All-fiber integrated saturable absorber-tunable wavelength filter for Q-switching laser in both Cand L-bands

Byungjoo Kim, Seongjin Hong, Jaedeok Park, Yeom Dong-Il, Kyunghwan Oh

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We proposed and experimentally demonstrated combining a nonlinear optic saturable absorber and a wideband-tunable spectral filter in a single graphene oxide (GO) film deposited fiber optic device. The GO film was prepared on the cleaved facet of an optical fiber applying two sequential processes: The electrical deposition to make a thick GO film using an arc fusion splicer, followed by the laser pulse drilling to form a multi-layered GO film. The GO deposited fiber facet and a pristine fiber facet formed an asymmetric Fabry-Perot interferometer (FPI), whose spectral response was flexibly controlled by adjusting the air gap between them. An all-fiber ring laser cavity was built using the proposed device as a tunable saturable absorber along with erbium-doped fiber as a gain medium in the L-band. Stable Q-switching laser pulse trains were successfully generated, whose pulse duration was in the order of a few microseconds and its peak wavelength was tunable over 40nm from 1564 to 1604nm covering both C-and L-bands. At a certain condition, we also obtained Q-switching pulses simultaneously lasing at the double wavelengths, 1573.3 and 1586.7nm. Detailed device fabrication processes and laser characteristics are described to elucidate the high potential of 2-dimensional material films in nonlinear optics.

Original languageEnglish
Pages (from-to)13183-13192
Number of pages10
JournalOptics Express
Issue number9
Publication statusPublished - 2021 Apr 26

Bibliographical note

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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