00323nam a2200121Ia 4500008004100000041000800041082001200049100001500061245003300076250001400109260005000123650002800173230711s9999||||xx |||||||||||||| ||und||  aENG  a4bGO-O  aGowar,John 0aOptical communication system  a2nd . Ed.  c2002aNew DelhibPHI Learning Private Limited  aElectronics Engineering