Narrow linewidth DFB waveguide laser fabricated via ultrafast laser inscription

Yuwen Duan*, Peter Dekker, Esa Jaatinen, Scott Foster, Martin Ams, M. J. Steel, Michael J. Withford

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Linewidth measurement of a femtosecond laser direct-written distributed feedback (DFB) waveguide laser (WGL) is reported. The WGL was fabricated in Yb-doped phosphate glass using the femtosecond laser direct-write technique. The linewidth was measured using a loss-compensated recirculating delayed self-heterodyne interferometer. By recirculating the output signal in a 10.2-km fiber delay loop, the linewidth was measured to be 35.4±1.4 kHz at a delay time of 306 μs , which is comparable with that of narrow-linewidth fiber DFB lasers.

Original languageEnglish
Article number2359467
Pages (from-to)2499-2502
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number24
Publication statusPublished - 15 Dec 2014


  • Lasers
  • fabrication and characterization
  • waveguides


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