Title :
A method for reducing the channel spacing in a coherent optical heterodyne system
Author :
O´Byrne, Vincent
Author_Institution :
GTE Lab. Inc., Boston, MA, USA
fDate :
7/1/1990 12:00:00 AM
Abstract :
A method of channel allocation for the reduction of the channel spacings in a heterodyne optical transmission system is proposed and analyzed for the specific case of frequency shift keying (FSK). This technique makes it possible to reduce the average optical interchannel spacing by an amount approximately equal to the intermediate frequency. This can increase the number of channels that can be accommodated within the generally limited continuous tuning range of commercial lasers employed as local oscillators by as much as 100% without the need for auxiliary equipment.<>
Keywords :
demodulation; frequency shift keying; laser tuning; optical modulation; FSK; channel allocation; channel spacing; channel spacing reduction; coherent optical heterodyne system; commercial lasers; frequency shift keying; intermediate frequency; laser tuning; limited continuous tuning range; local oscillators; optical interchannel spacing; Automatic frequency control; Channel spacing; Frequency shift keying; Laser tuning; Local oscillators; Optical filters; Optical mixing; Optical receivers; Optical transmitters; Optical tuning;
Journal_Title :
Photonics Technology Letters, IEEE
