共查询到19条相似文献,搜索用时 96 毫秒
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根据光增益与载流子密度的对数关系,在受激发射速率中分别引入了增益饱和项和载流子复合项,通过适应于多量子阱激光器的速率方程,从理论上证明了短腔结构存在与阈值电流最小值对应的最佳阱数。给出了多量子阱激光器的瞬态呼应特性的直接仿真结果及相图,分析了注入电流、阱数和腔长对其激射阈值、开关延误时间、弛豫振荡频率和光输出等能量的影响。 相似文献
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The resonant enhancement of the small-signal intensity modulation response of a grating-assisted extended-cavity semiconductor laser is shown to occur in dual peaks centred near the harmonics of the cavity resonance fluency. Each response peak is bifurcated into two closely spaced peaks of different amplitudes and bandwidths. The position of the broader of the two peaks depends on the operating power of the laser. A strong discontinuity in the response amplitude is observed near the harmonics of the cavity resonance fluency 相似文献
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The authors describe a new circuit modelling technique for the directly frequency-modulated CSP semiconductor laser. In particular, this model accounts not only for the carrier density but also the temperature effects. Predictions from this model are compared with other published results of sinusoidal frequency modulation in the range DC-3 GHz and show good agreement.<> 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1970,58(10):1457-1465
Methods for direct modulation of semiconductor lasers are reviewed with the objective of indicating the advantages and limitations of each method. Techniques for producing amplitude, pulse, and frequency modulation of the optical wave are included. The modulation capabilities of present pulsed lasers are analyzed with special attention given to their operation at room temperature. In addition, several ways of producing analog position or width modulation of microwave-rate optical pulses are described, and the capabilities of optical frequency modulation by acoustic waves are reviewed. A new way of obtaining mode-locked optical pulses with a semiconductor laser is also suggested. 相似文献
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High-speed modulation of semiconductor lasers 总被引:6,自引:0,他引:6
An overview is given of the direct modulation performance of high-speed semiconductor lasers. The high-speed response characteristics are described using a cascaded two-port model of the laser. This model separates the electrical parasitics from the intrinsic laser and enables these subsections to be considered separately. The presentation concentrates on the small-signal intensity modulation and frequency modulation responses, and the large-signal switching transients and chirping. Device-dependent limitations on high-speed performance are explored and circuit modeling techniques are briefly reviewed. 相似文献
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《Electron Devices, IEEE Transactions on》1985,32(12):2572-2584
An overview is given of the direct modulation performance of high-speed semiconductor lasers, The high-speed response characteristics are described using a cascaded two-port model of the laser. This model separates the electrical parasitics from the intrinsic laser and enables these subsections to be considered separately. The presentation concentrates on the small-signal intensity modulation and frequency modulation responses, and the large-signal switching transients and chirping. Device-dependent limitations on high-speed performance are explored and circuit modeling techniques are briefly reviewed. 相似文献
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Direct modulation of long-cavity semiconductor lasers 总被引:6,自引:0,他引:6
The application of a high-speed signal via the drive current to a long-cavity semiconductor laser (cavity length >~1 cm) differs from the short-cavity case in that the variation of the optical field within one round-trip time is not negligible. We theoretically investigate the modulation response for a semiconductor laser of arbitrary length and relate it to experiments on the multifrequency waveguide grating router laser, a long-cavity laser. We find that the largest modulation bandwidth is achieved by having the modulated amplifier and the desired output as far apart as possible, the modulation bandwidth can be further increased by simple electronic precompensation, and because of fast nonlinearities the broadband intensity modulation of long-cavity lasers exhibits substantially less chirp than short-cavity lasers, the chirp essentially equal to that of the amplifiers. Finally, we demonstrate the direct modulation of three channels simultaneously in a multifrequency laser at 1.24 Gb/s each 相似文献
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Mustafa N. Pesquera L. Cheung C.Y.L. Shore K.A. 《Photonics Technology Letters, IEEE》1999,11(5):527-529
An analysis is performed of the direct-current (dc) amplitude modulation response of unipolar intersubband semiconductor lasers. It is shown that unipolar lasers have the potential for achieving terahertz dc modulation bandwidths 相似文献