Title :
20 channel coherent FSK system using subcarrier multiplexing
Author :
Gross, Richard ; Olshansky, Robert ; Hill, Paul
Author_Institution :
GTE Lab. Inc., Waltham, MA, USA
Abstract :
A 20-channel multioctave coherent frequency shift keying (FSK) system using subcarrier multiplexing techniques is described. The microwave subcarriers range from 2.1 to 5.9 GHz with a 200-MHz channel spacing. The receiver consists of a p-i-n photodiode, electrical isolator, low-noise amplifier, and bandpass filter to provide channel selection. The channels are modulated at 100 Mb/s, corresponding to one digitized video channel. Results for the optimal phase modulation index and degradation due to second- and third-order intermodulation distortion are discussed. For the worst-case channel, a receiver sensitivity of -27 dBm was achieved.<>
Keywords :
frequency shift keying; optical links; 100 Mbit/s; 2.1 to 5.9 GHz; bandpass filter; channel selection; channel spacing; degradation; digitized video channel; electrical isolator; low-noise amplifier; microwave subcarriers; multioctave coherent frequency shift keying system; optimal phase modulation index; p-i-n photodiode; receiver sensitivity; subcarrier multiplexing techniques; third-order intermodulation distortion; Band pass filters; Channel spacing; Degradation; Digital modulation; Frequency shift keying; Intermodulation distortion; Isolators; Low-noise amplifiers; PIN photodiodes; Phase modulation;
Journal_Title :
Photonics Technology Letters, IEEE
