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ABSTRACT* This paper describes the frequency comb generation in a parametric mixer based on a section of highly nonlinear fiber (HNLF), and spectral linewidth characteristics of the generated parametric comb lines are investigated for the first time. In the experiments, the parametric mixer is driven by electro-optical modulated continuous-wave, and combs with about 40 lines are obtained. The linewidth of the tones with different orders is measured. The results show that the parametric comb lines are characterized with spectral linewidth preservation.