Simple optical frequency comb generation using a passively mode-locked quantum dot laser

Development of frequency comb generation by spectral broadening of periodic optical pulses in semiconductor laser amplifiers

“…Equally spaced ultra-wide and ultra-flat optical frequency comb may be a favorable candidate for compactness, stability, complexity, and low power consumption to design these transmitters [3,4]. Femtosecond mode-locked laser (MLL) such as Ti:Sapphire and fiber MLL [1][2][3][4][5][6][7], periodic optical pulse compression using electro-optic modulator [8][9][10][11][12][13] and second harmonics generation by the exploitation of Kerr's nonlinearity in the nonlinear optical medium [14][15][16][17][18][19][20][21] are some of the effective techniques to realize optical frequency comb.…”

“…The MLL produces a periodic optical pulse train of ultrashort duration with the typical period ranging from 10 fs to a few picoseconds, which results in an optical frequency comb [6,7]. The line spacing of the MLL based optical frequency comb is defined by the periodicity of optical ultrashort pulses, which depends on the laser cavity's length.…”

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].…”

“…The cavity dependency over environmental conditions makes the system unstable. The compression of optical signals can generate the tunable and stable OFC by controlling the RF signal parameters applied to the multiple parallelly or serially connected electro-optic modulators [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Chen et al [16] proposed a single polarization modulation based seven-line OFC and achieve the flatness of 1.47 dB.…”

“…Yamamoto et al [6] proposed an 11-line frequency comb with 1.9 dB spectrum flatness by the proper adjustment in the phase of the sinusoidal signal and DC biased signal applied to the upper and lower branch of dual-drive Mach-Zehnder modulator (MZM). Similarly, Jassim et al [17] and Li et al [18] has used the same approach based on the biasing of MZM and generate the frequency comb with 27 and 80 comb lines with 1 dB and 10 dB spectrum flatness, respectively. Bo et al [19] cascaded the multiple MZM modulator with a similar biasing approach and generated the frequency comb of 9, 45 and 47 frequency lines with 0.8 dB, 1 dB, and 1.9 dB.…”