Modulator for Frequency-Shift Keying of Optical Signals

Frequency-shift-keying (FSK) modulation, a frequency modulation scheme, has been long utilized for data communication applications. This technique represents digital information as changes in the frequency of a carrier wave. However, the need for expansive alphabet FSK modulation becomes prominent when the number of distinct symbols in a given digital communication system significantly increases. Conventional methods have struggled to effectively navigate this extensive-scale FSK modulation. The challenge lies in accurately selecting and transmitting the right subset of tones from a multivariate tone distribution. Traditional techniques struggle with maintaining the accuracy and efficiency of FSK modulation when handling a multitude of tones, clearly indicating the need for a refreshed technology approach.

Technology Description

This technology consists of a frequency-shift-keying (FSK) modulator and a method designed for extensive alphabet FSK modulation. Its operations are centered on the filtering process of a multitone optical source like a mode-locked laser, which provides a comb distribution of tones. The frequency-selective components, such as a Mach-Zehnder interferometer filter or microring resonator filter, select a subset of tones for transmission. What makes this technology stand out is its ability to facilitate multiple frequency-selective components depending on the number of tones provided by the multitone optical source. This unique feature ensures effective modulating of complex FSK systems. It eventually results in an optical signal that includes only a single tone correlating with the symbol intended for transmission, thereby bolstering the efficiency and reliability of FSK modulation.