Analysis of a second-order polarization-independent filter made of a single ring resonator and a Sagnac interferometer

✍ Scribed by Fufei Pang; Feng Liu; Xiuyou Han; Haiwen Cai; Ronghui Qu; Zujie Fang

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 299 KB
• Volume: 260
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2005.11.036

✦ Synopsis

A novel second-order polarization-independent filter made of a single ring resonator and a Sagnac interferometer (SRRSI) is proposed, and its filtering characteristics are investigated. By using birefringence in waveguide, a single ring resonator can be used to synthesize a filter with second-order response. Analytical formulas are derived for characteristics of the SRRSI varied with waveguide parameters, such as the coupling coefficient; and the critical condition of a second-order Butterworth filter is given. The influence of loss in the ring resonator is also analyzed.