Linearized optical transmitter

Details Linearized optical transmitter Linearized optical transmitter

1996-08-07

1998-09-22

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359180, 375296, H04B 1000

Patent

active

058122940

ABSTRACT:
A linearized optical transmitter in which predistortion is employed to cancel both third and fifth order intermodulation distortion includes a modulated optical source responsive to a time varying electrical input signal to supply a time varying optical output signal containing multiple subcarrier signals. The modulated optical source is characterized by a non-linear transfer function such that intermodulation of the multiple subcarrier signals occurs, and for this reason, the optical transmitter further includes a predistortion circuit for supplying a predistorted signal comprising both the multiple subcarrier signals and intermodulation products substantially equal in magnitude and opposite in phase to those associated with the non-linear transfer function such that odd-order subcarrier intermodulation distortion products in the optical output signal are substantially canceled through the fifth order.

REFERENCES:
patent: 5361156 (1994-11-01), Pidgeon
patent: 5373384 (1994-12-01), Hebert
patent: 5436749 (1995-07-01), Pidgeon, Jr. et al.
patent: 5453868 (1995-09-01), Blauvelt et al.
"Progress in Externally Modulated AM CATV Transmission Systems", M. Nazarathy et al,J. Lightwave Technology., vol. 11, pp. 82-104 (1993).

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