نتایج جستجو برای: wdm
تعداد نتایج: 3684 فیلتر نتایج به سال:
We propose a super-channel flexible wavelength division multiplexing (WDM) receiver architecture. The receiver, which requires no optical filtering, only a pair (I and Q phases) of coherent optical detectors, and an electrical receiver system, can simultaneously recover multiple wavelength-multiplexed channels using cascaded optical and electrical down-conversion. The receiver data capacity inc...
For building an optical access network, we propose some new hybrid WDM/TDM passive optical network (PON) architectures that use wavelength selective switches (WSSs) at the remote node to improve flexibility, data security and power budget. Through simulations we demonstrate that the switching capabilities of a WSS can provide additional gains in terms of wavelength usage by a better statistical...
We propose the network on demand concept to yield the optical access network system that well handles the diversity in user demands and support technologies such as module and devices configuration. In this proposal, the network accommodation equipment, such as OLT needed for each service, is installed ‘virtually’ using WDM, and the physical rate can adapt to the user-demanded service rate by u...
This paper examines two methods of multiple access for optical networks: code-division and wavelength division. Two approaches are given for analyzing code-division systems, and an overview of a proposal for a WDM network will be summarized. Since the maturity of the technologies necessary for such systems diier, the usefulness of a direct comparison between CDMA and WDM is limited; instead, th...
In current WDM networks, it is possible to support hundreds of WDM channels on a single fiber. Therefore, the cost of the transmitters and the receivers, and hence the number of light paths, is becoming the main factor in determining the cost of a WDM network. Researchers tried to keep the number of light paths required to implement a topology as low as possible. This paper presents a restorabl...
A novel survivable IP over WDM network design problem is proposed. The IP network uses lightpath services of the WDM network to implement its IP links. The WDM network can provide unprotected and protected lightpaths, as well as a new lightpath service referred to as survivable pair. The IP network must support two traffic matrices, one under normal conditions and the other whenever there is a ...
This disquisition presents a energy consumption in a network which is a important physical factor against this everlasting increase in network traffic. Since current equipment in network consumes energy inefficiently due to poor energy load proportionality we have modeled a packet optical transport networks. By employing integer linear programming (ILP), we model and optimize the energy consump...
از جمله مسائلی که در wdm مطرح می شود مسائله نگاشت می باشد، نگاشت بدین معناست که چگونه بتوانیم برای تامین خواسته های خود با آنچه در اختیار داریم بهترین راه را انتخاب کنیم. بواسطه این که wdm قادر است از پهنای باند بالای فیبر نوری حداکثر استفاده را ببرد از آن بیشتر در توپولوژی مش استفاده می شود. توپولوژی مش و انتقال چندین طول موج از یک فیبر در wdm به شدت متاثر از اتفاقاتی نظیر قطع فیبر نوری و اختل...
Lyman-$\alpha$ forest data are known to be a good probe of the small scale matter power. In this paper, we explore redshift evolution observable effective optical depth $\tau_{\rm eff} (z)$ from as discriminator between dark models that differ $\Lambda$CDM model on scales. We consider thermal warm (WDM) and ultra-light axion (ULA) for following set parameters: mass ULA, $m_a \simeq 10^{-24}\hbo...
ABSTRACT We study the evolving environment dependence of mass accretion by dark haloes in simulations cold and warm matter (CDM WDM) cosmologies. The latter allows us to probe nature halo growth at scales below WDM half-mode mass, which form an extreme regime non-linear collisionless dynamics offer excellent test-bed for ideas relating hierarchical growth. As environmental proxies, we use local...
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