Sequential generation of self-starting diverse operations in all-fiber laser based on thulium-doped fiber saturable absorber

2021 ◽  
Author(s):  
PEI ZHANG ◽  
KAHARUDIN DIMYATI ◽  
BILAL NIZAMANI ◽  
MUSTAFA M. NAJM ◽  
S. W. HARUN
Keyword(s):  
Fiber Laser ◽  
Saturable Absorber ◽  
Signal To Noise Ratio ◽  
Processing System ◽  
Dark Soliton ◽  
Mode Locking ◽  
Signal Processing System ◽  
Operation Modes ◽  
Q Switching ◽  
Sequential Generation

Abstract Self-starting Q-switching, Q-switched mode-locking and mode-locking operation modes are achieved sequentially in an all-fiber erbium-doped fiber laser with thulium-doped fiber saturable absorber for the first time. The central wavelengths of Q-switching, Q-switched mode-locking and mode-locking operation modes are 1569.7 nm, 1570.9 nm, and 1572 nm, respectively. The mode-locking operation of the proposed fiber laser generates stable dark soliton with a repetition rate of 0.99 MHz and signal-to-noise ratio of 65 dB. The results validate the capability of generating soliton pulse by doped fiber saturable absorber. Furthermore, the proposed fiber laser is beneficial to the applications of optical communication and signal processing system.

Pulsed erbium-doped fiber laser by a few-layer molybdenum disulfide saturable absorber: from Q-switching to mode-locking

2016 ◽  
Vol 55 (8) ◽  
pp. 081308 ◽  
Author(s):  
Zhi-Chao Luo ◽  
Fu-Zao Wang ◽  
Hao Liu ◽  
Meng Liu ◽  
Rui Tang ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Molybdenum Disulfide ◽  
Saturable Absorber ◽  
Mode Locking ◽  
Erbium Doped ◽  
Q Switching

Q-switched mode locking of a fiber laser resonantly pumped Er:YAG ceramic laser at 1645 nm using graphene as saturable absorber

2015 ◽  
Vol 24 (01) ◽  
pp. 1550001 ◽  
Author(s):  
Haitao Huang ◽  
Deyuan Shen ◽  
Jian Zhang ◽  
Dingyuan Tang
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Saturable Absorber ◽  
Average Output Power ◽  
Repetition Rate ◽  
Mode Locking ◽  
Average Output ◽  
Q Switching ◽  
Ceramic Laser ◽  
Switching Mode

A fiber laser resonantly pumped Q-switched mode locked Er :YAG ceramic 1645 nm laser using graphene as the saturable absorber is realized. The mode-locked pulses with average output power of 320 mW, Q-switching envelope temporal width of 10 μs and mode-locking repetition rate of 83 MHz can readily be generated from the laser. To the best of our knowledge, this is the first report on the graphene-based Q-switching mode locked Er :YAG ceramic laser emitting around 1645 nm.

Mode locking and multiwavelength Q-switching in a dumbbell-shaped fiber laser with a gold nanorod saturable absorber

2019 ◽  
Vol 58 (05) ◽  
pp. 1
Author(s):  
Xu-De Wang ◽  
Qin-Mei Liang ◽  
Ai-Ping Luo ◽  
Zhi-Chao Luo ◽  
Meng Liu ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Saturable Absorber ◽  
Mode Locking ◽  
Gold Nanorod ◽  
Q Switching

Tin Telluride Quantum Dots as a Novel Saturable Absorber for Q‐Switching and Mode Locking in Fiber Lasers

2020 ◽  
pp. 2001821
Author(s):  
Safayet Ahmed ◽  
Junpeng Qiao ◽  
Ping Kwong Cheng ◽  
Ahmed Mortuza Saleque ◽  
Mohammad Ismail Hossain ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Saturable Absorber ◽  
Fiber Lasers ◽  
Mode Locking ◽  
Tin Telluride ◽  
Q Switching

A High-Performance Signal Processing System for Monopulse Tracking Radar

2011 ◽  
Vol 383-390 ◽  
pp. 471-475
Author(s):  
Yong Bin Hong ◽  
Cheng Fa Xu ◽  
Mei Guo Gao ◽  
Li Zhi Zhao
Keyword(s):  
Signal Processing ◽  
High Performance ◽  
Dynamic Range ◽  
Signal To Noise Ratio ◽  
Processing System ◽  
Digital Signal ◽  
Radar Signal ◽  
Signal Processing System ◽  
Parallel Pipelined ◽  
Tracking Radar

A radar signal processing system characterizing high instantaneous dynamic range and low system latency is designed based on a specifically developed signal processing platform. Instantaneous dynamic range loss is a critical problem when digital signal processing is performed on fixed-point FPGAs. In this paper, the problem is well resolved by increasing the wordlength according to signal-to-noise ratio (SNR) gain of the algorithms through the data path. The distinctive software structure featuring parallel pipelined processing and “data flow drive” reduces the system latency to one coherent processing interval (CPI), which significantly improves the maximum tracking angular velocity of the monopulse tracking radar. Additionally, some important electronic counter-countermeasures (ECCM) are incorporated into this signal processing system.

Q-SWITCHED THULIUM-DOPED FIBER LASER AT 2 MICRON REGION BY 802 NM PUMPING

2015 ◽  
Vol 74 (8) ◽  
Author(s):  
A. A. Latiff ◽  
M. T. Ahmad ◽  
Z. Zakaria ◽  
H. Ahmad ◽  
S. W. Harun
Keyword(s):  
Carbon Nanotubes ◽  
Pump Power ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Laser Cavity ◽  
Pulse Generation ◽  
Q Switching ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

An 1892.4 nm ultrafast passive Q-switched fiber laser is demonstrated by using Thulium-doped fiber (TDF) in conjunction with a multi-walled carbon nanotubes (MWCNTs) as a saturable absorber (SA). The MWCNTs film is sandwiched between two FC/PC fiber connectors and integrated into the laser cavity with 802 nm pump for Q-switching pulse generation. The pulse repetition rate can be tuned from 3.8 to 4.6 kHz while the corresponding pulse width reduces from 22.1 to 18.4 μs as the pump power is increased from 187.3 to 194.2 mW. A higher performance Q-switched Thulium-doped fiber laser (TDFL) is expected to be achieved with the optimization of the MWCNT-SA saturable absorber and laser cavity.

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