Title :
Power spectra of FSK modulated laser fields
Author :
Tjhung, T.T. ; Chew, Y.H. ; Mendis, F.V.C.
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore
fDate :
10/26/1995 12:00:00 AM
Abstract :
In a continuous phase frequency shift keying (CPFSK) coherent optical communication system, the optical signal is usually generated by modulating the bias current of a singlemode laser diode. This generation process is always accompanied by a simultaneous intensity modulation (IM) of the emitted light. The authors derive an exact expression for the power spectra of the optical CPFSK signal, taking this simultaneous IM effect into account. From the derived formula, The asymmetrical shape of the power spectra observed earlier by other investigators is shown and explained
Keywords :
frequency shift keying; laser beam applications; optical communication; optical modulation; FSK modulated laser fields; asymmetrical shape; bias current modulation; coherent optical communication; continuous phase frequency shift keying; optical CPFSK signal; power spectra; simultaneous intensity modulation; singlemode laser diode;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19951340
