The principle and charecteristics of verious digital optical signal amplifiers using Er doped fiber optical bistability devices have been discussed. Optical signal gain and its variation with the parameters of the de...The principle and charecteristics of verious digital optical signal amplifiers using Er doped fiber optical bistability devices have been discussed. Optical signal gain and its variation with the parameters of the devices with constant or pulse optical bias have been calculated, and the design principle of those devices has been given.展开更多
It is proposed that an optical fiber grating bistability device may be used for an all optical switching or an all optical digital signal amplifier with low power and high speed. The principle, characteristic and pa...It is proposed that an optical fiber grating bistability device may be used for an all optical switching or an all optical digital signal amplifier with low power and high speed. The principle, characteristic and paremeter are analysed, and some design ideas are given.展开更多
A hybrid fiber optical bistable device with electrical feedback has been proposed and analyzed.Bistability operation and some applications for optical signal processing have been realized experimentally .
It is proposed that a segment of Er doped fiber with a couple of fiber gratings on the ends may be used as a novel optical bistability device with low power and high speed. Operation and bistability threshold of devi...It is proposed that a segment of Er doped fiber with a couple of fiber gratings on the ends may be used as a novel optical bistability device with low power and high speed. Operation and bistability threshold of device are analysed in accordance with the distributed feedback couple mode theory and the nonlinear characteristic of Er doped fiber. It is shown that a nanoseconds microwatts bistable operation of a centimeter device is realizable under nowaday technological condition.展开更多
文摘目的探讨甲状旁腺素联合降钙素对大鼠骨质疏松的影响及其作用机制,为临床治疗提供理论依据。方法 100只雌性SD大鼠随机分为5组:假手术组、去势组、甲状旁腺素组、降钙素组、联合用药组,每组20只,构建去卵巢大鼠骨质疏松动物模型。骨组织骨密度(bone mineral density,BMD)和骨矿物质含量(bone mineral content,BMC)测定,血清E2检测,骨代谢相关生化指标和标志物检测,观察骨形态结构变化。结果去势组较假手术组腰椎和股骨BMD和BMC、股骨最大负荷及血清E2、Ca、P、骨保护素水平均显著降低(P<0. 05),而联合用药组上述指标较去势组均显著增高(P<0. 05)。去势组血清碱性磷酸酶、OC、RANK水平较假手术组均显著升高(P<0. 05),而联合用药组上述指标较去势组均显著降低(P<0. 05)。去势组骨小梁明显减少,排列稀疏错乱,并出现大片断裂现象,大量纤维组织,骨细胞少见;联合用药组骨小梁较多且致密,形态结构较规整,骨细胞排列较整齐,骨连续性好,骨密质较厚且均匀。结论甲状旁腺素联合降钙素通过提高雌激素水平,调节维持骨代谢,提高骨密度和矿物含量,改善生物力学性能,改善骨组织病理形态学,起到抗骨质疏松疗效和骨保护作用。
文摘The principle and charecteristics of verious digital optical signal amplifiers using Er doped fiber optical bistability devices have been discussed. Optical signal gain and its variation with the parameters of the devices with constant or pulse optical bias have been calculated, and the design principle of those devices has been given.
文摘It is proposed that an optical fiber grating bistability device may be used for an all optical switching or an all optical digital signal amplifier with low power and high speed. The principle, characteristic and paremeter are analysed, and some design ideas are given.
文摘A hybrid fiber optical bistable device with electrical feedback has been proposed and analyzed.Bistability operation and some applications for optical signal processing have been realized experimentally .
文摘It is proposed that a segment of Er doped fiber with a couple of fiber gratings on the ends may be used as a novel optical bistability device with low power and high speed. Operation and bistability threshold of device are analysed in accordance with the distributed feedback couple mode theory and the nonlinear characteristic of Er doped fiber. It is shown that a nanoseconds microwatts bistable operation of a centimeter device is realizable under nowaday technological condition.
