From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

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 3547/CH3/EX3.9/Ex3_9.sce | 26 ++++++++++++++++++++++++++
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 create mode 100644 3547/CH3/EX3.9/Ex3_9.sce

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diff --git a/3547/CH3/EX3.9/Ex3_9.sce b/3547/CH3/EX3.9/Ex3_9.sce
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+// Example no.3.9
+// To calculate a) the frequency separation between modes (b) the wavelength separation between modes
+// Page no.133
+
+clc;
+clear;
+
+// Given data
+lambda=1.3*10^-6;                                            // Laser diode operating wavelength
+L=300*10^-6;                                                 // Cavity length
+n=3.5;                                                       // Refractive index of active region
+c=3*10^8;                                                    // Speed of ligth in air (m/s)
+
+// a)The frequency separation between modes
+deltaf=c/(2*n*L);                                           // The frequency separation between modes in GHz
+
+// Displaying the result in command window
+printf('\n The frequency separation between modes =  %0.1f GHz',deltaf*10^-9);
+
+// (b)The wavelength separation between modes
+deltalambda=(lambda^2*deltaf)/c;                           // The wavelength separation between modes
+
+// Displaying the result in command window
+printf('\n The wavelength separation between modes = %0.1f nanometer',deltalambda*10^9);
+
+// The wrong unit is givan in book
-- 
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