High side-mode suppression ratio with a Vernier effect single-mode laser using triple coupled microrings

Abstract

The development of single-mode lasers with a high side-mode suppression ratio (SMSR) is challenging but highly desirable for integrated photonics devices and long-distance communications due to their high spectral purity and stability. Here, we demonstrate a single-mode laser with a high side-mode suppression ratio based on size-mismatched triple-coupled microrings. With the exact engineering of several key parameters of the structure like air gap and radii of microrings for controlling the free spectral range (FSR), a predominant mode is selected to lase in amplified spontaneous emission (ASE) of the gain material and all side and high order modes are suppressed by Vernier effect. In this work, we show that a single-mode operation is efficiently generated with an improved side-mode suppression ratio of over 20 dB in a three-ring-coupled microcavity laser. The single-frequency output persists for a wide power range. The theoretical calculations and numerical simulations’ results confirm the validity of the experimental results. Our structural engineering creates new opportunities in a variety of frontier applications in single-mode lasers and high-quality sensors.

Single-Mode Control and Individual Nanoparticle Detection in the Ultraviolet Region Based on Boron Nitride Microdisk with Whispering Gallery Mode

“…For the WGM present in the cascade system, the intensity and Q factor of the mode decreased, compared to a single microdisk cavity, which was due to the increased optical path of multiple cavities. The Vernier effect suppressed all side modes and high-order modes and retained the master mode, which illustrated a guiding significance for improving spectral purity and stability, and realizing the development of a high side-mode suppression ratio (SMSR) single-mode [ 36 ].…”

Efficient Multilayer Near-Infrared Microbottle Laser Pumped by a 532 nm Nanosecond Laser

“…Organic dyes such as Rhodamine B (RhB) are commonly used in cavity lasers due to their broad absorption spectra, high gain, and compatibility with available pump wavelengths such as 532 nm. However, dyes such as methylene blue, oxazine, and Nile-Blue (NB) cannot be used with blue and green pump lights [10] [11]. Combining or coating these dyes in three layers can achieve laser emission in near-infrared wavelengths through energy transfer [12].…”

High resolution frequency shift measurement based on the time domain mode-locked optoelectronic oscillator

“…Recently, the time domain mode-locked OEO (TDML-OEO) is put forward to generate multimode oscillations and at the same time contributes to the circulate oscillation modulation [12][13][14][15][16]. Different structures to lower the sidemode suppressions have also been proposed and discussed [17][18][19][20]. In the previous work, investigations of the TDML-OEO mainly focus on the generation of the frequency, bandwidth and signal quality of the frequency combs.…”