Subring-wavelength multidimensional multiplexing for quad-comb generation from an integrated dual-ring mode-locked laser

2021 ◽  
Author(s):  
Hao Sun ◽  
Haisu Lv ◽  
Jinxuan Wu ◽  
Pengcheng Hu ◽  
Haijin Fu ◽  
...  
Keyword(s):  
Ring Mode ◽  
Mode Locked Laser ◽  
Comb Generation ◽  
Dual Ring

scholarly journals A Multidimensional Multiplexing Mode-Locked Laser Based on a Dual-Ring Integrative Structure for Tri-Comb Generation

2020 ◽  
Vol 10 (22) ◽  
pp. 8260
Author(s):  
Ruitao Yang ◽  
Hao Sun ◽  
Haisu Lv ◽  
Jian Xu ◽  
Jinxuan Wu ◽  
...  
Keyword(s):  
Operation Mode ◽  
Dispersion Analysis ◽  
Heterodyne Detection ◽  
Laser Ranging ◽  
Pulse Trains ◽  
Wavelength Multiplexing ◽  
Mode Locked Laser ◽  
Comb Generation ◽  
Single Cavity ◽  
Dual Ring

The tri-comb-based multi-heterodyne detection technique has been proven to be a powerful tool for precision metrology, e.g., laser ranging and spectroscopy. However, in existing tri-comb generation methods, it is difficult to provide a large and variable difference in tri-comb repetition rates. In this paper; we propose a multidimensional multiplexing mode-locked laser based on a dual-ring integrative structure. Combining the dimensions of sub-ring multiplexing and wavelength multiplexing, two modes of tri-comb generation can be achieved with the dual-ring single cavity laser. The generated combs are identified based on the relative intensity of the pulse trains and optical spectrum, and the repetition rates of dual-combs from the same sub-ring are distinguished based on dispersion analysis. With repetition rates of approximately 47 MHz and 49.6 MHz, the minimum and maximum repetition rate difference of the generated tri-comb can be changed from 2.38 kHz and 2.59526 MHz to 2.74 kHz and 2.59720 MHz merely by switching the operation mode of the dual-ring integrated mode-locked laser. The obtained results indicate that our method can offer a powerful scheme for future multi-comb generation and its application in multi-heterodyne detection-based laser ranging and spectroscopy.

Topological Flow Structures of Annular Swirling Jets

2001 ◽  
Vol 17 (3) ◽  
pp. 131-138
Author(s):  
Feng Chin Tsai ◽  
Rong Fung Huang
Keyword(s):  
Vortex Breakdown ◽  
Swirling Flow ◽  
Single Bubble ◽  
Flow Structures ◽  
Complex Flow ◽  
Swirl Number ◽  
Recirculation Bubble ◽  
Annular Jet ◽  
Ring Mode ◽  
Dual Ring

AbstractThe effects of blockage and swirl on the macro flow structures of the annular jet past a circular disc are experimentally studied through the time-averaged streamline patterns. In the blockage-effect regime, the flows present multiple modes, single bubble, dual rings, vortex breakdown, and triple rings, in different regimes of blockage ratio and swirl number. The topological models of the flow structures are proposed and discussed according to the measured flow fields to manifest the complex flow structures. The single bubble is a closed recirculation bubble with a stagnation point on the central axis. The dual-ring flow is an open-top recirculsation zone, in which a pair of counter-rotating vortex rings exists in the near wake. The fluids in the dual rings are expelled downstream through a central jet-like swirling flow. A vortex breakdown may occur in the central jet-like swirling flow if the exit swirl number exceeds critical values. When the vortex breakdown interacts with the dual rings, a complex triple-ring flow structure forms. Axial distributions of the local swirl number are presented and discussed. The local swirl number increases with the increase of the exit swirl number and attains the maximum in the dual-ring mode. At large exit swirl numbers where the vortex breakdown occurs, the local swirl number decreases drastically to a low value.

Tri-Comb and Quad-Comb Generation Based on a Multi-Dimensional Multiplexed Mode-Locked Laser

2019 ◽  
Vol 37 (20) ◽  
pp. 5178-5184 ◽  
Author(s):  
Ting Li ◽  
Xin Zhao ◽  
Jie Chen ◽  
Qian Li ◽  
Shuguo Xie ◽  
...  
Keyword(s):  
Mode Locked Laser ◽  
Comb Generation

Dual-comb generation from a dual-ring hybrid mode-locked fiber laser

2019 ◽  
Author(s):  
Ruitao Yang ◽  
Hao Sun ◽  
Jiahao Guo ◽  
Haijin Fu ◽  
Hongxing Yang ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Hybrid Mode ◽  
Comb Generation ◽  
Dual Ring

RIE lag directional coupler based integrated InGaAsP/InP ring mode-locked laser

2011 ◽  
Author(s):  
John S. Parker ◽  
Pietro R.A. Binetti ◽  
Yung-Jr Hung ◽  
Erik J. Norberg ◽  
Larry A. Coldren
Keyword(s):  
Directional Coupler ◽  
Ring Mode ◽  
Mode Locked Laser

scholarly journals Integrated Microwave Photonic Isolators: Theory, Experimental Realization and Application in a Unidirectional Ring Mode-Locked Laser Diode

Photonics ◽  
2015 ◽  
Vol 2 (3) ◽  
pp. 957-968 ◽  
Author(s):  
Martijn Heck ◽  
Sudharsanan Srinivasan ◽  
Michael Davenport ◽  
John Bowers
Keyword(s):  
Laser Diode ◽  
Experimental Realization ◽  
Microwave Photonic ◽  
Ring Mode ◽  
Mode Locked Laser
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