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Microwave Modulation Of A Quantum-Well Laser With And Without External Optical Injection, Xiaomin Jin, Shun-Lien Chuang
Microwave Modulation Of A Quantum-Well Laser With And Without External Optical Injection, Xiaomin Jin, Shun-Lien Chuang
Electrical Engineering
We compare three microwave modulation methods experimentally and theoretically using a semiconductor quantum-well (QW) Fabry–Perot test laser: 1) direct microwave current modulation of the test laser (electrical modulation); 2) optical modulation by an external single-wavelength pump laser with a modulated optical injection power; and 3) electrical modulation of the test laser that is injection locked by an external single-wavelength pump laser with a constant injection power. This is the first direct comparison of the three modulation methods on the same QW laser, to the best of our knowledge. The bandwidth of optical absorption modulation is 7.7 GHz, which is 1.45 …
Measurement Of Linewidth Enhancement Factor Of Semiconductor Lasers Using An Injection-Locking Technique, G. Liu, Xiaomin Jin, Shun-Lien Chuang
Measurement Of Linewidth Enhancement Factor Of Semiconductor Lasers Using An Injection-Locking Technique, G. Liu, Xiaomin Jin, Shun-Lien Chuang
Electrical Engineering
A new method for measuring the linewidth enhancement factor of semiconductor lasers using the injection-locking technique is presented. This idea is based on the relation between the upper and lower bounds of the locked and unlocked regimes when the detuning of the pump and slave laser is plotted as a function of the injection power. Our results are confirmed with an independent measurement using amplified spontaneous emission (ASE) spectroscopy as well as our theory, which takes account of the realistic quantum-well (QW) band structure and many-body effects. This method provides a new approach to measure the linewidth enhancement factor above …