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We report an 8-channel wavelength-mode optical pulse interleaver on a silicon photonic chip.Wavelength-and mode-division multiplexing techniques are combined to increase the repetition rate of the pulses without adding the complexity of a single dimension.The interleaver uses a cascaded Mach–Zehnder interferometer architecture as a wavelength-division(de)multiplexer,an asymmetric directional coupler as a mode(de)multiplexer,and various lengths of silicon waveguides as delay lines.A pulse sequence with a time interval of 125 ps is implemented with the repetition rate being eight times that of the initial one.The demonstrated wavelength-mode multiplexing approach opens a new route for the generation of high-speed optical pulses. 相似文献
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由稳态时粒子数和电流连续性主带电粒子的能量平衡方程,建立了α型平板RF放电等离子体的理论模型,并用数值方法求得射频放电等离子体中粒子数密度、电场、功率密度、激发效率的空间分布,解释了RF放电的辉纹结构,分析了放电参数对放电特性的影响。 相似文献
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A tunable Fabry-Perot (F-P) filter by using electro-optic polymer film is proposed. The electro-optic polymer is alkoxysilane dye (ASD)/SiO2-TiO2 hybrid material, whose electro-optic coefficient γ33 is about 5 pm/V. The wavelength tuning range of 3.8 nm under 400-V DC voltage and the nonlinear characteristic with the electric field have been obtained via electro-optical properties of polymer. Both of polymer film fabrication and F-P filter design have been introduced. The tunable F-P filter is designed for the application of two-input/two-output port wavelength-selective optical switch. Also, some problems have been discussed in this letter. 相似文献
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We propose a radio frequency(RF)transfer technique with passive phase noise compensation over a fiber-optic ring.By adopting different frequencies and same wavelength transmission and double sideband(DSB)with carrier suppression(DSBCS)modulation,the impact of backscattering can be effectively suppressed.A stable RF signal can be obtained via frequency mixing at an arbitrary access site along the fiber-optic ring.As the two directional transmissions adopt the same fiber and same wavelength from the same laser,the bidirectional propagation symmetry can be maximally guaranteed.We experimentally demonstrate 2 GHz RF signal transfer along a 100 km standard single-mode fiber-optic ring. 相似文献
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在长距离光纤时间传递链路中,为了避免使用中继放大导致双向传输时延不对称以及引入附加的噪声,提出一种基于单光子探测的长距离光纤时间传递方案。将经过主端(从端) 1 pulse/s时间信号控制的激光脉冲序列作为发送信号,利用从端(主端)具有极高探测灵敏度的单光子探测器接收到达信号,并基于双向时分复用同纤同波时间比对方案得到双向光纤链路传输时延变化,进而根据时间相关单光子计数和高斯拟合的数据处理方式得到两端之间钟差的时间稳定度。为了实现单光子探测器在门控模式下对长距离光纤实验系统的长期测试,设计并实现了外部触发门控工作方式下动态调整的触发控制系统。通过利用光纤链路传输时延变化量,实现对门控触发信号的控制。350 km单模光纤和对应长度的色散补偿光纤(链路总损耗约为100 dB)的时间传递系统实验结果表明,时间传递稳定度优于1.5 ps@1 s和0.4 ps@8192 s。所提方法为长距离高精度光纤时间传递提供了一种有效的解决方案。 相似文献
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With the rapid development of optical communicationwideband optical amplifier has always been the topic ointensive study. Optical parametric amplifier (OPA) is apotential candidate for future optical amplification dueto its wide bandwidth outside the erbium-doped fibeamplifier (EDFA) amplification bandwidth[1]. Parametric amplification is based on four-wave-mixing (FWMphenomenon and is polarization-dependent if it is nocarefully configured. If the signal and the pumps do noshare the same s… 相似文献