Optical Frequency Comb Generation by using Higher Order Susceptibility in SOA

In this paper, an optical frequency comb (OFC) generator using higher order susceptibility in SOA has been proposed. The spectrum of OFC contains 40 comb lines and 3-dB power deviation. This broad spectrum is achieved by cascading LiNbO3 Mach-Zehnder Modulator in series followed by electro absorption modulator (EAM). The DC bias and amplitude of RF signal is adjusted to get broadness as well as flatness in OFC generation. The method is simple to achieve the desired characteristics of optical spectrum. Different parameters of semiconductor optical amplifier (SOA) such as injection current as well as carrier density are confined to get broadness in spectrum. For various uses in optical communications and radio frequency photonics, the creation of high repetition rate optical frequency combs with an incredibly wide coherent spectrum is crucial. The generated optical frequency comb can be applicable to act as multi-channel source in communication system.