- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Dynamics of pulse amplification in tapered-waveguide quantum-dot semiconductor optical amplifiers
摘要： Tapered-waveguide quantum dot semiconductor optical amplifiers (TW-QDSOAs) have been modeled using numerical calculation of the rate and propagation equations in this article and the amplification characteristics and dynamics of pulse propagation in non-tapered QDSOA, linear, and exponential TW-QDSOA structures have been studied and compared in detail. It has been found that TW-QDSOAs apply less distortion to the amplified pulse and have greater optical gain than non-tapered QDSOA. In TW-QDSOAs, the amplified pulse becomes much less broadening and this amount is negligible, therefore the pulse bit rate can be increased. While the amplified pulse in a non-tapered QDSOA is much broadening than the TW-QDSOAs. The carrier density distribution and dependency of the amplifier gain to the output energy for both non-tapered and tapered structures have been studied. The carrier density and gain in non-tapered QDSOA decreases more than TW-QDSOAs, indicating that the tapered amplifiers are saturated at higher input energies. Our obtained results agree well with those previously obtained for conventional tapered amplifiers.
关键词： Quantum dot semiconductor optical amplifier,tapered QDSOA,gain saturation
更新于2025-09-23 15:19:57
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Research on the Gain Saturation Induced Noise in an Optical Fiber Sensing System
摘要： In an optical fiber sensing time division multiplexing (TDM) system, when the optical pulse with high peak power and low repetition rates is boost amplified, it is prone to be gain saturation and pulse distortion. The paper analysed their effects on the intensity and phase noises, and the results show that the pulse distortion induced noise is mainly down-converted relative intensity noise (RIN) lines spectra caused by the gain jitter. Then the RIN lines are converted into corresponding phase noise lines by the interferometer, which finally cause false signals in the sensor system. However in the case of saturated gain and pulse distortion, the increase of noise background is insignificant. Basing on the above results, several noise suppression schemes have been proposed, which will provide guidance for the design of large-scale remote sensing systems in the future.
关键词： Pulse distortion,Gain saturation,Relative intensity noise,Phase noise,Optical fiber sensor
更新于2025-09-16 10:30:52