Up to 15 dB improvement in second harmonic distortion in complex-coupled DFB semiconductor lasers

1993 ◽  
Vol 29 (22) ◽  
pp. 1954 ◽  
Author(s):  
D. Novak ◽  
A.J. Lowery
Keyword(s):  
Semiconductor Lasers ◽  
Second Harmonic ◽  
Harmonic Distortion

Broadband Reduction of the Second Harmonic Distortion During Nonlinear Ultrasound Wave Propagation

2010 ◽  
Vol 36 (10) ◽  
pp. 1568-1580 ◽  
Author(s):  
Mirza Pasovic ◽  
Mike Danilouchkine ◽  
Guillaume Matte ◽  
Antonius F.W. van der Steen ◽  
Olivier Basset ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Second Harmonic ◽  
Harmonic Distortion ◽  
Ultrasound Wave ◽  
Nonlinear Ultrasound

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.

Effect of Modulation Source Properties upon Signal-To-Noise Ratios of Inelastic Electron Tunneling Spectra

1986 ◽  
Vol 40 (8) ◽  
pp. 1180-1183 ◽  
Author(s):  
F. A. Dethomas ◽  
Cecil Dybowski ◽  
Harvey S. Gold
Keyword(s):  
Electron Tunneling ◽  
Second Harmonic ◽  
Signal To Noise Ratio ◽  
Harmonic Distortion ◽  
Inelastic Electron ◽  
Signal To Noise ◽  
Noise Ratio ◽  
Inelastic Electron Tunneling ◽  
Electron Tunneling Spectroscopy ◽  
Lock In

Lock-in amplification using ac modulation and second-harmonic detection is routinely employed in such techniques as ac polarography, ac voltammetry, and inelastic electron tunneling spectroscopy (IETS). Properties of the modulation source are shown in the present IET studies to limit the obtainable signal-to-noise ratio of a spectrum. A single inelastic electron tunneling junction is used to demonstrate the effect of various commercial modulation sources on the IET spectrum of benzoic acid on alumina. With all other parameters being held constant, the signal-to-noise ratio of the IET spectrum is found to be inversely correlated with the total harmonic distortion of the modulation source.

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.

Sign in / Sign up

Export Citation Format

Share Document