Fiberoptic gas sensor is a novel sensor,a performance of methane sensor is analyzed and tested from the aspect of the fiber[CD*2]optic link loss,driving technology light source and output waveform of the phaselocked amplification circuit,methane absorption and etc in this paper.

This paper analyses and researches the solve method for optical link loss and optical divide ratio in star optical fiber networks,introduces the solve clue,method and steps by the examples for optical divide ratio of every optical distributor and for optical link loss of the entire network in complicated star optical fiber networks.

This paper analyses and studies the structure of star optical fiber transport network, reaches the algebraic relationship of optical link loss between single star optical fiber network and multiple star optical fiber network, and presents the calculation forma of optical divide ratio of optical distributors.

Method of link budget for WCDMA;

Research on EDGE system and wireless downlink budget

This paper firstly introduced WiMAX architecture, and then planning flows of mobile WiMAX wireless network were described in detail including propagation model calibra- tion and link budget.

And by analyzing their differences of link-budgets,the coverage radius of TD-SCDMA is better than that of WCDMA.

In particular,we simulate the UWB signal s link-budget in indoor environments according to the model proposed by IEEE.