In the IPTV systems, multicasting will play a crucial role in the delivery of high-quality video services, which can significantly improve bandwidth efficiency. However, the scalab.lity and the signal quality of curre...
详细信息
ISBN:
(纸本)9780819469472
In the IPTV systems, multicasting will play a crucial role in the delivery of high-quality video services, which can significantly improve bandwidth efficiency. However, the scalab.lity and the signal quality of current IPTV can barely compete with the existing broadcast digital TV systems since it is difficult to implement large-scale multicasting with end-to-end guaranteed quality of service (QoS) in packet-switched IP network. China 3TNet project aimed to build a high performance broadband trial network to support large-scale concurrent streaming media and interactive multimedia services. The innovative idea of 3TNet is that an automatic switched opticalnetworks (ASON) with the capability of dynamic point-to-multipoint (P2MP) connections replaces the conventional IP multicasting network in the transport core, while the edge remains an IP multicasting network. In this paper, we will introduce the network architecture and discuss challenges in such IP over optical multicasting for video delivery.
We propose a new method about optically pumped cesium beam clock. Due to the magnetic field of selecting magnet, the pumping light and detection light use the same frequency laser which makes system structure simpler....
详细信息
The electrodeless discharge rubidium vapor lamp plays a key role in a number of applications, such as atomic clock, atomic magnetometer, atomic optical filter and laser frequency stabilization. The electrodeless disch...
详细信息
The electrodeless discharge rubidium vapor lamp plays a key role in a number of applications, such as atomic clock, atomic magnetometer, atomic optical filter and laser frequency stabilization. The electrodeless discharge Rb vapor lamp has rich spectra, including 420nm, 421nm, 565nm, 572nm, 607nm, 616nm, 728 nm, 776 nm, 780 nm, 795 nm, 1324 nm, 1344 nm, 1366 nm, 1475 nm, 1529 nm spectroscopy, etc. The 780nm transition wavelength between 5P3/2 and 5S1/2 of Rb atoms is usually used in fields of the Rb atomic clock and the Rb atomic *** the 421.7 nm laser pumping atoms from 5S1/2 to 6P1/2, 1366.9 nm transition from 6S1/2 to 5P3/2 can be used as a clock transition of Rb four levels for an atomic active optical clock. An active optical clock is a new conception of the atomic clock and has the potential to improve the stabil- ity of the best atomic clocks by about two orders of magnitude. Another application of the elec- trodeless discharge Rb vapor lamp is the Rb Faraday anomalous-dispersion optical filter （FADOF） （e.g., 776 nm] and 1529 nm spectroscopy）, in which the electrodeless discharge Rb vapor lamp is more feasible than the one using a laser pumped Rb vapor cell in some cases, since many excited states are populated enough for aimed FADOF transition. Although the rich spectra of Rb have many applications, so far no detailed investigations or applications have been achieved in 728.0nm transition. To the best of our knowledge, the Rb 728.0 nm spectral data are currently only from the fluorescence by Beacham arc spectrum of rubidium early in 1959.
We present a 657-nm external cavity diode laser （ECDL） system, where the output frequency is stabilized by a narrow-band high transmission interference filter. This novel diode laser system emits laser with an insta...
详细信息
We present a 657-nm external cavity diode laser （ECDL） system, where the output frequency is stabilized by a narrow-band high transmission interference filter. This novel diode laser system emits laser with an instantaneous linewidth of 7 kHz and a broadened linewidth of 432 kHz.
In Geographic Information system (GIS), fast and efficiently indexing moving objects are a crucial issue in several application domains, such as LBS, Intelligence Transportation and Digital Battle. In this paper, a ne...
详细信息
We propose a novel flexible traffic-aware OXC architecture for hybrid WDM and elastic opticalnetwork. The simulation results show that the proposed OXC can save CAPEX significantly while providing similar blocking pe...
详细信息
We report G-TEP which includes a GMPLS tester of highly dynamic GMPLS networks, and an emulated GMPLS network with up to 200 nodes targeted at future nation-wide deployment of ASON in China.
ISBN:
(纸本)0978921704
We report G-TEP which includes a GMPLS tester of highly dynamic GMPLS networks, and an emulated GMPLS network with up to 200 nodes targeted at future nation-wide deployment of ASON in China.
In this paper, a shared sub-path protection mechanism for multi-domain opticalnetworks is proposed. It divides the computed working path into several working sub-paths which span two domains. For each working sub-pat...
详细信息
ISBN:
(纸本)0978921739
In this paper, a shared sub-path protection mechanism for multi-domain opticalnetworks is proposed. It divides the computed working path into several working sub-paths which span two domains. For each working sub-path, two intra-domain and an inter-domain backup sub-paths are computed to protect intra-domain and inter-domain failures. Simulation results show it has shorter failure recovery time and is resource efficient.
Interleaved frequency division multiple access (IFDMA) for upstream transmission of next-generation passive opticalnetwork is experimentally demonstrated. The scheme has low PAPR and low computation complexity for ON...
详细信息
暂无评论