I. Introduction
An optical frequency comb (OFC) is a multi-wavelength source that consists of a sequence of discrete, equally spaced spectral lines. With its development, OFC has exhibited tremendous potential in applications like spectroscopy, optical communication, optical metrology, sensing, and more [1]–[4], [16]–[18]. A number of methods have demonstrated the generation of OFC, including mode-locking in laser (MLL), periodic modulation of continuous wave (CW) laser, and by utilizing nonlinear processes in various optical mediums [5]–[8]. In the past few decades, OFC generation using MLL and electro-optic modulation (EOM) of CW laser has undergone rigorous developments [9], [19]. However, in MLL based OFCs tunability of line spacing and comb flatness are the major limitations [5]. Whereas, in EOM-based OFCs, which exhibits better tunability than MLL, requires a cascade of modulators with substantial RF power to achieve wideband flat optical comb [10]. This increases the cost as well as the complexity of the process.