A coplanar strip slow wave structure for the optical directional coupler modulators

Jaesang Oh, Anand Gopinath

Research output: Contribution to journalArticlepeer-review


A design of a coplanar stripline (CPS) slow wave structure, which has for the first time both series inductive and shunt capacitive sections, has been developed. It has been designed to match the RF/microwave modulation signal phase velocity to the optical wave velocity in GaAs optical waveguides. In this design, the CPS with series inductances and shunt capacitances retains the characteristic impedance at 50 Ω. This slow wave structure provides flexibility of design for narrow gap CPS structures. The effective refractive index and characteristic impedance of this design have been measured in the frequency range of up to 45 GHz and compared to simulations.

Original languageEnglish (US)
Article number5350395
Pages (from-to)7-9
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number1
StatePublished - Jan 2010

Bibliographical note

Funding Information:
Manuscript received July 24, 2009; revised September 04, 2009. First published December 08, 2009; current version published January 08, 2010. This work was supported in part by a subcontract from SPAWAR and in part by a Grant from KG Technology Associates, Inc.


  • Directional coupler modulator
  • Impedance matching
  • Slow wave transmission line
  • Velocity


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