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+//clear//

+//Caption: Calculation of Number stations for given loss

+//Example13.2

+//page 465

+clear;

+clc;

+close;

+alpha = 0.4; //attenuation in dB/Km

+L_tap = 10; // coupling loss in dB

+L_thru = 0.9; // coupler throughput in dB

+Li = 0.5; //Intrinsic coupler loss in dB

+Lc = 1.0; // coupler-to-fiber loss in dB

+L = 0.5;  //link length in Km

+Pbudget_LED = 38; // power loss between source and receiver in dB for LED source

+Pbudget_LASER = 51;//power loss between source and receiver in dB for LASER source

+N_LED = (Pbudget_LED+alpha*L-2*L_thru-2*L_tap)/(alpha*L+2*Lc+Li+L_thru)

+N_LASER = (Pbudget_LASER+alpha*L-2*L_thru-2*L_tap)/(alpha*L+2*Lc+Li+L_thru)

+disp(ceil(N_LED),'Number of stations allowed for given loss of 38 dB with LED source')

+disp(floor(N_LASER),'Number of stations allowed for given loss of 51 dB with LASER source')

+//Result

+//Number of stations allowed for given loss of 38 dB with LED source   

+//     5.  

+//Number of stations allowed for given loss of 51 dB with LASER source   

+//    8.