Broadband optical frequency comb generation with flexible frequency spacing and center wavelength

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A broad-band optical frequency comb with flexible frequency spacing and center wavelength is proposed and experimentally demonstrated. The proposed scheme consists of a single continuous-wave laser, cascaded Mach-Zehnder modulator (MZM) and phase modulator (PM), two-stage dispersion-flattened highly nonlinear fibers (DF-HNLFs) and a single-mode fiber (SMF) in between. A narrow-band frequency comb is generated in the MZM and PM and a broad-band frequency comb is achieved by self-phase modulation (SPM) based spectral broadening in DF-HNLFs. Since the DF-HNLF has low dispersion over a wide wavelength range, the central wavelength of the generated frequency comb can be tuned from 1535 nm to 1564 nm. In addition, the central wavelength of frequency comb has a potential to be extended to L-band according to the dispersion profile of the DF-HNLF and the operation bandwidths of the MZM and PM. By tuning the driving radio-frequency (RF) signal, the frequency spacing of the generated frequency comb can be tuned. In the experiment, the frequency spacing of 25 GHz and 40 GHz has been achieved.
Original languageEnglish
JournalI E E E Photonics Journal
Issue number3
Number of pages6
Publication statusPublished - 2018
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

  • Fiber non-linear optics, Frequency combs, Dispersion (waves), Fiber , Fiber optics systems

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