Series-Coupled and Parallel-Coupled Add/Drop Filters and FSR Extension

  • Yasuo Kokubun
  • Tomoyuki Kato
Part of the Springer Series in Optical Sciences book series (SSOS, volume 156)


The shape of the filter response can be controlled by a combination of ring resonators, such as series coupling, parallel coupling, and cascade topology. In particular series coupling is effective to realize box-like spectrum responses, which are required for wavelength filtering in WDM systems for photonic networks. In this chapter, the transfer function of series-coupled ring resonators is derived using the matrix method, and the optimum conditions for coupling coefficients to realize the box-like filter response are described. In addition, the free spectral range (FSR) extension method using the Vernier effect in series-coupled ring resonators with dissimilar radii will be discussed. Last, the transfer function of parallel-coupled ring resonators is derived and an application to interleaving is introduced.


Spectrum Response Coupling Efficiency Ring Resonator Resonant Wavelength Free Spectral Range 
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Copyright information

© Springer-Verlag US 2010

Authors and Affiliations

  1. 1.Graduate School of EngineeringYokohama National UniversityYokohamaJapan
  2. 2.Photonics Laboratory, Network Systems LaboratoriesFujitsu Laboratories Ltd.KawasakiJapan

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