Abstract
We compare several schemes for broadband optical frequency comb (OFC) generation based on several nonlinear effects in highly nonlinear fiber (HNLF). Cascaded four wave mixing (CFWM) and self-phase modulation (SPM) processes in HNLF are proved to be effective ways for spectrum broadening. We investigate some parameters affecting the performance of the output OFC in detail. When only CFWM occurs in the HNLF, broadband OFC can be generated with poor power flatness. When only SPM occurs in the HNLF, we obtain a 10 GHz OFC of 103 comb lines within 5-dB power deviation. When both CFWM and SPM simultaneously occur in the HNLF, we obtain a 10 GHz OFC of 143 comb lines within 4.5-dB power deviation. All the OFC generation schemes have the advantages of tunability of central wavelength and repetition frequency.
Highlights
Optical frequency comb (OFC) is a spectrum that consists of a set of evenly spaced frequency components with a coherent and stable phase relationship [1]
The number of available spectral lines obtained in Scheme 1 is experimentally investigated in detail, which is varied as the output pump power of high power erbium-doped fiber amplifier (HP-erbium-doped fiber amplifier (EDFA)), central wavelength of the tunable laser source (TLS) and repetition rate of radio frequency (RF) signal applied on phase modulator (PM) are changed
We have compared several OFC generator (OFCG) schemes based on different nonlinear effects in the highly nonlinear fiber (HNLF)
Summary
Optical frequency comb (OFC) is a spectrum that consists of a set of evenly spaced frequency components with a coherent and stable phase relationship [1]. With the rapid development of optical communication technology, the generation of OFC is attracting lots of interests recently due to its wide applications, such as optical arbitrary waveform generation (OAWG) [2,3,4], multi-wavelength ultra-short pulse generation [5] and dense wavelength division multiplexing (DWDM) [6] In such applications especially for OAWG, the number of comb lines, spectral flatness and optical tone-to-noise ratio (OTNR) represent key considerations. When both CFWM and SPM are employed in the HNLF, we obtain a 10 GHz OFC of 143 comb lines within 4.5-dB power deviation All these OFCG schemes have the advantages of tunability of central wavelength and repetition frequency
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