Design of a widely tunable laser with a chirped ladder filter

Takaaki Kakitsuka*, Shinji Matsuo, Seok Hwan Jeong, Toru Segawa, Hiroshi Okamoto, Yoshihiro Kawaguchi, Yasuhiro Kondo, Yuzo Yoshikuni, Hiroyuki Suzuki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We theoretically investigated a digitally tunable laser with a chirped ladder filter and a ring resonator to obtain a wide wavelength tuning range covering the whole C- or L- band. The clear relation between the tuning range and laser structure, especially the ladder filter, is described analytically. The introduction of a chirped structure into a ladder filter is effective in achieving both wide tunability and a stable lasing mode. A numerical simulation based on multimode rate equations shows that a tuning range of over 40 nm and a mode suppression ratio over 40 dB can be achieved by introducing a chirped ladder filter.

Original languageEnglish
Pages (from-to)1053-1060
Number of pages8
JournalOptical and Quantum Electronics
Issue number12-14
Publication statusPublished - 2006 Sept
Externally publishedYes


  • Gain
  • Ladder
  • Rate equation
  • Ring
  • Tunable laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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