Frequency comb with 100  GHz spacing generated by an asymmetric MQW passively mode-locked laser

Abstract

A coherent frequency comb with a 100 GHz frequency spacing, −3 dB bandwidth of 8.05 nm and pulse width of 440 fs, was generated using an asymmetric multiple quantum well mode locked laser.

Quantum dot fourth-harmonic colliding pulse mode-locked laser for high-power optical comb generation

“…Especially for photonic integrated circuits (PICs), highly efficient multiwavelength light source can effectively reduce power consumption, device size and cost compared to the traditional momo-wavelength distributed feedback laser (DFB) arrays, which enables the capability of large bandwidth, low latency chip-to-chip optical I/O for artificial intelligence (AI) and machine learning (ML) [3][4][5]. Over the past few decades, researchers have proposed several methods for generating OFC, such as electro-optic modulation [6,7], Kerr microresonators [8][9][10] and mode-locked lasers (MLLs) [11][12][13][14][15][16][17][18]. In general, semiconductor mode-locked lasers (SMLLs) have great advantages in large-scale PICs due to its properties of small dimensions and high conversion efficiency [19].…”

“…SMLLs have been extensively studied for producing optical pulses with a wide range of repetition rates from megahertz to hundreds of gigahertz primarily by changing the length of the laser cavity. Typically, two-section MLLs which have a saturable absorber (SA) at the end of the cavity can provide repetition rate of 100 GHz at most, as the cavity length is already very short, which significantly limit the optical gain [13,14,20]. For high speed modulation WDM systems, repetition rate beyond 100 GHz is required to avoid modulation induced crosstalk.…”

Experimental Investigation on Wideband Optical Frequency Comb Generation Based on a Gain-Switched 1550 nm Multi-Transverse Mode Vertical-Cavity Surface-Emitting Laser Subject to Dual Optical Injection

“…An OFC is an optical spectrum composed of a series of equispaced discrete spectral lines [9]. Various methods for generating OFC have been reported such as mode-locking lasers (MLLs) [10], [11], micro-ring resonators [12], [13], electro-optic modulators (EOMs) [14]- [16], and gain-switched lasers [17], [18]. Each one has its own unique virtues and some room for improvement.…”