Current Issue : July - September Volume : 2018 Issue Number : 3 Articles : 6 Articles
Currently it is not possible to create a fully optical communication system without a software tool which simulates an optical\ncommunication line in real conditions prior to its construction. The aim of this article is to establish a comparison between the\nEDFA (erbium doped fibre amplifier) and SOA (semiconductor optical amplifier) optical amplifiers in the WDM (wavelength\ndivision multiplexing) system. The system contains a four-channel WDM with speed of 10 Gbps and optical fibre with length of\n80 km. Simulations are conducted in the programme environment ââ?¬Å?OptSim.ââ?¬Â The quality of the optical communication system is\nevaluated by the BER (bit error rate) and ...
We report on a continuous-wave (CW) and passively Q-switched Er:Y2O3 ceramic laser in mid-infrared spectral region. In the CW\nregime, a maximum output power of 2.07W is achieved at 2717.3 nm with a slope efficiency of 13.5%. Stable passive Q-switching\nof the Er:Y2O3 ceramic laser is demonstrated based on semiconductor saturable absorber mirror. Under an absorbed pump power\nof 12.4W, a maximum average output power of 223mW is generated with a pulse energy of 1.7...
Thermal effects are the main obstacle to getting high power and good beam quality in diode end-pumped solid-state lasers. In\nthis work, a theoretical investigation of thermal effects in single and dual end-pumped solid-state lasers is carried out using finite\nelement analysis (FEA) for a selected number of widely used laser producing materials, namely, Nd:YAG, Yb:YAG, and Nd:KGW.\nCrystals with different dimensions are also investigated both in single and in dual end-pumped configuration. Finally, the effect of\nusing composite crystals on thermal lensing is investigated. An experiment to measure the thermal focal length for two different\ncrystals was carried out and a comparison with FEA computed focal length of the thermal lens is made. In all cases studied in this\nwork, results show clear effects of thermal lensing with some differences depending on crystal type, pump power, and size....
Initiated by a task in tunable microoptics, but not limited to this application, a microfluidic droplet array in an upright standing\nmodule with 3 Ã?â?? 3 subcells and droplet actuation via electrowetting is presented. Each subcell is filled with a single (of course\ntransparent) water droplet, serving as amovable iris, surrounded by opaque blackened decane. Each subcellmeasures 1 Ã?â??1mm2 and\nincorporates 2 Ã?â?? 2 quadratically arranged positions for the droplet. All 3 Ã?â?? 3 droplets are actuated synchronously by electrowetting\non dielectric (EWOD). The droplet speed is up to 12 mm/s at 130V (...
3 at.% Tm, ...
Based on light transfermatrix and electric field vector equation, the evolution ofAiry beampropagating in periodic slab system with\nthree negative index materials (NIMs) and its transmission mechanism are investigated. The intensity profiles on emergent surface\nof periodic slab system and side view of Airy beampropagating in each right handed material (RHM) and double negativematerial\n(DNM) unit including lossless and losses DNMs are discussed. It is revealed that the self-recovery Airy beam can be achieved in\nlong distance by using lossless periodic slab system as long as the negative refractive index ...
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