GUAN Xiangshuai,MUHongqian,WANG Muguang.Optical frequency comb with tunable free spectral range based on two Mach-Zehnder modulators cascaded with linearly chirped fiber Bragg grating and phase modulator[J].Optoelectronics Letters,2022,(7):385-389 Optical frequency comb with tunable free spectral range based on two Mach-Zehnder modulators cascaded with linearly chirped fiber Bragg grating and phase modulator Author Name Affiliation GUAN Xiangshuai  Key Laboratory of All Optical Network and Advanced Telecommunication Network, Ministry of Education, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China  MUHongqian  Key Laboratory of All Optical Network and Advanced Telecommunication Network, Ministry of Education, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China  WANG Muguang  Key Laboratory of All Optical Network and Advanced Telecommunication Network, Ministry of Education, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China  Abstract:       An approach for generating optical frequency comb (OFC) with tunable free spectral range (FSR) is proposed. Two Mach-Zehnder modulators (MZMs) driven by phase-shifted sinusoidal signals are cascaded to generate OFC with plentiful comb lines and the FSR controlled by the drive frequency. Subsequently, a linearly chirped fiber Bragg grating (LCFBG) and a phase modulator (PM) are used to increase the comb FSR by a particular integer multiple. Therefore, by simultaneously controlling the drive frequency of MZMs, the dispersion amount of the LCFBG and the drive signal of the PM, an OFC with desired FSR can be achieved. Hits: 280 Download times: 0 View Full Text    Download reader