Cross-Phase Modulation Based Ultra-Flat 90-Line Optical Frequency Comb Generation

Abstract

This paper proposed an approach to design an evenly spaced, 1.8 THz spectrally broad and 1.6 dB flat optical frequency comb (OFC) by exploiting the cross-phase modulation in highly nonlinear fiber. The OFC is realized by controlling the phase of the signals in two parallelly placed highly nonlinear fibers. The frequency and line spacing of the OFC can be tuned by simply varying the periodicity and central wavelength of input electrical and optical signal, respectively.

Optical Frequency Comb Generator Employing Serially Connected LiNbO3 Mach-Zehnder Modulator

“…The optical comb lines are limited up to few MHz to 1 GHz range [20] due to long laser cavity in MLL. Optical filters are beneficial to increase the line spacing of these frequency lines [21]. MLL requires complex and exact phase locking for generation of optical frequency comb rendering the system unsuitable for variety of communication applications.…”