Title :
Coherent transmission of 60 FM-SCM video channels
Author :
Gross, R. ; Schmidt, M. ; Olshansky, R. ; Lanzisera, V.
Author_Institution :
GTE Lab. Inc., Waltham, MA, USA
fDate :
4/1/1990 12:00:00 AM
Abstract :
A fiber-optic 60-channel FM video system using coherent subcarrier multiplexing (SCM) is described. Two receiver implementations were studied. For the 60-channel coherent experiment, a carrier-to-noise ratio of 17 dB and a corresponding signal-to-noise ratio of 56 db was achieved with a detected optical power of -32 dBm and a phase modulation index of beta -0.07. This represents a 15.2-dB improvement over a similar 60-channel direct-detection FM-SCM system and a 5.6 dB improvement compared to the performance of the system when a semiconductor optical preamplifier was used.<>
Keywords :
cable television; multiplexing; optical fibres; optical links; 17 dB; 56 dB; carrier-to-noise ratio; coherent subcarrier multiplexing; coherent transmission; detected optical power; fiber-optic 60-channel FM video system; phase modulation index; receiver implementations; signal-to-noise ratio; Circuits; Frequency modulation; Laser tuning; Optical mixing; Optical noise; Optical receivers; Optical sensors; Optical transmitters; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
