Title :
Multichannel coherent FSK experiments using subcarrier multiplexing techniques
Author :
Gross, Richard ; Olshansky, Robert
Author_Institution :
GTE Lab. Inc., Waltham, MA, USA
fDate :
3/1/1990 12:00:00 AM
Abstract :
The results for coherent digital subcarrier multiplexed (SCM) lightwave system experiments are described. A total of 20 frequency-shift-keyed (FSK) channels at 100 Mb/s each were transmitted on one optical carrier using microwave subcarriers in a multioctave configuration. A complete description of the system performance, including carrier-to-noise ratio, crosstalk, intermodulation distortion, and receiver sensitivity, is given. With a phase modulation index of β=0.13, a receiver sensitivity of -27 dBm was obtained, representing a 14-dB improvement over a 20-channel direct detection SCM system. Crosstalk due to adjacent channels is negligible with a channel spacing of twice the data rate (200 MHz). Theoretical and experimental results are compared, and conditions for optimal performance as a function of channel number and phase modulation index are discussed
Keywords :
crosstalk; frequency shift keying; light coherence; multiplexing; optical modulation; phase modulation; 100 Mbit/s; 200 MHz; FSK; carrier-to-noise ratio; channel spacing; coherent FSK experiments; coherent digital subcarrier multiplexed; crosstalk; data rate; frequency-shift-keyed; intermodulation distortion; lightwave system experiments; microwave subcarriers; multichannel light-wave experiments; multioctave configuration; one optical carrier; phase modulation index; receiver sensitivity; subcarrier multiplexing techniques; Frequency shift keying; Intermodulation distortion; Optical crosstalk; Optical distortion; Optical modulation; Optical receivers; Optical sensors; Phase detection; Phase modulation; System performance;
Journal_Title :
Lightwave Technology, Journal of
