Abstract
We designed a tellurite microstructure fiber (TMF) and proposed a broadband optical frequency comb generation scheme that was based on electro-optical modulation and cascaded sign-alternated dispersion TMF (CSAD-TMF). In addition, the influence of different nonlinear effects, the ultrashort pulse evolution in the CSAD-TMF with the anomalous dispersion (AD) zones and the normal dispersion (ND) zones were analyzed based on the generalized nonlinear Schrodinger equations (GNLSE) modelling. According to the simulations, when the input seed comb had a repetition rate of 20 GHz and had an input pulse peak power of 30 W, the generation scheme could generate optical frequency combs with a 6 dB spectral bandwidth spanning over 170 nm centered at 1550 nm. Furthermore, the generated combs showed good coherence in performance over the whole 6 dB spectral bandwidth. The highly coherent optical frequency combs can be used as high-repetition-rate, multi-wavelength light sources for various integrated microwave photonics and ultrafast optical signal processing applications.
Highlights
The optical frequency comb (OFC) refers to a series of discrete, spaced frequency components, which covers a variety of applications such as optical frequency metrology, laser ranging, and astronomical spectrograph calibration [1,2,3]
The electro-optic frequency comb can be generated by various methods, including the use of a dual-drive Mach–Zehnder modulator (MZM) [15], cascading intensity modulators (IM), phase modulators (PM) [16], time-to-frequency mapping [17], and so on, in which the comb lines number and bandwidth coverage are limited by the modulator’s bandwidth and the performance of the RF source
A non-coherent broad seed comb was generated by using a single MZM, an OFC of 55 frequency lines with 3 dB flatness was obtained via four-wave mixing in 400 m of highly nonlinear fiber (HNLF) [18]
Summary
The optical frequency comb (OFC) refers to a series of discrete, spaced frequency components, which covers a variety of applications such as optical frequency metrology, laser ranging, and astronomical spectrograph calibration [1,2,3]. Several schemes have been demonstrated to generate OFCs, including a mode-locked laser [4,5], an electro-optic frequency comb [6,7,8], and a Kerr comb [9,10]. A non-coherent broad seed comb was generated by using a single MZM, an OFC of 55 frequency lines with 3 dB flatness was obtained via four-wave mixing in 400 m of HNLF [18]. Most of the alternated dispersion, the stagnation of spectral broadening can be eliminated, and the current schemes rely on silica highly nonlinear fiber (SHNLF) [6,15,20], in which the inrequired power can be significantly reduced [19].
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