Narrow-linewidth tunable lasers with retro-reflective external cavity

Ning Wang, Ming Feng, Zhiqing Feng, Man Ying Lam, Lei Gao, Bo Chen, A. Q. Liu, Yuen Hong Tsang, Xuming Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


This letter presents the development of a fiber-pigtailed narrow-linewidth tunable laser that utilizes a retro-reflective optical system to construct the external cavity. For wavelength selection, a fixed etalon is employed to provide the International Telecommunication Union (ITU) grid with the 50-GHz spacing and a lead zirconate titanate-actuated tunable filter to select one ITU mode to resonate. The laser device measures a linewidth of 7 kHz, an output power of 14 dBm, a sidemode suppression ratio (SMSR) >f55 dB, a tuning range >40 nm, and a response speed ∼2 ms. The superior performance well demonstrates the advantages of external cavity construction for the narrow-linewidth tunable lasers and may find applications in the emerging digital coherent communications.
Original languageEnglish
Article number6253231
Pages (from-to)1591-1593
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number18
Publication statusPublished - 10 Sept 2012


  • Digital coherent communications
  • external cavity tunable laser
  • laser tuning
  • narrow linewidth

ASJC Scopus subject areas

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


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