in this paper, a new design of optical channel drop filter based on two- dimensional photonic crystal ring resonators with triangular lattice is proposed. the rods of this structure is silicon with the refractive index nsi=3.46 and the surrounding environment is air with the refractive index of nair=1.the widest photonic band gap obtains for the filling ratio of r/a = 0.2. the filter’s transmis...

This paper summaries and categories the information elements important for defining communication profiles of all relevant actors in a mobile communication scenario, where the information elements include Terminal, User, Service and Network Profiles. Those context information described by the profiles need to be retrieved before the decision process will be started for negotiation air interface...

-------------------------------------------------------------------ABSTRACT-----------------------------------------------------------------Optical device technologies for photonic networks, are focusing on integrated optical device technologies for digital coherent optical transmission technologies. With the rapid spread of fiber to the home (FTTH), broadband video services and mobile Internet...

Data communication services based on the widelyused high performance mobile devices have been sophisticated and diversified recently. These services require increasing the data rate and enhancing the capacity of optical transmission equipment in the network systems. One of the important functions of optical transmission equipment is to transform electrical data streams to optical data signals a...

Waveguides with low confinement loss, low chromatic dispersion, and low nonlinear effects are used in optical communication systems. Optical fibers can also be employed in such systems. Besides optical fibers, photonic crystal fibers are also highly suitable transmission media for optical communication systems. In this paper, we introduce two new designs of index-guiding photonic crystal fiber ...

A R TI CL E Abstract The outstanding phase-noise performance of optical frequency combs has led to a revolution in optical synthesis and metrology, covering a myriad of applications, from molecular spectroscopy to laser ranging and optical communications. However, the ideal characteristics of an optical frequency comb are application dependent. In this review, the different techniques for the g...

The communication needs of Earth observation satellites is steadily increasing. Within a few years, the data rate of such satellites will exceed 1 Gbps, the angular resolution of sensors will be less than 1 μrad, and the memory size of onboard data recorders will be beyond 1 Tbytes. Compared to radio frequency links, optical communications in space offer various advantages such as smaller and l...