Influence of gain nonlinearity on the second order harmonic distortion in semiconductor lasers

2004 ◽  
Author(s):  
V.V. Lysak ◽  
R. Schatz ◽  
A.V. Shulika ◽  
I.A. Sukhoivanov
Keyword(s):  
Semiconductor Lasers ◽  
Harmonic Distortion ◽  
Second Order

scholarly journals Modeling of Millimeter-Wave Modulation Characteristics of Semiconductor Lasers under Strong Optical Feedback

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Ahmed Bakry
Keyword(s):  
Semiconductor Lasers ◽  
Continuous Wave ◽  
Dynamic Range ◽  
Optical Feedback ◽  
Harmonic Distortion ◽  
Wave Band ◽  
Third Order ◽  
Signal Characteristics ◽  
Simulated Time ◽  
Photon Resonance

This paper presents modeling and simulation on the characteristics of semiconductor laser modulated within a strong optical feedback (OFB-)induced photon-photon resonance over a passband of millimeter (mm) frequencies. Continuous wave (CW) operation of the laser under strong OFB is required to achieve the photon-photon resonance in the mm-wave band. The simulated time-domain characteristics of modulation include the waveforms of the intensity and frequency chirp as well as the associated distortions of the modulated mm-wave signal. The frequency domain characteristics include the intensity modulation (IM) and frequency modulation (FM) responses in addition to the associated relative intensity noise (RIN). The signal characteristics under modulations with both single and two mm-frequencies are considered. The harmonic distortion and the third order intermodulation distortion (IMD3) are examined and the spurious free dynamic range (SFDR) is calculated.

scholarly journals Higher Control Scheme Using Neural Second Order Sliding Mode and ANFIS-SVM strategy for a DFIG-Based Wind Turbine

2019 ◽  
Vol 8 (2) ◽  
pp. 17
Author(s):  
Habib Benbouhenni ◽  
Zinelaabidine Boudjema ◽  
Abdelkader Belaidi
Keyword(s):  
Wind Turbine ◽  
Fuzzy Inference ◽  
Hybrid Control ◽  
Sliding Mode ◽  
Harmonic Distortion ◽  
Second Order ◽  
Inference System ◽  
Wind Turbine System ◽  
Control Scheme ◽  
Second Order Sliding Mode

In this paper, we propose an advanced control scheme using neural second order sliding mode (NSOSMC) and adaptive neuro-fuzzy inference system space vector modulation (ANFIS-SVM) strategy for a doubly fed induction generator (DFIG) integrated into a wind turbine system (WTS). The used hybrid control system composed of artificial intelligence techniques and second-order sliding mode applied to ensure better powers performances provided by the WTS. The obtained simulation results showed that the proposed control structure has active and reactive powers with low ripples and low stator current harmonic distortion.

scholarly journals Influence of Fiber Properties on Harmonic and Intermodulation Distortions of Semiconductor Lasers

2021 ◽  
pp. 56-67
Author(s):  
Moustafa Ahmed ◽  
Yas Al-Hadeethi ◽  
Ghodran Alghamdi
Keyword(s):  
Optical Fiber ◽  
Semiconductor Lasers ◽  
Modulation Depth ◽  
Chromatic Dispersion ◽  
Harmonic Distortion ◽  
Intermodulation Distortion ◽  
Signal Distortion ◽  
Laser Signal ◽  
Fiber Link ◽  
Intermodulation Distortions

This paper introduces modeling and simulation of the harmonic and intermodulation distortions of semiconductor laser radiating an optical fiber link. The study is based on the rate equation model of semiconductor lasers excited by injection current with two sinusoidal tones separated by a radio frequency. The modulated laser signal is modeled in both the time and frequency domains. The laser signal distortions include the 2nd and 3rd harmonic distortion (2HD and 3HD), and the third-order intermodulation distortion IMD3. The laser is assumed to be modulated around its relaxation frequency. Influence of the modulation depth on the signal distortion is investigated when the laser is free running and when it is radiating a fiber link. In the latter case, influences of the attenuation and chromatic dispersion on the signal dispersion are elucidated when the fiber length increases up to 10 km. The results show that the fiber attenuation does not affect the signal distortion, whereas the chromatic dispersion affects both the harmonic distortions and intermodulation distortion. Sending the laser signal down an optical fiber of length ~ 5km can help in minimizing 2HD which is the dominant harmonic distortion of the modulated signal. This range of optical fiber is also characterized with intermodulation distortion less than 0dBc.

A Column-Row-Parallel Ultrasound Imaging Architecture for 3-D Plane-Wave Imaging and Tx Second-Order Harmonic Distortion Reduction

2018 ◽  
Vol 65 (5) ◽  
pp. 828-843 ◽  
Author(s):  
Kailiang Chen ◽  
Byung Chul Lee ◽  
Kai E. Thomenius ◽  
Butrus T. Khuri-Yakub ◽  
Hae-Seung Lee ◽  
...  
Keyword(s):  
Plane Wave ◽  
Ultrasound Imaging ◽  
Harmonic Distortion ◽  
Second Order ◽  
Wave Imaging ◽  
Distortion Reduction
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