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Han J Y, Huang Y L, Wu J L, Li Z R, Yang Y D et al. 10-GHz broadband optical frequency comb generation at 1550/1310 nm. Opto-Electron Adv 3, 190033 (2020). doi: 10.29026/oea.2020.190033
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Original Article Open Access
10-GHz broadband optical frequency comb generation at 1550/1310 nm
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Abstract
The generation of high-repetition rate (frep ≥ 10 GHz) ultra-broadband optical frequency combs (OFCs) at 1550 nm and 1310 nm is investigated by seeding two types of highly nonlinear fibers (HNLFs) with 10 GHz picosecond pulses at the pump wavelength of 1550 nm. When pumped near the zero dispersion wavelength (ZDW) in the normal dispersion region of a HNLF, 10 GHz flat-topped OFC with 43 nm bandwidth within 5 dB power variation is generated by self-phase modulation (SPM)-based OFC spectral broadening at 26.5 dBm pump power, and 291 fs pulse trains with 10 GHz repetition rate are obtained at 18 dBm pump power without complicated pulse shaping methods. Furthermore, when pumped in the abnormal dispersion region of a HNLF, OFCs with dispersive waves around 1310 nm are studied using a common HNLF and fluorotellurite fibers, which maintain the good coherence of the pump light at 1550 nm. At the same time, sufficient tunability of the generated dispersive waves is achieved when tuning the pump power or ZDW.-
Keywords:
- optical comb /
- electro-optic devices /
- ultrafast optics /
- optical pulses /
- nonlinear optics
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References
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Supplementary Information
Supplementary information for 10-GHz broadband optical frequency comb generation at 1550/1310 nm 
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Han J Y, Huang Y L, Wu J L, Li Z R, Yang Y D et al. 10-GHz broadband optical frequency comb generation at 1550/1310 nm. Opto-Electron Adv 3, 190033 (2020). doi: 10.29026/oea.2020.190033
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Figure 1.
The 10 GHz OFC and a 2.3-ps pulse generated from a mode-locked laser with (a) OFC spectrum, and (b) reconstructed temporal pulse profile (blue solid curve) and Gaussian fitting curve (red dotted curve).
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Figure 2.
Optical spectra after propagation in 500 m HNLF.
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Figure 3.
(a) RF spectrum from the broadened frequency comb at 20 dBm pump power (RBW=200 kHz and VBW=50 kHz). (b) Reconstructed temporal pulse profile with a FWHM duration of 291 fs after transmitting a 4 m SMF at 20 dBm pump power (blue solid curve) and Gaussian fitting curve (red dotted curve).
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Figure 4.
Optical spectra of the generated flat-topped OFC.
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Figure 5.
(a) Experimental supercontinuum spectra designed to produce a dispersive wave centered around 1310 nm. (b) RF spectra from the generated 1310 nm dispersion wave at 32 dBm pump power (RBW=200 kHz and VBW=50 kHz).
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Figure 6.
The calculated dispersions of the fibers with different sizes. Insets, scanning electron microscope images of the fibers with the diameters of 3.7 μm, 3.3 μm and 3.1 μm, respectively.
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Figure 7.
(a) Optical spectra with a dispersive wave centered around 1310 nm from a fluorotellurite fiber under different launched powers of the femtosecond laser. (b) Optical spectra with tunable dispersive waves ranging from 1150 nm to 1310 nm from fluorotellurite fibers 1, 2, 3 with ZDWs at 1358 nm, 1409 nm and 1452 nm, respectively.
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Figure 8.
(a) The simulated and measured SC from the fluorotellurite fiber with the ZDW of 1452 nm and the peak pump power of 387 W. (b) RF spectrum from the generated 1310 nm dispersion wave in the fluorotellurite fiber (RBW=200 kHz and VBW=50 kHz).
