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The electric and magnetic energy distributions in photonic crystals (PC) are calculated by using the plane wave expansion (PWE) method. Even though the total electric and magnetic energy in each unit cell of photonic crystals are equal to each other, the ratio of electric and magnetic energy densities varies depending on the local position. Based on Fermi's golden rule, the optical gain is analysed in the full quantum framework that takes the nonuniform energy density ratio into account. This nonuniform energy density ratio in photonic crystals, defined in an equal form as gain modification factor, leads to spatially inhomogeneous modification of optical gain. Results reported in the paper provide a new perspective for analysing gain characteristics, as well as the lasing properties, in photonic crystals. 相似文献
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针对长跨距密集波分复用系统中喇曼放大入纤泵浦功率过大的问题,将遥泵放大器(RP-EDFA)引入到系统中,通过对共纤RP-EDFA的噪音性能及其优化设计的研究,在理论上计算比较了RP-EDFA系统和后向喇曼放大系统在不同泵浦功率水平下的光信噪比和非线性相移,表明遥泵放大技术有效降低了入纤泵浦的功率水平,更适合长跨距应用.运用遥泵放大技术,对一个典型的长跨距系统进行系统Q值的模拟,结果表明:在 220 mW泵浦功率水平下可以实现跨距为 167 km的40×11.6 Gbit/s系统1000 km传输,Q值裕量4.4 dB. 相似文献
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Extending span distance is an important way to reducethe cost of long-haul dense wavelength division multi-plexing (DWDM) systems. In traditional DWDM sys-tems based on erbium-doped fiber amplifiers (EDFAs),span distance is about 80—100 km. Quantum limitationin noise figure (NF) of EDFAs (3 dB) prevents furtherextension of span distance with acceptable costs on trans-mission distance. capacity, and performance. Distributedfiber Raman amplifiers (DFRAs) have been proven tohave better… 相似文献
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Correlated photon pairs at 1.5 μm are generated in a silicon wire waveguide (SWW) with a length of only 1.6 mm. Experimental results show that the single-side count rates on both sides increase quadratically with pump light, indicating that photons are generated from the spontaneous four-wave mixing (SFWM) processes. The quantum correlation property of the generated photons is demonstrated by the ratio between coincident and accidental coincident count rates. The highest ratio measured at room temperature is to be about 19, showing that generated photon pairs have strong quantum correlation property and low noise. What is more, the wavelength correlation property of the coincident count is also measured to demonstrate the correlated photon pair generation. The experimental results demonstrate that SWWs have great potential in on-chip integrated low-noise correlated photon pair sources at 1.5 μm. 相似文献
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The condition of the single fundamental mode (HE11) transmission in hollow core Bragg fibres is investigated theoretically by the transfer matrix method. The influences of core size and cladding parameters on the single HE11 mode bandwidth are analysed, showing that the maximal bandwidth is more sensitive to the core size than the cladding. The numerical results show that sufficiently broad bandwidth of single HE11 mode transmission can be achieved by proper fibre design. A simple and fast method based on improved hollow metal waveguide model is proposed to optimize fibre structure parameters for the maximal single HE11 mode bandwidth. 相似文献
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通过石英圆柱模型,理论研究了小芯径光子晶体光纤中混合声波模式的色散、模式耦合以及声光相互作用,理论计算出了布里渊散射增益系数谱的双峰结构及其随抽运光波长和温度的演化规律. 理论分析表明光子晶体光纤中布里渊散射增益系数谱的双峰结构源于小芯径光子晶体光纤中混合声波模式之间的模式耦合. 通过温度改变导致的材料参数变化对声波模式色散特性的影响,特别是声波模式耦合点的移动,解释了双峰结构随外界温度的变化规律. 并且,通过理论计算与实验结果的对比讨论了石英圆柱模型的局限性和适用范围.
关键词:
布里渊散射
声光相互作用
模式耦合
光子晶体光纤 相似文献
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