Title :
Second-order IMD cancellation receiver for wideband coherent SCM systems
Author :
Gross, Richard ; Olshansky, Robert
Author_Institution :
GTE Lab., Waltham, MA, USA
Abstract :
A novel receiver design for coherent subcarrier multiplexed (SCM) systems is demonstrated with a 20-channel digital video system in a multioctave configuration. System performance is enhanced by cancelling second-order intermodulation distortion and detecting both sidebands containing the microwave information. A multioctave 20-channel heterodyne SCM differential quadrature phase shift keying (DQPSK) experiment demonstrated the technique, achieving a receiver sensitivity of -40 dBm, which represents a 12 dB gain over the standard receiver design for this system configuration.<>
Keywords :
intermodulation; multiplexing; optical links; optical modulation; phase shift keying; receivers; sensitivity; video signals; 20-channel digital video system; DQPSK; coherent subcarrier multiplexed; differential quadrature phase shift keying; intermodulation distortion cancellation; microwave information; multioctave configuration; receiver design; second-order intermodulation distortion; sensitivity; sidebands; wideband coherent SCM systems; Intermodulation distortion; Nonlinear optics; Optical distortion; Optical mixing; Optical receivers; Optical sensors; Phase modulation; Phase noise; Photoconductivity; Wideband;
Journal_Title :
Photonics Technology Letters, IEEE
