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Practical TV channel capacity of lightwave multichannel AM SCM systems limited by the threshold nonlinearity of laser diodes

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2 Author(s)
Ching, C.J. ; Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA ; Jacobs, F.

Experimental measurements of clipping-induced nonlinear distortion due to overmodulation of laser diodes in multichannel AM SCM (amplitude modulated subcarrier multiplexed) systems are shown to be in good agreement with recent theory and simulation results. These results are then used to show that the number of channels, consistent with CATV (cable television) distortion and noise requirements in the presence of threshold nonlinearity, relative intensity noise, and receiver thermal noise, are higher than previous estimates. The sensitivity of these results with respect to the carrier-to-noise ratio requirement and the received optical power at the photodetector is also discussed.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:4 ,  Issue: 3 )