All-fiber idirectional passively mode-locked ring laser

Research output: Contribution to journalArticlepeer-review

173 Scopus citations


We report the design and operation of a novel all-fiber bidirectional passively mode-locked ring laser. An erbium-doped fiber was chosen as the active element in a ring cavity arrangement. A short segment of a fiber taper embedded in carbon nanotubes/polymer composite, acting as a saturable absorber, was used to enable bidirectional mode locking. The laser generates two stable femtosecond pulse trains in opposite directions. A beat note of about 2 MHz, having a bandwidth of less than 2 kHz, is measured when the pulses propagating in opposite directions are (temporally) overlapped at a photodetector. We believe this device will find important applications in precision rotation sensing.

Original languageEnglish (US)
Pages (from-to)64-66
Number of pages3
JournalOptics letters
Issue number1
StatePublished - Jan 1 2008

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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