Hybrid SCM optical transmission apparatus

Details Hybrid SCM optical transmission apparatus Hybrid SCM optical transmission apparatus

1995-11-09

1997-10-21

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359125, 359181, 359187, H04J 1402

Patent

active

056802382

ABSTRACT:
In a hybrid SCM optical transmission apparatus, and particularly in a hybrid SCM optical transmission apparatus which performs transmission by modulating laser light by a hybrid signal formed by frequency multiplexing an analog-modulated signal with a digitally modulated signal to form a hybrid AM-QAM signal, for the purpose of both effective utilization of transmission bandwidth and reduction of clipping deterioration, a signal limiting section which applies limiting to the analog-modulated signal is provided, frequency-division multiplexing being done of analog-modulated signal output from this signal limiting section and a digitally modulated signal. In place of this signal limiting section, a signal limiting section which applies limiting to the hybrid signal, or a delay circuit which delays the hybrid signal by a prescribed amount of time and a clipping compensation section which generates a clipping compensation signal which inhibits the clipping of laser light output by means of a predicted clipping strength which is detected from the hybrid signal during the delay period are used. These are appropriately feedback controlled, in accordance with monitoring of the laser light output.

REFERENCES:
patent: 4722081 (1988-01-01), Fujito et al.
patent: 4893300 (1990-01-01), Carlin et al.
patent: 5134509 (1992-07-01), Olshansky et al.
patent: 5351148 (1994-09-01), Maeda et al.

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