Broadband optical comb generation using Mach-Zehnder-modulator-based flat comb generator with feedback loop

Abstract

We demonstrated broadband comb generation using a Mach-Zehnder-modulator-based flat comb generator with a feedback loop. By constructing the feedback loop, the modulation depth was increased. A generated comb signal was broadened as compared with single-path configuration.

Optical frequency comb generation based on chirping of Mach–Zehnder Modulators

“…Till today, many techniques have been proposed and developed to realize optical frequency combs (OFCs) such as the employment of a mode locked laser (MLL) [7,8]. The instability of carrier frequency due to the environment's dependency of laser cavity is the main disadvantage of MLL method [3]. Another technique is based on nonlinear effects in a highly nonlinear medium [9].…”

“…Nowadays, optical frequency comb generator (OFCG) is widely used as multi-wavelength source for optical communication systems such as dense wavelength-division multiplexing (DWDM), optical time-division multiplexing, and optical orthogonal frequency-division multiplexing systems [1][2][3][4][5][6]. The generated comb is required to provide a stable frequency with a fixed phase and spacing for these applications.…”

Cross-phase modulation based ultra-flat 90-line optical frequency comb generation

“…[12]. Periodic optical ultra-short pulse generation using mode-locked laser (MLL) [13][14], electro-optic modulators [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], Kerr nonlinearity [35][36] and micro-resonators [37][38] are some effective techniques to generate OFC. MLL sources generate periodic pulse train of femto-second pulse width by controlling the cavity parameters [13][14].…”

Optical Frequency Comb Generation Utilizing Mach-Zehnder Modulator and Multi-Laser Sources

“…However, this technique requires a high optical power which generates noise and produces nonstability in the comb signal. Recently, other techniques have been proposed and demonstrated using an MZM with an optical feedback loop [7]. In this paper, we propose a new technique to increase the generated comb lines by using multi-laser sources injected simultaneously into an MZM.…”

“…The preliminary results show the multiplication of the generated comb lines as a function of the number of launched laser sources. Flat comb signals were obtained when the condition given by the equation below is satisfied [7] (Figure 1).…”