A tunable ultra-narrowband filter for subcarrier processing and optical monitoring

A tunable filter with power complementary outputs and optimal isolation is presented that operates on multiple tones. A triple-peak filter with sub-GHz bandwidth and over 25 dB isolation was realized with sub-milliwatt thermo-optic switching power.

[1]  P.-T. Ho,et al.  Compact microring notch filters , 2000, IEEE Photonics Technology Letters.

[2]  C. Madsen.  Chromatic and polarization mode dispersion measurement technique using phase-sensitive sideband detection , 2001, OFC 2001. Optical Fiber Communication Conference and Exhibit. Technical Digest Postconference Edition (IEEE Cat. 01CH37171).

[3]  A.E. Willner.  Implementing subcarrier-based control in optical networking , 2002, 2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278).

[4]  C.K. Madsen,et al.  General IIR optical filter design for WDM applications using all-pass filters , 2000, Journal of Lightwave Technology.