scholarly journals Application of Dual-Frequency Self-Injection Locked DFB Laser for Brillouin Optical Time Domain Analysis

Sensors ◽  
2021 ◽  
Vol 21 (20) ◽  
pp. 6859
Author(s):  
Cesar A. Lopez-Mercado ◽  
Dmitry A. Korobko ◽  
Igor O. Zolotovskii ◽  
Andrei A. Fotiadi
Keyword(s):  
Semiconductor Lasers ◽  
Low Cost ◽  
Time Domain Analysis ◽  
Injection Locking ◽  
Laser Source ◽  
Dual Frequency ◽  
Dfb Laser ◽  
Frequency Laser ◽  
Optical Time ◽  
Electrooptical Modulator

Self-injection locking to an external fiber cavity is an efficient technique enabling drastic linewidth narrowing of semiconductor lasers. Recently, we constructed a simple dual-frequency laser source that employs self-injection locking of a DFB laser in the external ring fiber cavity and Brillouin lasing in the same cavity. The laser performance characteristics are on the level of the laser modules commonly used with BOTDA. The use of a laser source operating two frequencies strongly locked through the Brillouin resonance simplifies the BOTDA system, avoiding the use of a broadband electrooptical modulator (EOM) and high-frequency electronics. Here, in a direct comparison with the commercial BOTDA, we explore the capacity of our low-cost solution for BOTDA sensing, demonstrating distributed measurements of the Brillouin frequency shift in a 10 km sensing fiber with a 1.5 m spatial resolution.

scholarly journals Dual-frequency laser comprising a single fiber ring cavity for self-injection locking of DFB laser diode and Brillouin lasing

2020 ◽  
Vol 28 (25) ◽  
pp. 37322
Author(s):  
Vasily V. Spirin ◽  
José L. Bueno Escobedo ◽  
Dmitry A. Korobko ◽  
Patrice Mégret ◽  
Andrei A. Fotiadi
Keyword(s):  
Laser Diode ◽  
Ring Cavity ◽  
Injection Locking ◽  
Single Fiber ◽  
Dual Frequency ◽  
Fiber Ring ◽  
Dfb Laser ◽  
Frequency Laser

scholarly journals A Directly Modulated Laterally Coupled Distributed Feedback Laser Array Based on SiO2 Planarization Process

2020 ◽  
Vol 11 (1) ◽  
pp. 221
Author(s):  
Qichao Wang ◽  
Jian Wang ◽  
Changzheng Sun ◽  
Bing Xiong ◽  
Yi Luo ◽  
...  
Keyword(s):  
Semiconductor Lasers ◽  
Communication Networks ◽  
High Speed ◽  
Low Cost ◽  
Single Mode ◽  
Distributed Feedback ◽  
Laser Array ◽  
Fiber Communication ◽  
Dfb Laser ◽  
Planarization Process

Low-cost and high-speed single-mode semiconductor lasers are increasingly required as wide-band access fiber communication expands in recent years. Here, a high-speed laterally coupled distributed feedback (LC-DFB) laser array is achieved based on a SiO2 planarization process. The device exhibits low threshold currents of about 12 mA and high slope efficiencies over 0.26 W/A. Stable single mode operation and high-speed performance are realized with side mode suppression ratios (SMSR) over 45 dB, and 3-dBe bandwidths exceed 14 GHz for all four channels. Such a high-speed and process simple LC-DFB laser array shows great potential to the low-cost fiber communication networks.

Dual-frequency narrowband CW fiber laser implementing self-injection locking of DFB laser diode and Brillouin lasing in a single ring cavity

2021 ◽  
Author(s):  
Vasily V. Spirin ◽  
Jose L. Bueno-Escopedo ◽  
C. A. Lopez-Mercado ◽  
Patrice Mégret ◽  
Dmitry A. Korobko ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Laser Diode ◽  
Ring Cavity ◽  
Injection Locking ◽  
Dual Frequency ◽  
Single Ring ◽  
Dfb Laser

scholarly journals Effects of Ag contents on the microstructure and SERS performance of self-grown Ag nanoparticles/Mo–Ag alloy films

2020 ◽  
Vol 9 (1) ◽  
pp. 751-759 ◽  
Author(s):  
Xinxin Lian ◽  
Yuanjiang Lv ◽  
Haoliang Sun ◽  
David Hui ◽  
Guangxin Wang
Keyword(s):  
Ag Nanoparticles ◽  
Large Scale ◽  
Low Cost ◽  
Film Surface ◽  
Time Domain Analysis ◽  
Alloy Film ◽  
Scale Production ◽  
Alloy Films ◽  
Surface Enhanced Raman ◽  
Ag Film

AbstractAg nanoparticles/Mo–Ag alloy films with different Ag contents were prepared on polyimide by magnetron sputtering. The effects of Ag contents on the microstructure of self-grown Ag nanoparticles/Mo–Ag alloy films were investigated using XRD, FESEM, EDS and TEM. The Ag content plays an important role in the size and number of uniformly distributed Ag nanoparticles spontaneously formed on the Mo–Ag alloy film surface, and the morphology of the self-grown Ag nanoparticles has changed significantly. Additionally, it is worth noting that the Ag nanoparticles/Mo–Ag alloy films covered by a thin Ag film exhibits highly sensitive surface-enhanced Raman scattering (SERS) performance. The electric field distributions were calculated using finite-difference time-domain analysis to further prove that the SERS enhancement of the films is mainly determined by “hot spots” in the interparticle gap between Ag nanoparticles. The detection limit of the Ag film/Ag nanoparticles/Mo–Ag alloy film for Rhodamine 6G probe molecules was 5 × 10−14 mol/L. Therefore, the novel type of the Ag film/Ag nanoparticles/Mo–Ag alloy film can be used as an ideal SERS-active substrate for low-cost and large-scale production.

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