In-Depth Analysis of the Characteristics of Optical Frequency Comb Generators
Optical frequency combs (OFCs) are in high demand in many different industry fields due to their high precision and are expected to be in high demand for future optical communication systems such as next generation mobile communications because of their high flexibility and scalability. The quality of the optical frequency combs depends on how flat the optical spectrum is (a comb is considered flat if it has low power variation between the comb lines). Generally, we desire a flat frequency comb because if the comb is used as a multiwavelength source, we would want equal power for different wavelengths. In addition, for time domain applications where short pulses are important, high comb line variations could lead to a worse pulse quality. In optical communication systems, OFCs found applications in fiber optics systems. Frequency comb generators are a prime candidate for this system because an OFC with the appropriate frequency spacing can be used to replace individual laser line sources which reduces the price and size of the wavelength-division multiplexing (WDM) system. In this research, we propose to explore the parameters and characteristics of the optical frequency comb generator to reach a flatter optical frequency comb spectrum. We also intend to analytically explain how to achieve the electric field spectrum, and how to generate ultra-flat combs. Additionally, we simulated various parameters that can impact the output of the spectrum via the OptiSystem simulation software to confirm our theoretical analysis.