on the phase response of cascaded microring all-pass filters

✍ Scribed by Wenge Yang; Amitabh Joshi; Min Xiao

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 317 KB
• Volume: 232
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2003.12.068

✦ Synopsis

All-pass filters are useful devices that allow phase correction or equalization of signal without introducing any amplitude distortion. We present a new design scheme in which a grating is introduced in the interaction region of the two adjacent microrings in a cascaded multiring structure. The analysis accounts for the counter-directional coupling between the two waveguides. Theoretical analysis shows that this side-coupling can effectively double the filter order thus either give better performance with the same filter order or decrease the filter dimensions with the same performance.