Performance Analyses of Dense Wavelength Division Multiplexing in Ring Metropolitan Area Networks With and Without Erbium Doped Fibre Amplifier
This Paper investigates the performance of dense wa v length division multiplexing ring networks implemnted in the metropolitan areas for the purpose of deploy ing higher bit rates. The investigations were carri ed out in the Cband operating region by deploying four channels over a single standard mode fibre with channel spacing of 100GHz at 10Gbps. Transmissions of 108km and 7km with and without Erb ium Doped Fibre Amplifier (EDFA) were achieved with a 10 fixed value of Bit Error Rate (BER). The performanc e was measured through a bit rate analyser using an eye diagram.
Novel Optical Flat-Gain Hybrid Amplifier for Dense Wavelength Division Multiplexed System
For the first time, a novel flat-gain optical amplifier is proposed using a hybrid configuration with an Er-Yb co-doped waveguide amplifier (EYDWA) and a semiconductor optical amplifier (SOA) for 100 × 10-Gb/s dense wavelength division multiplexed system at 0.2 nm interval. With an EYDWA-SOA hybrid amplifier, a flat gain of is obtained across the effective bandwidth with a gain variation of the order of 0.75 dB without using any gain clamping techniques. It is observed that when the proposed hybrid amplifier is used as a booster for hybrid distributed Raman amplifier and erbium doped fiber amplifier, the gain variation is reduced from 2.01 to ~ 1.15 dB efficiently with acceptable bit error rate.
Research on velocity distribution in semi-dry flue gas desulfurization tower
As an accurate high-quality instantaneous measurement technology, particle image velocimetry (PIV in acronym) has applied widely in single-phase flow and multiphase flow. The velocity distribution in semi-dry FGD tower directly influences gas-solid mix and contact situation. In base of the tower, gas-solid two-phase flow field is more complex, and has the quite tremendous influence to the overall system desulphurization efficiency. This paper utilized PIV to study velocity distribution in Semi-dry flue gas desulfurization tower and obtained velocity distribution.